import enum
import argparse
from dataclasses import dataclass
from pathlib import Path
from typing import TypeVar, cast
from common import Circuit, CircuitDeviceScale, JointKind
from dataset import (
    DatasetCollection,
    to_human_readable_value,
    from_human_readable_value,
)
from query import Response
from resolver import Resolver, LutResolver, AStarResolver

_T = TypeVar("_T", bound=str)


class AppResolver(enum.StrEnum):
    """
    The resolver for the app.
    """

    LUT = "lut"
    """The look-up table resolver."""
    ASTAR = "astar"
    """The A* resolver."""


@dataclass
class AppConfig:
    """
    The configuration for the app.
    """

    resolver: AppResolver
    """The resolver for the app."""

    resistor_dataset: Path
    """The path to the resistor dataset file."""
    capacitor_dataset: Path
    """The path to the capacitor dataset file."""
    inductor_dataset: Path
    """The path to the inductor dataset file."""


class App:
    """
    The app.
    """

    __config: AppConfig
    """The configuration for the app."""
    __dataset: DatasetCollection
    """The dataset for the app."""
    __resolver: Resolver
    """The resolver for the app."""

    def __init__(self, config: AppConfig) -> None:
        self.__config = config
        self.__dataset = DatasetCollection.from_file(
            self.__config.resistor_dataset,
            self.__config.capacitor_dataset,
            self.__config.inductor_dataset,
        )
        match self.__config.resolver:
            case AppResolver.LUT:
                self.__resolver = LutResolver(self.__dataset)
            case AppResolver.ASTAR:
                self.__resolver = AStarResolver(self.__dataset)

    def run(self) -> None:
        """
        Run the app.
        """
        print("LCR Connector")
        print('Type "help" for more info. Type "exit" to quit.')
        print("query: do a query.")
        print("help: show all command.")
        print("exit: exit this app.")

        while True:
            shit = self.__accept_command(("query", "help", "exit"))
            match self.__accept_command(("query", "help", "exit")):
                case "query":
                    self.__op_query()
                case "help":
                    print("LCR Connector Help:")
                    print("")
                    print("query: do a query.")
                    print("help: show all command.")
                    print("exit: exit this app.")
                case "exit":
                    break

    def __op_query(self) -> None:
        pass

    def __op_page_viewer(self, response: Response) -> None:
        cnt = len(response)
        if cnt == 0:
            print("Sorry, no result!")
            print("Please consider adjusting your requirements and try again.")
            return

        ITEMS_PER_PAGE: int = 10
        all_page = cnt // ITEMS_PER_PAGE
        current_page = 0

        while True:
            # print list
            for i in range(ITEMS_PER_PAGE - 1):
                # build index and check it
                index = current_page * (ITEMS_PER_PAGE - 1) + i
                if index >= cnt:
                    continue
                # fetch item and print it
                item = response[index]
                print(
                    "Plan {0}\t{1}\t{2:.2%}".format(
                        index + 1,
                        to_human_readable_value(item.value),
                        item.relative_difference,
                    )
                )
            # print page footer
            print("")
            print("Page {} of {}.".format(current_page + 1, all_page + 1))
            print("f: previous page. b: next page. q: quit this viewer.")
            # check command
            match self.__accept_command(("f", "b", "q")):
                case "f":
                    current_page = max(0, current_page - 1)
                case "b":
                    current_page = min(all_page, current_page + 1)
                case "q":
                    break

    def __accept_command(self, valid_commands: tuple[_T, ...]) -> _T:
        while True:
            print("> ", end=None)
            words = input()
            words = words.strip()
            if words in valid_commands:
                return cast(_T, words)
            print("Unknown command, please try again.")

    def __accept_value_input(self) -> float:
        while True:
            words = input()

            try:
                pending = from_human_readable_value(words)
            except ValueError:
                print("Wrong value, please try again.")
                continue

            if pending > 0:
                return pending
            else:
                print("Value out of range, please try again.")

    def __get_joint_kind_symbol(self, joint_kind: JointKind) -> str:
        match joint_kind:
            case JointKind.SERIES:
                return "S"
            case JointKind.PARALLEL:
                return "P"

    def __illustrate_circuit(self, circuit: Circuit) -> None:
        match circuit.device_scale:
            case CircuitDeviceScale.ONE:
                dev1 = to_human_readable_value(circuit.first_device_value)
                print(f"{dev1}")
            case CircuitDeviceScale.TWO:
                dev1 = to_human_readable_value(circuit.first_device_value)
                j2 = self.__get_joint_kind_symbol(circuit.second_device_joint)
                dev2 = to_human_readable_value(circuit.second_device_value)
                print(f"[{j2}] ┬ {dev1}")
                print(f"    └ {dev2}")
            case CircuitDeviceScale.THREE:
                dev1 = to_human_readable_value(circuit.first_device_value)
                j2 = self.__get_joint_kind_symbol(circuit.second_device_joint)
                dev2 = to_human_readable_value(circuit.second_device_value)
                j3 = self.__get_joint_kind_symbol(circuit.third_device_joint)
                dev3 = to_human_readable_value(circuit.third_device_value)
                print(f"[{j3}] ┬ [{j2}] ┬ {dev1}")
                print(f"    │     └ {dev2}")
                print(f"    └ {dev3}")


if __name__ == "__main__":
    parser = argparse.ArgumentParser(
        prog="LCR Connector",
        description="Get the resistor, capacitor, or inductor circuit which has the closest value for your given value within at most 3 devices.",
    )
    parser.add_argument(
        "-s",
        "--resolver",
        dest="resolver",
        action="store",
        type=AppResolver,
        choices=[resolver.value for resolver in AppResolver],
        required=True,
        help="The resolver you want to use",
    )
    parser.add_argument(
        "-r",
        "--resistor",
        dest="resistor_dataset",
        action="store",
        type=Path,
        required=True,
        help="The path to the resistor dataset file",
        metavar="RESISTOR.TXT",
    )
    parser.add_argument(
        "-l",
        "--inductor",
        dest="inductor_dataset",
        action="store",
        type=Path,
        required=True,
        help="The path to the inductor dataset file",
        metavar="INDUCTOR.TXT",
    )
    parser.add_argument(
        "-c",
        "--capacitor",
        dest="capacitor_dataset",
        action="store",
        type=Path,
        required=True,
        help="The path to the capacitor dataset file",
        metavar="CAPACITOR.TXT",
    )

    args = parser.parse_args()
    app_config = AppConfig(
        resolver=args.resolver,
        resistor_dataset=args.resistor_dataset,
        capacitor_dataset=args.capacitor_dataset,
        inductor_dataset=args.inductor_dataset,
    )
    app = App(app_config)
    app.run()