feat: use AI to migrate calendar and event views

- migrate old API into typescript but not finished (only webLogin works now)
- seperate the logger of backend due to the shitty behavior of Flask (change logging level)

ROADMAP.md

@@ -0,0 +1,10 @@
+# Roadmap
+
+1. 前后端分离，将前端静态文件和后端Python分装到两个文件夹中。同时辅助类文件夹改换位置。
+1. 后端使用Astral UV重构，使得项目可以跑起来。
+1. 定为1.1版本。1.0版本也要打tag然后提交。然后分叉v1-maintain分支。后续在master上开发v2。
+1. 后端数据库字段重命名。
+1. 前后端通信API命名格式修改。
+1. 使用Vue重写前端
+1. 使用Tailwind重写前端CSS
+1. 使用Go重写后端。

assets/.nginx.conf

@@ -0,0 +1,61 @@
+# ============================
+# 路由 1: /web -> 静态文件
+# ============================
+location /web {
+	# 使用 alias 精确映射
+	# 请求 /web/index.html -> /var/www/static/index.html
+	alias /var/www/static;
+	
+	# 静态文件优化
+	expires 7d;
+	add_header Cache-Control "public, max-age=604800";
+	
+	# 尝试返回文件，不存在则返回404（避免落入其他location）
+	try_files $uri $uri/ =404;
+	
+	# 可选：启用 gzip 压缩
+	gzip_static on;
+}
+
+# ============================
+# 路由 2: /api -> Go 程序 (8848端口)
+# ============================
+location /api {
+	# 反向代理到本地 Go 服务
+	proxy_pass http://127.0.0.1:8848;
+	
+	# 重要：保留原始请求头
+	proxy_set_header Host $host;
+	proxy_set_header X-Real-IP $remote_addr;
+	proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;
+	proxy_set_header X-Forwarded-Proto $scheme;
+	
+	# WebSocket 支持（如果 Go 程序需要）
+	# proxy_http_version 1.1;
+	# proxy_set_header Upgrade $http_upgrade;
+	# proxy_set_header Connection "upgrade";
+	
+	# 超时设置（根据业务调整）
+	proxy_connect_timeout 60s;
+	proxy_send_timeout 60s;
+	proxy_read_timeout 60s;
+	
+	# 缓冲设置（可选，大文件上传时注意调整）
+	proxy_buffering on;
+	proxy_buffer_size 4k;
+	proxy_buffers 8 4k;
+}
+
+# ============================
+# 可选：根路径处理
+# ============================
+location = / {
+	# 重定向到 /web
+	return 302 /web/;
+}
+
+# 禁止访问隐藏文件
+location ~ /\. {
+	deny all;
+	return 404;
+}

assets/ics2csv.py

@@ -0,0 +1,101 @@
+import icalendar
+
+def DumpComponentHeader(file, component):
+    fields = []
+    inclusiveUnitCounter = 0
+    fields += map(lambda x: x + ' - required', component.required)
+    fields += map(lambda x: x + ' - singletons', component.singletons)
+    for units in component.inclusive:
+        fields += map(lambda x: x + ' - inclusive{}'.format(inclusiveUnitCounter), units)
+        inclusiveUnitCounter += 1
+    fields += ('exclusive - name', 'exclusive - data')
+    fields += ('multiple', )
+    file.write(','.join(fields))
+    file.write('\n')
+
+def DumpComponentData(file, component):
+    data = []
+    gotten_instance = None
+
+    for item in component.required:
+        gotten_instance = component.get(item)
+        if gotten_instance is not None:
+            data.append(AdvancedFormater(gotten_instance))
+        else:
+            data.append('')
+    for item in component.singletons:
+        gotten_instance = component.get(item)
+        if gotten_instance is not None:
+            data.append(AdvancedFormater(gotten_instance))
+        else:
+            data.append('')
+    for units in component.inclusive:
+        for item in units:
+            gotten_instance = component.get(item)
+            if gotten_instance is not None:
+                data.append(AdvancedFormater(gotten_instance))
+            else:
+                data.append('')
+
+    gotten_name = ""
+    gotten_data = ""
+    for item in component.exclusive:
+        gotten_instance = component.get(item)
+        if gotten_instance is not None:
+            gotten_name = item
+            gotten_data = AdvancedFormater(gotten_instance)
+            break
+    data.append(gotten_name)
+    data.append(gotten_data)
+
+    for item in component.multiple:
+        gotten_instance = component.get(item)
+        if gotten_instance is not None:
+            data.append('- {} -'.format(item))
+            data.append(AdvancedFormater(gotten_instance))
+        else:
+            data.append('')
+
+    file.write(','.join(data))
+    file.write('\n')
+
+def AdvancedFormater(data):
+    if isinstance(data, icalendar.prop.vDDDTypes):
+        return str(data.dt)
+    else:
+        return str(data)
+
+# read file
+icsFile = open('test.ics', 'rb')
+cal = icalendar.Calendar.from_ical(icsFile.read())
+icsFile.close()
+
+# analyse file
+csvEvent = open('event.csv', 'w')
+csvEventHeader = False
+csvAlarm = open('alarm.csv', 'w')
+csvAlarmHeader = False
+
+eventCount = 0
+alarmCount = 0
+miscCount = 0
+for component in cal.walk():
+    if component.name == 'VEVENT':
+        eventCount += 1
+        if not csvEventHeader:
+            DumpComponentHeader(csvEvent, component)
+            csvEventHeader = True
+        DumpComponentData(csvEvent, component)
+    elif component.name == 'VALARM':
+        alarmCount += 1
+        if not csvAlarmHeader:
+            DumpComponentHeader(csvAlarm, component)
+            csvAlarmHeader = True
+        DumpComponentData(csvAlarm, component)
+    else:
+        miscCount += 1
+    
+        
+csvEvent.close()
+csvAlarm.close()
+print('Event count: {}\nAlarm count: {}\nMisc count: {}'.format(eventCount, alarmCount, miscCount))

assets/ics_converter.py

@@ -0,0 +1,156 @@
+import icalendar
+import sys
+import os
+import database
+import json
+import datetime
+import dt as localdt
+
+def AdvancedDatetTimeGet(dt, isStartDateTime):
+    if isinstance(dt, datetime.datetime):
+        gottenDatetime = int(dt.timestamp() / 60)
+    elif isinstance(dt, datetime.date):
+        gottenDatetime = int(datetime.datetime(
+            dt.year,
+            dt.month,
+            dt.day,
+            0 if isStartDateTime else 23, 
+            0 if isStartDateTime else 59,
+            0 if isStartDateTime else 59,
+            0, tzinfo=LOCAL_TZ
+        ).timestamp() / 60)
+    else:
+        raise Exception('Unexpected data')
+
+    timezoneOffset = LOCAL_UTC_OFFSET
+    return (gottenDatetime, timezoneOffset)
+
+def AdvancedDateTimeAnalyser(component):
+    startDatetimeRef = component.get('DTSTART').dt
+    (startDatetime, timezoneOffset) = AdvancedDatetTimeGet(startDatetimeRef, True)
+
+    if component.get('DTEND') is not None:
+        (endDatetime, _) = AdvancedDatetTimeGet(startDatetimeRef, False)
+    elif component.get('DURATION') is not None:
+        endDurationRef = component.get('DURATION').dt
+        if isinstance(endDurationRef, datetime.timedelta):
+            endDatetime = startDatetime + int(endDurationRef.total_seconds() / 60)
+        else:
+            raise Exception('Unexpected data')
+    else:
+        raise Exception('Unexpected data')
+
+    return (startDatetime, endDatetime, timezoneOffset)
+
+def LoopRulesConverter(component):
+    jsonData = component.get('RRULE')
+    if jsonData is None:
+        return ""
+
+    loopRules = ""
+    loopStopRules = ""
+    freq = jsonData.get('FREQ')[0]
+    if freq == 'MONTHLY':
+        loopRules = 'MSA{}'.format(str(jsonData.get('INTERVAL')[0]))
+    elif freq == 'WEEKLY':
+        occupiedWeek = [False, ] * 7
+        for item in jsonData.get('BYDAY'):
+            occupiedWeek[WEEK_DICT[item]] = True
+        loopRules = 'W{}{}'.format(
+            ''.join(map(lambda x: 'T' if x else 'F', occupiedWeek)),
+            str(jsonData.get('INTERVAL')[0])
+        )
+    elif freq == 'YEARLY':
+        loopRules = 'YS{}'.format(str(jsonData.get('INTERVAL')[0]))
+    else:
+        raise Exception('Unexpected data')
+
+    if jsonData.get('COUNT') is not None:
+        loopStopRules = 'T{}'.format(str(jsonData.get('COUNT')[0]))
+    else:
+        loopStopRules = 'F'
+
+    return loopRules + '-' + loopStopRules
+
+# ============================ read args
+icsFilePath = sys.argv[1]
+if not os.path.isfile(icsFilePath):
+    print('Fail to load ics file')
+    sys.exit(1)
+
+# read file
+icsFile = open(icsFilePath, 'rb')
+cal = icalendar.Calendar.from_ical(icsFile.read())
+icsFile.close()
+
+#  ============================ init const
+utfOffset = float(input('Input this ics file\'s utc offset (time unit: hour)>'))
+LOCAL_UTC_OFFSET = int(utfOffset * 60)
+LOCAL_TZ = localdt.UTCTimezone(LOCAL_UTC_OFFSET)
+WEEK_DICT = {
+    "SU": 6, "MO": 0, "TU": 1, "WE": 2, "TH": 3, "FR": 4, "SA": 5,
+}
+
+# ============================ pick database
+
+db = database.CalendarDatabase()
+db.open()
+username = input('Input username >')
+password = input('Input password >')
+(status, error, token) = db.common_webLogin(username, password, 'Python backend', '127.0.0.1')
+if not status:
+    print('Fail to login.')
+    sys.exit(1)
+(status, error, collectionList) = db.collection_getFullOwn(token)
+if not status:
+    print('Database return an error')
+    sys.exit(1)
+print('Pick a collection to insert imported events')
+counter = 0
+for i in collectionList:
+    print('{}\t{}'.format(counter, i[1]))
+    counter += 1
+pickedIndex = int(input())
+collectionUuid = collectionList[pickedIndex][0]
+
+# ============================ analyse file
+eventCount = 0
+allCount = 0
+for component in cal.walk():
+    allCount += 1
+    # only import event chunk
+    if component.name == 'VEVENT':
+        eventCount += 1
+        title = str(component.get('SUMMARY'))
+        descriptionPrototype = {
+            'color': '#1e90ff',
+            'description': None
+        }
+        descriptionList = []
+        if component.get('DESCRIPTION') is not None and str(component.get('DESCRIPTION')) != '':
+            descriptionList.append(component.get('DESCRIPTION'))
+        if component.get('LOCATION') is not None and str(component.get('LOCATION')) != '':
+            descriptionList.append(component.get('LOCATION'))
+        descriptionPrototype['description'] = '\n'.join(descriptionList)
+        description = json.dumps(descriptionPrototype)
+    
+        (eventDateTimeStart, eventDateTimeEnd, timezoneOffset) = AdvancedDateTimeAnalyser(component)
+        loopRules = LoopRulesConverter(component)
+
+        (status, _, _) = db.calendar_add(
+            token,
+            collectionUuid,
+            title,
+            description,
+            eventDateTimeStart,
+            eventDateTimeEnd,
+            loopRules,
+            timezoneOffset
+        )
+        if not status:
+            print('Database return an error')
+            sys.exit(1)
+        
+db.common_logout(token)
+db.close()
+print('All chunk: {}\nEvent count: {}'.format(allCount, eventCount))

assets/migration/README.md

@@ -0,0 +1,3 @@
+# Migration
+
+This directory contains the migration scripts for the database.

assets/migration/v1_to_v2.sqlite.sql

@@ -0,0 +1,49 @@
+-- Migration script for coconut-leaf database v1 to v2
+-- This script updates field names by:
+-- 1. Removing 'ccn_' prefix from all fields
+-- 2. Converting camelCase to snake_case
+
+-- Step 1: Rename user table columns
+ALTER TABLE user RENAME COLUMN ccn_name TO name;
+ALTER TABLE user RENAME COLUMN ccn_password TO password;
+ALTER TABLE user RENAME COLUMN ccn_isAdmin TO is_admin;
+ALTER TABLE user RENAME COLUMN ccn_salt TO salt;
+
+-- Step 2: Rename token table columns
+ALTER TABLE token RENAME COLUMN ccn_user TO user;
+ALTER TABLE token RENAME COLUMN ccn_token TO token;
+ALTER TABLE token RENAME COLUMN ccn_tokenExpireOn TO token_expire_on;
+ALTER TABLE token RENAME COLUMN ccn_ua TO ua;
+ALTER TABLE token RENAME COLUMN ccn_ip TO ip;
+
+-- Step 3: Rename collection table columns
+ALTER TABLE collection RENAME COLUMN ccn_uuid TO uuid;
+ALTER TABLE collection RENAME COLUMN ccn_name TO name;
+ALTER TABLE collection RENAME COLUMN ccn_user TO user;
+ALTER TABLE collection RENAME COLUMN ccn_lastChange TO last_change;
+
+-- Step 4: Rename share table columns
+ALTER TABLE share RENAME COLUMN ccn_uuid TO uuid;
+ALTER TABLE share RENAME COLUMN ccn_target TO target;
+
+-- Step 5: Rename calendar table columns
+ALTER TABLE calendar RENAME COLUMN ccn_uuid TO uuid;
+ALTER TABLE calendar RENAME COLUMN ccn_belongTo TO belong_to;
+ALTER TABLE calendar RENAME COLUMN ccn_title TO title;
+ALTER TABLE calendar RENAME COLUMN ccn_description TO description;
+ALTER TABLE calendar RENAME COLUMN ccn_lastChange TO last_change;
+ALTER TABLE calendar RENAME COLUMN ccn_eventDateTimeStart TO event_date_time_start;
+ALTER TABLE calendar RENAME COLUMN ccn_eventDateTimeEnd TO event_date_time_end;
+ALTER TABLE calendar RENAME COLUMN ccn_timezoneOffset TO timezone_offset;
+ALTER TABLE calendar RENAME COLUMN ccn_loopRules TO loop_rules;
+ALTER TABLE calendar RENAME COLUMN ccn_loopDateTimeStart TO loop_date_time_start;
+ALTER TABLE calendar RENAME COLUMN ccn_loopDateTimeEnd TO loop_date_time_end;
+
+-- Step 6: Rename todo table columns
+ALTER TABLE todo RENAME COLUMN ccn_uuid TO uuid;
+ALTER TABLE todo RENAME COLUMN ccn_belongTo TO belong_to;
+ALTER TABLE todo RENAME COLUMN ccn_data TO data;
+ALTER TABLE todo RENAME COLUMN ccn_lastChange TO last_change;
+
+-- Note: Foreign key constraints will be automatically updated by SQLite when renaming columns
+-- No additional steps needed for foreign keys

backend/coconut-leaf.py

@@ -1,15 +1,17 @@
 import sys
-import logging
 from argparse import ArgumentParser
 from typing import cast
 from pathlib import Path
+
 import server
 import config
 import utils
 import database
+import logger
+from logger import LOGGER, LoggerLevel
 
 
-def GetUsernamePassword():
+def GetUsernamePassword() -> tuple[str, str]:
     print("What is the first username of this calendar system?")
     cache = input()
     while not utils.IsValidUsername(cache):
@@ -26,15 +28,15 @@ def GetUsernamePassword():
 
     return (username, password)
 
-
 if __name__ == "__main__":
-    print("Coconut-leaf")
-    print("A self-host, multi-account calendar system.")
-    print("Project: https://github.com/yyc12345/coconut-leaf")
-    print("===================")
+    # Set as INFO level in default first,
+    # and we will change it once we load the configuration file.
+    logger.set_level(LoggerLevel.INFO)
 
     # Receive arguments
-    parser = ArgumentParser(description="Coconut-leaf")
+    parser = ArgumentParser(
+        description="The server of light, self-host and multi-account calendar system."
+    )
     parser.add_argument(
         "-c",
         "--config",
@@ -54,16 +56,22 @@ if __name__ == "__main__":
     )
     args = parser.parse_args()
 
+    # Show splash
+    LOGGER.info("Coconut-leaf")
+    LOGGER.info("A light, self-host and multi-account calendar system")
+    LOGGER.info("Project: https://github.com/yyc12345/coconut-leaf")
+    LOGGER.info("===================")
+
     # Load config file
     try:
         config.setup_config(cast(Path, args.config))
     except Exception as e:
-        print(f"Error loading config file: {e}")
+        LOGGER.critical(f"Error loading config file: {e}")
         sys.exit(1)
 
-    # Setup logging level
-    logging_level = logging.DEBUG if config.get_config().others.debug else logging.INFO
-    logging.basicConfig(format='[%(levelname)s] %(message)s', level=logging_level)
+    # Change logging level again according to whether enable debug mode
+    logging_level = LoggerLevel.DEBUG if config.get_config().others.debug else LoggerLevel.INFO
+    logger.set_level(logging_level)
 
     # Initialize the calendar system if needed
     if cast(bool, args.init):
@@ -72,5 +80,5 @@ if __name__ == "__main__":
         calendar.init(*gotten_data)
         calendar.close()
 
-    logging.info("Staring server...")
+    LOGGER.info("Staring server...")
     server.run()

backend/coconut-leaf.template.toml

@@ -15,7 +15,7 @@ path = "coconut-leaf.db"
 # database = "coconut_leaf"
 
 [web]
-port = 8888
+port = 8848
 
 [others]
 auto-token-clean-duration = 86400

backend/config.cfg.template

@@ -1,14 +0,0 @@
-{
-    "database-type": "sqlite",
-    "database-config": {
-        "user": "",
-        "password": "",
-        "db": "",
-        "url": "",
-        "port": 3306
-    },
-    "web": {
-        "port": 8888
-    },
-    "debug": true
-}

backend/database.py

@@ -1,54 +1,81 @@
-import config
 import sqlite3
-import utils
 import threading
-import logging
-import dt
 from typing import cast
 from pathlib import Path
+from dataclasses import dataclass
+from typing import Callable, ParamSpec, TypeVar, Generic
 
-def SafeDatabaseOperation(func):
-    def wrapper(self: 'CalendarDatabase', *args, **kwargs):
+import dt
+import utils
+import config
+from logger import LOGGER
+
+
+T = TypeVar('T')
+P = ParamSpec('P')
+R = TypeVar('R')
+
+
+@dataclass(frozen=True)
+class ResponseBody(Generic[T]):
+    """The generic response body for API return."""
+
+    success: bool
+    """True if this operation is successful, otherwise false."""
+    error: str
+    """The error message provided when operation failed."""
+    data: T | None
+    """The payload provided when operation successed."""
+
+
+class DbException(Exception):
+    """Error occurs when manipulating with database."""
+    pass
+
+
+def SafeDatabaseOperation(inner: Callable[P, R]) -> Callable[P, ResponseBody[R]]:
+    def wrapper(*args, **kwargs) -> ResponseBody[R]:
+        # extract self from args
+        self: 'CalendarDatabase' = args[0]
+        # get config
         cfg = config.get_config()
 
         with self.mutex:
-            # check database and acquire cursor
+            # try to fetching database and allocate database cursor
             try:
-                self.check_database()
-                self.cursor = self.db.cursor()
+                db = self._get_db()
+                self._allocate_cursor()
             except Exception as e:
-                self.cursor = None
+                self._free_cursor()
                 if cfg.others.debug:
-                    logging.exception(e)
-                return (False, str(e), None)
+                    LOGGER.exception(e)
+                return ResponseBody(False, str(e), None)
 
             # do real data work
             try:
                 currentTime = utils.GetCurrentTimestamp()
                 if currentTime - self.latestClean > cfg.others.auto_token_clean_duration:
                     self.latestClean = currentTime
-                    logging.info('Cleaning outdated token...')
+                    LOGGER.info('Cleaning outdated token...')
                     self.tokenOper_clean()
 
-                result = (True, '', func(self, *args, **kwargs))
-                self.cursor.close()
-                self.cursor = None
-                self.db.commit()
+                result = ResponseBody(True, '', inner(*args, **kwargs))
+                self._free_cursor()
+                db.commit()
                 return result
             except Exception as e:
-                self.cursor.close()
-                self.cursor = None
-                self.db.rollback()
+                self._free_cursor()
+                db.rollback()
                 if cfg.others.debug:
-                    logging.exception(e)
-                return (False, str(e), None)
+                    LOGGER.exception(e)
+                return ResponseBody(False, str(e), None)
 
     return wrapper
 
 class CalendarDatabase:
 
-    db: sqlite3.Connection
-    cursor: sqlite3.Cursor
+    db: sqlite3.Connection | None
+    cursor: sqlite3.Cursor | None
     mutex: threading.Lock
     latestClean: int
 
@@ -59,8 +86,8 @@ class CalendarDatabase:
         self.latestClean = 0
 
     def open(self):
-        if (self.is_database_valid()):
-            raise Exception('Databade is opened')
+        if (self.db is not None):
+            raise DbException('Database is already opened')
 
         cfg = config.get_config()
         match cfg.database.driver:
@@ -69,13 +96,13 @@ class CalendarDatabase:
                 self.db.execute('PRAGMA encoding = "UTF-8";')
                 self.db.execute('PRAGMA foreign_keys = ON;')
             case config.DatabaseDriver.MYSQL:
-                raise Exception('Not implemented database')
+                raise DbException('Not implemented database')
             case _:
-                raise Exception('Unknow database type')
+                raise DbException('Unknow database type')
 
-    def init(self, username, password):
-        if (self.is_database_valid()):
-            raise Exception('Database is opened')
+    def init(self, username: str, password: str):
+        if (self.db is not None):
+            raise DbException('Database is already opened')
 
         # establish tables
         cfg = config.get_config()
@@ -85,44 +112,74 @@ class CalendarDatabase:
             case config.DatabaseDriver.SQLITE:
                 sql_file = backend_sql_path / 'sqlite.sql'
             case config.DatabaseDriver.MYSQL:
-                raise Exception('Not implemented database')
+                raise DbException('Not implemented database')
             case _:
-                raise Exception('Unknow database type')
+                raise DbException('Unknow database type')
 
         self.open()
-        cursor = self.db.cursor()
+        db = self._get_db()
+
+        self._allocate_cursor()
+        cursor = self._get_cursor()
+
+        # execute script for creating tables
         with open(sql_file, 'r', encoding='utf-8') as fsql:
             cursor.executescript(fsql.read())
-
-        # finish init
+        # add default user in user table
         cursor.execute('INSERT INTO user VALUES (?, ?, ?, ?);', (
             username,
             utils.ComputePasswordHash(password),
             1,
             utils.GenerateSalt()
         ))
-        cursor.close()
-        self.db.commit()
+
+        self._free_cursor()
+
+        # commit to database
+        db.commit()
 
     def close(self):
-        self.check_database()
+        if (self.db is None):
+            LOGGER.warning('Try to close null database.')
+        else:
+            self._free_cursor()
             self.db.close()
             self.db = None
 
-    def check_database(self):
-        if (not self.is_database_valid()):
-            raise Exception('Databade is None')
+    def _get_db(self) -> sqlite3.Connection:
+        if (self.db is None):
+            raise DbException('There is no opened database')
+        else:
+            return self.db
 
-    def is_database_valid(self):
-        return not (self.db == None)
+    def _allocate_cursor(self) -> None:
+        if (self.cursor is not None):
+            raise DbException('There is already opened database cursor')
+        else:
+            self.cursor = self._get_db().cursor()
+
+    def _get_cursor(self) -> sqlite3.Cursor:
+        if (self.cursor is None):
+            raise DbException('There is no opened database cursor')
+        else:
+            return self.cursor
+
+    def _free_cursor(self) -> None:
+        if (self.cursor is None):
+            LOGGER.warning('Try to free null databse cursor.')
+        else:
+            self.cursor.close()
+            self.cursor = None
 
     # ======================= token related internal operation
     def tokenOper_clean(self):
         # remove outdated token
-        self.cursor.execute('DELETE FROM token WHERE [ccn_tokenExpireOn] <= ?',(utils.GetCurrentTimestamp(), ))
+        cursor = self._get_cursor()
+        cursor.execute('DELETE FROM token WHERE [token_expire_on] <= ?',(utils.GetCurrentTimestamp(), ))
 
     def tokenOper_postpone_expireOn(self, token):
-        self.cursor.execute('UPDATE token SET [ccn_tokenExpireOn] = ? WHERE [ccn_token] = ?;', (
+        cursor = self._get_cursor()
+        cursor.execute('UPDATE token SET [token_expire_on] = ? WHERE [token] = ?;', (
             utils.GetTokenExpireOn(),
             token
         ))
@@ -131,16 +188,18 @@ class CalendarDatabase:
         self.tokenOper_get_username(token)
 
     def tokenOper_is_admin(self, username):
-        self.cursor.execute('SELECT [ccn_isAdmin] FROM user WHERE [ccn_name] = ?;',(username, ))
-        cache = self.cursor.fetchone()[0]
+        cursor = self._get_cursor()
+        cursor.execute('SELECT [is_admin] FROM user WHERE [name] = ?;',(username, ))
+        cache = cursor.fetchone()[0]
         return cache == 1
 
     def tokenOper_get_username(self, token):
-        self.cursor.execute('SELECT [ccn_user] FROM token WHERE [ccn_token] = ? AND [ccn_tokenExpireOn] > ?;',(
+        cursor = self._get_cursor()
+        cursor.execute('SELECT [user] FROM token WHERE [token] = ? AND [token_expire_on] > ?;',(
             token,
             utils.GetCurrentTimestamp()
         ))
-        result = self.cursor.fetchone()[0]
+        result = cursor.fetchone()[0]
         # need postpone expire on time
         self.tokenOper_postpone_expireOn(token)
         return result
@@ -150,8 +209,9 @@ class CalendarDatabase:
     
     @SafeDatabaseOperation
     def common_salt(self, username):
+        cursor = self._get_cursor()
         salt = utils.GenerateSalt()
-        self.cursor.execute('UPDATE user SET [ccn_salt] = ? WHERE [ccn_name] = ?;', (
+        cursor.execute('UPDATE user SET [salt] = ? WHERE [name] = ?;', (
             salt,
             username
         ))
@@ -159,16 +219,17 @@ class CalendarDatabase:
 
     @SafeDatabaseOperation
     def common_login(self, username, password, clientUa, clientIp):
-        self.cursor.execute('SELECT [ccn_password], [ccn_salt] FROM user WHERE [ccn_name] = ?;', (username, ))
-        (gotten_salt, gotten_password) = self.cursor.fetchone()
+        cursor = self._get_cursor()
+        cursor.execute('SELECT [password], [salt] FROM user WHERE [name] = ?;', (username, ))
+        (gotten_salt, gotten_password) = cursor.fetchone()
         
         if password == utils.ComputePasswordHashWithSalt(gotten_password, gotten_salt):
             token = utils.GenerateToken(username)
-            self.cursor.execute('UPDATE user SET [ccn_salt] = ? WHERE [ccn_name] = ?;', (
+            cursor.execute('UPDATE user SET [salt] = ? WHERE [name] = ?;', (
                 utils.GenerateSalt(), # regenerate a new slat to prevent re-login try
                 username
             ))
-            self.cursor.execute('INSERT INTO token VALUES (?, ?, ?, ?, ?);', (
+            cursor.execute('INSERT INTO token VALUES (?, ?, ?, ?, ?);', (
                 username,
                 token,
                 utils.GetTokenExpireOn(), # add 2 day from now
@@ -178,15 +239,21 @@ class CalendarDatabase:
             return token
         else:
             # throw a exception to indicate fail to login
-            raise Exception('Login authentication failed')
+            raise DbException('Login authentication failed')
 
