package lib

import (
	"fmt"
	"net/http"
	"net/url"
	"strconv"
	"strings"

	strux "tea.chunkbyte.com/kato/grabrr/lib/strux"

	"github.com/PuerkitoBio/goquery"
)

func GetBunkrAlbum() {

}

func FetchAlbumInfo(rawURL string) (*strux.Album, error) {
	resp, err := http.Get(rawURL)
	if err != nil {
		return nil, fmt.Errorf("failed to fetch page: %w", err)
	}
	defer resp.Body.Close()

	if resp.StatusCode != 200 {
		return nil, fmt.Errorf("non-200 response: %d", resp.StatusCode)
	}

	doc, err := goquery.NewDocumentFromReader(resp.Body)
	if err != nil {
		return nil, fmt.Errorf("failed to parse HTML: %w", err)
	}

	var album *strux.Album = &strux.Album{}
	fmt.Println(rawURL)
	album.URL, err = url.Parse(rawURL)
	if err != nil {
		return nil, fmt.Errorf("failed to parse URL: %w", err)
	}

	// Title
	album.Title = strings.TrimSpace(doc.Find("h1.truncate").First().Text())

	// Files
	doc.Find(".grid-images .theItem").Each(func(i int, s *goquery.Selection) {
		linkTag := s.Find("a")
		href, exists := linkTag.Attr("href")
		if !exists {
			return
		}

		fileTitle := "No name"
		var fileSize int64 = 0

		if theTitleEl := s.Find(".theName"); theTitleEl != nil {
			fileTitle = strings.TrimSpace(theTitleEl.Text())
		}

		if theSizeEl := s.Find(".theSize"); theSizeEl != nil {
			fileSize, err = ParseSizeToKB(theSizeEl.Text())
		}

		if href[0] == '/' {
			href = fmt.Sprintf("%s://%s%s", album.URL.Scheme, album.URL.Hostname(), href)
		}

		fileURL, _ := url.Parse(href)

		file := strux.File{
			Title:    fileTitle,
			URL:      fileURL,
			Filename: fileTitle,
			SizeKB:   fileSize,
			Format:   fileURL.Path[strings.LastIndex(fileURL.Path, ".")+1:],
		}

		album.Files = append(album.Files, file)
	})

	return album, nil
}

func ParseSizeToKB(sizeStr string) (int64, error) {
	s := strings.TrimSpace(strings.ToLower(sizeStr))

	var multiplier float64
	switch {
	case strings.HasSuffix(s, "gb"):
		multiplier = 1024 * 1024
		s = strings.TrimSuffix(s, "gb")
	case strings.HasSuffix(s, "mb"):
		multiplier = 1024
		s = strings.TrimSuffix(s, "mb")
	case strings.HasSuffix(s, "kb"):
		multiplier = 1
		s = strings.TrimSuffix(s, "kb")
	default:
		return 0, fmt.Errorf("unrecognized unit in %q", sizeStr)
	}

	s = strings.TrimSpace(s)
	value, err := strconv.ParseFloat(s, 64)
	if err != nil {
		return 0, fmt.Errorf("invalid number %q: %w", s, err)
	}

	return int64(value * multiplier), nil
}