package notify

import (
	"context"
	"log"
	"net"
	"net/http"
	"time"

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

type Bot struct {
	api *tgbotapi.BotAPI
}

func NewTelegram(token string, disableIPV6 bool) (*Bot, error) {
	dialer := &net.Dialer{
		Timeout:   30 * time.Second,
		KeepAlive: 30 * time.Second,
	}

	transport := &http.Transport{
		// Заменяем стандартный DialContext
		DialContext: func(ctx context.Context, network, addr string) (net.Conn, error) {
			// "tcp4" отключает IPv6
			return dialer.DialContext(ctx, "tcp4", addr)
		},
		TLSHandshakeTimeout: 10 * time.Second,
	}

	client := &http.Client{
		Transport: transport,
		Timeout:   60 * time.Second,
	}

	if disableIPV6 {
		client.Transport = &http.Transport{
			// Заменяем стандартный DialContext
			DialContext: func(ctx context.Context, network, addr string) (net.Conn, error) {
				// "tcp4" отключает IPv6
				return dialer.DialContext(ctx, "tcp4", addr)
			},
			TLSHandshakeTimeout: 10 * time.Second,
		}
	}

	botApi, err := tgbotapi.NewBotAPIWithClient(token, tgbotapi.APIEndpoint, client)
	if err != nil {
		log.Fatalf("Telegram bot api error: %v", err)
	}
	bot := &Bot{
		api: botApi,
	}
	return bot, nil
}

func (s *Bot) SendTextMessage(chatID int64, text string) (tgbotapi.Message, error) {
	message := tgbotapi.NewMessage(chatID, text)
	message.ParseMode = "Markdown"
	return s.api.Send(message)
}