     @SafeDatabaseOperation
     def common_webLogin(self, username, password, clientUa, clientIp):
-        self.cursor.execute('SELECT [ccn_name] FROM user WHERE [ccn_name] = ? AND [ccn_password] = ?;', (username, utils.ComputePasswordHash(password)))
+        cursor = self._get_cursor()
+        LOGGER.debug(f'WebLogin Username: {username}')
+        LOGGER.debug(f'WebLogin Password: {password}')
+        passwordHash = utils.ComputePasswordHash(password)
+        LOGGER.debug(f'WebLogin Password Hash: {passwordHash}')
 
-        if len(self.cursor.fetchall()) != 0:
+        cursor.execute('SELECT [name] FROM user WHERE [name] = ? AND [password] = ?;', (username, passwordHash))
+
+        if len(cursor.fetchall()) != 0:
             token = utils.GenerateToken(username)
-            self.cursor.execute('INSERT INTO token VALUES (?, ?, ?, ?, ?);', (
+            cursor.execute('INSERT INTO token VALUES (?, ?, ?, ?, ?);', (
                 username,
                 token,
                 utils.GetTokenExpireOn(), # add 2 day from now
@@ -196,12 +263,13 @@ class CalendarDatabase:
             return token
         else:
             # throw a exception to indicate fail to login
-            raise Exception('Login authentication failed')
+            raise DbException('Login authentication failed')
 
     @SafeDatabaseOperation
     def common_logout(self, token):
+        cursor = self._get_cursor()
         self.tokenOper_check_valid(token)
-        self.cursor.execute('DELETE FROM token WHERE [ccn_token] = ?;', (token, ))
+        cursor.execute('DELETE FROM token WHERE [token] = ?;', (token, ))
         return True
 
     @SafeDatabaseOperation
@@ -212,40 +280,44 @@ class CalendarDatabase:
     # =============================== calendar
     @SafeDatabaseOperation
     def calendar_getFull(self, token, startDateTime, endDateTime):
+        cursor = self._get_cursor()
         username = self.tokenOper_get_username(token)
-        self.cursor.execute('SELECT calendar.* FROM calendar INNER JOIN collection \
-                ON collection.ccn_uuid = calendar.ccn_belongTo \
-                WHERE (collection.ccn_user = ? AND calendar.ccn_loopDateTimeEnd >= ? AND calendar.ccn_loopDateTimeStart - (calendar.ccn_eventDateTimeEnd - calendar.ccn_eventDateTimeStart) <= ?);', 
+        cursor.execute('SELECT calendar.* FROM calendar INNER JOIN collection \
+                ON collection.uuid = calendar.belong_to \
+                WHERE (collection.user = ? AND calendar.loop_date_time_end >= ? AND calendar.loop_date_time_start - (calendar.event_date_time_end - calendar.event_date_time_start) <= ?);', 
                 (username, startDateTime, endDateTime))
-        return self.cursor.fetchall()
+        return cursor.fetchall()
 
     @SafeDatabaseOperation
     def calendar_getList(self, token, startDateTime, endDateTime):
+        cursor = self._get_cursor()
         username = self.tokenOper_get_username(token)
-        self.cursor.execute('SELECT calendar.ccn_uuid FROM calendar INNER JOIN collection \
-                ON collection.ccn_uuid = calendar.ccn_belongTo \
-                WHERE (collection.ccn_user = ? AND calendar.ccn_loopDateTimeEnd >= ? AND calendar.ccn_loopDateTimeStart - (calendar.ccn_eventDateTimeEnd - calendar.ccn_eventDateTimeStart) <= ?);', 
+        cursor.execute('SELECT calendar.uuid FROM calendar INNER JOIN collection \
+                ON collection.uuid = calendar.belong_to \
+                WHERE (collection.user = ? AND calendar.loop_date_time_end >= ? AND calendar.loop_date_time_start - (calendar.event_date_time_end - calendar.event_date_time_start) <= ?);', 
                 (username, startDateTime, endDateTime))
-        return tuple(map(lambda x: x[0], self.cursor.fetchall()))
+        return tuple(map(lambda x: x[0], cursor.fetchall()))
 
     @SafeDatabaseOperation
     def calendar_getDetail(self, token, uuid):
+        cursor = self._get_cursor()
         self.tokenOper_check_valid(token)
-        self.cursor.execute('SELECT * FROM calendar WHERE [ccn_uuid] = ?;', (uuid, ))
-        return self.cursor.fetchone()
+        cursor.execute('SELECT * FROM calendar WHERE [uuid] = ?;', (uuid, ))
+        return cursor.fetchone()
 
     @SafeDatabaseOperation
     def calendar_update(self, token, uuid, lastChange, **optArgs):
+        cursor = self._get_cursor()
         self.tokenOper_check_valid(token)
 
         # get prev data
-        self.cursor.execute('SELECT * FROM calendar WHERE [ccn_uuid] = ? AND [ccn_lastChange] = ?;', (uuid, lastChange))
-        analyseData = list(self.cursor.fetchone())
+        cursor.execute('SELECT * FROM calendar WHERE [uuid] = ? AND [last_change] = ?;', (uuid, lastChange))
+        analyseData = list(cursor.fetchone())
 
         # construct update data
         lastupdate = utils.GenerateUUID()
         sqlList = [
-            '[ccn_lastChange] = ?',
+            '[last_change] = ?',
         ]
         argumentsList = [
             lastupdate,
@@ -256,44 +328,44 @@ class CalendarDatabase:
 
         cache = optArgs.get('belongTo', None)
         if cache is not None:
-            sqlList.append('[ccn_belongTo] = ?')
+            sqlList.append('[belong_to] = ?')
             argumentsList.append(cache)
         cache = optArgs.get('title', None)
         if cache is not None:
-            sqlList.append('[ccn_title] = ?')
+            sqlList.append('[title] = ?')
             argumentsList.append(cache)
         cache = optArgs.get('description', None)
         if cache is not None:
-            sqlList.append('[ccn_description] = ?')
+            sqlList.append('[description] = ?')
             argumentsList.append(cache)
         cache = optArgs.get('eventDateTimeStart', None)
         if cache is not None:
-            sqlList.append('[ccn_eventDateTimeStart] = ?')
+            sqlList.append('[event_date_time_start] = ?')
             argumentsList.append(cache)
             reAnalyseLoop = True
             analyseData[5] = cache
         cache = optArgs.get('eventDateTimeEnd', None)
         if cache is not None:
-            sqlList.append('[ccn_eventDateTimeEnd] = ?')
+            sqlList.append('[event_date_time_end] = ?')
             argumentsList.append(cache)
         cache = optArgs.get('loopRules', None)
         if cache is not None:
-            sqlList.append('[ccn_loopRules] = ?')
+            sqlList.append('[loop_rules] = ?')
             argumentsList.append(cache)
             reAnalyseLoop = True
             analyseData[8] = cache
         cache = optArgs.get('timezoneOffset', None)
         if cache is not None:
-            sqlList.append('[ccn_timezoneOffset] = ?')
+            sqlList.append('[timezone_offset] = ?')
             argumentsList.append(cache)
             reAnalyseLoop = True
             analyseData[7] = cache
 
         if reAnalyseLoop:
             # re-compute loop data and upload it into list
-            sqlList.append('[ccn_loopDateTimeStart] = ?')
+            sqlList.append('[loop_date_time_start] = ?')
             argumentsList.append(analyseData[5])
-            sqlList.append('[ccn_loopDateTimeEnd] = ?')
+            sqlList.append('[loop_date_time_end] = ?')
             argumentsList.append(str(dt.ResolveLoopStr(
                 analyseData[8],
                 analyseData[5],
@@ -302,14 +374,15 @@ class CalendarDatabase:
 
         # execute
         argumentsList.append(uuid)
-        self.cursor.execute('UPDATE calendar SET {} WHERE [ccn_uuid] = ?;'.format(', '.join(sqlList)), 
+        cursor.execute('UPDATE calendar SET {} WHERE [uuid] = ?;'.format(', '.join(sqlList)), 
         tuple(argumentsList))
-        if self.cursor.rowcount != 1:
-            raise Exception('Fail to update due to no matched rows or too much rows.')
+        if cursor.rowcount != 1:
+            raise DbException('Fail to update due to no matched rows or too much rows.')
         return lastupdate
 
     @SafeDatabaseOperation
     def calendar_add(self, token, belongTo, title, description, eventDateTimeStart, eventDateTimeEnd, loopRules, timezoneOffset):
+        cursor = self._get_cursor()
         self.tokenOper_check_valid(token)
 
         newuuid = utils.GenerateUUID()
@@ -319,7 +392,7 @@ class CalendarDatabase:
         loopDateTimeStart = eventDateTimeStart
         loopDateTimeEnd = dt.ResolveLoopStr(loopRules, eventDateTimeStart, timezoneOffset)
 
-        self.cursor.execute('INSERT INTO calendar VALUES (?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?);', 
+        cursor.execute('INSERT INTO calendar VALUES (?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?);', 
         (newuuid,
         belongTo,
         title,
@@ -335,134 +408,149 @@ class CalendarDatabase:
 
     @SafeDatabaseOperation
     def calendar_delete(self, token, uuid, lastChange):
+        cursor = self._get_cursor()
         self.tokenOper_check_valid(token)
-        self.cursor.execute('DELETE FROM calendar WHERE [ccn_uuid] = ? AND [ccn_lastChange] = ?;', (uuid, lastChange))
-        if self.cursor.rowcount != 1:
-            raise Exception('Fail to delete due to no matched rows or too much rows.')
+        cursor.execute('DELETE FROM calendar WHERE [uuid] = ? AND [last_change] = ?;', (uuid, lastChange))
+        if cursor.rowcount != 1:
+            raise DbException('Fail to delete due to no matched rows or too much rows.')
         return True
 
     # =============================== collection
     @SafeDatabaseOperation
     def collection_getFullOwn(self, token):
+        cursor = self._get_cursor()
         username = self.tokenOper_get_username(token)
-        self.cursor.execute('SELECT [ccn_uuid], [ccn_name], [ccn_lastChange] FROM collection WHERE [ccn_user] = ?;', (username, ))
-        return self.cursor.fetchall()
+        cursor.execute('SELECT [uuid], [name], [last_change] FROM collection WHERE [user] = ?;', (username, ))
+        return cursor.fetchall()
 
     @SafeDatabaseOperation
     def collection_getListOwn(self, token):
+        cursor = self._get_cursor()
         username = self.tokenOper_get_username(token)
-        self.cursor.execute('SELECT [ccn_uuid] FROM collection WHERE [ccn_user] = ?;', (username, ))
-        return tuple(map(lambda x: x[0], self.cursor.fetchall()))
+        cursor.execute('SELECT [uuid] FROM collection WHERE [user] = ?;', (username, ))
+        return tuple(map(lambda x: x[0], cursor.fetchall()))
 
     @SafeDatabaseOperation
     def collection_getDetailOwn(self, token, uuid):
+        cursor = self._get_cursor()
         username = self.tokenOper_get_username(token)
-        self.cursor.execute('SELECT [ccn_uuid], [ccn_name], [ccn_lastChange] FROM collection WHERE [ccn_user] = ? AND [ccn_uuid] = ?;', (username, uuid))
-        return self.cursor.fetchone()
+        cursor.execute('SELECT [uuid], [name], [last_change] FROM collection WHERE [user] = ? AND [uuid] = ?;', (username, uuid))
+        return cursor.fetchone()
 
     @SafeDatabaseOperation
     def collection_addOwn(self, token, newname):
+        cursor = self._get_cursor()
         username = self.tokenOper_get_username(token)
         newuuid = utils.GenerateUUID()
         lastupdate = utils.GenerateUUID()
-        self.cursor.execute('INSERT INTO collection VALUES (?, ?, ?, ?);',
+        cursor.execute('INSERT INTO collection VALUES (?, ?, ?, ?);',
         (newuuid, newname, username, lastupdate))
         return newuuid
 
     @SafeDatabaseOperation
     def collection_updateOwn(self, token, uuid, newname, lastChange):
+        cursor = self._get_cursor()
         self.tokenOper_check_valid(token)
 
         lastupdate = utils.GenerateUUID()
-        self.cursor.execute('UPDATE collection SET [ccn_name] = ?, [ccn_lastChange] = ? WHERE [ccn_uuid] = ? AND [ccn_lastChange] = ?;', (
+        cursor.execute('UPDATE collection SET [name] = ?, [last_change] = ? WHERE [uuid] = ? AND [last_change] = ?;', (
             newname,
             lastupdate,
             uuid,
             lastChange
         ))
-        if self.cursor.rowcount != 1:
-            raise Exception('Fail to update due to no matched rows or too much rows.')
+        if cursor.rowcount != 1:
+            raise DbException('Fail to update due to no matched rows or too much rows.')
         return lastupdate
 
     @SafeDatabaseOperation
     def collection_deleteOwn(self, token, uuid, lastChange):
+        cursor = self._get_cursor()
         self.tokenOper_check_valid(token)
 
-        self.cursor.execute('DELETE FROM collection WHERE [ccn_uuid] = ? AND [ccn_lastChange] = ?;', (
+        cursor.execute('DELETE FROM collection WHERE [uuid] = ? AND [last_change] = ?;', (
             uuid,
             lastChange
         ))
-        if self.cursor.rowcount != 1:
-            raise Exception('Fail to delete due to no matched rows or too much rows.')
+        if cursor.rowcount != 1:
+            raise DbException('Fail to delete due to no matched rows or too much rows.')
         return True
 
     @SafeDatabaseOperation
     def collection_getSharing(self, token, uuid):
+        cursor = self._get_cursor()
         self.tokenOper_check_valid(token)
-        self.cursor.execute('SELECT [ccn_target] FROM share WHERE [ccn_uuid] = ?;', (uuid, ))
-        return tuple(map(lambda x: x[0], self.cursor.fetchall()))
+        cursor.execute('SELECT [target] FROM share WHERE [uuid] = ?;', (uuid, ))
+        return tuple(map(lambda x: x[0], cursor.fetchall()))
 
     @SafeDatabaseOperation
     def collection_deleteSharing(self, token, uuid, target, lastChange):
+        cursor = self._get_cursor()
         self.tokenOper_check_valid(token)
 
         lastupdate = utils.GenerateUUID()
-        self.cursor.execute('UPDATE collection SET [ccn_lastChange] = ?, WHERE [ccn_uuid] = ? AND [ccn_lastChange] = ?;', (lastupdate, uuid, lastChange))
-        if self.cursor.rowcount != 1:
-            raise Exception('Fail to delete due to no matched rows or too much rows.')
+        cursor.execute('UPDATE collection SET [last_change] = ?, WHERE [uuid] = ? AND [last_change] = ?;', (lastupdate, uuid, lastChange))
+        if cursor.rowcount != 1:
+            raise DbException('Fail to delete due to no matched rows or too much rows.')
 
-        self.cursor.execute('DELETE FROM share WHERE [ccn_uuid] = ? AND [ccn_target] = ?;', (uuid, target))
-        if self.cursor.rowcount != 1:
-            raise Exception('Fail to delete due to no matched rows or too much rows.')
+        cursor.execute('DELETE FROM share WHERE [uuid] = ? AND [target] = ?;', (uuid, target))
+        if cursor.rowcount != 1:
+            raise DbException('Fail to delete due to no matched rows or too much rows.')
 
         return lastupdate
 
     @SafeDatabaseOperation
     def collection_addSharing(self, token, uuid, target, lastChange):
+        cursor = self._get_cursor()
         self.tokenOper_check_valid(token)
 
         lastupdate = utils.GenerateUUID()
-        self.cursor.execute('UPDATE collection SET [ccn_lastChange] = ? WHERE [ccn_uuid] = ? AND [ccn_lastChange] = ?;', (lastupdate, uuid, lastChange))
-        if self.cursor.rowcount != 1:
-            raise Exception('Fail to delete due to no matched rows or too much rows.')
+        cursor.execute('UPDATE collection SET [last_change] = ? WHERE [uuid] = ? AND [last_change] = ?;', (lastupdate, uuid, lastChange))
+        if cursor.rowcount != 1:
+            raise DbException('Fail to delete due to no matched rows or too much rows.')
 
-        self.cursor.execute('SELECT * FROM share WHERE [ccn_uuid] = ? AND [ccn_target] = ?;', (uuid, target))
-        if len(self.cursor.fetchall()) != 0:
-            raise Exception('Fail to insert duplicated item.')
-        self.cursor.execute('INSERT INTO share VALUES (?, ?);', (uuid, target))
+        cursor.execute('SELECT * FROM share WHERE [uuid] = ? AND [target] = ?;', (uuid, target))
+        if len(cursor.fetchall()) != 0:
+            raise DbException('Fail to insert duplicated item.')
+        cursor.execute('INSERT INTO share VALUES (?, ?);', (uuid, target))
 
         return lastupdate
 
     @SafeDatabaseOperation
     def collection_getShared(self, token):
+        cursor = self._get_cursor()
         username = self.tokenOper_get_username(token)
-        self.cursor.execute('SELECT collection.ccn_uuid, collection.ccn_name, collection.ccn_user \
+        cursor.execute('SELECT collection.uuid, collection.name, collection.user \
                 FROM share INNER JOIN collection \
-                ON share.ccn_uuid = collection.ccn_uuid \
-                WHERE share.ccn_target = ?;', (username, ))
-        return self.cursor.fetchall()
+                ON share.uuid = collection.uuid \
+                WHERE share.target = ?;', (username, ))
+        return cursor.fetchall()
 
     # =============================== todo
     @SafeDatabaseOperation
     def todo_getFull(self, token):
+        cursor = self._get_cursor()
         username = self.tokenOper_get_username(token)
-        self.cursor.execute('SELECT * FROM todo WHERE [ccn_belongTo] = ?;', (username, ))
-        return self.cursor.fetchall()
+        cursor.execute('SELECT * FROM todo WHERE [belong_to] = ?;', (username, ))
+        return cursor.fetchall()
 
     @SafeDatabaseOperation
     def todo_getList(self, token):
+        cursor = self._get_cursor()
         username = self.tokenOper_get_username(token)
-        self.cursor.execute('SELECT [ccn_uuid] FROM todo WHERE [ccn_belongTo] = ?;', (username, ))
-        return tuple(map(lambda x: x[0], self.cursor.fetchall()))
+        cursor.execute('SELECT [uuid] FROM todo WHERE [belong_to] = ?;', (username, ))
+        return tuple(map(lambda x: x[0], cursor.fetchall()))
 
     @SafeDatabaseOperation
     def todo_getDetail(self, token, uuid):
+        cursor = self._get_cursor()
         username = self.tokenOper_get_username(token)
-        self.cursor.execute('SELECT * FROM todo WHERE [ccn_belongTo] = ? AND [ccn_uuid] = ?;', (username, uuid))
-        return self.cursor.fetchone()
+        cursor.execute('SELECT * FROM todo WHERE [belong_to] = ? AND [uuid] = ?;', (username, uuid))
+        return cursor.fetchone()
 
     @SafeDatabaseOperation
     def todo_add(self, token):
+        cursor = self._get_cursor()
         username = self.tokenOper_get_username(token)
         newuuid = utils.GenerateUUID()
         lastupdate = utils.GenerateUUID()
@@ -472,56 +560,60 @@ class CalendarDatabase:
             '',
             lastupdate,
         )
-        self.cursor.execute('INSERT INTO todo VALUES (?, ?, ?, ?);', returnedData)
+        cursor.execute('INSERT INTO todo VALUES (?, ?, ?, ?);', returnedData)
         return returnedData
 
     @SafeDatabaseOperation
     def todo_update(self, token, uuid, data, lastChange):
+        cursor = self._get_cursor()
         # check valid token
         self.tokenOper_check_valid(token)
 
         # update
         newLastChange = utils.GenerateUUID()
-        self.cursor.execute('UPDATE todo SET [ccn_data] = ?, [ccn_lastChange] = ? WHERE [ccn_uuid] = ? AND [ccn_lastChange] = ?;', (
+        cursor.execute('UPDATE todo SET [data] = ?, [last_change] = ? WHERE [uuid] = ? AND [last_change] = ?;', (
             data,
             newLastChange,
             uuid,
             lastChange
         ))
-        if self.cursor.rowcount != 1:
-            raise Exception('Fail to update due to no matched rows or too much rows.')
+        if cursor.rowcount != 1:
+            raise DbException('Fail to update due to no matched rows or too much rows.')
         return newLastChange
 
     @SafeDatabaseOperation
     def todo_delete(self, token, uuid, lastChange):
+        cursor = self._get_cursor()
         # check valid token
         self.tokenOper_check_valid(token)
 
         # delete
-        self.cursor.execute('DELETE FROM todo WHERE [ccn_uuid] = ? AND [ccn_lastChange] = ?;', (uuid, lastChange))
-        if self.cursor.rowcount != 1:
-            raise Exception('Fail to delete due to no matched rows or too much rows.')
+        cursor.execute('DELETE FROM todo WHERE [uuid] = ? AND [last_change] = ?;', (uuid, lastChange))
+        if cursor.rowcount != 1:
+            raise DbException('Fail to delete due to no matched rows or too much rows.')
         return True
 
 
     # =============================== admin
     @SafeDatabaseOperation
     def admin_get(self, token):
+        cursor = self._get_cursor()
         username = self.tokenOper_get_username(token)
         if not self.tokenOper_is_admin(username):
-            raise Exception('Permission denied.')
+            raise DbException('Permission denied.')
 
-        self.cursor.execute('SELECT [ccn_name], [ccn_isAdmin] FROM user;')
-        return tuple(map(lambda x: (x[0], x[1] == 1), self.cursor.fetchall()))
+        cursor.execute('SELECT [name], [is_admin] FROM user;')
+        return tuple(map(lambda x: (x[0], x[1] == 1), cursor.fetchall()))
 
     @SafeDatabaseOperation
     def admin_add(self, token, newname):
+        cursor = self._get_cursor()
         username = self.tokenOper_get_username(token)
         if not self.tokenOper_is_admin(username):
-            raise Exception('Permission denied.')
+            raise DbException('Permission denied.')
 
         newpassword = utils.ComputePasswordHash(utils.GenerateUUID())
-        self.cursor.execute('INSERT INTO user VALUES (?, ?, ?, ?);', (
+        cursor.execute('INSERT INTO user VALUES (?, ?, ?, ?);', (
             newname,
             newpassword,
             0,
@@ -531,9 +623,10 @@ class CalendarDatabase:
 
     @SafeDatabaseOperation
     def admin_update(self, token, _username, **optArgs):
+        cursor = self._get_cursor()
         username = self.tokenOper_get_username(token)
         if not self.tokenOper_is_admin(username):
-            raise Exception('Permission denied.')
+            raise DbException('Permission denied.')
 
         # construct data
         sqlList = []
@@ -542,45 +635,48 @@ class CalendarDatabase:
         # analyse opt arg
         cache = optArgs.get('password', None)
         if cache is not None:
-            sqlList.append('[ccn_password] = ?')
+            sqlList.append('[password] = ?')
             argumentsList.append(utils.ComputePasswordHash(cache))
         cache = optArgs.get('isAdmin', None)
         if cache is not None:
-            sqlList.append('[ccn_isAdmin] = ?')
+            sqlList.append('[is_admin] = ?')
             argumentsList.append(1 if cache else 0)
 
         # execute
         argumentsList.append(_username)
-        self.cursor.execute('UPDATE user SET {} WHERE [ccn_name] = ?;'.format(', '.join(sqlList)), 
+        cursor.execute('UPDATE user SET {} WHERE [name] = ?;'.format(', '.join(sqlList)), 
         tuple(argumentsList))
-        logging.debug(cache)
-        logging.debug(tuple(argumentsList))
-        if self.cursor.rowcount != 1:
-            raise Exception('Fail to update due to no matched rows or too much rows.')
+        LOGGER.debug(cache)
+        LOGGER.debug(tuple(argumentsList))
+        if cursor.rowcount != 1:
+            raise DbException('Fail to update due to no matched rows or too much rows.')
         return True
 
     @SafeDatabaseOperation
     def admin_delete(self, token, username):
+        cursor = self._get_cursor()
         _username = self.tokenOper_get_username(token)
         if not self.tokenOper_is_admin(_username):
-            raise Exception('Permission denied.')
+            raise DbException('Permission denied.')
 
