package stat_bot_state

import (
	"fmt"
	"net/http"
	"time"
	"valera/internal/db"
	"valera/internal/states"

	tgbot "github.com/go-telegram-bot-api/telegram-bot-api"
	"golang.org/x/exp/slices"
)

var names = []string{
	"/stat",
	"/stat_week",
}

type statBotState struct {
	bot      *tgbot.BotAPI
	dataBase *db.DB
}

func NewStatBotState(bot *tgbot.BotAPI, dataBase *db.DB) states.BotState {
	return &statBotState{
		bot:      bot,
		dataBase: dataBase,
	}
}

func (s *statBotState) Do(text string, chatInfo *db.ChatInfo) error {
	if !slices.Contains(names, text) {
		return nil
	}

	if text == "/stat" {
		s.sendStatToChatAfter(chatInfo.ChatID, "Результаты за сегодня:\n", s.getStartDay())
	}

	if text == "/stat_week" {
		s.sendStatToChatAfter(chatInfo.ChatID, "Результаты за неделю:\n", s.getStartWeek())
	}

	return nil
}

func (s *statBotState) GetHandler() (string, func(http.ResponseWriter, *http.Request)) {
	return names[0], func(w http.ResponseWriter, r *http.Request) {
		chats, err := s.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 {
			t := s.getStartDay()
			if err := s.sendStatToChatAfter(chatID, "Напоминаю:\n- Cегодня больше не жрем!\n\nРезультаты за сегодня:\n", s.getStartDay()); err != nil {
				w.Header().Add("Content-Type", "application/json")
				w.WriteHeader(http.StatusInternalServerError)
				_, _ = fmt.Fprintf(w, `{"result":"error"}`)
				return
			}
			if t.Weekday() == time.Sunday {
				if err := s.sendStatToChatAfter(chatID, "Результаты за неделю:\n", s.getStartWeek()); err != nil {
					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"}`)
	}
}

func (s *statBotState) sendStatToChatAfter(chatID int64, prefix string, t time.Time) error {
	msgText := prefix
	stat, err := s.dataBase.GetStatAfter(chatID, t)
	if err != nil {
		return err
	}
	for k, v := range stat {
		msgText += fmt.Sprintf("- %s: %d\n", k, v)
	}
	_, _ = s.bot.Send(tgbot.NewMessage(chatID, msgText))
	return nil
}

func (s *statBotState) getStartDay() time.Time {
	loc, _ := time.LoadLocation("Asia/Novosibirsk")
	t := time.Now().In(loc)
	t = time.Date(t.Year(), t.Month(), t.Day(), 0, 0, 0, 0, loc)
	return t
}

func (s *statBotState) getStartWeek() time.Time {
	t := s.getStartDay()
	t = t.Add(-6 * 24 * time.Hour)
	return t
}