package main

import (
	"context"
	"database/sql"
	"flag"
	"log"
	"log/slog"
	"net/http"
	"os"
	"time"

	"gitea.local.lab/Lbenedar/foundry_helper_service/internal/foundry"
	"gitea.local.lab/Lbenedar/foundry_helper_service/internal/foundry/requests"
	"gitea.local.lab/Lbenedar/foundry_helper_service/internal/foundry/transport"

	_ "github.com/mattn/go-sqlite3"
)

type service_mode string

const (
	API_MODE         = "api"
	DISCORD_BOT_MODE = "discord"
	TG_BOT_MODE      = "tg"
)

type config struct {
	mode service_mode
	port string

	db struct {
		dsn          string
		maxOpenConns int
		maxIdleConns int
		maxIdleTime  string
	}
}

type application struct {
	cfg        config
	foundryApp *foundry.FoundryApi
	slogger    *slog.Logger
	logger     *log.Logger
}

func openDB(cfg config) (*sql.DB, error) {
	db, err := sql.Open("sqlite3", cfg.db.dsn)
	if err != nil {
		return nil, err
	}

	db.SetMaxIdleConns(cfg.db.maxIdleConns)
	db.SetMaxOpenConns(cfg.db.maxOpenConns)

	duration, err := time.ParseDuration(cfg.db.maxIdleTime)
	if err != nil {
		return nil, err
	}
	db.SetConnMaxIdleTime(duration)

	ctx, cancel := context.WithTimeout(context.Background(), 5*time.Second)
	defer cancel()

	err = db.PingContext(ctx)
	if err != nil {
		return nil, err
	}
	return db, nil
}

// TODO: change default values
func (app *application) parseFlags() *requests.FoundryHttpRequest {
	flag.StringVar(&app.cfg.port, "port", ":9090", "Service port")

	flag.StringVar(&app.cfg.db.dsn, "db-dsn", "file:db/default.db?cache=shared", "PostgreSQL DSN")
	flag.IntVar(&app.cfg.db.maxOpenConns, "db-max-open-conns", 25, "PostgreSQL max open connections")
	flag.IntVar(&app.cfg.db.maxIdleConns, "db-max-idle-conns", 25, "PostgreSQL max idle connections")
	flag.StringVar(&app.cfg.db.maxIdleTime, "db-max-idle-time", "15m", "PostgreSQL max connection idle time")

	var mode string
	flag.StringVar(&mode, "service_mode", "api", "Type of service mode(api|discord|tg)")

	foundryHttpData := requests.FoundryHttpRequest{SessionID: ""}
	flag.StringVar(&foundryHttpData.Host, "foundry_host", "127.0.0.1", "Address to connect to Foundry")
	flag.StringVar(&foundryHttpData.Password, "foundry_pass", "", "Password to connect to Foundry")

	var logLevelStr string
	flag.StringVar(&logLevelStr, "log_level", "info", "Password to connect to Foundry(debug|info|warn|error)")

	flag.Parse()

	app.cfg.mode = service_mode(mode)
	// app.foundryApp.SetConfig(&foundryConfig)

	logLevel, ok := StringToLogLevel[logLevelStr]
	if !ok {
		logLevel = slog.LevelInfo
	}

	app.slogger = slog.New(slog.NewJSONHandler(os.Stdout, &slog.HandlerOptions{Level: logLevel}))
	if !ok {
		app.slogger.Warn("Wrong log level. Started with log_level=info", "received", logLevelStr)
	}
	return &foundryHttpData
}

// TODO: Handle application exit if wrong data
func (app *application) StartListenFoundry() {
	var err error

	for {
		err = app.foundryApp.ConnectToWebSocket()
		if err != nil {
			app.slogger.Error("Error raised", "err", err.Error())
			return
		}
	}
}

func main() {
	app := application{foundryApp: &foundry.FoundryApi{}}

	foundryHttpData := app.parseFlags()

	app.slogger.Info("", "dsn", app.cfg.db.dsn)

	db, err := openDB(app.cfg)
	if err != nil {
		app.slogger.Error("Error when opening database connection", "err", err)
		return
	}
	defer db.Close()
	app.slogger.Info("Database connection pool established")

	app.foundryApp.Transport = transport.NewFoundryTransport(db, app.slogger, foundryHttpData)
	go app.StartListenFoundry()

	errLog := slog.NewLogLogger(app.slogger.Handler(), slog.LevelError)
	server := &http.Server{
		Addr:     app.cfg.port,
		Handler:  app.routes(),
		ErrorLog: errLog,
		// TLSConfig:    tlsConfig,
		IdleTimeout:  time.Minute,
		ReadTimeout:  5 * time.Second,
		WriteTimeout: 10 * time.Second,
	}

	switch app.cfg.mode {
	case API_MODE:
		app.slogger.Info("Server is started", "port", app.cfg.port)
		server.ListenAndServe()
	case DISCORD_BOT_MODE:
		app.slogger.Warn("TODO: implement this mode")
	case TG_BOT_MODE:
		app.slogger.Warn("TODO: implement this mode")
	default:
		app.slogger.Error("Wrong Mode. Should be one of: 'api', 'discord', 'tg'", "mode", app.cfg.mode)
	}
}