         # delete
-        self.cursor.execute('DELETE FROM user WHERE [ccn_name] = ?;', (username, ))
-        if self.cursor.rowcount != 1:
-            raise Exception('Fail to delete due to no matched rows or too much rows.')
+        cursor.execute('DELETE FROM user WHERE [name] = ?;', (username, ))
+        if cursor.rowcount != 1:
+            raise DbException('Fail to delete due to no matched rows or too much rows.')
         return True
 
     # =============================== profile
     @SafeDatabaseOperation
     def profile_isAdmin(self, token):
+        cursor = self._get_cursor()
         username = self.tokenOper_get_username(token)
         return self.tokenOper_is_admin(username)
 
     @SafeDatabaseOperation
     def profile_changePassword(self, token, newpassword):
+        cursor = self._get_cursor()
         username = self.tokenOper_get_username(token)
-        self.cursor.execute('UPDATE user SET [ccn_password] = ? WHERE [ccn_name] = ?;', (
+        cursor.execute('UPDATE user SET [password] = ? WHERE [name] = ?;', (
             utils.ComputePasswordHash(newpassword),
             username
         ))
@@ -588,23 +684,25 @@ class CalendarDatabase:
 
     @SafeDatabaseOperation
     def profile_getToken(self, token):
+        cursor = self._get_cursor()
         username = self.tokenOper_get_username(token)
 
-        self.cursor.execute('SELECT * FROM token WHERE [ccn_user] = ?;', (
+        cursor.execute('SELECT * FROM token WHERE [user] = ?;', (
             username,
         ))
-        return self.cursor.fetchall()
+        return cursor.fetchall()
 
     @SafeDatabaseOperation
     def profile_deleteToken(self, token, deleteToken):
+        cursor = self._get_cursor()
         _username = self.tokenOper_get_username(token)
 
         # delete
-        self.cursor.execute('DELETE FROM token WHERE [ccn_user] = ? AND [ccn_token] = ?;', (
+        cursor.execute('DELETE FROM token WHERE [user] = ? AND [token] = ?;', (
             _username, 
             deleteToken
         ))
-        if self.cursor.rowcount != 1:
-            raise Exception('Fail to delete due to no matched rows or too much rows.')
+        if cursor.rowcount != 1:
+            raise DbException('Fail to delete due to no matched rows or too much rows.')
         return True
 

backend/logger.py

@@ -0,0 +1,42 @@
+import logging
+import enum
+
+
+def _build_logger() -> tuple[logging.Logger, logging.Handler]:
+    # Create a new logger which is independent with Flask
+    logger = logging.getLogger("my_console_logger")
+    # Avoid message was propagated to root logger or captured by Flask logger.
+    logger.propagate = False
+    # Set initial level.
+    logger.setLevel(logging.INFO)
+
+    # Create StreamHandler to output into stderr.
+    console_handler = logging.StreamHandler()
+    console_handler.setLevel(logging.DEBUG)
+    # Set format for it.
+    formatter = logging.Formatter("[%(levelname)s] %(message)s")
+    console_handler.setFormatter(formatter)
+    # Add handler
+    logger.addHandler(console_handler)
+
+    return (logger, console_handler)
+
+
+(LOGGER, CONSOLE_HANDLER) = _build_logger()
+
+
+class LoggerLevel(enum.IntEnum):
+    DEBUG = enum.auto()
+    INFO = enum.auto()
+
+
+def set_level(level: LoggerLevel) -> None:
+    logging_level: int = logging.INFO
+    match level:
+        case LoggerLevel.DEBUG:
+            logging_level = logging.DEBUG
+        case LoggerLevel.INFO:
+            logging_level = logging.INFO
+
+    LOGGER.setLevel(logging_level)
+    CONSOLE_HANDLER.setLevel(logging_level)

backend/server.py

@@ -1,457 +1,513 @@
 from flask import Flask
-# from flask import g
-from flask import render_template
-from flask import url_for
 from flask import request
-# from flask import abort
-from flask import redirect
-
-# from functools import reduce
-# import json
-# import os
+from dataclasses import dataclass
+from typing import Any, Callable, ParamSpec, TypeVar, Generic
 
 import config
 import database
 import utils
-from pathlib import Path
+from logger import LOGGER
+from database import ResponseBody
 
-_FRONTEND_PATH = Path(__file__).resolve().parent.parent / "frontend"
-app = Flask(
-    __name__,
-    static_folder=_FRONTEND_PATH / "static",
-    template_folder=_FRONTEND_PATH / "templates",
-)
+app = Flask(__name__)
 calendar_db = database.CalendarDatabase()
 
-# render_static_resources = None
+# region: API Route
 
-# =============================================database
-
-# def get_database():
-#     db = getattr(g, '_database', None)
-#     if db is None:
-#         db = database.CalendarDatabase()
-#         db.open()
-#     return db
-
-# @app.teardown_appcontext
-# def close_database(exception):
-#     db = getattr(g, '_database', None)
-#     if db is not None:
-#         db.close()
+# region: Common
 
 
-# ============================================= static page route
-
-@app.route('/', methods=['GET'])
-def nospecHandle():
-    return redirect(url_for('web_homeHandle'))
-
-@app.route('/web/home', methods=['GET'])
-def web_homeHandle():
-    # UpdateStaticResources()
-    return render_template("home.html")
-
-@app.route('/web/calendar', methods=['GET'])
-def web_calendarHandle():
-    # UpdateStaticResources()
-    return render_template("calendar.html")
-
-@app.route('/web/todo', methods=['GET'])
-def web_todoHandle():
-    # UpdateStaticResources()
-    return render_template("todo.html")
-
-@app.route('/web/admin', methods=['GET'])
-def web_adminHandle():
-    # UpdateStaticResources()
-    return render_template("admin.html")
-
-@app.route('/web/login', methods=['GET'])
-def web_loginHandle():
-    # UpdateStaticResources()
-    return render_template("login.html")
-
-@app.route('/web/collection', methods=['GET'])
-def web_collectionHandle():
-    # UpdateStaticResources()
-    return render_template("collection.html")
-
-@app.route('/web/eventAdd', methods=['GET'])
-def web_eventAddHandle():
-    # UpdateStaticResources()
-    return render_template("event.html",
-        uuidPath=''
-    )
-
-@app.route('/web/eventUpdate/<path:uuidPath>', methods=['GET'])
-def web_eventUpdateHandle(uuidPath):
-    # UpdateStaticResources()
-    return render_template("event.html",
-        uuidPath = uuidPath
-    )
-
-# ============================================= query page route
-
-# ================================ common
-
-@app.route('/api/common/salt', methods=['POST'])
+@app.route("/common/salt", methods=["POST"])
 def api_common_saltHandle():
-    return SmartDbCaller(calendar_db.common_salt, 
-    (('username', str, False), ),
-    None)
+    return SmartDbCaller(
+        calendar_db.common_salt, (FormField("username", str, False),), None
+    )
 
-@app.route('/api/common/login', methods=['POST'])
+
+@app.route("/common/login", methods=["POST"])
 def api_common_loginHandle():
-    # construct client data first
-    clientUa = request.user_agent.string
-    if request.headers.getlist("X-Forwarded-For"):
-        clientIp = request.headers.getlist("X-Forwarded-For")[0]
-    else:
-        clientIp = request.remote_addr
+    clientInfo = FetchClientNetworkInfo()
 
-    return SmartDbCaller(calendar_db.common_login, 
-    (('username', str, False), 
-    ('password', str, False),
-    ('clientUa', str, False),
-    ('clientIp', str, False)),
-    {
-        'clientUa': clientUa,
-        'clientIp': clientIp
-    })
+    return SmartDbCaller(
+        calendar_db.common_login,
+        (
+            FormField("username", str, False),
+            FormField("password", str, False),
+            FormField("clientUa", str, False),
+            FormField("clientIp", str, False),
+        ),
+        {"clientUa": clientInfo.user_agent, "clientIp": clientInfo.ip_addr},
+    )
 
-@app.route('/api/common/webLogin', methods=['POST'])
+
+@app.route("/common/webLogin", methods=["POST"])
 def api_common_webLoginHandle():
-    # construct client data first
-    clientUa = request.user_agent.string
-    if request.headers.getlist("X-Forwarded-For"):
-        clientIp = request.headers.getlist("X-Forwarded-For")[0]
-    else:
-        clientIp = request.remote_addr
+    clientInfo = FetchClientNetworkInfo()
 
-    return SmartDbCaller(calendar_db.common_webLogin, 
-    (('username', str, False), 
-    ('password', str, False),
-    ('clientUa', str, False),
-    ('clientIp', str, False)),
-    {
-        'clientUa': clientUa,
-        'clientIp': clientIp
-    })
+    return SmartDbCaller(
+        calendar_db.common_webLogin,
+        (
+            FormField("username", str, False),
+            FormField("password", str, False),
+            FormField("clientUa", str, False),
+            FormField("clientIp", str, False),
+        ),
+        {"clientUa": clientInfo.user_agent, "clientIp": clientInfo.ip_addr},
+    )
 
-@app.route('/api/common/logout', methods=['POST'])
+
+@app.route("/common/logout", methods=["POST"])
 def api_common_logoutHandle():
-    return SmartDbCaller(calendar_db.common_logout, 
-    (('token', str, False), ),
-    None)
+    return SmartDbCaller(
+        calendar_db.common_logout, (FormField("token", str, False),), None
+    )
 
-@app.route('/api/common/tokenValid', methods=['POST'])
+
+@app.route("/common/tokenValid", methods=["POST"])
 def api_common_tokenValidHandle():
-    return SmartDbCaller(calendar_db.common_tokenValid, 
-    (('token', str, False), ),
-    None)
+    return SmartDbCaller(
+        calendar_db.common_tokenValid, (FormField("token", str, False),), None
+    )
 
-# ================================ calendar
 
-@app.route('/api/calendar/getFull', methods=['POST'])
+# endregion
+
+# region: Calendar
+
+
+@app.route("/calendar/getFull", methods=["POST"])
 def api_calendar_getFullHandle():
-    return SmartDbCaller(calendar_db.calendar_getFull, 
-    (('token', str, False),
-    ('startDateTime', int, False),
-    ('endDateTime', int, False)),
-    None)
+    return SmartDbCaller(
+        calendar_db.calendar_getFull,
+        (
+            FormField("token", str, False),
+            FormField("startDateTime", int, False),
+            FormField("endDateTime", int, False),
+        ),
+        None,
+    )
 
-@app.route('/api/calendar/getList', methods=['POST'])
+
+@app.route("/calendar/getList", methods=["POST"])
 def api_calendar_getListHandle():
-    return SmartDbCaller(calendar_db.calendar_getList, 
-    (('token', str, False),
-    ('startDateTime', int, False),
-    ('endDateTime', int, False)),
-    None)
+    return SmartDbCaller(
+        calendar_db.calendar_getList,
+        (
+            FormField("token", str, False),
+            FormField("startDateTime", int, False),
+            FormField("endDateTime", int, False),
+        ),
+        None,
+    )
 
-@app.route('/api/calendar/getDetail', methods=['POST'])
+
+@app.route("/calendar/getDetail", methods=["POST"])
 def api_calendar_getDetailHandle():
-    return SmartDbCaller(calendar_db.calendar_getDetail, 
-    (('token', str, False),
-    ('uuid', str, False)),
-    None)
+    return SmartDbCaller(
+        calendar_db.calendar_getDetail,
+        (FormField("token", str, False), FormField("uuid", str, False)),
+        None,
+    )
 
-@app.route('/api/calendar/update', methods=['POST'])
+
+@app.route("/calendar/update", methods=["POST"])
 def api_calendar_updateHandle():
-    return SmartDbCaller(calendar_db.calendar_update, 
-    (('token', str, False),
-    ('uuid', str, False),
-    ('belongTo', str, True),
-    ('title', str, True),
-    ('description', str, True),
-    ('eventDateTimeStart', int, True),
-    ('eventDateTimeEnd', int, True),
-    ('loopRules', str, True),
-    ('timezoneOffset', int, True),
-    ('lastChange', str, False)),
-    None)
+    return SmartDbCaller(
+        calendar_db.calendar_update,
+        (
+            FormField("token", str, False),
+            FormField("uuid", str, False),
+            FormField("belongTo", str, True),
+            FormField("title", str, True),
+            FormField("description", str, True),
+            FormField("eventDateTimeStart", int, True),
+            FormField("eventDateTimeEnd", int, True),
+            FormField("loopRules", str, True),
+            FormField("timezoneOffset", int, True),
+            FormField("lastChange", str, False),
+        ),
+        None,
+    )
 
-@app.route('/api/calendar/add', methods=['POST'])
+
+@app.route("/calendar/add", methods=["POST"])
 def api_calendar_addHandle():
-    return SmartDbCaller(calendar_db.calendar_add, 
-    (('token', str, False),
-    ('belongTo', str, False),
-    ('title', str, False),
-    ('description', str, False),
-    ('eventDateTimeStart', int, False),
-    ('eventDateTimeEnd', int, False),
-    ('loopRules', str, False),
-    ('timezoneOffset', int, False)),
-    None)
+    return SmartDbCaller(
+        calendar_db.calendar_add,
+        (
+            FormField("token", str, False),
+            FormField("belongTo", str, False),
+            FormField("title", str, False),
+            FormField("description", str, False),
+            FormField("eventDateTimeStart", int, False),
+            FormField("eventDateTimeEnd", int, False),
+            FormField("loopRules", str, False),
+            FormField("timezoneOffset", int, False),
+        ),
+        None,
+    )
 
-@app.route('/api/calendar/delete', methods=['POST'])
+
+@app.route("/calendar/delete", methods=["POST"])
 def api_calendar_deleteHandle():
-    return SmartDbCaller(calendar_db.calendar_delete, 
-    (('token', str, False),
-    ('uuid', str, False),
-    ('lastChange', str, False)),
-    None)
+    return SmartDbCaller(
+        calendar_db.calendar_delete,
+        (
+            FormField("token", str, False),
+            FormField("uuid", str, False),
+            FormField("lastChange", str, False),
+        ),
+        None,
+    )
 
-# ================================ collection
 
-@app.route('/api/collection/getFullOwn', methods=['POST'])
+# endregion
+
+# region: Collection
+
+
+@app.route("/collection/getFullOwn", methods=["POST"])
 def api_collection_getFullOwnHandle():
-    return SmartDbCaller(calendar_db.collection_getFullOwn, 
-    (('token', str, False), ),
-    None)
+    return SmartDbCaller(
+        calendar_db.collection_getFullOwn, (FormField("token", str, False),), None
+    )
 
-@app.route('/api/collection/getListOwn', methods=['POST'])
+
+@app.route("/collection/getListOwn", methods=["POST"])
 def api_collection_getListOwnHandle():
-    return SmartDbCaller(calendar_db.collection_getListOwn, 
-    (('token', str, False), ),
-    None)
+    return SmartDbCaller(
+        calendar_db.collection_getListOwn, (FormField("token", str, False),), None
+    )
 
-@app.route('/api/collection/getDetailOwn', methods=['POST'])
+
+@app.route("/collection/getDetailOwn", methods=["POST"])
 def api_collection_getDetailOwnHandle():
-    return SmartDbCaller(calendar_db.collection_getDetailOwn, 
-    (('token', str, False), 
-    ('uuid', str, False)),
-    None)
+    return SmartDbCaller(
+        calendar_db.collection_getDetailOwn,
+        (FormField("token", str, False), FormField("uuid", str, False)),
+        None,
+    )
 
-@app.route('/api/collection/addOwn', methods=['POST'])
+
+@app.route("/collection/addOwn", methods=["POST"])
 def api_collection_addOwnHandle():
-    return SmartDbCaller(calendar_db.collection_addOwn, 
-    (('token', str, False), 
-    ('name', str, False)),
-    None)
+    return SmartDbCaller(
+        calendar_db.collection_addOwn,
+        (FormField("token", str, False), FormField("name", str, False)),
+        None,
+    )
 
-@app.route('/api/collection/updateOwn', methods=['POST'])
+
+@app.route("/collection/updateOwn", methods=["POST"])
 def api_collection_updateOwnHandle():
-    return SmartDbCaller(calendar_db.collection_updateOwn, 
-    (('token', str, False), 
-    ('uuid', str, False),
-    ('name', str, False), 
-    ('lastChange', str, False)),
-    None)
+    return SmartDbCaller(
+        calendar_db.collection_updateOwn,
+        (
+            FormField("token", str, False),
+            FormField("uuid", str, False),
+            FormField("name", str, False),
+            FormField("lastChange", str, False),
+        ),
+        None,
+    )
 
-@app.route('/api/collection/deleteOwn', methods=['POST'])
+
+@app.route("/collection/deleteOwn", methods=["POST"])
 def api_collection_deleteOwnHandle():
-    return SmartDbCaller(calendar_db.collection_deleteOwn, 
-    (('token', str, False), 
-    ('uuid', str, False),
-    ('lastChange', str, False)),
-    None)
+    return SmartDbCaller(
+        calendar_db.collection_deleteOwn,
+        (
+            FormField("token", str, False),
+            FormField("uuid", str, False),
+            FormField("lastChange", str, False),
+        ),
+        None,
+    )
 
 
-@app.route('/api/collection/getSharing', methods=['POST'])
+@app.route("/collection/getSharing", methods=["POST"])
 def api_collection_getSharingHandle():
-    return SmartDbCaller(calendar_db.collection_getSharing, 
-    (('token', str, False), 
-    ('uuid', str, False)),
-    None)
+    return SmartDbCaller(
+        calendar_db.collection_getSharing,
+        (FormField("token", str, False), FormField("uuid", str, False)),
+        None,
+    )
 
-@app.route('/api/collection/deleteSharing', methods=['POST'])
+
+@app.route("/collection/deleteSharing", methods=["POST"])
 def api_collection_deleteSharingHandle():
-    return SmartDbCaller(calendar_db.collection_deleteSharing, 
-    (('token', str, False), 
-    ('uuid', str, False),
-    ('target', str, False),
-    ('lastChange', str, False)),
-    None)
+    return SmartDbCaller(
+        calendar_db.collection_deleteSharing,
+        (
+            FormField("token", str, False),
+            FormField("uuid", str, False),
+            FormField("target", str, False),
+            FormField("lastChange", str, False),
+        ),
+        None,
+    )
 
-@app.route('/api/collection/addSharing', methods=['POST'])
+
+@app.route("/collection/addSharing", methods=["POST"])
 def api_collection_addSharingHandle():
-    return SmartDbCaller(calendar_db.collection_addSharing, 
-    (('token', str, False), 
-    ('uuid', str, False),
-    ('target', str, False),
-    ('lastChange', str, False)),
-    None)
+    return SmartDbCaller(
+        calendar_db.collection_addSharing,
+        (
+            FormField("token", str, False),
+            FormField("uuid", str, False),
+            FormField("target", str, False),
+            FormField("lastChange", str, False),
+        ),
+        None,
+    )
 
 
-@app.route('/api/collection/getShared', methods=['POST'])
+@app.route("/collection/getShared", methods=["POST"])
 def api_collection_getSharedHandle():
-    return SmartDbCaller(calendar_db.collection_getShared, 
-    (('token', str, False), ),
-    None)
+    return SmartDbCaller(
+        calendar_db.collection_getShared, (FormField("token", str, False),), None
+    )
 
-# ================================ todo
 
-@app.route('/api/todo/getFull', methods=['POST'])
+# endregion
+
+# region: Todo
+
+
+@app.route("/todo/getFull", methods=["POST"])
 def api_todo_getFullHandle():
-    return SmartDbCaller(calendar_db.todo_getFull, 
-    (('token', str, False), ),
-    None)
+    return SmartDbCaller(
+        calendar_db.todo_getFull, (FormField("token", str, False),), None
+    )
 
-@app.route('/api/todo/getList', methods=['POST'])
+
+@app.route("/todo/getList", methods=["POST"])
 def api_todo_getListHandle():
-    return SmartDbCaller(calendar_db.todo_getList, 
-    (('token', str, False), ),
-    None)
+    return SmartDbCaller(
+        calendar_db.todo_getList, (FormField("token", str, False),), None
+    )
 
-@app.route('/api/todo/getDetail', methods=['POST'])
+
+@app.route("/todo/getDetail", methods=["POST"])
 def api_todo_getDetailHandle():
-    return SmartDbCaller(calendar_db.todo_getDetail, 
-    (('token', str, False), 
-    ('uuid', str, False)),
-    None)
+    return SmartDbCaller(
+        calendar_db.todo_getDetail,
+        (FormField("token", str, False), FormField("uuid", str, False)),
+        None,
+    )
 
-@app.route('/api/todo/add', methods=['POST'])
+
+@app.route("/todo/add", methods=["POST"])
 def api_todo_addHandle():
-    return SmartDbCaller(calendar_db.todo_add, 
-    (('token', str, False), ),
-    None)
+    return SmartDbCaller(calendar_db.todo_add, (FormField("token", str, False),), None)
 
-@app.route('/api/todo/update', methods=['POST'])
+
+@app.route("/todo/update", methods=["POST"])
 def api_todo_updateHandle():
-    return SmartDbCaller(calendar_db.todo_update, 
-    (('token', str, False), 
-    ('uuid', str, False), 
-    ('data', str, False), 
-    ('lastChange', str, False)),
-    None)
+    return SmartDbCaller(
+        calendar_db.todo_update,
+        (
+            FormField("token", str, False),
+            FormField("uuid", str, False),
+            FormField("data", str, False),
+            FormField("lastChange", str, False),
+        ),
+        None,
+    )
 
-@app.route('/api/todo/delete', methods=['POST'])
+
+@app.route("/todo/delete", methods=["POST"])
 def api_todo_deleteHandle():
-    return SmartDbCaller(calendar_db.todo_delete, 
-    (('token', str, False), 
-    ('uuid', str, False), 
-    ('lastChange', str, False)),
-    None)
+    return SmartDbCaller(
+        calendar_db.todo_delete,
+        (
+            FormField("token", str, False),
+            FormField("uuid", str, False),
+            FormField("lastChange", str, False),
+        ),
+        None,
+    )
 
-# ================================ admin
 
-@app.route('/api/admin/get', methods=['POST'])
+# endregion
+
+# region: Admin
+
+
+@app.route("/admin/get", methods=["POST"])
 def api_admin_getHandle():
-    return SmartDbCaller(calendar_db.admin_get, 
-    (('token', str, False), ),
-    None)
+    return SmartDbCaller(calendar_db.admin_get, (FormField("token", str, False),), None)
 
-@app.route('/api/admin/add', methods=['POST'])
+
+@app.route("/admin/add", methods=["POST"])
 def api_admin_addHandle():
-    return SmartDbCaller(calendar_db.admin_add, 
-    (('token', str, False), 
-    ('username', str, False)),
-    None)
+    return SmartDbCaller(
+        calendar_db.admin_add,
+        (FormField("token", str, False), FormField("username", str, False)),
+        None,
+    )
 
-@app.route('/api/admin/update', methods=['POST'])
+
+@app.route("/admin/update", methods=["POST"])
 def api_admin_updateHandle():
-    return SmartDbCaller(calendar_db.admin_update, 
-    (('token', str, False), 
-    ('username', str, False),
-    ('password', str, True),
-    ('isAdmin', utils.Str2Bool, True)),
-    None)
+    return SmartDbCaller(
+        calendar_db.admin_update,
+        (
+            FormField("token", str, False),
+            FormField("username", str, False),
+            FormField("password", str, True),
+            FormField("isAdmin", utils.Str2Bool, True),
+        ),
+        None,
+    )
 
-@app.route('/api/admin/delete', methods=['POST'])
+
+@app.route("/admin/delete", methods=["POST"])
 def api_admin_deleteHandle():
-    return SmartDbCaller(calendar_db.admin_delete, 
-    (('token', str, False), 
-    ('username', str, False)),
-    None)
+    return SmartDbCaller(
+        calendar_db.admin_delete,
+        (FormField("token", str, False), FormField("username", str, False)),
+        None,
+    )
 
-# ================================ profile
 
-@app.route('/api/profile/isAdmin', methods=['POST'])
+# endregion
+
+# region: Profile
+
+
+@app.route("/profile/isAdmin", methods=["POST"])
 def api_profile_isAdminHandle():
-    return SmartDbCaller(calendar_db.profile_isAdmin, 
-    (('token', str, False), ),
-    None)
+    return SmartDbCaller(
+        calendar_db.profile_isAdmin, (FormField("token", str, False),), None
+    )
 
-@app.route('/api/profile/changePassword', methods=['POST'])
+
+@app.route("/profile/changePassword", methods=["POST"])
 def api_profile_changePasswordHandle():
-    return SmartDbCaller(calendar_db.profile_changePassword, 
-    (('token', str, False),
-    ('password', str, False)),
-    None)
+    return SmartDbCaller(
+        calendar_db.profile_changePassword,
+        (FormField("token", str, False), FormField("password", str, False)),
+        None,
+    )
 
-@app.route('/api/profile/getToken', methods=['POST'])
+
+@app.route("/profile/getToken", methods=["POST"])
 def api_profile_getTokenHandle():
-    return SmartDbCaller(calendar_db.profile_getToken, 
-    (('token', str, False), ),
-    None)
+    return SmartDbCaller(
+        calendar_db.profile_getToken, (FormField("token", str, False),), None
+    )
 
-@app.route('/api/profile/deleteToken', methods=['POST'])
+
+@app.route("/profile/deleteToken", methods=["POST"])
 def api_profile_deleteTokenHandle():
-    return SmartDbCaller(calendar_db.profile_deleteToken, 
-    (('token', str, False),
-    ('deleteToken', str, False)),
-    None)
+    return SmartDbCaller(
+        calendar_db.profile_deleteToken,
+        (FormField("token", str, False), FormField("deleteToken", str, False)),
+        None,
+    )
 
-# =============================================main run
 
-'''
-def UpdateStaticResources():
-    global render_static_resources
-    if render_static_resources is not None:
-        return
+# endregion
 
-    render_static_resources = {
-        'url_js_localStorageAssist': url_for('static', filename='js/localStorageAssist.js'),
-        'url_js_i18n': url_for('static', filename='js/i18n.js'),
-        'url_js_api': url_for('static', filename='js/api.js'),
-        'url_js_headerNav': url_for('static', filename='js/headerNav.js'),
+# endregion
 
-        'url_tmpl_headerNac': url_for('static', filename='tmpl/headerNav.tmpl'),
+# region: Utilities
 
-        'url_js_pageHome': url_for('static', filename='js/page/home.js')
-    }
-'''
 
-def SmartDbCaller(dbMethod, paramTuple, extraDict):
-    result = (False, 'Invalid parameter', None)
-    optCount = 0
-    paramList = []
-    optParamDict = {}
-    # for each item, 
-    # item[0] is field name. 
-    # item[1] is type. 
-    # item[2] is whether it is optional field
-    realForm = request.form.to_dict()
-    if extraDict is not None:
-        realForm.update(extraDict)
-    for item in paramTuple:
-        cache = item[1](realForm.get(item[0], None))
-        if item[2]:
+@dataclass(frozen=True)
+class ClientNetworkInfo:
+    user_agent: str
+    """The user agent of client."""
+    ip_addr: str
+    """The IP address of client."""
+
+
+def FetchClientNetworkInfo() -> ClientNetworkInfo:
+    clientUa = request.user_agent.string
+    forwardIpList = request.headers.getlist("X-Forwarded-For")
+    if forwardIpList:
+        clientIp = forwardIpList[0]
+    else:
+        directIp = request.remote_addr
+        if directIp is not None:
+            clientIp = directIp
+        else:
+            clientIp = "0.0.0.0"
+
+    return ClientNetworkInfo(clientUa, clientIp)
+
+
+@dataclass(frozen=True)
+class FormField:
+    name: str
+    """The name of form field."""
+    ty: Callable[[str], Any]
+    """The type of form field."""
+    is_optional: bool
+    """True if this form field is optional, otherwise false."""
+
+
+def SmartDbCaller(
+    db_method: Callable[..., ResponseBody[Any]],
+    fields: tuple[FormField, ...],
+    padding_form: dict[str, str] | None,
+) -> dict[str, Any]:
+    opt_param_counter = 0
+    lost_required: bool = False
+    param_list: list[Any] = []
+    opt_param_dict: dict[str, Any] = {}
+
+    # fetch user passed form
+    user_form: dict[str, str] = request.form.to_dict()
+    LOGGER.debug(f"User Form: {user_form}")
+    # overwrite user form by our padding form
+    if padding_form is not None:
+        user_form.update(padding_form)
+    LOGGER.debug(f"Padded User Form: {user_form}")
+
+    # check fields one by one
+    for field in fields:
+        value = user_form.get(field.name, None)
+        if value is not None:
+            value = field.ty(value)
+
+        if field.is_optional:
             # optional param
-            if cache is not None:
-                optParamDict[item[0]] = cache
-            optCount += 1
+            if value is not None:
+                opt_param_dict[field.name] = value
+            opt_param_counter += 1
         else:
-            if cache is None:
-                break
-            paramList.append(cache)
+            # required param
+            if value is None:
+                lost_required = True
             else:
-        # at least one opt param
-        if optCount == 0 or len(optParamDict) != 0:
-            result = dbMethod(*paramList, **optParamDict)
+                param_list.append(value)
+
+    # Only execute database function if there is no lost required fields.
+    # And fulfill one of following requirements:
+    # 1. There are all required fields (optional parameter count is zero).
+    # 1. Or, there is some optional parameter.
+    LOGGER.debug(f"Has Lost Required Parameter: {lost_required}")
+    LOGGER.debug(f"All Optional Parameter Count: {opt_param_counter}")
+    LOGGER.debug(f"Available Optional Parameter Count: {len(opt_param_dict)}")
+    result: ResponseBody[Any]
+    if lost_required == False and (opt_param_counter == 0 or len(opt_param_dict) != 0):
+        result = db_method(*param_list, **opt_param_dict)
+    else:
+        result = ResponseBody(False, "Invalid parameter", None)
 
     return ConstructResponseBody(result)
 
-def ConstructResponseBody(returnedTuple):
-    return {
-        'success': returnedTuple[0],
-        'error': returnedTuple[1],
-        'data': returnedTuple[2]
-    }
+
+def ConstructResponseBody(body: ResponseBody[Any]) -> dict[str, Any]:
+    return {"success": body.success, "error": body.error, "data": body.data}
+
+
+# endregion
+
 
 def run():
     calendar_db.open()
     app.run(port=config.get_config().web.port)
     calendar_db.close()
-    

backend/sql/sqlite.sql

@@ -1,67 +1,67 @@
 CREATE TABLE user(
-    [ccn_name] TEXT NOT NULL,
-    [ccn_password] TEXT NOT NULL,
-    [ccn_isAdmin] TINYINT NOT NULL CHECK(ccn_isAdmin = 1 OR ccn_isAdmin = 0),
-    [ccn_salt] INTEGER NOT NULL,
+    [name] TEXT NOT NULL,
+    [password] TEXT NOT NULL,
+    [is_admin] TINYINT NOT NULL CHECK(is_admin = 1 OR is_admin = 0),
+    [salt] INTEGER NOT NULL,
 
