package app

import (
	"gitea.neur0tx.site/Neur0toxine/vegapokerbot/internal/config"
	"gitea.neur0tx.site/Neur0toxine/vegapokerbot/internal/db"
	"gitea.neur0tx.site/Neur0toxine/vegapokerbot/internal/handler"
	"gitea.neur0tx.site/Neur0toxine/vegapokerbot/internal/handler/iface"
	"gitea.neur0tx.site/Neur0toxine/vegapokerbot/internal/locale"
	"gitea.neur0tx.site/Neur0toxine/vegapokerbot/internal/logger"
	"github.com/mymmrac/telego"
	"go.uber.org/zap"
	"gorm.io/gorm"
	"net/url"
)

type App struct {
	Logger       *zap.SugaredLogger
	Telegram     *telego.Bot
	BotProfile   *telego.User
	Config       *config.Config
	Repositories *db.Repositories
	Handlers     map[handler.Type]handler.Handler
	db           *gorm.DB
}

func (a *App) Start() error {
	if err := a.loadConfig(); err != nil {
		return err
	}
	if err := a.initLogger(); err != nil {
		return err
	}
	if a.Config.Debug {
		a.Logger.Debugf("loaded configuration: %+v", a.Config)
	}
	if err := a.migrateDB(); err != nil {
		return err
	}
	if err := a.initDB(); err != nil {
		return err
	}
	if err := a.initTelegram(); err != nil {
		return err
	}
	a.initHandlers()
	a.Logger.Info("Vega Poker Bot is running")
	if a.Config.Listen == "" || !a.isValidURL(a.Config.WebhookURL) {
		return a.longPoll()
	}
	return a.listenWebhook()
}

func (a *App) Log() *zap.SugaredLogger {
	return a.Logger
}

func (a *App) TG() *telego.Bot {
	return a.Telegram
}

func (a *App) TGProfile() *telego.User {
	return a.BotProfile
}

func (a *App) Conf() *config.Config {
	return a.Config
}

func (a *App) DB() iface.Repositories {
	return &DBWrapper{a.Repositories}
}

func (a *App) Localizer(lang string) locale.Localizer {
	return locale.For(lang)
}

func (a *App) loadConfig() error {
	config, err := config.LoadConfig()
	if err != nil {
		return err
	}
	a.Config = config
	return nil
}

func (a *App) initLogger() error {
	var err error
	a.Logger, err = logger.NewLogger(a.Config.Debug)
	return err
}

func (a *App) migrateDB() error {
	return db.Migrate(a.Config.PostgresDSN)
}

func (a *App) initDB() error {
	conn, err := db.Connect(a.Config.PostgresDSN)
	if err != nil {
		return err
	}
	a.Repositories = db.InitRepositories(conn)
	return nil
}

func (a *App) initTelegram() error {
	var err error
	a.Telegram, err = telego.NewBot(a.Config.TelegramToken, logger.WrapForTelego(a.Logger, a.Config.Debug))
	if err != nil {
		return err
	}
	a.BotProfile, err = a.Telegram.GetMe()
	return err
}

func (a *App) initHandlers() {
	a.Handlers = map[handler.Type]handler.Handler{
		handler.Noop:              handler.NewNoopHandler(a.Logger, a.Config.Debug),
		handler.Message:           handler.NewMessageHandler(a),
		handler.ChatMemberUpdated: handler.NewChatMemberUpdatedHandler(a),
		handler.CallbackQuery:     handler.NewCallbackQueryHandler(a),
	}
}

func (a *App) handler(update telego.Update) handler.Handler {
	if update.Message != nil {
		return a.Handlers[handler.Message]
	}
	if update.MyChatMember != nil {
		return a.Handlers[handler.ChatMemberUpdated]
	}
	if update.CallbackQuery != nil {
		return a.Handlers[handler.CallbackQuery]
	}
	return a.Handlers[handler.Noop]
}

func (a *App) processUpdate(update telego.Update) {
	defer func() {
		if r := recover(); r != nil {
			a.Logger.Errorf("recovered from panic inside the handler: %v", r)
		}
	}()
	if err := a.handler(update).Handle(update); err != nil {
		a.Logger.Errorf("error while handling the update: %s", err)
	}
}

func (a *App) longPoll() error {
	_ = a.Telegram.DeleteWebhook(&telego.DeleteWebhookParams{})
	updates, err := a.Telegram.UpdatesViaLongPolling(nil)
	if err != nil {
		return err
	}
	defer a.Telegram.StopLongPolling()
	for update := range updates {
		go a.processUpdate(update)
	}
	return nil
}

func (a *App) listenWebhook() error {
	uri, _ := url.Parse(a.Config.WebhookURL)
	err := a.Telegram.SetWebhook(&telego.SetWebhookParams{
		URL: a.Config.WebhookURL,
	})
	if err != nil {
		return err
	}

	a.Logger.Debugf("fetching updates from webhook: %s", uri.Path)
	updates, err := a.Telegram.UpdatesViaWebhook(uri.Path)
	if err != nil {
		return err
	}
	go func() {
		_ = a.Telegram.StartWebhook(a.Config.Listen)
	}()
	defer func() {
		_ = a.Telegram.StopWebhook()
	}()
	for update := range updates {
		go a.processUpdate(update)
	}
	return nil
}

func (a *App) isValidURL(uri string) bool {
	if uri == "" {
		return false
	}
	_, err := url.Parse(uri)
	return err == nil
}