package main

import (
	"fmt"
	"log"
	"net/http"
	"net/url"

	"github.com/dustin/go-humanize"
	"github.com/joho/godotenv"
	"github.com/namsral/flag"
)

var (
	ChatId   int
	BotToken string
)

func init() {
	err := godotenv.Load()
	if err != nil {
		log.Fatal("error loading .env file")
	}
	flag.IntVar(&ChatId, "TELEGRAM_CHAT_ID", 0, "Chat id of telegram channel")
	flag.StringVar(&BotToken, "TELEGRAM_BOT_TOKEN", "", "Telegram bot token")
	flag.Parse()
	if ChatId == 0 {
		log.Fatal("TELEGRAM_CHAT_ID not set")
	}
	if BotToken == "" {
		log.Fatal("TELEGRAM_BOT_TOKEN not set")
	}
}

func SendItemToTelegram(item *Item) error {
	text := fmt.Sprintf("%s (%s)\n", item.Title, humanize.Time(item.PubDate.Time))
	linkItem := item.Link != item.Guid
	if linkItem {
		text += fmt.Sprintf("[Link](%s) ", item.Link)
	}
	text += fmt.Sprintf("[Comments](%s)", item.Guid)
	return SendTextToTelegram(text)
}

func SendTextToTelegram(text string) error {
	url := fmt.Sprintf("https://api.telegram.org/bot%s/sendMessage?parse_mode=markdown&disable_web_page_preview=true&chat_id=%d&text=%s", BotToken, ChatId, url.QueryEscape(text))
	resp, err := http.Get(url)
	if err != nil {
		err = fmt.Errorf("error during GET %s: %w", url, err)
		return err
	}
	defer resp.Body.Close()
	log.Printf("GET %s: %d\n", url, resp.StatusCode)
	return nil
}