-    PRIMARY KEY (ccn_name)
+    PRIMARY KEY (name)
 );
 
 CREATE TABLE token(
-    [ccn_user] TEXT NOT NULL,
-    [ccn_token] TEXT UNIQUE NOT NULL,
-    [ccn_tokenExpireOn] BIGINT NOT NULL,
-    [ccn_ua] TEXT NOT NULL,
-    [ccn_ip] TEXT NOT NULL,
+    [user] TEXT NOT NULL,
+    [token] TEXT UNIQUE NOT NULL,
+    [token_expire_on] BIGINT NOT NULL,
+    [ua] TEXT NOT NULL,
+    [ip] TEXT NOT NULL,
 
-    FOREIGN KEY (ccn_user) REFERENCES user(ccn_name) ON DELETE CASCADE
+    FOREIGN KEY (user) REFERENCES user(name) ON DELETE CASCADE
 );
 
 CREATE TABLE collection(
-    [ccn_uuid] TEXT NOT NULL,
-    [ccn_name] TEXT NOT NULL,
-    [ccn_user] TEXT NOT NULL,
-    [ccn_lastChange] TEXT NOT NULL,
+    [uuid] TEXT NOT NULL,
+    [name] TEXT NOT NULL,
+    [user] TEXT NOT NULL,
+    [last_change] TEXT NOT NULL,
 
-    PRIMARY KEY (ccn_uuid),
-    FOREIGN KEY (ccn_user) REFERENCES user(ccn_name) ON DELETE CASCADE
+    PRIMARY KEY (uuid),
+    FOREIGN KEY (user) REFERENCES user(name) ON DELETE CASCADE
 );
 
 CREATE TABLE share(
-    [ccn_uuid] TEXT NOT NULL,
-    [ccn_target] TEXT NOT NULL,
+    [uuid] TEXT NOT NULL,
+    [target] TEXT NOT NULL,
 
-    FOREIGN KEY (ccn_uuid) REFERENCES collection(ccn_uuid) ON DELETE CASCADE
-    FOREIGN KEY (ccn_target) REFERENCES user(ccn_name) ON DELETE CASCADE
+    FOREIGN KEY (uuid) REFERENCES collection(uuid) ON DELETE CASCADE
+    FOREIGN KEY (target) REFERENCES user(name) ON DELETE CASCADE
 );
 
 CREATE TABLE calendar(
-    [ccn_uuid] TEXT NOT NULL,
-    [ccn_belongTo] TEXT NOT NULL,
+    [uuid] TEXT NOT NULL,
+    [belong_to] TEXT NOT NULL,
 
-    [ccn_title] TEXT NOT NULL,
-    [ccn_description] TEXT NOT NULL,
-    [ccn_lastChange] TEXT NOT NULL,
+    [title] TEXT NOT NULL,
+    [description] TEXT NOT NULL,
+    [last_change] TEXT NOT NULL,
 
-    [ccn_eventDateTimeStart] BIGINT NOT NULL,
-    [ccn_eventDateTimeEnd] BIGINT NOT NULL,
-    [ccn_timezoneOffset] INT NOT NULL,
+    [event_date_time_start] BIGINT NOT NULL,
+    [event_date_time_end] BIGINT NOT NULL,
+    [timezone_offset] INT NOT NULL,
     
-    [ccn_loopRules] TEXT NOT NULL,
-    [ccn_loopDateTimeStart] BIGINT NOT NULL,
-    [ccn_loopDateTimeEnd] BIGINT NOT NULL,
+    [loop_rules] TEXT NOT NULL,
+    [loop_date_time_start] BIGINT NOT NULL,
+    [loop_date_time_end] BIGINT NOT NULL,
 
-    PRIMARY KEY (ccn_uuid),
-    FOREIGN KEY (ccn_belongTo) REFERENCES collection(ccn_uuid) ON DELETE CASCADE
+    PRIMARY KEY (uuid),
+    FOREIGN KEY (belong_to) REFERENCES collection(uuid) ON DELETE CASCADE
 );
 
 CREATE TABLE todo(
-    [ccn_uuid] TEXT NOT NULL,
-    [ccn_belongTo] TEXT NOT NULL,
+    [uuid] TEXT NOT NULL,
+    [belong_to] TEXT NOT NULL,
 
-    [ccn_data] TEXT NOT NULL,
-    [ccn_lastChange] TEXT NOT NULL,
+    [data] TEXT NOT NULL,
+    [last_change] TEXT NOT NULL,
 
-    PRIMARY KEY (ccn_uuid),
-    FOREIGN KEY (ccn_belongTo) REFERENCES user(ccn_name) ON DELETE CASCADE
+    PRIMARY KEY (uuid),
+    FOREIGN KEY (belong_to) REFERENCES user(name) ON DELETE CASCADE
 );

backend/utils.py

@@ -3,50 +3,62 @@ import random
 import uuid
 import time
 import math
+import re
 
-ValidUsername = set(map(lambda x:chr(x), range(48, 58, 1))) | set(map(lambda x:chr(x), range(65, 91, 1))) | set(map(lambda x:chr(x), range(97, 123, 1)))
-ValidPassword = set(map(lambda x:chr(x), range(33, 127, 1)))
+USERNAME_PATTERN: re.Pattern = re.compile("^[0-9A-Za-z]+$")
+PASSWORD_PATTERN: re.Pattern = re.compile("^[!-~]+$")
 
-def IsValidUsername(strl):
-    return (len(set(strl) - ValidUsername) == 0)
 
-def IsValidPassword(strl):
-    return (len(set(strl) - ValidPassword) == 0)
+def IsValidUsername(strl: str) -> bool:
+    return USERNAME_PATTERN.match(strl) is not None
 
-def ComputePasswordHash(password):
+
+def IsValidPassword(strl: str) -> bool:
+    return PASSWORD_PATTERN.match(strl) is not None
+
+
+def ComputePasswordHash(password: str) -> str:
     s = hashlib.sha256()
-    s.update(password.encode('utf-8'))
+    s.update(password.encode("utf-8"))
     return s.hexdigest()
 
-def GenerateUUID():
+
+def GenerateUUID() -> str:
     return str(uuid.uuid1())
 
-def GenerateToken(username):
+
+def GenerateToken(username: str) -> str:
     s = hashlib.sha256()
-    s.update(username.encode('utf-8'))
-    s.update(GenerateUUID().encode('utf-8'))
+    s.update(username.encode("utf-8"))
+    s.update(GenerateUUID().encode("utf-8"))
     return s.hexdigest()
 
-def GenerateSalt():
+
+def GenerateSalt() -> int:
     return random.randint(0, 6172748)
 
-def ComputePasswordHashWithSalt(passwordHashed, salt):
+
+def ComputePasswordHashWithSalt(passwordHashed: str, salt: int) -> str:
     s = hashlib.sha256()
-    s.update((passwordHashed + str(salt)).encode('utf-8'))
+    s.update((passwordHashed + str(salt)).encode("utf-8"))
     return s.hexdigest()
 
-def GetCurrentTimestamp():
+
+def GetCurrentTimestamp() -> int:
     return int(time.time())
 
-def GetTokenExpireOn():
+
+def GetTokenExpireOn() -> int:
     return GetCurrentTimestamp() + 60 * 60 * 24 * 2  # add 2 day from now
 
-def Str2Bool(strl):
-    return strl.lower() == 'true'
 
-def GCD(a, b):
+def Str2Bool(strl: str) -> bool:
+    return strl.lower() == "true"
+
+
+def GCD(a: int, b: int) -> int:
     return math.gcd(a, b)
 
-def LCM(a, b):
-    return int(a * b / GCD(a, b))
 
+def LCM(a: int, b: int) -> int:
+    return (a * b) // GCD(a, b)

frontend/.editorconfig

@@ -0,0 +1,8 @@
+[*.{js,jsx,mjs,cjs,ts,tsx,mts,cts,vue,css,scss,sass,less,styl}]
+charset = utf-8
+indent_size = 2
+indent_style = space
+insert_final_newline = true
+trim_trailing_whitespace = true
+end_of_line = lf
+max_line_length = 100

frontend/.gitattributes

@@ -0,0 +1 @@
+* text=auto eol=lf

frontend/.gitignore

@@ -0,0 +1,39 @@
+# Logs
+logs
+*.log
+npm-debug.log*
+yarn-debug.log*
+yarn-error.log*
+pnpm-debug.log*
+lerna-debug.log*
+
+node_modules
+.DS_Store
+dist
+dist-ssr
+coverage
+*.local
+
+# Editor directories and files
+.vscode/*
+!.vscode/extensions.json
+.idea
+*.suo
+*.ntvs*
+*.njsproj
+*.sln
+*.sw?
+
+*.tsbuildinfo
+
+.eslintcache
+
+# Cypress
+/cypress/videos/
+/cypress/screenshots/
+
+# Vitest
+__screenshots__/
+
+# Vite
+*.timestamp-*-*.mjs

frontend/.oxlintrc.json

@@ -0,0 +1,10 @@
+{
+  "$schema": "./node_modules/oxlint/configuration_schema.json",
+  "plugins": ["eslint", "typescript", "unicorn", "oxc", "vue"],
+  "env": {
+    "browser": true
+  },
+  "categories": {
+    "correctness": "error"
+  }
+}

frontend/README.md

@@ -0,0 +1,48 @@
+# coleaf-frontend
+
+This template should help get you started developing with Vue 3 in Vite.
+
+## Recommended IDE Setup
+
+[VS Code](https://code.visualstudio.com/) + [Vue (Official)](https://marketplace.visualstudio.com/items?itemName=Vue.volar) (and disable Vetur).
+
+## Recommended Browser Setup
+
+- Chromium-based browsers (Chrome, Edge, Brave, etc.):
+  - [Vue.js devtools](https://chromewebstore.google.com/detail/vuejs-devtools/nhdogjmejiglipccpnnnanhbledajbpd)
+  - [Turn on Custom Object Formatter in Chrome DevTools](http://bit.ly/object-formatters)
+- Firefox:
+  - [Vue.js devtools](https://addons.mozilla.org/en-US/firefox/addon/vue-js-devtools/)
+  - [Turn on Custom Object Formatter in Firefox DevTools](https://fxdx.dev/firefox-devtools-custom-object-formatters/)
+
+## Type Support for `.vue` Imports in TS
+
+TypeScript cannot handle type information for `.vue` imports by default, so we replace the `tsc` CLI with `vue-tsc` for type checking. In editors, we need [Volar](https://marketplace.visualstudio.com/items?itemName=Vue.volar) to make the TypeScript language service aware of `.vue` types.
+
+## Customize configuration
+
+See [Vite Configuration Reference](https://vite.dev/config/).
+
+## Project Setup
+
+```sh
+pnpm install
+```
+
+### Compile and Hot-Reload for Development
+
+```sh
+pnpm dev
+```
+
+### Type-Check, Compile and Minify for Production
+
+```sh
+pnpm build
+```
+
+### Lint with [ESLint](https://eslint.org/)
+
+```sh
+pnpm lint
+```

frontend/env.d.ts

@@ -0,0 +1 @@
+/// <reference types="vite/client" />

frontend/eslint.config.ts

@@ -0,0 +1,23 @@
+import { globalIgnores } from 'eslint/config'
+import { defineConfigWithVueTs, vueTsConfigs } from '@vue/eslint-config-typescript'
+import pluginVue from 'eslint-plugin-vue'
+import pluginOxlint from 'eslint-plugin-oxlint'
+
+// To allow more languages other than `ts` in `.vue` files, uncomment the following lines:
+// import { configureVueProject } from '@vue/eslint-config-typescript'
+// configureVueProject({ scriptLangs: ['ts', 'tsx'] })
+// More info at https://github.com/vuejs/eslint-config-typescript/#advanced-setup
+
+export default defineConfigWithVueTs(
+  {
+    name: 'app/files-to-lint',
+    files: ['**/*.{vue,ts,mts,tsx}'],
+  },
+
+  globalIgnores(['**/dist/**', '**/dist-ssr/**', '**/coverage/**']),
+
+  ...pluginVue.configs['flat/essential'],
+  vueTsConfigs.recommended,
+
+  ...pluginOxlint.buildFromOxlintConfigFile('.oxlintrc.json'),
+)

frontend/index.html

@@ -0,0 +1,16 @@
+<!DOCTYPE html>
+<html lang="">
+
+<head>
+  <meta charset="UTF-8">
+  <link rel="icon" href="/favicon.ico">
+  <meta name="viewport" content="width=device-width, initial-scale=1.0">
+  <title>coconut-leaf</title>
+</head>
+
+<body>
+  <div id="app"></div>
+  <script type="module" src="/src/main.ts"></script>
+</body>
+
+</html>

frontend/package.json

@@ -0,0 +1,47 @@
+{
+  "name": "coleaf-frontend",
+  "version": "2.0.0",
+  "private": true,
+  "type": "module",
+  "scripts": {
+    "dev": "vite",
+    "build": "run-p type-check \"build-only {@}\" --",
+    "preview": "vite preview",
+    "build-only": "vite build",
+    "type-check": "vue-tsc --build",
+    "lint": "run-s lint:*",
+    "lint:oxlint": "oxlint . --fix",
+    "lint:eslint": "eslint . --fix --cache"
+  },
+  "dependencies": {
+    "@fortawesome/fontawesome-svg-core": "^7.2.0",
+    "@fortawesome/free-solid-svg-icons": "^7.2.0",
+    "@fortawesome/vue-fontawesome": "^3.2.0",
+    "axios": "1.14.0",
+    "bulma": "0.9.1",
+    "pinia": "^3.0.4",
+    "pinia-plugin-persistedstate": "^4.7.1",
+    "vue": "^3.5.32",
+    "vue-router": "^5.0.4"
+  },
+  "devDependencies": {
+    "@tsconfig/node24": "^24.0.4",
+    "@types/node": "^24.12.2",
+    "@vitejs/plugin-vue": "^6.0.6",
+    "@vue/eslint-config-typescript": "^14.7.0",
+    "@vue/tsconfig": "^0.9.1",
+    "eslint": "^10.2.1",
+    "eslint-plugin-oxlint": "~1.60.0",
+    "eslint-plugin-vue": "~10.8.0",
+    "jiti": "^2.6.1",
+    "npm-run-all2": "^8.0.4",
+    "oxlint": "~1.60.0",
+    "typescript": "~6.0.0",
+    "vite": "^8.0.8",
+    "vite-plugin-vue-devtools": "^8.1.1",
+    "vue-tsc": "^3.2.6"
+  },
+  "engines": {
+    "node": "^20.19.0 || >=22.12.0"
+  }
+}

frontend/public/index.scss

@@ -0,0 +1,40 @@
+// 导入 Bulma
+@charset "utf-8";
+@import "bulma/bulma.sass";
+
+// coconut-leaf 全局样式
+
+// 卡片样式（作用于集合列表，Todo列表项等）
+div.paperbox-item {
+  display: flex;
+  flex-flow: row;
+  align-items: flex-start;
+
+  padding: 1.25rem;
+  margin-bottom: 1.25rem;
+}
+
+div.paperbox-item-words {
+  flex-grow: 1;
+  flex-basis: 0;
+
+  word-break: break-all;
+}
+
+div.paperbox-item-icon {
+  margin-left: 0.75rem;
+}
+
+// 按钮列表样式
+
+div.button-list {
+  display: flex;
+  flex-flow: row;
+  flex-wrap: wrap;
+}
+
+div.button-list>* {
+  margin-right: 0.75rem;
+  margin-bottom: 0.75rem;
+  margin-left: 0 !important;
+}

frontend/src/App.vue

@@ -0,0 +1,92 @@
+<script setup lang="ts">
+import { ref } from 'vue';
+import { useLanguageStore } from './stores/language';
+import { useTokenStore } from './stores/token';
+import MessageBox from '@/components/MessageBox.vue';
+import { logout as apiCommonLogout } from './api/common';
+import { goToHome } from '@/router';
+
+const language = useLanguageStore();
+const token = useTokenStore();
+
+const isBurgerActive = ref<boolean>(false);
+
+const messagebox = ref<InstanceType<typeof MessageBox>>();
+
+const logout = async () => {
+  const tokenStore = useTokenStore();
+  const rv = await apiCommonLogout(tokenStore.currentToken);
+  if (rv) {
+    // OK. We logged out.
+    // Clear token.
+    tokenStore.logout();
+    // And go to Home page
+    goToHome();
+  } else {
+    // Show logout error.
+    messagebox.value?.show("Fail to logout due to unknow reason. Consider refreshing page to solve problem.");
+  }
+}
+
+// Process burger menu.
+// This is copied from Bulma website and modified for Vue.
+// Check for click events on the navbar burger icon
+const toggleBurger = () => {
+  // Toggle the "is-active" class on both the "navbar-burger" and the "navbar-menu"
+  isBurgerActive.value = !isBurgerActive.value
+}
+
+</script>
+
+<template>
+  <nav class="navbar has-shadow is-spaced bd-navbar" role="navigation" aria-label="main navigation">
+    <div class="navbar-brand">
+      <router-link class="navbar-item" to="/">
+        <img src="/favicon.ico"><b style="margin:0 0 0 14px;">coconut-leaf</b>
+      </router-link>
+
+      <a role="button" class="navbar-burger burger" :class="{ 'is-active': isBurgerActive }" @click="toggleBurger"
+        aria-label="menu" aria-expanded="false" data-target="coleaf-navbar">
+        <span aria-hidden="true"></span>
+        <span aria-hidden="true"></span>
+        <span aria-hidden="true"></span>
+      </a>
+    </div>
+
+    <div id="coleaf-navbar" class="navbar-menu" :class="{ 'is-active': isBurgerActive }">
+      <div class="navbar-start">
+        <router-link class="navbar-item" to="/home">Home</router-link>
+        <router-link v-if="token.isLoggedIn" class="navbar-item" to="/collection">Collection</router-link>
+        <router-link v-if="token.isLoggedIn" class="navbar-item" to="/calendar">Calendar</router-link>
+        <router-link v-if="token.isLoggedIn" class="navbar-item" to="/todo">Todo</router-link>
+        <router-link v-if="token.isLoggedIn" class="navbar-item" to="/admin">Admin</router-link>
+      </div>
+
+      <div class="navbar-end">
+        <p class="navbar-item">
+          <router-link v-if="!token.isLoggedIn" class="button is-primary" to="/login">Login</router-link>
+        </p>
+        <p class="navbar-item">
+          <a v-if="token.isLoggedIn" class="button is-primary" @click="logout">Logout</a>
+        </p>
+
+        <div class="navbar-item has-dropdown is-hoverable">
+          <a v-if="language.isEnglish" class="navbar-link">English</a>
+          <a v-else-if="language.isSimplifiedChinese" class="navbar-link">简体中文</a>
+
+          <div class="navbar-dropdown">
+            <a @click="language.changeToEnglish()" class="navbar-item">English</a>
+            <a @click="language.changeToSimplifiedChinese()" class="navbar-item">简体中文</a>
+          </div>
+        </div>
+      </div>
+    </div>
+  </nav>
+
+  <!-- The output result of router -->
+  <router-view></router-view>
+
+  <MessageBox ref="messagebox" />
+</template>
+
+<style scoped></style>

frontend/src/api/admin.ts

@@ -0,0 +1,63 @@
+import { apiWrapper, boolApiWrapper } from './index';
+
+/** A raw admin user row as returned by the API (positional from SQL columns) */
+export type AdminUserRow = [
+  name: string,
+  isAdmin: boolean,
+];
+
+/**
+ * Fetch all users (admin only).
+ *
+ * @param token - The auth token (must belong to an admin user)
+ * @returns An array of {@link AdminUserRow} on success, or `undefined` on failure
+ */
+export async function get(token: string): Promise<AdminUserRow[] | undefined> {
+  return apiWrapper<AdminUserRow[]>('/api/admin/get', { token });
+}
+
+/**
+ * Create a new user (admin only).
+ *
+ * @param token - The auth token (must belong to an admin user)
+ * @param username - The new username
+ * @returns A single {@link AdminUserRow} of the newly created user on success, or `undefined` on failure
+ */
+export async function add(token: string, username: string): Promise<AdminUserRow | undefined> {
+  return apiWrapper<AdminUserRow>('/api/admin/add', { token, username });
+}
+
+/**
+ * Update an existing user's password and/or admin status (admin only).
+ *
+ * @param token - The auth token (must belong to an admin user)
+ * @param username - The target user's username
+ * @param password - (optional) The new password (plaintext, will be hashed server-side)
+ * @param isAdmin - (optional) Whether the user should be an admin
+ * @returns `true` on success, `false` on failure (or if no changes were provided)
+ */
+export async function update(
+  token: string,
+  username: string,
+  password?: string,
+  isAdmin?: boolean,
+): Promise<boolean> {
+  const data: Record<string, any> = { token, username };
+  if (password !== undefined) data.password = password;
+  if (isAdmin !== undefined) data.isAdmin = isAdmin;
+
+  if (Object.keys(data).length <= 2) return false;
+
+  return boolApiWrapper('/api/admin/update', data);
+}
+
+/**
+ * Delete a user (admin only).
+ *
+ * @param token - The auth token (must belong to an admin user)
+ * @param username - The username to delete
+ * @returns `true` on success, `false` on failure
+ */
+export async function del(token: string, username: string): Promise<boolean> {
+  return boolApiWrapper('/api/admin/delete', { token, username });
+}

frontend/src/api/calendar.ts

@@ -0,0 +1,172 @@
+import { apiWrapper, boolApiWrapper } from './index';
+
+/** A raw calendar row as returned by the API (positional from SQL columns) */
+export type CalendarRow = [
+  uuid: string,
+  belongTo: string,
+  title: string,
+  description: string,
+  lastChange: string,
+  eventDateTimeStart: number,
+  eventDateTimeEnd: number,
+  timezoneOffset: number,
+  loopRules: string,
+  loopDateTimeStart: number,
+  loopDateTimeEnd: number,
+];
+
+/** Serialized description object stored in the `description` column */
+export interface CalendarDescription {
+  description: string;
+  color: string;
+}
+
+/** Default color used when deserialization fails */
+const DEFAULT_COLOR = '#3388ff';
+
+/**
+ * Serialize a calendar description and color into a JSON string
+ * for storage in the `description` column.
+ *
+ * @param description - The description text
+ * @param color - The color string (e.g. `#ff0000`)
+ * @returns The JSON-serialized string
+ */
+export function serializeDescription(description: string, color: string): string {
+  return JSON.stringify({ description, color });
+}
+
+/**
+ * Deserialize a JSON description string back into an object.
+ * Returns a default object on parse errors.
+ *
+ * @param str - The JSON string to deserialize
+ * @returns The parsed {@link CalendarDescription} object
+ */
+export function deserializeDescription(str: string): CalendarDescription {
+  try {
+    return JSON.parse(str) as CalendarDescription;
+  } catch {
+    return { description: '', color: DEFAULT_COLOR };
+  }
+}
+
+/**
+ * Fetch all calendar events within the given time range for the current user.
+ *
+ * @param token - The auth token
+ * @param startDateTime - Start of the time range (unix timestamp)
+ * @param endDateTime - End of the time range (unix timestamp)
+ * @returns An array of {@link CalendarRow} on success, or `undefined` on failure
+ */
+export async function getFull(token: string, startDateTime: number, endDateTime: number): Promise<CalendarRow[] | undefined> {
+  return apiWrapper<CalendarRow[]>('/api/calendar/getFull', {
+    token,
+    startDateTime,
+    endDateTime,
+  });
+}
+
+/**
+ * Fetch the full detail of a single calendar event by UUID.
+ *
+ * @param token - The auth token
+ * @param uuid - The event UUID
+ * @returns A single {@link CalendarRow} on success, or `undefined` on failure
+ */
+export async function getDetail(token: string, uuid: string): Promise<CalendarRow | undefined> {
+  return apiWrapper<CalendarRow>('/api/calendar/getDetail', {
+    token,
+    uuid,
+  });
+}
+
+/**
+ * Update an existing calendar event. Only the fields provided will be updated.
+ *
+ * @param token - The auth token
+ * @param uuid - The event UUID
+ * @param lastChange - The last known `lastChange` value (optimistic concurrency)
+ * @param belongTo - (optional) Collection UUID this event belongs to
+ * @param title - (optional) Event title
+ * @param description - (optional) Event description (serialized JSON)
+ * @param eventDateTimeStart - (optional) Start time (unix timestamp)
+ * @param eventDateTimeEnd - (optional) End time (unix timestamp)
+ * @param loopRules - (optional) Loop rules string
+ * @param timezoneOffset - (optional) Timezone offset in minutes
+ * @returns The new `lastChange` value on success, or `undefined` on failure
+ */
+export async function update(
+  token: string,
+  uuid: string,
+  lastChange: string,
+  belongTo?: string,
+  title?: string,
+  description?: string,
+  eventDateTimeStart?: number,
+  eventDateTimeEnd?: number,
+  loopRules?: string,
+  timezoneOffset?: number,
+): Promise<string | undefined> {
+  const data: Record<string, any> = { token, uuid, lastChange };
+  if (belongTo !== undefined) data.belongTo = belongTo;
+  if (title !== undefined) data.title = title;
+  if (description !== undefined) data.description = description;
+  if (eventDateTimeStart !== undefined) data.eventDateTimeStart = eventDateTimeStart;
+  if (eventDateTimeEnd !== undefined) data.eventDateTimeEnd = eventDateTimeEnd;
+  if (loopRules !== undefined) data.loopRules = loopRules;
+  if (timezoneOffset !== undefined) data.timezoneOffset = timezoneOffset;
+
+  return apiWrapper<string>('/api/calendar/update', data);
+}
+
+/**
+ * Create a new calendar event.
+ *
+ * @param token - The auth token
+ * @param belongTo - Collection UUID this event belongs to
+ * @param title - Event title
+ * @param description - Event description (serialized JSON)
+ * @param eventDateTimeStart - Start time (unix timestamp)
+ * @param eventDateTimeEnd - End time (unix timestamp)
+ * @param loopRules - Loop rules string
+ * @param timezoneOffset - Timezone offset in minutes
+ * @returns The new event UUID on success, or `undefined` on failure
+ */
+export async function add(
+  token: string,
+  belongTo: string,
+  title: string,
+  description: string,
+  eventDateTimeStart: number,
+  eventDateTimeEnd: number,
+  loopRules: string,
+  timezoneOffset: number,
+): Promise<string | undefined> {
+  return apiWrapper<string>('/api/calendar/add', {
+    token,
+    belongTo,
+    title,
+    description,
+    eventDateTimeStart,
+    eventDateTimeEnd,
+    loopRules,
+    timezoneOffset,
+  });
+}
+
+/**
+ * Delete a calendar event.
+ *
+ * @param token - The auth token
+ * @param uuid - The event UUID
+ * @param lastChange - The last known `lastChange` value (optimistic concurrency)
+ * @returns `true` on success, `false` on failure
+ */
+export async function del(token: string, uuid: string, lastChange: string): Promise<boolean> {
+  return boolApiWrapper('/api/calendar/delete', {
+    token,
+    uuid,
+    lastChange,
+  });
+}

