package main

import (
	"crypto/sha1"
	"fmt"
	"net/http"
	"strings"

	"github.com/PuerkitoBio/goquery"
)

func getLimeTorrentsDownloadUrl(url string) (string, error) {
	resp, err := http.Get(url)
	if err != nil {
		return "", fmt.Errorf("couldn't fetch html: %v", err)
	}
	defer resp.Body.Close()

	doc, err := goquery.NewDocumentFromReader(resp.Body)
	if err != nil {
		return "", fmt.Errorf("couldn't create document from response: %v", err)
	}

	href := ""
	doc.Find("a.csprite_dltorrent").Each(func(i int, s *goquery.Selection) {
		h, hasHref := s.Attr("href")
		if !hasHref {
			return
		}

		if strings.HasPrefix(h, "https://") {
			href = h
		}
	})

	if href == "" {
		return "", fmt.Errorf("couldn't find download url")
	}

	return href, nil
}

func toSha1(b []byte) string {
	hash := sha1.New()
	hash.Write(b)
	return fmt.Sprintf("%x", hash.Sum(nil))
}