package main

import (
	"errors"
	"fmt"
	tgbot "github.com/go-telegram-bot-api/telegram-bot-api"
	"github.com/umputun/go-flags"
	"io/ioutil"
	"log"
	"net/http"
	"os"
	"strconv"
	"strings"
	"valera/commands"
	"valera/db"
)

var (
	workoutTypes = []string{
		"Отжимания",
		"Пресс",
	}
)

const (
	version = "v1.4.0"
)

type Opts struct {
	Token string `short:"t" long:"token" description:"Telegram api token"`
	Name  string `short:"n" long:"name" description:"Telegram bot name" default:"@body_weight_loss_bot"`
}

var opts Opts

func readFile(filename string) (string, error) {
	b, err := ioutil.ReadFile(filename)
	if err != nil {
		return "", err
	}
	str := string(b)
	return str, nil
}

func main() {
	run()
}

func run() {
	p := flags.NewParser(&opts, flags.PrintErrors|flags.PassDoubleDash|flags.HelpFlag)
	p.SubcommandsOptional = true
	if _, err := p.Parse(); err != nil {
		if err.(*flags.Error).Type != flags.ErrHelp {
			log.Println(errors.New("[ERROR] cli error: " + err.Error()))
		}
		os.Exit(2)
	}

	if opts.Token == "" {
		token, err := readFile("token.txt")
		if err != nil {
			panic(err)
		}
		opts.Token = strings.ReplaceAll(token, "\n", "")
	}
	fmt.Println(opts.Token)

	bot, err := tgbot.NewBotAPI(opts.Token)
	if err != nil {
		panic(err)
	}

	mongoURL, err := readFile("mongo_url.txt")
	if err != nil {
		panic(err)
	}
	mongoURL = strings.ReplaceAll(mongoURL, "\n", "")
	fmt.Println(mongoURL)

	dbName, err := readFile("db_name.txt")
	if err != nil {
		panic(err)
	}
	dbName = strings.ReplaceAll(dbName, "\n", "")
	fmt.Println(dbName)

	dataBase := db.NewDB(
		mongoURL,
		dbName,
	)

	u := tgbot.NewUpdate(0)
	u.Timeout = 60

	updates, err := bot.GetUpdatesChan(u)
	if err != nil {
		panic(err)
	}

	go func() {
		http.HandleFunc("/go", func(w http.ResponseWriter, r *http.Request) {
			chats, err := dataBase.GetAllChats()
			if err != nil {
				w.Header().Add("Content-Type", "application/json")
				w.WriteHeader(http.StatusInternalServerError)
				_, _ = fmt.Fprintf(w, `{"result":"error"}`)
				return
			}
			for _, chatID := range chats {
				sendGoToChat(bot, dataBase, chatID)
			}
			w.Header().Add("Content-Type", "application/json")
			w.WriteHeader(http.StatusOK)
			_, _ = fmt.Fprintf(w, `{"result":"ok"}`)
		})

		http.HandleFunc("/stat", func(w http.ResponseWriter, r *http.Request) {
			chats, err := dataBase.GetAllChats()
			if err != nil {
				fmt.Println(err)
				w.Header().Add("Content-Type", "application/json")
				w.WriteHeader(http.StatusInternalServerError)
				_, _ = fmt.Fprintf(w, `{"result":"error"}`)
				return
			}
			for _, chatID := range chats {
				if err := sendStatToChat(bot, dataBase, chatID, "Напоминаю:\n- Cегодня больше не жрем!\n\n"); err != nil {
					fmt.Println(err)
					w.Header().Add("Content-Type", "application/json")
					w.WriteHeader(http.StatusInternalServerError)
					_, _ = fmt.Fprintf(w, `{"result":"error"}`)
					return
				}
			}
			w.Header().Add("Content-Type", "application/json")
			w.WriteHeader(http.StatusOK)
			_, _ = fmt.Fprintf(w, `{"result":"ok"}`)
		})

		port := ":10002"
		log.Println("Server is start up! port", port)
		log.Fatal(http.ListenAndServe(port, nil))
	}()

	log.Println("Run", opts.Name)

	for update := range updates {

		if update.Message == nil {
			continue
		}

		text := update.Message.Text
		chatID := update.Message.Chat.ID
		username := update.Message.From.UserName

		userInfoDTO, err := dataBase.GetChatInfo(chatID)
		if err != nil {
			log.Println(err)
			continue
		}