frontend/src/api/collection.ts

@@ -0,0 +1,119 @@
+import { apiWrapper, boolApiWrapper } from './index';
+
+/** A raw collection row as returned by the API (positional from SQL columns) */
+export type CollectionRow = [
+  uuid: string,
+  name: string,
+  lastChange: string,
+];
+
+/** A raw shared collection row as returned by the API */
+export type SharedCollectionRow = [
+  uuid: string,
+  name: string,
+  user: string,
+];
+
+/**
+ * Fetch all collections owned by the current user.
+ *
+ * @param token - The auth token
+ * @returns An array of {@link CollectionRow} on success, or `undefined` on failure
+ */
+export async function getFullOwn(token: string): Promise<CollectionRow[] | undefined> {
+  return apiWrapper<CollectionRow[]>('/api/collection/getFullOwn', { token });
+}
+
+/**
+ * Fetch the detail of a single owned collection by UUID.
+ *
+ * @param token - The auth token
+ * @param uuid - The collection UUID
+ * @returns A single {@link CollectionRow} on success, or `undefined` on failure
+ */
+export async function getDetailOwn(token: string, uuid: string): Promise<CollectionRow | undefined> {
+  return apiWrapper<CollectionRow>('/api/collection/getDetailOwn', { token, uuid });
+}
+
+/**
+ * Create a new collection.
+ *
+ * @param token - The auth token
+ * @param name - The collection name
+ * @returns The new collection UUID on success, or `undefined` on failure
+ */
+export async function addOwn(token: string, name: string): Promise<string | undefined> {
+  return apiWrapper<string>('/api/collection/addOwn', { token, name });
+}
+
+/**
+ * Update an existing collection's name.
+ *
+ * @param token - The auth token
+ * @param uuid - The collection UUID
+ * @param name - The new collection name
+ * @param lastChange - The last known `lastChange` value (optimistic concurrency)
+ * @returns The new `lastChange` value on success, or `undefined` on failure
+ */
+export async function updateOwn(token: string, uuid: string, name: string, lastChange: string): Promise<string | undefined> {
+  return apiWrapper<string>('/api/collection/updateOwn', { token, uuid, name, lastChange });
+}
+
+/**
+ * Delete an owned collection.
+ *
+ * @param token - The auth token
+ * @param uuid - The collection UUID
+ * @param lastChange - The last known `lastChange` value (optimistic concurrency)
+ * @returns `true` on success, `false` on failure
+ */
+export async function deleteOwn(token: string, uuid: string, lastChange: string): Promise<boolean> {
+  return boolApiWrapper('/api/collection/deleteOwn', { token, uuid, lastChange });
+}
+
+/**
+ * Fetch all users this collection is shared with.
+ *
+ * @param token - The auth token
+ * @param uuid - The collection UUID
+ * @returns An array of target usernames on success, or `undefined` on failure
+ */
+export async function getSharing(token: string, uuid: string): Promise<string[] | undefined> {
+  return apiWrapper<string[]>('/api/collection/getSharing', { token, uuid });
+}
+
+/**
+ * Remove a sharing target from a collection.
+ *
+ * @param token - The auth token
+ * @param uuid - The collection UUID
+ * @param target - The username to unshare with
+ * @param lastChange - The last known `lastChange` value (optimistic concurrency)
+ * @returns The new `lastChange` value on success, or `undefined` on failure
+ */
+export async function deleteSharing(token: string, uuid: string, target: string, lastChange: string): Promise<string | undefined> {
+  return apiWrapper<string>('/api/collection/deleteSharing', { token, uuid, target, lastChange });
+}
+
+/**
+ * Add a sharing target to a collection.
+ *
+ * @param token - The auth token
+ * @param uuid - The collection UUID
+ * @param target - The username to share with
+ * @param lastChange - The last known `lastChange` value (optimistic concurrency)
+ * @returns The new `lastChange` value on success, or `undefined` on failure
+ */
+export async function addSharing(token: string, uuid: string, target: string, lastChange: string): Promise<string | undefined> {
+  return apiWrapper<string>('/api/collection/addSharing', { token, uuid, target, lastChange });
+}
+
+/**
+ * Fetch all collections shared with the current user.
+ *
+ * @param token - The auth token
+ * @returns An array of {@link SharedCollectionRow} on success, or `undefined` on failure
+ */
+export async function getShared(token: string): Promise<SharedCollectionRow[] | undefined> {
+  return apiWrapper<SharedCollectionRow[]>('/api/collection/getShared', { token });
+}

frontend/src/api/common.ts

@@ -0,0 +1,59 @@
+import { apiWrapper, boolApiWrapper } from './index';
+
+// /**
+//  * Login via salt-challenge mechanism.
+//  *
+//  * First fetches a salt from the server, then computes the salted password hash
+//  * and sends it to complete login. Returns the auth token on success.
+//  *
+//  * @param username - The username
+//  * @param password - The plaintext password
+//  * @returns The auth token string on success, or `undefined` on failure
+//  */
+// export async function login(username: string, password: string): Promise<string | undefined> {
+//   const salt = await apiWrapper<number>('/api/common/salt', { username });
+//   if (salt === undefined) return undefined;
+
+//   const token = await apiWrapper<string>('/api/common/login', {
+//     username,
+//     password: ComputePasswordWithSalt(password, salt.toString()),
+//   });
+
+//   return token;
+// }
+
+/**
+ * Web login using password hash comparison (no salt challenge).
+ *
+ * @param username - The username
+ * @param password - The plaintext password
+ * @returns The auth token string on success, or `undefined` on failure
+ */
+export async function webLogin(username: string, password: string): Promise<string | undefined> {
+  const token = await apiWrapper<string>('/api/common/webLogin', {
+    username,
+    password,
+  });
+
+  return token;
+}
+
+/**
+ * Logout and invalidate the given token on the server.
+ *
+ * @param token - The auth token to invalidate
+ * @returns `true` on success, `false` on failure
+ */
+export async function logout(token: string): Promise<boolean> {
+  return boolApiWrapper('/api/common/logout', { token });
+}
+
+/**
+ * Check whether the given token is still valid.
+ *
+ * @param token - The auth token to validate
+ * @returns `true` if the token is valid, `false` otherwise
+ */
+export async function tokenValid(token: string): Promise<boolean> {
+  return boolApiWrapper('/api/common/tokenValid', { token });
+}

frontend/src/api/index.ts

@@ -0,0 +1,64 @@
+/** Response interface for all API calls */
+export interface ApiResponse<T = any> {
+  success: boolean;
+  error: string;
+  data: T;
+}
+
+/**
+ * Generic API wrapper that performs a POST request with URL-encoded form data.
+ * Returns the `data` field on success, or `undefined` on failure.
+ *
+ * @param url - The API endpoint URL
+ * @param data - Key-value pairs to send as form data
+ * @returns The response data on success, or `undefined` on failure
+ */
+export async function apiWrapper<T>(url: string, data: Record<string, any>): Promise<T | undefined> {
+  try {
+    const params = new URLSearchParams();
+    Object.entries(data).forEach(([key, value]) => {
+      params.append(key, String(value));
+    });
+    const response = await fetch(url, {
+      method: "POST",
+      mode: "cors",
+      cache: "no-cache",
+      credentials: "same-origin",
+      headers: {
+        'Content-Type': 'application/x-www-form-urlencoded',
+      },
+      redirect: "follow",
+      referrerPolicy: "no-referrer",
+      body: params.toString(),
+    });
+
+    if (!response.ok) {
+      console.error(`HTTP failed: ${response.status}`);
+    }
+
+    const payload = await response.json() as ApiResponse<T>;
+
+    if (payload.success) {
+      return payload.data;
+    } else {
+      console.error(`API failed: ${payload.error}`);
+      return undefined;
+    }
+  } catch (error) {
+    console.error(`Fetch failed: ${error}`);
+    return undefined;
+  }
+}
+
+/**
+ * Boolean API wrapper. Calls {@link apiWrapper} and returns `true` if the
+ * response is not `undefined`, otherwise `false`.
+ *
+ * @param url - The API endpoint URL
+ * @param data - Key-value pairs to send as form data
+ * @returns `true` on success, `false` on failure
+ */
+export async function boolApiWrapper(url: string, data: Record<string, any>): Promise<boolean> {
+  const rv = await apiWrapper<null>(url, data);
+  return rv !== undefined;
+}

frontend/src/api/profile.ts

@@ -0,0 +1,52 @@
+import { apiWrapper, boolApiWrapper } from './index';
+
+/** A raw token row as returned by the API (positional from SQL columns) */
+export type TokenRow = [
+  user: string,
+  token: string,
+  tokenExpireOn: number,
+  ua: string,
+  ip: string,
+];
+
+/**
+ * Check whether the current user is an admin.
+ *
+ * @param token - The auth token
+ * @returns `true` if the user is an admin, `false` otherwise
+ */
+export async function isAdmin(token: string): Promise<boolean> {
+  return boolApiWrapper('/api/profile/isAdmin', { token });
+}
+
+/**
+ * Change the current user's password.
+ *
+ * @param token - The auth token
+ * @param password - The new password (plaintext, will be hashed server-side)
+ * @returns `true` on success, `false` on failure
+ */
+export async function changePassword(token: string, password: string): Promise<boolean> {
+  return boolApiWrapper('/api/profile/changePassword', { token, password });
+}
+
+/**
+ * Fetch all tokens associated with the current user.
+ *
+ * @param token - The auth token
+ * @returns An array of {@link TokenRow} on success, or `undefined` on failure
+ */
+export async function getToken(token: string): Promise<TokenRow[] | undefined> {
+  return apiWrapper<TokenRow[]>('/api/profile/getToken', { token });
+}
+
+/**
+ * Delete a specific token belonging to the current user.
+ *
+ * @param token - The auth token
+ * @param deleteToken - The token string to delete
+ * @returns `true` on success, `false` on failure
+ */
+export async function deleteToken(token: string, deleteToken: string): Promise<boolean> {
+  return boolApiWrapper('/api/profile/deleteToken', { token, deleteToken });
+}

frontend/src/api/todo.ts

@@ -0,0 +1,54 @@
+import { apiWrapper, boolApiWrapper } from './index';
+
+/** A raw todo row as returned by the API (positional from SQL columns) */
+export type TodoRow = [
+  uuid: string,
+  belongTo: string,
+  data: string,
+  lastChange: string,
+];
+
+/**
+ * Fetch all todo items belonging to the current user.
+ *
+ * @param token - The auth token
+ * @returns An array of {@link TodoRow} on success, or `undefined` on failure
+ */
+export async function getFull(token: string): Promise<TodoRow[] | undefined> {
+  return apiWrapper<TodoRow[]>('/api/todo/getFull', { token });
+}
+
+/**
+ * Create a new empty todo item.
+ *
+ * @param token - The auth token
+ * @returns A single {@link TodoRow} of the newly created item on success, or `undefined` on failure
+ */
+export async function add(token: string): Promise<TodoRow | undefined> {
+  return apiWrapper<TodoRow>('/api/todo/add', { token });
+}
+
+/**
+ * Update an existing todo item's data.
+ *
+ * @param token - The auth token
+ * @param uuid - The todo UUID
+ * @param data - The new todo data (serialized string)
+ * @param lastChange - The last known `lastChange` value (optimistic concurrency)
+ * @returns The new `lastChange` value on success, or `undefined` on failure
+ */
+export async function update(token: string, uuid: string, data: string, lastChange: string): Promise<string | undefined> {
+  return apiWrapper<string>('/api/todo/update', { token, uuid, data, lastChange });
+}
+
+/**
+ * Delete a todo item.
+ *
+ * @param token - The auth token
+ * @param uuid - The todo UUID
+ * @param lastChange - The last known `lastChange` value (optimistic concurrency)
+ * @returns `true` on success, `false` on failure
+ */
+export async function del(token: string, uuid: string, lastChange: string): Promise<boolean> {
+  return boolApiWrapper('/api/todo/delete', { token, uuid, lastChange });
+}

frontend/src/components/DateTimePicker.vue

@@ -0,0 +1,673 @@
+<script lang="ts">
+export enum TabType {
+  Year,
+  Month,
+  Day,
+  Hour,
+  Minute
+}
+</script>
+
+<script setup lang="ts">
+import { computed, onMounted, onUnmounted, ref } from 'vue';
+import { FontAwesomeIcon } from '@fortawesome/vue-fontawesome';
+import {
+  MAX_DATETIME,
+  MIN_DATETIME,
+  MIN_YEAR,
+  MAX_YEAR,
+  MONTH_DAY_COUNT,
+  dayOfWeek,
+  isLeapYear
+} from '@/utils/datetime';
+import { MONTH_NAMES, WEEK_NAMES } from '@/utils/calendar-names';
+
+const DIAL_PLATE_WIDTH: number = 200;
+const DIAL_PLATE_RADIUS: number = DIAL_PLATE_WIDTH / 2;
+const DIAL_PLATE_HOUR_INNER_PERCENT: number = 0.6;
+const DIAL_PLATE_HOUR_OUTTER_PERCENT: number = 0.8;
+const DIAL_PLATE_HOUR_DISTINGUISH_PERCENT: number = 0.7;
+const DIAL_PLATE_MINUTE_PERCENT: number = 0.8;
+const DIAL_PLATE_HOUR_RESOLUTION: number = Math.PI * 2 / 12;
+const DIAL_PLATE_MINUTE_RESOLUTION: number = Math.PI * 2 / 60;
+
+const NBSP: string = '\u00A0';
+
+const isVisible = ref(false);
+const currentTab = ref<TabType>(TabType.Year);
+const mode = ref<TabType>(TabType.Day);
+const svgFontScale = ref<number>(1);
+
+let enableHourDrag = false;
+let enableMinuteDrag = false;
+
+const internalDateTime = ref<Date>(new Date());
+const displayCacheDateTime = ref<Date>(new Date());
+
+const pickerContainerRef = ref<HTMLElement>();
+const hourSvgRef = ref<SVGSVGElement>();
+const minuteSvgRef = ref<SVGSVGElement>();
+
+// region: Exported API and Signals
+
+const emit = defineEmits<{
+  (e: 'confirm', date: Date): void
+  (e: 'cancel'): void
+}>();
+
+const clampDateTime = (d: Date): void => {
+  if (d < MIN_DATETIME) d.setTime(MIN_DATETIME.getTime());
+  if (d >= MAX_DATETIME) d.setTime(MAX_DATETIME.getTime());
+};
+
+const switchTab = (newTab: TabType): void => {
+  displayCacheDateTime.value = new Date(internalDateTime.value);
+  currentTab.value = newTab;
+};
+
+const modal = (initialDate: Date, _mode: TabType): void => {
+  mode.value = _mode;
+  const d = new Date(initialDate);
+  clampDateTime(d);
+  internalDateTime.value = new Date(d);
+  displayCacheDateTime.value = new Date(d);
+  isVisible.value = true;
+  switchTab(_mode);
+};
+
+const confirm = (): void => {
+  isVisible.value = false;
+  emit('confirm', new Date(internalDateTime.value));
+};
+
+const cancel = (): void => {
+  isVisible.value = false;
+  emit('cancel');
+};
+
+defineExpose({ modal });
+
+// endregion
+
+// region: Mutator helpers
+// Vue does not track in-place Date mutation, so every change clones, mutates,
+// clamps, and reassigns the ref to trigger reactivity.
+
+const updateDisplay = (mutator: (d: Date) => void): void => {
+  const d = new Date(displayCacheDateTime.value);
+  mutator(d);
+  clampDateTime(d);
+  displayCacheDateTime.value = d;
+};
+
+const updateInternal = (mutator: (d: Date) => void): void => {
+  const d = new Date(internalDateTime.value);
+  mutator(d);
+  clampDateTime(d);
+  internalDateTime.value = d;
+};
+
+// endregion
+
+// region: Computed views (replaces legacy imperative RefreshDisplay)
+
+const visibleTabs = computed<Set<TabType>>(() => {
+  const s = new Set<TabType>();
+  if (mode.value >= TabType.Year) s.add(TabType.Year);
+  if (mode.value >= TabType.Month) s.add(TabType.Month);
+  if (mode.value >= TabType.Day) s.add(TabType.Day);
+  if (mode.value >= TabType.Hour) s.add(TabType.Hour);
+  if (mode.value >= TabType.Minute) s.add(TabType.Minute);
+  return s;
+});
+
+const headerParts = computed(() => ({
+  year: internalDateTime.value.getFullYear(),
+  month: internalDateTime.value.getMonth() + 1,
+  day: internalDateTime.value.getDate(),
+  hour: internalDateTime.value.getHours(),
+  minute: internalDateTime.value.getMinutes(),
+}));
+
+const yearPageStart = computed<number>(() => {
+  const y = displayCacheDateTime.value.getFullYear();
+  return Math.floor((y - MIN_YEAR) / 12) * 12 + MIN_YEAR;
+});
+
+const yearCells = computed<{ value: number | undefined; picked: boolean }[]>(() => {
+  const start = yearPageStart.value;
+  const internalYear = internalDateTime.value.getFullYear();
+  const cells: { value: number | undefined; picked: boolean }[] = [];
+  for (let i = 0; i < 12; i++) {
+    const counter = start + i;
+    if (counter < MAX_YEAR) {
+      cells.push({ value: counter, picked: counter === internalYear });
+    } else {
+      cells.push({ value: undefined, picked: false });
+    }
+  }
+  return cells;
+});
+
+const yearRows = computed<{ value: number | undefined; picked: boolean }[][]>(() => {
+  const cells = yearCells.value;
+  const rows: { value: number | undefined; picked: boolean }[][] = [];
+  for (let i = 0; i < 3; i++) rows.push(cells.slice(i * 4, i * 4 + 4));
+  return rows;
+});
+
+const yearTitle = computed<string>(() => {
+  const start = yearPageStart.value;
+  return `${start} - ${Math.min(start + 12, MAX_YEAR)}`;
+});
+
+const pickedMonthIndex = computed<number>(() => {
+  if (internalDateTime.value.getFullYear() === displayCacheDateTime.value.getFullYear()) {
+    return internalDateTime.value.getMonth();
+  }
+  return -1;
+});
+
+const monthCells = computed<{ index: number; name: string; picked: boolean }[]>(() => {
+  const picked = pickedMonthIndex.value;
+  const cells: { index: number; name: string; picked: boolean }[] = [];
+  for (let i = 0; i < 12; i++) {
+    cells.push({ index: i, name: MONTH_NAMES[i]!, picked: i === picked });
+  }
+  return cells;
+});
+
+const monthRows = computed<{ index: number; name: string; picked: boolean }[][]>(() => {
+  const cells = monthCells.value;
+  const rows: { index: number; name: string; picked: boolean }[][] = [];
+  for (let i = 0; i < 3; i++) rows.push(cells.slice(i * 4, i * 4 + 4));
+  return rows;
+});
+
+const monthTitle = computed<number>(() => displayCacheDateTime.value.getFullYear());
+
+const dayGrid = computed<{ value: number | undefined; picked: boolean }[][]>(() => {
+  const y = displayCacheDateTime.value.getFullYear();
+  const m = displayCacheDateTime.value.getMonth() + 1;
+  const firstDow = dayOfWeek(y, m, 1);
+  const daysInMonth = MONTH_DAY_COUNT[m - 1]! + (m === 2 && isLeapYear(y) ? 1 : 0);
+  const internalDay = internalDateTime.value.getDate();
+  const rows: { value: number | undefined; picked: boolean }[][] = [];
+  let counter = -firstDow;
+  for (let i = 0; i < 6; i++) {
+    const row: { value: number | undefined; picked: boolean }[] = [];
+    for (let j = 0; j < 7; j++, counter++) {
+      if (counter < 0 || counter >= daysInMonth) {
+        row.push({ value: undefined, picked: false });
+      } else {
+        const dayNum = counter + 1;
+        row.push({ value: dayNum, picked: dayNum === internalDay });
+      }
+    }
+    rows.push(row);
+  }
+  return rows;
+});
+
+const dayTitle = computed<string>(() => {
+  const y = displayCacheDateTime.value.getFullYear();
+  const m = displayCacheDateTime.value.getMonth();
+  return `${y} - ${MONTH_NAMES[m]!}`;
+});
+
+const hourHand = computed(() => {
+  const h = displayCacheDateTime.value.getHours();
+  const angle = (3 - h) * DIAL_PLATE_HOUR_RESOLUTION;
+  const radius = DIAL_PLATE_RADIUS * (h < 12 ? DIAL_PLATE_HOUR_OUTTER_PERCENT : DIAL_PLATE_HOUR_INNER_PERCENT);
+  const x = Math.cos(angle) * radius + DIAL_PLATE_RADIUS;
+  const y = (-Math.sin(angle) * radius) + DIAL_PLATE_RADIUS;
+  return { x2: x, y2: y, cx: x, cy: y };
+});
+
+const minuteHand = computed(() => {
+  const mi = displayCacheDateTime.value.getMinutes();
+  const angle = (15 - mi) * DIAL_PLATE_MINUTE_RESOLUTION;
+  const radius = DIAL_PLATE_RADIUS * DIAL_PLATE_MINUTE_PERCENT;
+  const x = Math.cos(angle) * radius + DIAL_PLATE_RADIUS;
+  const y = (-Math.sin(angle) * radius) + DIAL_PLATE_RADIUS;
+  return { x2: x, y2: y, cx: x, cy: y };
+});
+
+// endregion
+
+// region: Navigation and click handlers
+
+const prevNextYear = (isPrev: boolean): void => {
+  updateDisplay((d) => d.setFullYear(d.getFullYear() + (isPrev ? -12 : 12)));
+};
+
+// NOTE: legacy PrevNextMonth actually shifts the YEAR (the month panel browses years).
+const prevNextMonth = (isPrev: boolean): void => {
+  updateDisplay((d) => d.setFullYear(d.getFullYear() + (isPrev ? -1 : 1)));
+};
+
+// NOTE: legacy PrevNextDay actually shifts the MONTH (the day panel browses months).
+const prevNextDay = (isPrev: boolean): void => {
+  updateDisplay((d) => d.setMonth(d.getMonth() + (isPrev ? -1 : 1)));
+};
+
+const clickYear = (value: number | undefined): void => {
+  if (value === undefined) return;
+  updateInternal((d) => d.setFullYear(value));
+  if (mode.value !== TabType.Year) switchTab(TabType.Month);
+};
+
+const clickMonth = (monthIndex: number): void => {
+  updateInternal((d) => {
+    d.setFullYear(displayCacheDateTime.value.getFullYear());
+    d.setMonth(monthIndex);
+  });
+  if (mode.value !== TabType.Month) switchTab(TabType.Day);
+};
+
+const clickDay = (day: number | undefined): void => {
+  if (day === undefined) return;
+  updateInternal((d) => {
+    d.setFullYear(displayCacheDateTime.value.getFullYear());
+    d.setMonth(displayCacheDateTime.value.getMonth());
+    d.setDate(day);
+  });
+  if (mode.value !== TabType.Day) switchTab(TabType.Hour);
+};
+
+// endregion
+
+// region: Dial drag interaction
+
+const getUniformedXY = (e: MouseEvent | TouchEvent, el: Element): { x: number; y: number } => {
+  const rect = el.getBoundingClientRect();
+  const halfWidth = rect.width / 2;
+  const halfHeight = rect.height / 2;
+  const halfSquare = Math.min(rect.width, rect.height) / 2;
+  let clientX = 0;
+  let clientY = 0;
+  const te = e as TouchEvent;
+  const me = e as MouseEvent;
+  if (te.targetTouches && te.targetTouches.length >= 1) {
+    clientX = te.targetTouches[0]!.clientX;
+    clientY = te.targetTouches[0]!.clientY;
+  } else {
+    clientX = me.clientX;
+    clientY = me.clientY;
+  }
+  const x = ((clientX - rect.left - halfWidth) / halfSquare) * DIAL_PLATE_RADIUS;
+  const y = -(((clientY - rect.top - halfHeight) / halfSquare) * DIAL_PLATE_RADIUS);
+  return { x, y };
+};
+
+const startDragHour = (): void => { enableHourDrag = true; };
+const draggingHour = (e: MouseEvent | TouchEvent): void => {
+  if (!enableHourDrag || !hourSvgRef.value) return;
+  const { x, y } = getUniformedXY(e, hourSvgRef.value);
+  const distance = Math.sqrt(x * x + y * y);
+  let angle = Math.acos(x / distance);
+  if (y < 0) angle = Math.PI * 2 - angle;
+  angle += DIAL_PLATE_HOUR_RESOLUTION / 2;
+  if (angle > Math.PI * 2) angle -= Math.PI * 2;
+  let number = Math.floor(angle / DIAL_PLATE_HOUR_RESOLUTION);
+  if (number >= 12) number = 11;
+  number = (15 - number) % 12;
+  if (distance < DIAL_PLATE_RADIUS * DIAL_PLATE_HOUR_DISTINGUISH_PERCENT) number += 12;
+  if (displayCacheDateTime.value.getHours() !== number) {
+    updateDisplay((d) => d.setHours(number));
+  }
+  e.preventDefault();
+};
+const stopDragHour = (): void => {
+  enableHourDrag = false;
+  updateInternal((d) => d.setHours(displayCacheDateTime.value.getHours()));
+  if (mode.value !== TabType.Hour) switchTab(TabType.Minute);
+};
+
+const startDragMinute = (): void => { enableMinuteDrag = true; };
+const draggingMinute = (e: MouseEvent | TouchEvent): void => {
+  if (!enableMinuteDrag || !minuteSvgRef.value) return;
+  const { x, y } = getUniformedXY(e, minuteSvgRef.value);
+  const distance = Math.sqrt(x * x + y * y);
+  let angle = Math.acos(x / distance);
+  if (y < 0) angle = Math.PI * 2 - angle;
+  angle += DIAL_PLATE_MINUTE_RESOLUTION / 2;
+  if (angle > Math.PI * 2) angle -= Math.PI * 2;
+  let number = Math.floor(angle / DIAL_PLATE_MINUTE_RESOLUTION);
+  if (number >= 60) number = 59;
+  number = (75 - number) % 60;
+  if (displayCacheDateTime.value.getMinutes() !== number) {
+    updateDisplay((d) => d.setMinutes(number));
+  }
+  e.preventDefault();
+};
+const stopDragMinute = (): void => {
+  enableMinuteDrag = false;
+  updateInternal((d) => d.setMinutes(displayCacheDateTime.value.getMinutes()));
+};
+
+// endregion
+
+// region: Lifecycle - SVG font-size scaling
+
+let resizeObserver: ResizeObserver | null = null;
+
+onMounted(() => {
+  resizeObserver = new ResizeObserver((entries) => {
+    for (const entry of entries) {
+      const w = entry.contentRect.width;
+      const h = entry.contentRect.height;
+      if (w > 0 && h > 0) svgFontScale.value = 200 / Math.min(w, h);
+    }
+  });
+  if (pickerContainerRef.value) resizeObserver.observe(pickerContainerRef.value);
+});
+
+onUnmounted(() => {
+  resizeObserver?.disconnect();
+  resizeObserver = null;
+});
+
+// endregion
+</script>
+
+<template>
+  <div class="modal" :class="{ 'is-active': isVisible }"
+       style="float: left; position: fixed; top: 0; bottom: 0; left: 0; right: 0;">
+    <div class="modal-background"></div>
+    <div class="modal-card" style="height: 70%;">
+      <header class="modal-card-head pickerHeader">
+        <div v-show="visibleTabs.has(TabType.Year)" @click="switchTab(TabType.Year)">
+          <small>Year</small><span>{{ headerParts.year }}</span>
+        </div>
+        <div v-show="visibleTabs.has(TabType.Month)" @click="switchTab(TabType.Month)">
+          <small>Month</small><span>{{ headerParts.month }}</span>
+        </div>
+        <div v-show="visibleTabs.has(TabType.Day)" @click="switchTab(TabType.Day)">
+          <small>Day</small><span>{{ headerParts.day }}</span>
+        </div>
+        <div v-show="visibleTabs.has(TabType.Hour)" @click="switchTab(TabType.Hour)">
+          <small>Hour</small><span>{{ headerParts.hour }}</span>
+        </div>
+        <div v-show="visibleTabs.has(TabType.Minute)" @click="switchTab(TabType.Minute)">
+          <small>Minute</small><span>{{ headerParts.minute }}</span>
+        </div>
+      </header>
+      <div class="modal-card-body pickerContainer" ref="pickerContainerRef">
+        <div v-show="currentTab === TabType.Year">
+          <nav class="level is-mobile">
+            <div class="level-left">
+              <div class="level-item control">
+                <a class="button" @click="prevNextYear(true)">
+                  <span class="icon is-small"><font-awesome-icon icon="fas fa-chevron-circle-left"></font-awesome-icon></span>
+                </a>
+              </div>
+            </div>
+            <div class="level-item">{{ yearTitle }}</div>
+            <div class="level-right">
+              <div class="level-item control">
+                <a class="button" @click="prevNextYear(false)">
+                  <span class="icon is-small"><font-awesome-icon icon="fas fa-chevron-circle-right"></font-awesome-icon></span>
+                </a>
+              </div>
+            </div>
+          </nav>
+
+          <div class="perfectTable">
+            <div v-for="(row, ri) in yearRows" :key="ri">
+              <div v-for="(cell, ci) in row" :key="ci"
+                   :class="{ picked: cell.picked }"
+                   @click="clickYear(cell.value)">{{ cell.value ?? NBSP }}</div>
+            </div>
+          </div>
+        </div>
+
+        <div v-show="currentTab === TabType.Month">
+          <nav class="level is-mobile">
+            <div class="level-left">
+              <div class="level-item control">
+                <a class="button" @click="prevNextMonth(true)">
+                  <span class="icon is-small"><font-awesome-icon icon="fas fa-chevron-circle-left"></font-awesome-icon></span>
+                </a>
+              </div>
+            </div>
+            <div class="level-item">{{ monthTitle }}</div>
+            <div class="level-right">
+              <div class="level-item control">
+                <a class="button" @click="prevNextMonth(false)">
+                  <span class="icon is-small"><font-awesome-icon icon="fas fa-chevron-circle-right"></font-awesome-icon></span>
+                </a>
+              </div>
+            </div>
+          </nav>
+
+          <div class="perfectTable">
+            <div v-for="(row, ri) in monthRows" :key="ri">
+              <div v-for="(cell, ci) in row" :key="ci"
+                   :class="{ picked: cell.picked }"
+                   @click="clickMonth(cell.index)">{{ cell.name }}</div>
+            </div>
+          </div>
+        </div>
+
+        <div v-show="currentTab === TabType.Day">
+          <nav class="level is-mobile">
+            <div class="level-left">
+              <div class="level-item control">
+                <a class="button" @click="prevNextDay(true)">
+                  <span class="icon is-small"><font-awesome-icon icon="fas fa-chevron-circle-left"></font-awesome-icon></span>
+                </a>
+              </div>
+            </div>
+            <div class="level-item">{{ dayTitle }}</div>
+            <div class="level-right">
+              <div class="level-item control">
+                <a class="button" @click="prevNextDay(false)">
+                  <span class="icon is-small"><font-awesome-icon icon="fas fa-chevron-circle-right"></font-awesome-icon></span>
+                </a>
+              </div>
+            </div>
+          </nav>
+
+          <div class="perfectTable">
+            <div>
+              <div v-for="(name, wi) in WEEK_NAMES" :key="wi">{{ name }}</div>
+            </div>
+            <div v-for="(row, ri) in dayGrid" :key="ri">
+              <div v-for="(cell, ci) in row" :key="ci"
+                   :class="{ picked: cell.picked }"
+                   @click="clickDay(cell.value)">{{ cell.value ?? NBSP }}</div>
+            </div>
+          </div>
+        </div>
+
+        <svg v-show="currentTab === TabType.Hour" ref="hourSvgRef"
+             xmlns="http://www.w3.org/2000/svg" version="1.1"
+             preserveAspectRatio="xMidYMid" viewBox="0 0 200 200"
+             :style="{ fontSize: svgFontScale + 'em' }"
+             @mousedown="startDragHour" @mousemove="draggingHour" @mouseup="stopDragHour"
+             @touchstart="startDragHour" @touchmove="draggingHour" @touchend="stopDragHour">
+          <circle cx="100.000000" cy="100.000000" r="100.000000" type="background"></circle>
+          <line x1="100" y1="100" :x2="hourHand.x2" :y2="hourHand.y2"></line>
+          <circle :cx="hourHand.cx" :cy="hourHand.cy" r="1em" type="symbol"></circle>
+
+          <text x="100.000000" y="20.000000">0</text>
+          <text x="140.000000" y="30.717968">1</text>
+          <text x="169.282032" y="60.000000">2</text>
+          <text x="180.000000" y="100.000000">3</text>
+          <text x="169.282032" y="140.000000">4</text>
+          <text x="140.000000" y="169.282032">5</text>
+          <text x="100.000000" y="180.000000">6</text>
+          <text x="60.000000" y="169.282032">7</text>
+          <text x="30.717968" y="140.000000">8</text>
+          <text x="20.000000" y="100.000000">9</text>
+          <text x="30.717968" y="60.000000">10</text>
+          <text x="60.000000" y="30.717968">11</text>
+          <text x="100.000000" y="40.000000">12</text>
+          <text x="130.000000" y="48.038476">13</text>
+          <text x="151.961524" y="70.000000">14</text>
+          <text x="160.000000" y="100.000000">15</text>
+          <text x="151.961524" y="130.000000">16</text>
+          <text x="130.000000" y="151.961524">17</text>
+          <text x="100.000000" y="160.000000">18</text>
+          <text x="70.000000" y="151.961524">19</text>
+          <text x="48.038476" y="130.000000">20</text>
+          <text x="40.000000" y="100.000000">21</text>
+          <text x="48.038476" y="70.000000">22</text>
+          <text x="70.000000" y="48.038476">23</text>
+        </svg>
+
+        <svg v-show="currentTab === TabType.Minute" ref="minuteSvgRef"
+             xmlns="http://www.w3.org/2000/svg" version="1.1"
+             preserveAspectRatio="xMidYMid" viewBox="0 0 200 200"
+             :style="{ fontSize: svgFontScale + 'em' }"
+             @mousedown="startDragMinute" @mousemove="draggingMinute" @mouseup="stopDragMinute"
+             @touchstart="startDragMinute" @touchmove="draggingMinute" @touchend="stopDragMinute">
+          <circle cx="100.000000" cy="100.000000" r="100.000000" type="background"></circle>
+          <line x1="100" y1="100" :x2="minuteHand.x2" :y2="minuteHand.y2"></line>
+          <circle :cx="minuteHand.cx" :cy="minuteHand.cy" r="1em" type="symbol"></circle>
+
+          <text x="100.000000" y="20.000000">0</text>
+          <text x="140.000000" y="30.717968">5</text>
+          <text x="169.282032" y="60.000000">10</text>
+          <text x="180.000000" y="100.000000">15</text>
+          <text x="169.282032" y="140.000000">20</text>
+          <text x="140.000000" y="169.282032">25</text>
+          <text x="100.000000" y="180.000000">30</text>
+          <text x="60.000000" y="169.282032">35</text>
+          <text x="30.717968" y="140.000000">40</text>
+          <text x="20.000000" y="100.000000">45</text>
+          <text x="30.717968" y="60.000000">50</text>
+          <text x="60.000000" y="30.717968">55</text>
+        </svg>
+
+      </div>
+      <footer class="modal-card-foot">
+        <a class="button is-success" @click="confirm">
+          <span>OK</span>
+        </a>
+        <a class="button" @click="cancel">
+          <span>Cancel</span>
+        </a>
+      </footer>
+    </div>
+  </div>
+</template>
+
+<style scoped>
+div.perfectTable {
+  display: flex;
+  flex-flow: column;
+}
+
+/*
+div.perfectTable > div > div:nth-child(1) {
+    border-left: 1px solid black;
+}
+
+div.perfectTable > div:nth-child(1) > div {
+    border-top: 1px solid black;
+}
+*/
+
+div.perfectTable>div>div {
+  /*border-top: 0 solid black;
+    border-left: 0 solid black;
+    border-right: 1px solid black;
+    border-bottom: 1px solid black;
+
+    padding: 0.75em;*/
+
+  flex-grow: 1;
+  flex-basis: 0;
+  flex-shrink: 0;
+
+  overflow: hidden;
+
+  display: flex;
+  justify-content: center;
+
+  padding-top: 1rem;
+  padding-bottom: 1rem;
+}
+
+div.perfectTable>div {
+  display: flex;
+  flex-flow: row;
+}
+
+div.perfectTable>div>div.picked {
+  background: hsl(171, 100%, 41%);
+  color: #fff;
+}
+
+
+
+
+
+
+div.pickerContainer {
+  display: flex;
+  align-items: center;
+  flex-flow: row;
+  justify-content: center;
+}
+
+div.pickerContainer>div {
+  flex-grow: 1;
+  flex-shrink: 1;
+  flex-basis: 0;
+}
+
+div.pickerContainer>svg {
+  width: 100%;
+  height: 100%;
+}
+
+div.pickerContainer>svg>text {
+  dominant-baseline: middle;
+  text-anchor: middle;
+  user-select: none;
+  cursor: default;
+}
+
+div.pickerContainer>svg>circle[type=background] {
+  stroke-width: 0;
+  fill: #d0d0d0;
+}
+
+div.pickerContainer>svg>circle[type=symbol] {
+  stroke-width: 0;
+  fill: hsl(171, 100%, 41%);
+  /* $primary */
+}
+
+div.pickerContainer>svg>line {
+  stroke-width: 0.125em;
+  stroke: hsl(171, 100%, 41%);
+  /* $primary */
+}
+
+
+
+
+header.pickerHeader {
+  display: flex;
+  flex-flow: row;
+
+  flex-grow: 0;
+  flex-basis: 0;
+  flex-shrink: 0;
+
+  justify-content: space-between;
+}
+
+header.pickerHeader>div {
+  display: flex;
+  flex-flow: column;
+
+  flex-grow: 1;
+  flex-basis: 0;
+  flex-shrink: 0;
+}
+</style>

