// main.go
package main

import (
	"fmt"
	"os"

	"github.com/yyc12345/coconut-leaf/backend/cli"
	"github.com/yyc12345/coconut-leaf/backend/config"
	"github.com/yyc12345/coconut-leaf/backend/database"
	"github.com/yyc12345/coconut-leaf/backend/logger"
	"github.com/yyc12345/coconut-leaf/backend/server"
	"github.com/yyc12345/coconut-leaf/backend/utils"
)

func main() {
	args := cli.Parse()

	cfg, err := config.Load(args.Config)
	if err != nil {
		fmt.Fprintln(os.Stderr, "error loading config file:", err)
		os.Exit(1)
	}

	// Splash is printed directly; the logger is not built yet.
	fmt.Println("Coconut-leaf")
	fmt.Println("A light, self-host and multi-account calendar system")
	fmt.Println("Project: https://github.com/yyc12345/coconut-leaf")
	fmt.Println("===================")

	// Build the logger from the loaded config.
	loggerLevel := logger.Production
	if cfg.Others.Debug {
		loggerLevel = logger.Development
	}
	log := logger.New(loggerLevel)

	// Create the database backend selected by the config.
	deps := database.Deps{Cfg: cfg, Logger: log}
	var db database.Database
	switch cfg.Database.Driver {
	case config.DatabaseDriverSqlite:
		db, err = database.NewSqlite3Database(deps)
	case config.DatabaseDriverMysql:
		db, err = database.NewMysqlDatabase(deps)
	default:
		log.Error("unknown database driver", "driver", cfg.Database.Driver)
		os.Exit(1)
	}
	if err != nil {
		log.Error("failed to open database", "error", err)
		os.Exit(1)
	}

	// Initialize the schema and first admin user when requested.
	if args.Init {
		if !utils.IsValidUsername(args.Username) {
			log.Error("invalid init username")
			os.Exit(1)
		}
		if !utils.IsValidPassword(args.Password) {
			log.Error("invalid init password")
			os.Exit(1)
		}
		if err := db.Init(args.Username, args.Password); err != nil {
			log.Error("failed to initialize database", "error", err)
			os.Exit(1)
		}
	}

	// Serve.
	defer db.Close()
	log.Info("Starting server...")
	handler := &server.Handler{DB: db, Logger: log, Cfg: cfg}
	if err := server.Run(handler); err != nil {
		log.Error("server stopped with error", "error", err)
		os.Exit(1)
	}
}