// Fantasy World Zookeeper Helper Bot
// Copyright (c) 2018 Vladimir "fat0troll" Hodakov

package telegram

import (
	"fmt"
	tdlib "github.com/Arman92/go-tdlib"
	"source.hodakov.me/fat0troll/fwzookeeper_helper/context"
	"source.hodakov.me/fat0troll/fwzookeeper_helper/domains/announces/v1"
)

// Authenticate connects instance to Telegram
// At first launch we need to login manually - there is no way to automate
// Telegram login
func Authenticate() {
	if c.Config.TDLib.APIHash == "" {
		log.Error().Msg("APIHash is empty")
		return
	}
	if c.Config.TDLib.APIID == "" {
		log.Error().Msg("APIID is empty")
		return
	}
	tdlib.SetLogVerbosityLevel(1)
	tdlib.SetFilePath(c.Config.TDLib.ErrorsFile)

	// Create new instance of client
	client = tdlib.NewClient(tdlib.Config{
		APIID:               c.Config.TDLib.APIID,
		APIHash:             c.Config.TDLib.APIHash,
		SystemLanguageCode:  "en",
		DeviceModel:         "fw_zookeeper_helper",
		SystemVersion:       context.VERSION,
		ApplicationVersion:  context.VERSION,
		UseMessageDatabase:  true,
		UseFileDatabase:     true,
		UseChatInfoDatabase: true,
		UseTestDataCenter:   false,
		DatabaseDirectory:   c.Config.TDLib.DatabaseDirectory,
		FileDirectory:       c.Config.TDLib.FilesDirectory,
		IgnoreFileNames:     false,
	})

	for {
		currentState, _ := client.Authorize()
		log.Info().Msg("Starting Telegram authorization...")
		if currentState.GetAuthorizationStateEnum() == tdlib.AuthorizationStateWaitPhoneNumberType {
			fmt.Print("Enter phone: ")
			var number string
			fmt.Scanln(&number)
			_, err := client.SendPhoneNumber(number)
			if err != nil {
				log.Error().Err(err).Msg("Error sending phone number")
			}
		} else if currentState.GetAuthorizationStateEnum() == tdlib.AuthorizationStateWaitCodeType {
			fmt.Print("Enter code: ")
			var code string
			fmt.Scanln(&code)
			_, err := client.SendAuthCode(code)
			if err != nil {
				log.Error().Err(err).Msg("Error sending auth code")
			}
		} else if currentState.GetAuthorizationStateEnum() == tdlib.AuthorizationStateWaitPasswordType {
			fmt.Print("Enter Password: ")
			var password string
			fmt.Scanln(&password)
			_, err := client.SendAuthPassword(password)
			if err != nil {
				log.Error().Err(err).Msg("Error sending auth password")
			}
		} else if currentState.GetAuthorizationStateEnum() == tdlib.AuthorizationStateReadyType {
			me, _ := client.GetMe()
			log.Info().Msgf("Logged into Telegram as @%s", me.Username)
			break
		}
	}
}

// Connect connects into updates chain
func Connect() {
	go func() {
		announcesv1.ZookeeperReceiver(client)
	}()
	rawUpdates := client.GetRawUpdatesChannel(100)
	log.Debug().Msg("Connection with Telegram established")
	for update := range rawUpdates {
		log.Debug().Msgf("Update of type %s received", update.Data["@type"])
	}
}

// Shutdown disconnects from Telegram
func Shutdown() {
	client.DestroyInstance()
	log.Info().Msg("Connection with Telegram closed")
}