frontend/src/components/MessageBox.vue

@@ -0,0 +1,51 @@
+<script setup lang="ts">
+import { ref } from 'vue';
+
+const isVisible = ref(false);
+const title = ref<string>("");
+const content = ref<string>("");
+
+const emit = defineEmits<{
+  (e: 'closed', isOk: boolean): void
+}>()
+
+const show = (_content: string, _title?: string) => {
+  title.value = _title ?? "Notification";
+  content.value = _content;
+  isVisible.value = true;
+}
+
+const close = () => {
+  isVisible.value = false;
+  emit('closed', false);
+}
+
+const ok = () => {
+  isVisible.value = false;
+  emit('closed', true);
+}
+
+defineExpose({
+  show
+})
+</script>
+
+<template>
+  <div class="modal" :class="{ 'is-active': isVisible }" style="float: left; position: fixed; top: 0; bottom: 0; left: 0; right: 0;">
+    <div class="modal-background"></div>
+    <div class="modal-card">
+      <header class="modal-card-head">
+        <p class="modal-card-title">{{ title }}</p>
+        <button class="delete" aria-label="close" @click="close"></button>
+      </header>
+      <div class="modal-card-body">
+        <p>{{ content }}</p>
+      </div>
+      <footer class="modal-card-foot">
+        <button class="button is-success" @click="ok">OK</button>
+      </footer>
+    </div>
+  </div>
+</template>
+
+<style scoped></style>

frontend/src/components/calendar-event/EventLoopEditor.vue

@@ -0,0 +1,310 @@
+<script setup lang="ts">
+import { computed, ref, watch } from 'vue';
+import DateTimePicker, { TabType } from '@/components/DateTimePicker.vue';
+import { resolveLoopRules4UI, getDayInMonth } from '@/utils/datetime';
+import { WEEK_NAMES } from '@/utils/calendar-names';
+import { format } from '@/utils/utils';
+
+type LoopMethod = 'never' | 'day' | 'week' | 'month' | 'year';
+type StopMethod = 'forever' | 'datetime' | 'times';
+
+const props = defineProps<{
+  modelValue: string;
+  startDate: Date;
+}>();
+
+const emit = defineEmits<{
+  (e: 'update:modelValue', value: string): void
+}>();
+
+const stopPicker = ref<InstanceType<typeof DateTimePicker>>();
+
+const loopMethod = ref<LoopMethod>('never');
+const daySpan = ref<number>(1);
+const weekSpan = ref<number>(1);
+const monthSpan = ref<number>(1);
+const yearSpan = ref<number>(1);
+// default: today's weekday checked (Monday-first 0-6)
+const initialWeekday = (new Date().getDay() + 6) % 7;
+const weekChecks = ref<boolean[]>(Array.from({ length: 7 }, (_, i) => i === initialWeekday));
+const monthMode = ref<'A' | 'B' | 'C' | 'D'>('A');
+const isStrict = ref<boolean>(true);
+const stopMethod = ref<StopMethod>('forever');
+const stopTimes = ref<number>(1);
+const stopDateTime = ref<Date>(new Date());
+
+// region: Serialize / parse
+
+const buildString = (): string => {
+  let loopPart = '';
+  switch (loopMethod.value) {
+    case 'never':
+      return '';
+    case 'day':
+      loopPart = `D${daySpan.value}`;
+      break;
+    case 'week': {
+      const checks = weekChecks.value.map(b => b ? 'T' : 'F').join('');
+      loopPart = `W${checks}${weekSpan.value}`;
+      break;
+    }
+    case 'month':
+      loopPart = `M${isStrict.value ? 'S' : 'R'}${monthMode.value}${monthSpan.value}`;
+      break;
+    case 'year':
+      loopPart = `Y${isStrict.value ? 'S' : 'R'}${yearSpan.value}`;
+      break;
+  }
+  let stopPart = '';
+  switch (stopMethod.value) {
+    case 'forever':
+      stopPart = '-F';
+      break;
+    case 'datetime':
+      stopPart = `-D${Math.floor(stopDateTime.value.getTime() / 60000)}`;
+      break;
+    case 'times':
+      stopPart = `-T${stopTimes.value}`;
+      break;
+  }
+  return loopPart + stopPart;
+};
+
+const serialized = computed<string>(() => buildString());
+
+// Cast helpers: the parsed rule tuples are a union; index access is loose here.
+const parseFromModel = (val: string): void => {
+  if (val === serialized.value) return;
+  if (val === '') {
+    loopMethod.value = 'never';
+    return;
+  }
+  const parsed = resolveLoopRules4UI(val);
+  if (typeof parsed === 'undefined') {
+    loopMethod.value = 'never';
+    return;
+  }
+  const loopRule = parsed[0];
+  const stopRule = parsed[1];
+  switch (loopRule[0]) {
+    case 0:
+      loopMethod.value = 'year';
+      isStrict.value = loopRule[1];
+      yearSpan.value = loopRule[2];
+      break;
+    case 1:
+      loopMethod.value = 'month';
+      isStrict.value = loopRule[1];
+      monthMode.value = loopRule[2];
+      monthSpan.value = loopRule[3];
+      break;
+    case 2:
+      loopMethod.value = 'week';
+      weekChecks.value = [loopRule[1], loopRule[2], loopRule[3], loopRule[4], loopRule[5], loopRule[6], loopRule[7]];
+      weekSpan.value = loopRule[8];
+      break;
+    case 3:
+      loopMethod.value = 'day';
+      daySpan.value = loopRule[1];
+      break;
+  }
+  switch (stopRule[0]) {
+    case 0:
+      stopMethod.value = 'forever';
+      break;
+    case 1:
+      stopMethod.value = 'datetime';
+      // NOTE: treated as a plain UTC instant (day-precision stop), deviating
+      // from the legacy timezone-shifted display. See migration notes.
+      stopDateTime.value = new Date(stopRule[1] * 60000);
+      break;
+    case 2:
+      stopMethod.value = 'times';
+      stopTimes.value = stopRule[1];
+      break;
+  }
+};
+
+watch(() => props.modelValue, (val) => parseFromModel(val), { immediate: true });
+watch(serialized, (val) => {
+  if (val !== props.modelValue) emit('update:modelValue', val);
+});
+
+// endregion
+
+const showLoopStop = computed(() => loopMethod.value !== 'never');
+const showStrictMode = computed(() => loopMethod.value === 'month' || loopMethod.value === 'year');
+
+const monthOptionTexts = computed(() => {
+  const d = getDayInMonth(
+    props.startDate.getFullYear(),
+    props.startDate.getMonth() + 1,
+    props.startDate.getDate()
+  );
+  return {
+    A: format('Day {0} in month', d[0]),
+    B: format('Day {0} from the end of the month', d[1]),
+    C: format('Day {1} in week {0}', d[2], d[3] + 1),
+    D: format('Day {1} in week {0} from the end of the month', d[4], d[5] + 1),
+  };
+});
+
+const stopDateTimeText = computed(() => stopDateTime.value.toLocaleDateString());
+
+const openStopPicker = () => {
+  stopPicker.value?.modal(stopDateTime.value, TabType.Day);
+};
+
+const onStopPickerConfirm = (date: Date) => {
+  stopDateTime.value = date;
+};
+</script>
+
+<template>
+  <section class="section">
+    <h2 class="subtitle">Event Loop</h2>
+    <div class="button-list">
+      <label class="radio">
+        <input type="radio" value="never" v-model="loopMethod">
+        <span>Never</span>
+      </label>
+      <label class="radio">
+        <input type="radio" value="day" v-model="loopMethod">
+        <span>Day</span>
+      </label>
+      <label class="radio">
+        <input type="radio" value="week" v-model="loopMethod">
+        <span>Week</span>
+      </label>
+      <label class="radio">
+        <input type="radio" value="month" v-model="loopMethod">
+        <span>Month</span>
+      </label>
+      <label class="radio">
+        <input type="radio" value="year" v-model="loopMethod">
+        <span>Year</span>
+      </label>
+    </div>
+
+    <div v-if="loopMethod === 'day'">
+      <div class="field">
+        <label class="label">Day span</label>
+        <div class="control">
+          <input v-model.number="daySpan" class="input spanpicker" type="number" min="1" max="100" step="1">
+        </div>
+      </div>
+    </div>
+
+    <div v-if="loopMethod === 'week'">
+      <div class="field">
+        <label class="label">Week span</label>
+        <div class="control">
+          <input v-model.number="weekSpan" class="input spanpicker" type="number" min="1" max="100" step="1">
+        </div>
+      </div>
+      <div class="field">
+        <label class="label">Week options</label>
+        <div class="button-list">
+          <label v-for="(name, i) in WEEK_NAMES" :key="i" class="checkbox">
+            <input type="checkbox" v-model="weekChecks[i]">
+            <span>{{ name }}</span>
+          </label>
+        </div>
+      </div>
+    </div>
+
+    <div v-if="loopMethod === 'month'">
+      <div class="field">
+        <label class="label">Month span</label>
+        <div class="control">
+          <input v-model.number="monthSpan" class="input spanpicker" type="number" min="1" max="100" step="1">
+        </div>
+      </div>
+      <div class="field">
+        <label class="label">Month mode</label>
+        <div class="button-list">
+          <label class="radio">
+            <input type="radio" value="A" v-model="monthMode">
+            <span>{{ monthOptionTexts.A }}</span>
+          </label>
+          <label class="radio">
+            <input type="radio" value="B" v-model="monthMode">
+            <span>{{ monthOptionTexts.B }}</span>
+          </label>
+          <label class="radio">
+            <input type="radio" value="C" v-model="monthMode">
+            <span>{{ monthOptionTexts.C }}</span>
+          </label>
+          <label class="radio">
+            <input type="radio" value="D" v-model="monthMode">
+            <span>{{ monthOptionTexts.D }}</span>
+          </label>
+        </div>
+      </div>
+    </div>
+
+    <div v-if="loopMethod === 'year'">
+      <div class="field">
+        <label class="label">Year span</label>
+        <div class="control">
+          <input v-model.number="yearSpan" class="input spanpicker" type="number" min="1" max="100" step="1">
+        </div>
+      </div>
+    </div>
+  </section>
+
+  <section v-if="showStrictMode" class="section">
+    <h2 class="subtitle">Strict Mode in Event Loop</h2>
+    <p>You can choose strict mode or rough mode in following content. This is only effect on looped event.</p>
+    <div class="button-list">
+      <label class="radio">
+        <input type="radio" :value="true" v-model="isStrict">
+        <span>Strict Mode. If ordered day is not existing, skip it.</span>
+      </label>
+      <label class="radio">
+        <input type="radio" :value="false" v-model="isStrict">
+        <span>Rough mode. If ordered day is not existing, choose the day closing with original day to arrange event.</span>
+      </label>
+    </div>
+  </section>
+
+  <section v-if="showLoopStop" class="section">
+    <h2 class="subtitle">Event Loop Stop</h2>
+    <div class="button-list">
+      <label class="radio">
+        <input type="radio" value="forever" v-model="stopMethod">
+        <span>Forever</span>
+      </label>
+      <label class="radio">
+        <input type="radio" value="datetime" v-model="stopMethod">
+        <span>Date Time</span>
+      </label>
+      <label class="radio">
+        <input type="radio" value="times" v-model="stopMethod">
+        <span>Times</span>
+      </label>
+    </div>
+    <div v-if="stopMethod === 'datetime'">
+      <a class="button" @click="openStopPicker">
+        <span>{{ stopDateTimeText }}</span>
+      </a>
+    </div>
+    <div v-if="stopMethod === 'times'">
+      <div class="field">
+        <div class="control">
+          <input v-model.number="stopTimes" class="input spanpicker" type="number" min="1" max="100" step="1">
+        </div>
+      </div>
+    </div>
+  </section>
+
+  <DateTimePicker ref="stopPicker" @confirm="onStopPickerConfirm" />
+</template>
+
+<style scoped>
+.section {
+  border-top: 1px solid rgba(219, 219, 219, .5);
+  padding-top: 1.25rem;
+  margin-top: 1.25rem;
+}
+</style>

frontend/src/components/calendar/CalendarGrid.vue

@@ -0,0 +1,110 @@
+<script setup lang="ts">
+import { computed } from 'vue';
+import type { DisplayDay } from './types';
+import { format } from '@/utils/utils';
+
+const props = defineProps<{
+  cells: DisplayDay[];
+  weekNames: string[];
+}>();
+
+const emit = defineEmits<{
+  (e: 'event-click', uuid: string): void
+}>();
+
+const rows = computed<DisplayDay[][]>(() => {
+  const r: DisplayDay[][] = [];
+  for (let i = 0; i < 6; i++) r.push(props.cells.slice(i * 7, i * 7 + 7));
+  return r;
+});
+
+const overflowText = (count: number): string => {
+  return format('{0} items', count.toString());
+};
+</script>
+
+<template>
+  <div class="calendar-grid">
+    <div class="calendar-grid-header">
+      <div v-for="(name, i) in weekNames" :key="i" :class="{ weekend: i >= 5 }"><b>{{ name }}</b></div>
+    </div>
+    <div v-for="(row, ri) in rows" :key="ri" class="calendar-grid-row">
+      <div v-for="(cell, ci) in row" :key="ci" class="calendar-grid-cell"
+           :class="{ 'not-current-month': !cell.isCurrentMonth }">
+        <p class="cell-title">
+          <b>{{ cell.day }}</b>
+          <span>{{ cell.subcalendar }}</span>
+        </p>
+        <div v-for="(e, ei) in cell.events.slice(0, 4)" :key="ei" class="event-bar"
+             :style="{ background: e.color }" @click="emit('event-click', e.uuid)"></div>
+        <p v-if="cell.events.length > 4" class="cell-overflow">{{ overflowText(cell.events.length) }}</p>
+      </div>
+    </div>
+  </div>
+</template>
+
+<style scoped>
+.calendar-grid {
+  display: flex;
+  flex-flow: column;
+}
+
+.calendar-grid-header,
+.calendar-grid-row {
+  display: flex;
+  flex-flow: row;
+}
+
+.calendar-grid-cell {
+  flex-grow: 1;
+  flex-basis: 0;
+  flex-shrink: 0;
+
+  border-top: 1px solid black;
+  border-left: 1px solid black;
+  border-right: 1px solid black;
+  border-bottom: 1px solid black;
+
+  padding: 0.75em;
+
+  display: flex;
+  flex-flow: column;
+  align-items: flex-start;
+
+  overflow: hidden;
+}
+
+.calendar-grid-cell.not-current-month {
+  background: #d0d0d0;
+}
+
+/* remove the double border between adjacent cells */
+.calendar-grid-row .calendar-grid-cell:nth-child(n+2) {
+  border-left: 0;
+}
+
+.calendar-grid-row:nth-child(n+2) .calendar-grid-cell {
+  border-top: 0;
+}
+
+.cell-title {
+  margin-bottom: 0.25rem;
+}
+
+.cell-overflow {
+  margin-top: 0.2rem;
+}
+
+.event-bar {
+  border: 1px solid black;
+  border-radius: 2px;
+  margin-top: 0.2rem;
+  height: 0.75rem;
+  width: 100%;
+  cursor: pointer;
+}
+
+.weekend {
+  color: red;
+}
+</style>

frontend/src/components/calendar/CollectionToggleItem.vue

@@ -0,0 +1,36 @@
+<script setup lang="ts">
+defineProps<{
+  name: string;
+  subtitle?: string;
+  isShow: boolean;
+}>();
+
+const emit = defineEmits<{
+  (e: 'toggle'): void
+}>();
+</script>
+
+<template>
+  <div class="paperbox-item card">
+    <div class="paperbox-item-words">
+      <p v-if="subtitle === undefined"><b>{{ name }}</b></p>
+      <div v-else>
+        <b>{{ name }}</b>
+        <p>
+          <span>Shared by: </span>
+          <span>{{ subtitle }}</span>
+        </p>
+      </div>
+    </div>
+
+    <div class="paperbox-item-icon control" @click="emit('toggle')">
+      <a class="button">
+        <span class="icon is-small">
+          <font-awesome-icon :icon="isShow ? 'fas fa-eye' : 'fas fa-eye-slash'"></font-awesome-icon>
+        </span>
+      </a>
+    </div>
+  </div>
+</template>
+
+<style scoped></style>

