package main

import (
	"html/template"
	"log"

	tgbotapi "github.com/go-telegram-bot-api/telegram-bot-api/v5"
)

type TelegramBot interface {
	Send(c tgbotapi.Chattable) (tgbotapi.Message, error)
	GetUpdatesChan(u tgbotapi.UpdateConfig) tgbotapi.UpdatesChannel
	StopReceivingUpdates()
}

type EmptyBot struct{}

func (_ EmptyBot) Send(_ tgbotapi.Chattable) (tgbotapi.Message, error) {
	return tgbotapi.Message{}, nil
}

func (_ EmptyBot) GetUpdatesChan(u tgbotapi.UpdateConfig) tgbotapi.UpdatesChannel {
	ch := make(chan tgbotapi.Update)
	close(ch)
	return ch
}

func (_ EmptyBot) StopReceivingUpdates() {}

type TgSender struct {
	bot     TelegramBot
	s       SatelNameGetter
	logger  *log.Logger
	chatIds []int64
}

func (self TgSender) Send(msg GenericMessage, tpl *template.Template) error {
	if len(self.chatIds) == 0 {
		return nil
	}
	message := msg.Format(tpl, self.s, self.logger)
	for _, chatId := range self.chatIds {
		toSend := tgbotapi.NewMessage(chatId, message)
		toSend.ParseMode = "HTML"
		_, err := self.bot.Send(toSend)
		if err != nil {
			return err
		}
	}
	return nil
}