package main

import (
	"crypto/tls"
	"fmt"
	"math/rand"
	"net/http"
	"os"
	"strings"
	"time"

	"git.fromouter.space/mcg/draftbot"

	"git.fromouter.space/hamcha/tg"
	"github.com/go-kit/kit/log"
	"github.com/spf13/viper"
)

func checkErr(err error, msg string, args ...interface{}) {
	if err != nil {
		fmt.Printf("FATAL ERROR\n"+msg+":\n  ", args...)
		fmt.Println(err.Error())
		os.Exit(1)
	}
}

var api *tg.Telegram
var botname string
var tgapi *tgInterface
var logger log.Logger

func main() {
	viper.AutomaticEnv()

	bind := viper.GetString("bind")
	if bind == "" {
		panic("Missing BIND")
	}

	token := viper.GetString("token")
	if token == "" {
		panic("Missing TOKEN")
	}

	webhookURL := viper.GetString("webhookurl")
	if webhookURL == "" {
		panic("Missing WEBHOOKURL")
	}

	webhookPath := viper.GetString("webhookpath")
	if webhookURL == "" {
		panic("Missing WEBHOOKPATH")
	}

	botname = viper.GetString("botname")
	if botname == "" {
		panic("Missing BOTNAME")
	}

	initTemplates()

	// Seed RNG
	rand.Seed(time.Now().UnixNano())

	logger = log.NewLogfmtLogger(os.Stderr)
	logger = log.With(logger, "ts", log.DefaultTimestampUTC)
	logger = log.With(logger, "caller", log.DefaultCaller)

	// Ignore CA errors
	http.DefaultTransport.(*http.Transport).TLSClientConfig = &tls.Config{InsecureSkipVerify: true}

	api = tg.MakeAPIClient(token)
	api.SetWebhook(webhookURL)
	tgapi = &tgInterface{
		client:   api,
		usermap:  make(map[string]*draftUser),
		sessions: make(map[int64]*draftSession),
	}
	bot := draftbot.NewDraftBot(tgapi, botname)
	bot.Logger = logger
	tgapi.Bind(bot)
	logger.Log("err", api.HandleWebhook(bind, webhookPath, webhook))
}

func webhook(update tg.APIUpdate) {
	if update.Message != nil {
		msg := *update.Message
		if msg.Chat == nil {
			return
		}
		tgapi.OnMessage(msg)
		return
	}
}

func isCommand(update tg.APIMessage, cmdname string) bool {
	if update.Text == nil {
		return false
	}

	text := strings.TrimSpace(*(update.Text))

	shortcmd := "/" + cmdname
	fullcmd := shortcmd + "@" + botname

	// Check short form
	if text == shortcmd || strings.HasPrefix(text, shortcmd+" ") {
		return true
	}

	// Check long form
	if text == fullcmd || strings.HasPrefix(text, fullcmd+" ") {
		return true
	}

	return false
}