frontend/src/components/calendar/ScheduleList.vue

@@ -0,0 +1,112 @@
+<script setup lang="ts">
+import type { DisplayDay } from './types';
+import { MONTH_NAMES, WEEK_NAMES } from '@/utils/calendar-names';
+
+defineProps<{
+  days: DisplayDay[];
+}>();
+
+const emit = defineEmits<{
+  (e: 'event-click', uuid: string): void
+}>();
+</script>
+
+<template>
+  <div class="schedule-list">
+    <div v-for="(day, di) in days" :key="di" class="schedule-day container">
+      <div class="schedule-day-words">
+        <b>{{ MONTH_NAMES[day.month - 1] }}</b>
+        <b>{{ day.day }}</b>
+        <b>{{ WEEK_NAMES[day.dayOfWeek - 1] }}</b>
+      </div>
+      <div class="schedule-event-list">
+        <template v-for="(ev, ei) in day.events" :key="ei">
+          <div v-if="ev.isVisible" class="schedule-event-outter card" @click="emit('event-click', ev.uuid)">
+            <div class="schedule-event-color" :style="{ background: ev.color }"></div>
+            <div class="schedule-event-inner">
+              <div class="schedule-event-words">
+                <p class="level-item"><b>{{ ev.title }}</b></p>
+                <p class="level-item">{{ ev.description }}</p>
+                <p class="level-item"><span>{{ ev.start }}</span>-<span>{{ ev.end }}</span></p>
+                <p v-if="ev.loopText !== ''">
+                  <span class="icon is-small"><font-awesome-icon icon="fas fa-retweet"></font-awesome-icon></span>
+                  <span>{{ ev.loopText }}</span>
+                </p>
+              </div>
+              <div class="schedule-event-icon">
+                <span v-if="ev.isLocked" class="icon is-small">
+                  <font-awesome-icon icon="fas fa-lock"></font-awesome-icon>
+                </span>
+                <span v-if="ev.timezoneWarning" class="icon is-small">
+                  <font-awesome-icon icon="fas fa-globe"></font-awesome-icon>
+                </span>
+              </div>
+            </div>
+          </div>
+        </template>
+      </div>
+    </div>
+  </div>
+</template>
+
+<style scoped>
+.schedule-day {
+  display: flex;
+  flex-flow: column;
+}
+
+.schedule-day-words {
+  margin-top: 0.75rem;
+  margin-bottom: 0.75rem;
+}
+
+.schedule-day-words b {
+  margin-right: 0.5rem;
+}
+
+.schedule-event-list {
+  display: flex;
+  flex-flow: column;
+}
+
+.schedule-event-outter {
+  display: flex;
+  flex-flow: row;
+  align-items: flex-start;
+
+  margin-bottom: 1.25rem;
+  cursor: pointer;
+}
+
+.schedule-event-inner {
+  display: flex;
+  flex-flow: row;
+  align-items: flex-start;
+
+  padding: 1.25rem;
+}
+
+.schedule-event-words {
+  display: flex;
+  flex-flow: column;
+  align-items: flex-start;
+  flex-grow: 1;
+  flex-basis: 0;
+
+  word-break: break-all;
+}
+
+.schedule-event-icon {
+  margin-left: 0.75rem;
+}
+
+.schedule-event-color {
+  width: 0.75rem;
+  height: 100%;
+  min-height: 2rem;
+}
+
+.schedule-list .schedule-day:nth-child(n+2) {
+  border-top: 1px solid rgba(219, 219, 219, .5);
+}
+</style>

frontend/src/components/calendar/types.ts

@@ -0,0 +1,26 @@
+/** A single analyzed event occurrence placed into a calendar day cell. */
+export interface DisplayEvent {
+  uuid: string;
+  belongTo: string;
+  title: string;
+  description: string;
+  color: string;
+  isVisible: boolean;
+  isLocked: boolean;
+  loopText: string;
+  timezoneWarning: boolean;
+  start: string;
+  end: string;
+}
+
+/** A single day cell in the 6x7 calendar grid, carrying its events. */
+export interface DisplayDay {
+  /** 1-12 */
+  month: number;
+  day: number;
+  /** 1-7, Monday = 1 */
+  dayOfWeek: number;
+  isCurrentMonth: boolean;
+  subcalendar: string;
+  events: DisplayEvent[];
+}

frontend/src/components/collection/OwnedItem.vue

@@ -0,0 +1,83 @@
+<script setup lang="ts">
+import { ref } from 'vue';
+
+const props = defineProps({
+  uuid: {
+    type: String,
+    required: true
+  },
+  name: {
+    type: String,
+    required: true
+  }
+})
+
+const emit = defineEmits<{
+  (e: 'delete', uuid: string): void
+  (e: 'share', uuid: string): void
+  (e: 'update', uuid: string, name: string): void
+}>()
+
+const isEditing = ref<boolean>(false);
+const editingName = ref<string>("");
+
+const editItem = () => {
+  isEditing.value = true;
+  editingName.value = props.name;
+}
+
+const shareItem = () => {
+  emit('share', props.uuid);
+}
+
+const deleteItem = () => {
+  emit('delete', props.uuid);
+}
+
+const updateItem = () => {
+  const new_name = editingName.value;
+  editingName.value = "";
+  isEditing.value = false;
+  emit('update', props.uuid, new_name);
+}
+
+const cancelUpdateItem = () => {
+  editingName.value = "";
+  isEditing.value = false;
+}
+
+</script>
+
+<template>
+  <div class="paperbox-item card">
+    <div class="paperbox-item-words">
+      <p v-show="!isEditing">{{ name }}</p>
+      <div v-show="isEditing" class="control">
+        <input v-model="editingName" class="input" type="text"></input>
+      </div>
+    </div>
+
+    <div class="paperbox-item-icon control" v-show="!isEditing" @click="editItem">
+      <a class="button"><span class="icon is-small"><font-awesome-icon icon="fas fa-pen"></font-awesome-icon></span></a>
+    </div>
+    <div class="paperbox-item-icon control" v-show="!isEditing" @click="shareItem">
+      <a class="button"><span class="icon is-small"><font-awesome-icon
+            icon="fas fa-share"></font-awesome-icon></span></a>
+    </div>
+    <div class="paperbox-item-icon control" v-show="!isEditing" @click="deleteItem">
+      <a class="button"><span class="icon is-small"><font-awesome-icon
+            icon="fas fa-trash"></font-awesome-icon></span></a>
+    </div>
+
+    <div class="paperbox-item-icon control" v-show="isEditing" @click="updateItem">
+      <button class="button"><span class="icon is-small"><font-awesome-icon
+            icon="fas fa-check"></font-awesome-icon></span></button>
+    </div>
+    <div class="paperbox-item-icon control" v-show="isEditing" @click="cancelUpdateItem">
+      <button class="button"><span class="icon is-small"><font-awesome-icon
+            icon="fas fa-times"></font-awesome-icon></span></button>
+    </div>
+  </div>
+</template>
+
+<style scoped></style>

frontend/src/components/collection/SharingItem.vue

@@ -0,0 +1,32 @@
+<script setup lang="ts">
+
+const props = defineProps({
+  username: {
+    type: String,
+    required: true
+  }
+})
+
+const emit = defineEmits<{
+  (e: 'delete', username: string): void
+}>()
+
+const deleteItem = () => {
+  emit('delete', props.username);
+};
+
+</script>
+
+<template>
+  <div class="paperbox-item card">
+    <div class="paperbox-item-words">
+      <p>{{ username }}</p>
+    </div>
+
+    <div class="paperbox-item-icon control" @click="deleteItem">
+      <a class="button"><span class="icon is-small"><font-awesome-icon icon="fas fa-trash"></font-awesome-icon></span></a>
+    </div>
+  </div>
+</template>
+
+<style scoped></style>

frontend/src/main.ts

@@ -0,0 +1,25 @@
+import { createApp } from 'vue'
+import { createPinia } from 'pinia'
+
+import { library } from '@fortawesome/fontawesome-svg-core'
+import { FontAwesomeIcon } from '@fortawesome/vue-fontawesome'
+import { faUser, faLock, faPen, faShare, faTrash, faCheck, faTimes, faPlus, faSync, faChevronCircleLeft, faChevronCircleRight, faEye, faEyeSlash, faRetweet, faGlobe } from '@fortawesome/free-solid-svg-icons'
+
+import piniaPluginPersistedstate from 'pinia-plugin-persistedstate'
+
+import App from './App.vue'
+import router from './router'
+
+import '../public/index.scss'
+
+const pinia = createPinia();
+pinia.use(piniaPluginPersistedstate);
+
+const app = createApp(App);
+app.use(pinia);
+app.use(router);
+
+library.add(faUser, faLock, faPen, faShare, faTrash, faCheck, faTimes, faPlus, faSync, faChevronCircleLeft, faChevronCircleRight, faEye, faEyeSlash, faRetweet, faGlobe);
+app.component('font-awesome-icon', FontAwesomeIcon);
+
+app.mount('#app');

frontend/src/router/index.ts

@@ -0,0 +1,60 @@
+import { createRouter, createWebHistory } from 'vue-router'
+import { useTokenStore } from '@/stores/token'
+
+import Home from '@/views/Home.vue'
+import Collection from '@/views/Collection.vue'
+import Calendar from '@/views/Calendar.vue'
+import CalendarEvent from '@/views/CalendarEvent.vue'
+import Todo from '@/views/Todo.vue'
+import Admin from '@/views/Admin.vue'
+import Login from '@/views/Login.vue'
+
+import NotFound from '@/views/NotFound.vue'
+
+const routes = [
+  { path: '/home', name: "Home", component: Home },
+  { path: '/collection', name: "Collection", meta: { requireLoggedInCheck: true }, component: Collection },
+  { path: '/calendar', name: "Calendar", meta: { requireLoggedInCheck: true }, component: Calendar },
+  { path: '/todo', name: "Todo", meta: { requireLoggedInCheck: true }, component: Todo },
+  { path: '/admin', name: "Admin", meta: { requireLoggedInCheck: true }, component: Admin },
+
+  { path: '/calendar/event', name: "CalendarEventAdd", meta: { requireLoggedInCheck: true }, component: CalendarEvent },
+  { path: '/calendar/event/:uuid', name: "CalendarEventUpdate", meta: { requireLoggedInCheck: true }, component: CalendarEvent },
+  { path: '/login', name: "Login", meta: { requireLoggedOutCheck: true }, component: Login },
+
+  { path: '/404', name: "NotFound", component: NotFound },
+
+  { path: '/', name: "Default", redirect: '/home' },
+  { path: '/:pathMatch(.*)*', redirect: '/404' },
+];
+
+const router = createRouter({
+  history: createWebHistory(import.meta.env.BASE_URL),
+  routes: routes,
+});
+
+router.beforeEach((to, from) => {
+  // Only check for those flagged.
+  const token = useTokenStore();
+  if (to.meta.requireLoggedInCheck) {
+    if (!token.isLoggedIn) {
+      return { name: 'Default', replace: true };
+    }
+  } else if (to.meta.requireLoggedOutCheck) {
+    if (token.isLoggedIn) {
+      return { name: 'Default', replace: true };
+    }
+  } else {
+    return true;
+  }
+})
+
+export const goToHome = () => {
+  router.push({ name: 'Home' })
+}
+
+export const goToCalendar = () => {
+  router.push({ name: 'Calendar' })
+}
+
+export default router

frontend/src/stores/language.ts

@@ -0,0 +1,35 @@
+import { defineStore } from 'pinia'
+import { Language } from '@/utils/i18n'
+
+interface LanguageState {
+  language: Language
+}
+
+export const useLanguageStore = defineStore('language', {
+  state: (): LanguageState => ({
+    language: Language.English
+  }),
+
+  getters: {
+    isEnglish: (state) => state.language === Language.English,
+    isSimplifiedChinese: (state) => state.language === Language.SimplifiedChinese,
+  },
+
+  actions: {
+    changeLanguage(lang: Language) {
+      this.language = lang;
+    },
+    changeToEnglish() {
+      this.changeLanguage(Language.English);
+    },
+    changeToSimplifiedChinese() {
+      this.changeLanguage(Language.SimplifiedChinese);
+    },
+  },
+
+  persist: {
+    key: 'ccn-i18n',
+    storage: localStorage,
+    pick: ['language'],
+  },
+})

frontend/src/stores/token.ts

@@ -0,0 +1,31 @@
+import { defineStore } from 'pinia'
+
+interface TokenState {
+    token: string | null
+}
+
+export const useTokenStore = defineStore('token', {
+  state: (): TokenState => ({
+    token: null,
+  }),
+
+  getters: {
+    isLoggedIn: (state) => typeof state.token === 'string',
+    currentToken: (state) => state.token as string,
+  },
+
+  actions: {
+    login(token: string) {
+        this.token = token;
+    },
+    logout() {
+        this.token = null;
+    },
+  },
+
+  persist: {
+    key: 'ccn-token',
+    storage: localStorage,
+    pick: ['token'],
+  },
+})

frontend/src/utils/calendar-names.ts

@@ -0,0 +1,8 @@
+export const MONTH_NAMES: string[] = [
+  'January', 'February', 'March', 'April', 'May', 'June',
+  'July', 'August', 'September', 'October', 'November', 'December'
+];
+
+export const WEEK_NAMES: string[] = [
+  'Monday', 'Tuesday', 'Wednesday', 'Thursday', 'Friday', 'Saturday', 'Sunday'
+];

frontend/src/utils/datetime.ts

@@ -0,0 +1,570 @@
+import { lcm, format } from "./utils";
+import { universalGetDayOfWeek } from "./i18n";
+
+// YYC MARK:
+// This file is synchronized with "dt.py".
+// If this file or dt.py have bugs, all code should be changed together.
+
+export const MONTH_DAY_COUNT: number[] = [31, 28, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31];
+
+export const MIN_YEAR: number = 1950;
+export const MAX_YEAR: number = 2200;
+export const MIN_DATETIME = new Date(Date.UTC(MIN_YEAR, 0, 1, 0, 0, 0, 0));
+export const MAX_DATETIME = new Date(Date.UTC(MAX_YEAR, 0, 1, 0, 0, 0, 0));
+export const MIN_TIMESTAMP = Math.floor(MIN_DATETIME.getTime() / 60000);
+export const MAX_TIMESTAMP = Math.floor(MAX_DATETIME.getTime() / 60000);
+
+export const DAY1_SPAN: number = 60 * 24;
+export const DAY7_SPAN: number = 7 * DAY1_SPAN;
+
+const PRECOMPILED_LOOP_RULES = {
+  year: new RegExp(/^Y([SR]{1})([1-9]\d*)$/),
+  month: new RegExp(/^M([SR]{1})([ABCD]{1})([1-9]\d*)$/),
+  week: new RegExp(/^W([TF]{7})([1-9]\d*)$/),
+  day: new RegExp(/^D([1-9]\d*)$/)
+};
+
+const PRECOMPILED_LOOP_STOP_RULES = {
+  infinity: new RegExp(/^F$/),
+  datetime: new RegExp(/^D([1-9]\d*|0)$/),
+  times: new RegExp(/^T([1-9]\d*)$/)
+};
+
+// region: Core Functions
+
+/** Year loop: [type=0, isStrict, yearSpan] */
+type YearLoopRule = [0, boolean, number];
+/** Month loop: [type=1, isStrict, mode, monthSpan] */
+type MonthLoopRule = [1, boolean, 'A' | 'B' | 'C' | 'D', number];
+/** Week loop: [type=2, 7 weekday booleans, weekSpan] */
+type WeekLoopRule = [2, boolean, boolean, boolean, boolean, boolean, boolean, boolean, number];
+/** Day loop: [type=3, daySpan] */
+type DayLoopRule = [3, number];
+
+type LoopRule = YearLoopRule | MonthLoopRule | WeekLoopRule | DayLoopRule;
+
+/** Infinity stop: [type=0] */
+type InfinityStopRule = [0];
+/** Datetime stop: [type=1, timestamp] */
+type DatetimeStopRule = [1, number];
+/** Times stop: [type=2, times] */
+type TimesStopRule = [2, number];
+
+type LoopStopRule = InfinityStopRule | DatetimeStopRule | TimesStopRule;
+
+/**
+ * Parses a raw loop rule string (e.g. "YS2-F") into structured rule arrays
+ * for UI display purposes.
+ * @param strl - The loop rule string in format "loopRule-stopRule".
+ * @returns A tuple of [LoopRule, LoopStopRule] on success, or undefined
+ *          when the string is empty, malformed, or contains no valid rule.
+ */
+export function resolveLoopRules4UI(strl: string): [LoopRule, LoopStopRule] | undefined {
+  if (strl == '') return undefined;
+
+  const sp = strl.split('-');
+  if (sp.length != 2) return undefined;
+  let loopRules: LoopRule | undefined = undefined;
+  let loopStopRules: LoopStopRule | undefined = undefined;
+
+  let match: RegExpExecArray | null;
+  if ((match = PRECOMPILED_LOOP_RULES.year.exec(sp[0]!)) !== null) {
+    loopRules = [0, match[1]! == 'S', parseInt(match[2]!)];
+  } else if ((match = PRECOMPILED_LOOP_RULES.month.exec(sp[0]!)) !== null) {
+    loopRules = [1, match[1]! == 'S', match[2]! as 'A' | 'B' | 'C' | 'D', parseInt(match[3]!)];
+  } else if ((match = PRECOMPILED_LOOP_RULES.week.exec(sp[0]!)) !== null) {
+    const w = match[1]!;
+    loopRules = [2, w[0] == 'T', w[1] == 'T', w[2] == 'T', w[3] == 'T', w[4] == 'T', w[5] == 'T', w[6] == 'T', parseInt(match[2]!)] as WeekLoopRule;
+  } else if ((match = PRECOMPILED_LOOP_RULES.day.exec(sp[0]!)) !== null) {
+    loopRules = [3, parseInt(match[1]!)];
+  } else return undefined;
+
+  if ((match = PRECOMPILED_LOOP_STOP_RULES.infinity.exec(sp[1]!)) !== null) {
+    loopStopRules = [0];
+  } else if ((match = PRECOMPILED_LOOP_STOP_RULES.datetime.exec(sp[1]!)) !== null) {
+    loopStopRules = [1, parseInt(match[1]!)];
+  } else if ((match = PRECOMPILED_LOOP_STOP_RULES.times.exec(sp[1]!)) !== null) {
+    loopStopRules = [2, parseInt(match[1]!)];
+  } else return undefined;
+
+  return [loopRules, loopStopRules];
+}
+
+/** A pair of [start, end] timestamps (in minutes) representing a single event occurrence. */
+type TimeRange = [number, number];
+
+/**
+ * Resolves a loop rule string into concrete event date ranges by expanding
+ * the loop pattern across the detection window.
+ * @remark loopDateTimeStart's value does not correspond with the database;
+ *         it is calculated by the program and should point to the closet
+ *         potential event start datetime.
+ * @remark loopDateTimeEnd is performed like loopDateTimeStart and
+ *         it indicates the possible time point of the tail of legal event.
+ * @remark clampStartDateTime is the real clamp datetime of event start
+ *         datetime.
+ * @remark loopDateTimeStart is the start datetime for detection.
+ * @remark In this section, all times should be analysed with
+ *         `Date((time + timezoneOffset) * 60000)` and use `.getUTC...()`
+ *         functions.
+ * @param loopRules - The loop rule string (e.g. "YS2-F").
+ * @param loopDateTimeStart - Start of the detection window (minutes).
+ * @param loopDateTimeEnd - End of the detection window (minutes).
+ * @param eventDateTimeStart - Original event start datetime (minutes).
+ * @param eventDateTimeEnd - Original event end datetime (minutes).
+ * @param timezoneOffset - Timezone offset in minutes.
+ * @param clampStartDateTime - Earliest allowed start datetime (minutes).
+ * @returns An array of [start, end] timestamp pairs representing every
+ *          occurrence within the window, or undefined if the rule is invalid.
+ */
+export function resolveLoopRules2Event(
+  fullLoopRules: string,
+  loopDateTimeStart: number,
+  loopDateTimeEnd: number,
+  eventDateTimeStart: number,
+  eventDateTimeEnd: number,
+  timezoneOffset: number,
+  clampStartDateTime: number): TimeRange[] | undefined {
+  if (fullLoopRules == '') return [
+    [Math.max(eventDateTimeStart, clampStartDateTime),
+    Math.max(loopDateTimeEnd, eventDateTimeEnd)]
+  ];
+
+  const sp = fullLoopRules.split('-');
+  if (sp.length != 2) return undefined;
+  const loopRules = sp[0]!;  // we don't need consider stop flag
+  const result: TimeRange[] = [];
+
+  // compute offset and duration
+  const eventDateTime = new Date((eventDateTimeStart + timezoneOffset) * 60000);
+  eventDateTime.setUTCHours(0, 0, 0, 0);
+  const eventOffset = eventDateTimeStart - (Math.floor(eventDateTime.getTime() / 60000) - timezoneOffset);
+  const eventDuration = eventDateTimeEnd - eventDateTimeStart;
+
+  const detectDateTime = new Date(loopDateTimeStart * 60000);
+  detectDateTime.setUTCHours(0, 0, 0, 0);
+  const originalYear = eventDateTime.getUTCFullYear();
+  const originalMonth = eventDateTime.getUTCMonth() + 1;
+  const originalDay = eventDateTime.getUTCDate();
+
+  // compute event
+  let match: RegExpExecArray | null;
+  if ((match = PRECOMPILED_LOOP_RULES.year.exec(loopRules)) !== null) {
+    const isStrict = match[1]! == 'S';
+    const loopSpan = parseInt(match[2]!);
+
+    const yearCount = detectDateTime.getFullYear() - originalYear;
+    const isSpecial = (originalMonth == 2 && originalDay == 29);
+    const realLoopSpan = (isSpecial && isStrict) ? lcm(4, loopSpan) : loopSpan;
+
+    //let fullSpanCount = Math.floor(yearCount / realLoopSpan);
+    const remainYear = yearCount % realLoopSpan;
+    //detectDateTime.setUTCFullYear(fullSpanCount + detectDateTime.getUTCFullYear(), 1, 1);
+    if (remainYear != 0)
+      detectDateTime.setUTCFullYear(realLoopSpan - remainYear + detectDateTime.getUTCFullYear(), 1 - 1, 1);
+
+    let skipFlag = false;
+    while (Math.floor(detectDateTime.getTime() / 60000) + eventOffset - timezoneOffset <= loopDateTimeEnd) {
+      skipFlag = false;
+      if (isSpecial) {
+        // is special day, 29 Feb
+        // try set it in 29 Feb
+        if (isStrict) {
+          if (isLeapYear(detectDateTime.getUTCFullYear())) detectDateTime.setUTCMonth(2 - 1, 29);
+          else skipFlag = true;  // order skip
+        } else {
+          if (isLeapYear(detectDateTime.getUTCFullYear())) detectDateTime.setUTCMonth(2 - 1, 29);
+          else detectDateTime.setUTCMonth(2 - 1, 28);
+        }
+      } else detectDateTime.setUTCMonth(originalMonth - 1, originalDay);
+
+      if (!skipFlag) {
+        result.push(
+          [Math.floor(detectDateTime.getTime() / 60000) + eventOffset - timezoneOffset,
+          Math.floor(detectDateTime.getTime() / 60000) + eventOffset + eventDuration - timezoneOffset]
+        );
+      }
+
+      detectDateTime.setUTCFullYear(realLoopSpan + detectDateTime.getUTCFullYear());
+    }
+
+  } else if ((match = PRECOMPILED_LOOP_RULES.month.exec(loopRules)) !== null) {
+    const isStrict = match[1]! == 'S';
+    const loopMethod = match[2]!;
+    const loopSpan = parseInt(match[3]!);
+
+    const monthsCountValue = monthsCount(detectDateTime.getUTCFullYear(), detectDateTime.getUTCMonth() + 1) -
+      monthsCount(originalYear, originalMonth);
+
+    //let fullSpanCount = Math.floor(monthsCountValue / loopSpan);
+    const remainMonth = monthsCountValue % loopSpan;
+    //detectDateTime.setUTCMonth(fullSpanCount * loopSpan + detectDateTime.getUTCMonth(), 1);
+    detectDateTime.setUTCDate(1);
+    if (remainMonth != 0)
+      detectDateTime.setUTCMonth(loopSpan - remainMonth + detectDateTime.getUTCMonth(), 1);
+
+    while (Math.floor(detectDateTime.getTime() / 60000) + eventOffset - timezoneOffset <= loopDateTimeEnd) {
+      const data = getRemanagedDayInMonth(originalYear, originalMonth, originalDay, detectDateTime.getUTCFullYear(), detectDateTime.getUTCMonth() + 1, isStrict);
+      let predictedDay: number | undefined = undefined;
+      switch (loopMethod) {
+        case 'A':
+          if (typeof (data[0]) !== 'undefined') predictedDay = data[0];
+          break;
+        case 'B':
+          if (typeof (data[1]) !== 'undefined') predictedDay = data[1];
+          break;
+        case 'C':
+          if (typeof (data[2]) !== 'undefined') predictedDay = data[2];
+          break;
+        case 'D':
+          if (typeof (data[3]) !== 'undefined') predictedDay = data[3];
+          break;
+      }
+      if (typeof (predictedDay) !== 'undefined') {
+        detectDateTime.setUTCDate(predictedDay);
+        result.push(
+          [Math.floor(detectDateTime.getTime() / 60000) + eventOffset - timezoneOffset,
+          Math.floor(detectDateTime.getTime() / 60000) + eventOffset + eventDuration - timezoneOffset]
+        );
+      }
+
+      detectDateTime.setUTCMonth(loopSpan + detectDateTime.getUTCMonth(), 1);
+    }
+
+
+  } else if ((match = PRECOMPILED_LOOP_RULES.week.exec(loopRules)) !== null) {
+    const loopSpan = parseInt(match[2]!);
+    const weekOption: boolean[] = [];
+    let weekEventCount = 0
+    for (let i = 0; i < 7; i++) {
+      weekOption.push(match[1]![i] == 'T');
+      if (match[1]![i] == 'T') weekEventCount++;
+    }
+
+    const originalWeek = dayOfWeek(originalYear, originalMonth, originalDay);
+
+    // try insert original event
+    if (!weekOption[originalWeek]) {
+      result.push(
+        [eventDateTimeStart, eventDateTimeEnd]
+      );
+    }
+
+    const daysCountValue = daysCount(detectDateTime.getUTCFullYear(), detectDateTime.getUTCMonth() + 1, detectDateTime.getDate()) -
+      daysCount(originalYear, originalMonth, originalDay);
+    //let fullSpanCount = Math.floor(daysCountValue / (7 * loopSpan));
+    const remainFullSpanCount = Math.floor((daysCountValue % (7 * loopSpan)) / 7);
+    const remainDays = (daysCountValue % (7 * loopSpan)) % 7;
+
+    //detectDateTime.setUTCDate((7 * loopSpan * fullSpanCount) + detectDateTime.getUTCDate());
+    if (remainFullSpanCount != 0) {
+      detectDateTime.setUTCDate((loopSpan - remainFullSpanCount) * 7 + detectDateTime.getUTCDate());
+    }
+    let weekCounter = remainDays;
+
+    while (Math.floor(detectDateTime.getTime() / 60000) + eventOffset - timezoneOffset <= loopDateTimeEnd) {
+      if (weekOption[(weekCounter + originalWeek) % 7])
+        result.push(
+          [Math.floor(detectDateTime.getTime() / 60000) + eventOffset - timezoneOffset,
+          Math.floor(detectDateTime.getTime() / 60000) + eventOffset + eventDuration - timezoneOffset]
+        );
+
+      weekCounter = (weekCounter + 1) % 7;
+      detectDateTime.setUTCDate(detectDateTime.getUTCDate() + 1);
+      if (weekCounter == 0)
+        detectDateTime.setUTCDate(detectDateTime.getUTCDate() + (loopSpan - 1) * 7);
+    }
+
+  } else if ((match = PRECOMPILED_LOOP_RULES.day.exec(loopRules)) !== null) {
+    const loopSpan = parseInt(match[1]!);
+
+    const daysCountValue = daysCount(detectDateTime.getUTCFullYear(), detectDateTime.getUTCMonth() + 1, detectDateTime.getUTCDate()) -
+      daysCount(originalYear, originalMonth, originalDay);
+    //let fullSpanCount = Math.floor(daysCountValue / loopSpan);
+    const remainDays = daysCountValue % loopSpan;
+    //detectDateTime.setUTCDate(fullSpanCount * loopSpan + detectDateTime.getUTCDate());
+    if (remainDays != 0)
+      detectDateTime.setUTCDate(loopSpan - remainDays + detectDateTime.getUTCDate());
+
+    while (Math.floor(detectDateTime.getTime() / 60000) + eventOffset - timezoneOffset <= loopDateTimeEnd) {
+      result.push(
+        [Math.floor(detectDateTime.getTime() / 60000) + eventOffset - timezoneOffset,
+        Math.floor(detectDateTime.getTime() / 60000) + eventOffset + eventDuration - timezoneOffset]
+      );
+      detectDateTime.setUTCDate(detectDateTime.getUTCDate() + loopSpan);
+    }
+  } else return undefined;
+
+  // clamp item
+  const realResult: TimeRange[] = [];
+  for (const i of result) {
+    const start = i[0];
+    const end = i[1];
+    if (end > clampStartDateTime && start <= loopDateTimeEnd)
+      realResult.push([Math.max(start, clampStartDateTime), Math.min(end, loopDateTimeEnd)]);
+  }
+  return realResult;
+}
+
+/**
+ * Resolves a loop rule string into a human-readable i18n-localised text
+ * description suitable for display in the UI.
+ * @param strl - The loop rule string in format "loopRule-stopRule".
+ * @param startDateTime - Reference start datetime (minutes) for computing
+ *                        contextual fields (e.g. day-in-month info).
+ * @param timezoneOffset - Timezone offset in minutes.
+ * @returns A concatenated human-readable string, or an empty string when
+ *          the input is empty or cannot be parsed.
+ */
+export function resolveLoopRules4Text(strl: string, startDateTime: number, timezoneOffset: number): string {
+  if (strl == '') return "";
+
+  const sp = strl.split('-');
+  if (sp.length != 2) return "";
+  let loopRules: string;
+  let loopStopRules: string;
+  const datetimeInstance = new Date((startDateTime + timezoneOffset) * 60000)
+
+  let match: RegExpExecArray | null;
+  if ((match = PRECOMPILED_LOOP_RULES.year.exec(sp[0]!)) !== null) {
+    if (match[1]! == 'S')
+      loopRules = "严格模式。";
+    else
+      loopRules = "宽松模式。";
+    loopRules += format("每{0}年于{1}循环一次。",
+      parseInt(match[2]!), datetimeInstance.toLocaleDateString(undefined, { timeZone: "UTC" })
+    );
+  } else if ((match = PRECOMPILED_LOOP_RULES.month.exec(sp[0]!)) !== null) {
+    if (match[1]! == 'S')
+      loopRules = "严格模式。";
+    else
+      loopRules = "宽松模式。";
+
+    const dayInMonth = getDayInMonth(
+      datetimeInstance.getUTCFullYear(),
+      datetimeInstance.getUTCMonth() + 1,
+      datetimeInstance.getUTCDate());
+    switch (match[2]!) {
+      case 'A':
+        loopRules = format("每{0}月的第{1}日循环一次。",
+          parseInt(match[3]!), dayInMonth[0]
+        );
+        break;
+      case 'B':
+        loopRules = format("每{0}月的倒数第{1}日循环一次。",
+          parseInt(match[3]!), dayInMonth[1]
+        );
+        break;
+      case 'C':
+        loopRules = format("每{0}月的第{1}个星期{2}循环一次。",
+          parseInt(match[3]!), dayInMonth[2], dayInMonth[3]
+        );
+        break;
+      case 'D':
+        loopRules = format("每{0}月的倒数第{1}个星期{2}循环一次。",
+          parseInt(match[3]!), dayInMonth[4], dayInMonth[5]
+        );
+        break;
+    }
+  } else if ((match = PRECOMPILED_LOOP_RULES.week.exec(sp[0]!)) !== null) {
+    const weekOfDayCache = [];
+    for (let i = 0; i < 7; i++) {
+      if (match[1]![i] == 'T')
+        weekOfDayCache.push(universalGetDayOfWeek(i));
+    }
+
+    loopRules = format("每{0}周的{1}循环一次。",
+      parseInt(match[2]!), weekOfDayCache.join(', ')
+    );
+  } else if ((match = PRECOMPILED_LOOP_RULES.day.exec(sp[0]!)) !== null) {
+    loopRules = format("每{0}天循环一次。", parseInt(match[1]!));
+  } else return "";
+
+
+  if ((match = PRECOMPILED_LOOP_STOP_RULES.infinity.exec(sp[1]!)) !== null) {
+    loopStopRules = "永远循环。";
+  } else if ((match = PRECOMPILED_LOOP_STOP_RULES.datetime.exec(sp[1]!)) !== null) {
+    loopStopRules = format("到{0}停止循环。",
+      new Date(parseInt(match[1]!)).toLocaleDateString()
+    );
+  } else if ((match = PRECOMPILED_LOOP_STOP_RULES.times.exec(sp[1]!)) !== null) {
+    loopStopRules = format("循环{0}次。", parseInt(match[1]!));
+  } else return "";
+
+  return (loopRules + loopStopRules);
+}
+
+// endregion
+
+// region: Utility Functions
+
+function leapYearCountEx(endYear: number, includeThis: boolean, baseYear: number, includeBase: boolean): number {
+  if (!includeThis) endYear--;
+  if (includeBase) baseYear--;
+
+  let endly = Math.floor(endYear / 4);
+  endly -= Math.floor(endYear / 100);
+  endly += Math.floor(endYear / 400);
+
+  let basely = Math.floor(baseYear / 4);
+  basely -= Math.floor(baseYear / 100);
+  basely += Math.floor(baseYear / 400);
+
+  return (endly - basely);
+}
+
+function daysCount(year: number, month: number, day: number): number {
+  const ly = leapYearCountEx(year, false, 1, true);
+  let days = 365 * (year - 1);
+  days += ly;
+
+  for (let index = 1; index < month; index++)
+    days += MONTH_DAY_COUNT[index - 1]!;
+
+  if (month > 2 && isLeapYear(year))
+    days += 1;
+
+  days += day - 1;
+  return days;
+}
+
+function monthsCount(year: number, month: number): number {
+  return (year - 1) * 12 + (month - 1);
+}
+
+export function dayOfWeek(year: number, month: number, day: number): number {
+  return daysCount(year, month, day) % 7;
+}
+
+type DayInMonthInfo = [
+  /** The day count to this day, counting from month head to tail. */
+  daysForward: number,
+  /** The day count to this day, counting from month tail to head. */
+  daysBackward: number,
+  /** The count of the week this day located, counting from month head to tail. */
+  weeksForward: number,
+  /** The day count in this week. (for `weeksForward` using) */
+  weeksForwardDayOfWeek: number,
+  /** The count of the week this day located, counting from month tail to head. */
+  weeksBackward: number,
+  /** The day count in this week. (for `weeksBackward` using) */
+  weeksBackwardDayOfWeek: number,
+];
+
+export function getDayInMonth(year: number, month: number, day: number): DayInMonthInfo {
+  const days = MONTH_DAY_COUNT[month - 1]! + ((month == 2 && isLeapYear(year)) ? 1 : 0);
+  const firstDayOfWeek = dayOfWeek(year, month, 1);
+  const bilateralDayOfWeek = (firstDayOfWeek + day - 1) % 7;
+
+  const dayForwards = day;
+  const dayBackwards = days - day + 1;
+
+  const weeksForward = Math.floor((dayForwards - 1) / 7) + 1;
+  const weeksBackwards = Math.floor((dayBackwards - 1) / 7) + 1;
+
+  return [dayForwards, dayBackwards, weeksForward, bilateralDayOfWeek, weeksBackwards, bilateralDayOfWeek];
+}
+
+// YYC MARK:
+// I use Japanese word youbi (ようび) to present
+// the concept of "the day of week" exactly.
+
+type RemanagedDayInMonth = [
+  /** Count forward by days (Day N)  */
+  forwardByDayCount: number | undefined,
+  /** Count backward by days (Nth day from the end) */
+  backwardByDayCount: number | undefined,
+  /** Count forward by weeks (Week N, Youbi X) */
+  forwardByWeekCount: number | undefined,
+  /** Count backward by weeks (Nth week from the end, Youbi X) */
+  backwardByWeekCount: number | undefined,
+];
+
+/**
+ * Pass in an old date and a new month, and it will calculate 
+ * the new date corresponding to that old date in the new month 
+ * using four different calendar rules:
+ * @param oldYear 
+ * @param oldMonth 
+ * @param oldDay 
+ * @param newYear 
+ * @param newMonth 
+ * @param isStrict 
+ * @returns 
+ */
+function getRemanagedDayInMonth(oldYear: number, oldMonth: number, oldDay: number, newYear: number, newMonth: number, isStrict: boolean): RemanagedDayInMonth {
+  const ddata = getDayInMonth(oldYear, oldMonth, oldDay);
+  const mdata = getMonthWeekStatistics(newYear, newMonth);
+  const days = MONTH_DAY_COUNT[newMonth - 1]! + ((newMonth == 2 && isLeapYear(newYear)) ? 1 : 0);
+  const firstDayOfWeek = dayOfWeek(newYear, newMonth, 1);
+  //let lastDayOfWeek = (firstDayOfWeek + days - 1) % 7;
+
+  let methodA = undefined;
+  let methodB = undefined;
+  if (isStrict) {
+    methodA = ddata[0] > days ? undefined : ddata[0];
+    methodB = ddata[1] > days ? undefined : (days - ddata[1] + 1);
+  } else {
+    methodA = Math.min(ddata[0], days);
+    methodB = days - Math.min(ddata[1], days) + 1;
+  }
+
+  let methodC = undefined;
+  if (ddata[2] <= mdata[ddata[3]]! || !isStrict) {
+    const targetWeek = Math.min(ddata[2], mdata[ddata[3]]!);
+    methodC = 1 + (targetWeek - 1) * 7 + ((ddata[3] + 7 - firstDayOfWeek) % 7);
+  }
+
+  let methodD = undefined;
+  if (ddata[4] <= mdata[ddata[5]]! || !isStrict) {
+    // convert to type c and calc
+    const targetWeek = mdata[ddata[5]]! - Math.min(ddata[4], mdata[ddata[5]]!) + 1;
+    methodD = 1 + (targetWeek - 1) * 7 + ((ddata[5] + 7 - firstDayOfWeek) % 7);
+  }
+
+  return [methodA, methodB, methodC, methodD];
+}
+
+type MonthWeekStatistics = [
+  /** The count of Youbi1 presented in this month. */
+  youbi1: number,
+  /** The count of Youbi2 presented in this month. */
+  youbi2: number,
+  /** The count of Youbi3 presented in this month. */
+  youbi3: number,
+  /** The count of Youbi4 presented in this month. */
+  youbi4: number,
+  /** The count of Youbi5 presented in this month. */
+  youbi5: number,
+  /** The count of Youbi6 presented in this month. */
+  youbi6: number,
+  /** The count of Youbi7 presented in this month. */
+  youbi7: number,
+];
+
+function getMonthWeekStatistics(year: number, month: number): MonthWeekStatistics {
+  const days = MONTH_DAY_COUNT[month - 1]! + ((month == 2 && isLeapYear(year)) ? 1 : 0);
+  const firstDayOfWeek = dayOfWeek(year, month, 1);
+
+  const result: MonthWeekStatistics = [4, 4, 4, 4, 4, 4, 4];
+  let remain = days % 7;
+  let week = firstDayOfWeek;
+  while (remain > 0) {
+    result[week % 7]! += 1;
+    week++;
+    remain--;
+  }
+
+  return result;
+}
+
+export function isLeapYear(year: number): boolean {
+  let isLeap = false;
+  if (year % 4 == 0) isLeap = true;
+  if (year % 100 == 0) isLeap = false;
+  if (year % 400 == 0) isLeap = true;
+  return isLeap;
+}
+
+// endregion
+