		isWorkout := false
		for _, workoutType := range workoutTypes {
			if userInfoDTO.GetStatus() == db.UserState(workoutType) {
				count, err := strconv.Atoi(text)
				if err != nil {
					log.Println(err)
					continue
				}
				if err := dataBase.AddWorkout(chatID, db.NewWorkout(workoutType, count, username)); err != nil {
					log.Println(err)
					continue
				}
				msgText := fmt.Sprintf("Отлично, %s, записал.", text)
				if count <= 0 {
					msgText = "Плохо, хочешь быть толстым и не красивым?"
				}
				_, _ = bot.Send(tgbot.NewMessage(chatID, msgText))
				if err := dataBase.SetStatusToChat(chatID, db.UserStateNone); err != nil {
					log.Println(err)
				}
				isWorkout = true
				break
			}
		}
		if isWorkout {
			continue
		}

		switch userInfoDTO.GetStatus() {
		case db.UserStateGo:
			if err := dataBase.SetStatusToChat(chatID, db.UserState(text)); err != nil {
				log.Println(err)
			}
			msg := tgbot.NewMessage(chatID, fmt.Sprintf("%s, отпишись сколько раз ты выполнил упражнение", text))
			msg.ReplyMarkup = tgbot.NewRemoveKeyboard(false)
			_, _ = bot.Send(msg)
			continue
		case db.UserStateEat:
			count, err := strconv.Atoi(text)
			if err != nil {
				log.Println(err)
				continue
			}
			if err := dataBase.AddCalories(chatID, db.NewCalories(count, username)); err != nil {
				log.Println(err)
				continue
			}
			if count <= 0 {
				_, _ = bot.Send(tgbot.NewMessage(chatID, "Все фигня, давай по новой"))
				continue
			}
			_, _ = bot.Send(tgbot.NewMessage(chatID, fmt.Sprintf("Калории, фу, %s, записал.", text)))
			if err := dataBase.SetStatusToChat(chatID, db.UserStateNone); err != nil {
				log.Println(err)
			}
			continue
		}

		command := commands.Command(strings.Replace(text, opts.Name, "", 1))
		switch command {
		case commands.Start:
			_, _ = bot.Send(tgbot.NewMessage(chatID, fmt.Sprintf("Здорова, я Валера (%s), твой тренер (%d).", version, chatID)))
			if err := dataBase.SetStatusToChat(chatID, db.UserStateNone); err != nil {
				log.Println(err)
			}
		case commands.Help:
			_, _ = bot.Send(tgbot.NewMessage(chatID, "Вот что я умею:\n\n1) Предлагать размяться\n2) Показывать статистику\n3) Считать калории"))
		case commands.Ping:
			_, _ = bot.Send(tgbot.NewMessage(chatID, "pong"))
		case commands.Go:
			sendGoToChat(bot, dataBase, chatID)
		case commands.Stat:
			if err := sendStatToChat(bot, dataBase, chatID, ""); err != nil {
				fmt.Println(err)
				continue
			}
		case commands.Eat:
			if _, err := bot.Send(tgbot.NewMessage(chatID, "Вижу ты поел, отпишись сколько калорий было")); err == nil {
				if err := dataBase.SetStatusToChat(chatID, db.UserStateEat); err != nil {
					log.Println(err)
				}
			}
		}
	}
}

func sendGoToChat(bot *tgbot.BotAPI, dataBase *db.DB, chatID int64) {
	msg := tgbot.NewMessage(chatID, "Давай немного разомнемся, выбирай:")
	row := tgbot.NewKeyboardButtonRow()
	for _, workoutType := range workoutTypes {
		row = append(row, tgbot.NewKeyboardButton(workoutType))
	}
	msg.ReplyMarkup = tgbot.NewReplyKeyboard(row)
	if _, err := bot.Send(msg); err == nil {
		if err := dataBase.SetStatusToChat(chatID, db.UserStateGo); err != nil {
			log.Println(err)
		}
	}
}

func sendStatToChat(bot *tgbot.BotAPI, dataBase *db.DB, chatID int64, prefix string) error {
	stat, err := dataBase.GetStat(chatID)
	if err != nil {
		return err
	}
	msgText := prefix + "Результаты за сегодня:\n"
	for k, v := range stat {
		msgText += fmt.Sprintf("- %s: %d\n", k, v)
	}
	_, _ = bot.Send(tgbot.NewMessage(chatID, msgText))
	return nil
}