frontend/src/utils/i18n.ts

@@ -0,0 +1,66 @@
+export enum Language {
+    English,
+    SimplifiedChinese,
+}
+
+/**
+ * 
+ * @param month Zero-based month.
+ * @returns 
+ */
+export function universalGetMonth(month: number): string {
+    switch (month) {
+        case 0:
+            return "January";
+        case 1:
+            return "February";
+        case 2:
+            return "March";
+        case 3:
+            return "April";
+        case 4:
+            return "May";
+        case 5:
+            return "June";
+        case 6:
+            return "July";
+        case 7:
+            return "August";
+        case 8:
+            return "September";
+        case 9:
+            return "October";
+        case 10:
+            return "November";
+        case 11:
+            return "December";
+        default:
+            return ""
+    }
+}
+
+/**
+ * 
+ * @param dayOfWeek Zero-based day of week
+ * @returns 
+ */
+export function universalGetDayOfWeek(dayOfWeek: number): string {
+    switch (dayOfWeek) {
+        case 0:
+            return "Monday";
+        case 1:
+            return "Tuesday";
+        case 2:
+            return "Wednesday";
+        case 3:
+            return "Thursday";
+        case 4:
+            return "Friday";
+        case 5:
+            return "Saturday";
+        case 6:
+            return "Sunday";
+        default:
+            return "";
+    }
+}

frontend/src/utils/utils.ts

@@ -0,0 +1,40 @@
+
+export const DEFAULT_COLOR: string = '#536dfe';
+
+export function gcd(a: number, b: number): number {
+  if (b == 0) return a;
+  return gcd(b, a % b);
+}
+
+export function lcm(a: number, b: number): number {
+  return a / gcd(a, b) * b;
+}
+
+/**
+ * 将字符串中的 `{n}` 占位符替换为对应的参数值
+ * @param str 目标字符串，若为 `null`/`undefined`/空字符串则返回原值或空串（根据需求）
+ * @param args 用于替换的值列表
+ * @returns 格式化后的字符串
+ */
+export function format(str: string, ...args: any[]): string {
+  // 若 str 为假值（null/undefined/''），直接返回空字符串
+  if (!str) return '';
+
+  return str.replace(/\{(\d+)\}/g, (match, index) => {
+    const idx = parseInt(index, 10);
+    const value = args[idx];
+    // 若参数存在且不为 null/undefined，则转为字符串，否则保留占位符
+    return value != null ? String(value) : match;
+  });
+}
+
+/**
+ * Get Monday-first the day of week from given date instead of Sunday-first.
+ * @param date The date for getting weekday.
+ * @returns The zero-based weekday. 0 stands for Monday.
+ */
+export function getWeekday(date: Date): number {
+  const day = date.getDay();
+  if (day == 0) return 6;
+  else return day - 1;
+}

frontend/src/views/Admin.vue

@@ -0,0 +1,8 @@
+<script setup lang="ts"></script>
+
+<template>
+  <h1>Congratulations</h1>
+  <p>This is admin.</p>
+</template>
+
+<style scoped></style>

frontend/src/views/Calendar.vue

@@ -0,0 +1,344 @@
+<script setup lang="ts">
+import { computed, onMounted, ref, watch } from 'vue';
+import { useRouter } from 'vue-router';
+import { useTokenStore } from '@/stores/token';
+import MessageBox from '@/components/MessageBox.vue';
+import DateTimePicker, { TabType } from '@/components/DateTimePicker.vue';
+import CalendarGrid from '@/components/calendar/CalendarGrid.vue';
+import ScheduleList from '@/components/calendar/ScheduleList.vue';
+import CollectionToggleItem from '@/components/calendar/CollectionToggleItem.vue';
+import type { DisplayDay, DisplayEvent } from '@/components/calendar/types';
+import {
+  getFull as apiCalendarGetFull,
+  deserializeDescription,
+  type CalendarRow,
+} from '@/api/calendar';
+import {
+  getFullOwn as apiCollectionGetFullOwn,
+  getShared as apiCollectionGetShared,
+  type CollectionRow,
+  type SharedCollectionRow,
+} from '@/api/collection';
+import {
+  DAY1_SPAN,
+  dayOfWeek,
+  resolveLoopRules2Event,
+  resolveLoopRules4Text,
+} from '@/utils/datetime';
+import { MONTH_NAMES, WEEK_NAMES } from '@/utils/calendar-names';
+
+const token = useTokenStore();
+const router = useRouter();
+
+const messagebox = ref<InstanceType<typeof MessageBox>>();
+const picker = ref<InstanceType<typeof DateTimePicker>>();
+
+const activeTab = ref<number>(1);
+
+// The viewed month cursor. Only year + month are meaningful; the time-of-day
+// participates in the grid start timestamp exactly like the legacy code.
+const currentMonth = ref<Date>(new Date());
+
+// Raw event rows covering the current grid window.
+const eventsCache = ref<CalendarRow[]>([]);
+
+// Collection lists for tab 2.
+const ownedCollections = ref<CollectionRow[]>([]);
+const sharedCollections = ref<SharedCollectionRow[]>([]);
+
+// Per-collection visibility flags, keyed by collection uuid. Default (absent)
+// means hidden, matching the legacy behaviour where missing cache entries are
+// treated as false.
+const ownedVisible = ref<Map<string, boolean>>(new Map());
+const sharedVisible = ref<Map<string, boolean>>(new Map());
+
+// region: Computed grid window and analyzed display data
+
+const gridYear = computed(() => currentMonth.value.getFullYear());
+const gridMonth = computed(() => currentMonth.value.getMonth() + 1);
+const firstDow = computed(() => dayOfWeek(gridYear.value, gridMonth.value, 1));
+const gridStartTimestamp = computed(() =>
+  Math.floor(currentMonth.value.getTime() / 60000) - firstDow.value * DAY1_SPAN
+);
+const gridEndTimestamp = computed(() => gridStartTimestamp.value + DAY1_SPAN * 6 * 7 - 1);
+
+const textMonth = computed(() => `${gridYear.value} - ${MONTH_NAMES[gridMonth.value - 1]}`);
+
+const myTimezoneOffset = computed(() => -(new Date().getTimezoneOffset()));
+
+// Port of ccn_calendar_calendar_Analyse: build the 42-cell display cache,
+// expand loop events and split occurrences that cross day boundaries.
+const displayDays = computed<DisplayDay[]>(() => {
+  const startTimestamp = gridStartTimestamp.value;
+  const endTimestamp = gridEndTimestamp.value;
+  const gottenMonth = gridMonth.value;
+  const myTz = myTimezoneOffset.value;
+
+  // Build the 42 day cells.
+  const days: DisplayDay[] = [];
+  const cursor = new Date(startTimestamp * 60000);
+  for (let i = 0; i < 6 * 7; i++) {
+    days.push({
+      month: cursor.getMonth() + 1,
+      day: cursor.getDate(),
+      dayOfWeek: (cursor.getDay() === 0 ? 6 : cursor.getDay() - 1) + 1,
+      isCurrentMonth: (cursor.getMonth() + 1) === gottenMonth,
+      subcalendar: '',
+      events: [],
+    });
+    cursor.setTime(cursor.getTime() + DAY1_SPAN * 60000);
+  }
+
+  // Expand and place each event.
+  for (const item of eventsCache.value) {
+    const deserialized = deserializeDescription(item[3]);
+    const minStartTimestamp = startTimestamp - (item[6] - item[5]);
+    const result = resolveLoopRules2Event(
+      item[8],
+      item[9] < minStartTimestamp ? minStartTimestamp : item[9],
+      Math.min(item[10], endTimestamp),
+      item[5],
+      item[6],
+      item[7],
+      startTimestamp
+    );
+    if (typeof result === 'undefined') continue;
+
+    const loopText = resolveLoopRules4Text(item[8], item[5], item[7]);
+    const timezoneWarning = myTz !== item[7];
+
+    for (const it of result) {
+      const eventDateTime = new Date(it[0] * 60000);
+      let count = Math.floor((it[0] - startTimestamp) / DAY1_SPAN);
+      let exitFlag = false;
+      while (count < 6 * 7) {
+        // NOTE: legacy indexes the owned cache by the *event* uuid (item[0]),
+        // which is collection-keyed, so this is always false. Kept faithful.
+        const isLocked = ownedVisible.value.has(item[0]);
+        const belongVisible = ownedVisible.value.get(item[1]) || sharedVisible.value.get(item[1]) || false;
+        const eventItem: DisplayEvent = {
+          uuid: item[0],
+          belongTo: item[1],
+          title: item[2],
+          description: deserialized.description,
+          color: deserialized.color,
+          isVisible: belongVisible,
+          isLocked,
+          loopText,
+          timezoneWarning,
+          start: eventDateTime.toLocaleTimeString(),
+          end: '',
+        };
+        eventDateTime.setHours(23, 59, 0, 0);
+        if (it[1] <= Math.floor(eventDateTime.getTime() / 60000)) {
+          exitFlag = true;
+          eventDateTime.setTime(it[1] * 60000);
+        }
+        eventItem.end = eventDateTime.toLocaleTimeString();
+        days[count]!.events.push(eventItem);
+        if (exitFlag) break;
+        eventDateTime.setMinutes(eventDateTime.getMinutes() + 1, 0, 0);
+        count++;
+      }
+    }
+  }
+
+  return days;
+});
+
+// endregion
+
+// region: Data fetching
+
+const refreshEvents = async () => {
+  const rv = await apiCalendarGetFull(token.currentToken, gridStartTimestamp.value, gridEndTimestamp.value);
+  eventsCache.value = typeof rv === 'undefined' ? [] : rv;
+};
+
+const refreshCollections = async () => {
+  const newOwned = new Map<string, boolean>();
+  const newShared = new Map<string, boolean>();
+
+  const sharedRv = await apiCollectionGetShared(token.currentToken);
+  sharedCollections.value = typeof sharedRv === 'undefined' ? [] : sharedRv;
+  if (sharedCollections.value.length > 0) {
+    for (const item of sharedCollections.value) {
+      newShared.set(item[0], true);
+    }
+  }
+
+  const ownedRv = await apiCollectionGetFullOwn(token.currentToken);
+  ownedCollections.value = typeof ownedRv === 'undefined' ? [] : ownedRv;
+  if (ownedCollections.value.length > 0) {
+    for (const item of ownedCollections.value) {
+      newOwned.set(item[0], true);
+    }
+  }
+
+  ownedVisible.value = newOwned;
+  sharedVisible.value = newShared;
+};
+
+// endregion
+
+// region: Navigation
+
+const prevMonth = () => {
+  const d = new Date(currentMonth.value);
+  d.setMonth(d.getMonth() - 1);
+  currentMonth.value = d;
+};
+
+const nextMonth = () => {
+  const d = new Date(currentMonth.value);
+  d.setMonth(d.getMonth() + 1);
+  currentMonth.value = d;
+};
+
+const today = () => {
+  currentMonth.value = new Date();
+};
+
+const jump = () => {
+  picker.value?.modal(currentMonth.value, TabType.Month);
+};
+
+const onPickerConfirm = (date: Date) => {
+  currentMonth.value = date;
+};
+
+const addEvent = () => {
+  router.push({ name: 'CalendarEventAdd' });
+};
+
+const editEvent = (uuid: string) => {
+  router.push({ name: 'CalendarEventUpdate', params: { uuid } });
+};
+
+// endregion
+
+// region: Collection visibility toggles
+
+const toggleOwned = (uuid: string) => {
+  const m = new Map(ownedVisible.value);
+  m.set(uuid, !m.get(uuid));
+  ownedVisible.value = m;
+};
+
+const toggleShared = (uuid: string) => {
+  const m = new Map(sharedVisible.value);
+  m.set(uuid, !m.get(uuid));
+  sharedVisible.value = m;
+};
+
+// endregion
+
+watch(currentMonth, () => { refreshEvents(); });
+
+onMounted(async () => {
+  await refreshCollections();
+  await refreshEvents();
+});
+</script>
+
+<template>
+  <div class="container" style="margin-top: 20px;">
+    <div class="tabs">
+      <ul>
+        <li :class="{ 'is-active': activeTab === 1 }" @click="activeTab = 1"><a>Calendar</a></li>
+        <li :class="{ 'is-active': activeTab === 2 }" @click="activeTab = 2"><a>Collection</a></li>
+        <li :class="{ 'is-active': activeTab === 3 }" @click="activeTab = 3"><a>Display</a></li>
+      </ul>
+    </div>
+  </div>
+
+  <!-- Tab 1: Calendar -->
+  <div v-show="activeTab === 1" class="container" style="margin-top: 20px;">
+    <nav class="level is-mobile">
+      <div class="level-left">
+        <div class="level-item control">
+          <a class="button" @click="prevMonth">
+            <span class="icon is-small"><font-awesome-icon icon="fas fa-chevron-circle-left"></font-awesome-icon></span>
+          </a>
+        </div>
+      </div>
+      <div class="level-item control">
+        <a class="button" @click="jump">
+          <span>{{ textMonth }}</span>
+        </a>
+      </div>
+      <div class="level-right">
+        <div class="level-item control">
+          <a class="button" @click="nextMonth">
+            <span class="icon is-small"><font-awesome-icon icon="fas fa-chevron-circle-right"></font-awesome-icon></span>
+          </a>
+        </div>
+      </div>
+    </nav>
+    <nav class="level is-mobile">
+      <div class="level-item control">
+        <a class="button is-info" @click="today">Today</a>
+      </div>
+      <div class="level-item control">
+        <a class="button is-primary" @click="addEvent">Add...</a>
+      </div>
+    </nav>
+
+    <div class="card" style="padding: 1.25rem;">
+      <CalendarGrid :cells="displayDays" :week-names="WEEK_NAMES" @event-click="editEvent" />
+    </div>
+
+    <div class="container" style="padding: 1.25rem; display: flex; flex-flow: column; margin-top: 1.25rem;">
+      <h1 class="title">Schedule</h1>
+      <ScheduleList :days="displayDays" @event-click="editEvent" />
+    </div>
+  </div>
+
+  <!-- Tab 2: Collection -->
+  <div v-show="activeTab === 2" class="container" style="margin-top: 20px;">
+    <div class="control" style="margin: 0.75rem;">
+      <a class="button is-primary" @click="refreshCollections">
+        <span class="icon is-small"><font-awesome-icon icon="fas fa-sync"></font-awesome-icon></span>
+      </a>
+    </div>
+    <h1 class="title">My collections</h1>
+    <div style="display: flex; flex-flow: column; margin-top: 1.25rem; margin-bottom: 1.25rem;">
+      <CollectionToggleItem v-for="item in ownedCollections" :key="item[0]" :name="item[1]"
+        :is-show="ownedVisible.get(item[0]) || false" @toggle="toggleOwned(item[0])" />
+    </div>
+    <h1 class="title">Shared collections</h1>
+    <div style="display: flex; flex-flow: column; margin-top: 1.25rem; margin-bottom: 1.25rem;">
+      <CollectionToggleItem v-for="item in sharedCollections" :key="item[0]" :name="item[1]" :subtitle="item[2]"
+        :is-show="sharedVisible.get(item[0]) || false" @toggle="toggleShared(item[0])" />
+    </div>
+  </div>
+
+  <!-- Tab 3: Display (legacy dead UI, reproduced as-is) -->
+  <div v-show="activeTab === 3" class="container" style="margin-top: 20px;">
+    <div class="field">
+      <label class="label">The first day of week</label>
+      <div class="control">
+        <div class="select">
+          <select>
+            <option v-for="(name, i) in WEEK_NAMES" :key="i">{{ name }}</option>
+          </select>
+        </div>
+      </div>
+    </div>
+    <div class="field">
+      <label class="label">Sub-Calendar</label>
+      <div class="control">
+        <div class="select">
+          <select>
+            <option>Chinese Lunisolar Calendar</option>
+          </select>
+        </div>
+      </div>
+    </div>
+  </div>
+
+  <MessageBox ref="messagebox" />
+  <DateTimePicker ref="picker" @confirm="onPickerConfirm" />
+</template>
+
+<style scoped></style>