// Package zmanga implements the ZManga base.
// GET {base}/advanced-search/page/{n}/?order=popular; FlareSolverr required.
package zmanga

import (
	"context"
	"fmt"
	"net/http"
	"strings"

	"github.com/PuerkitoBio/goquery"

	"goyomi/internal/httpclient/flare"
	"goyomi/internal/source"
	"goyomi/sources/base/util"
)

type Config struct {
	Name    string
	BaseURL string
	Lang    string
}

type Source struct {
	cfg    Config
	client *flare.Client
	id     int64
}

func New(cfg Config) *Source {
	opts := []flare.Option{flare.WithRateLimit(1, 2)}
	c := flare.NewClient(opts...)
	return &Source{cfg: cfg, client: c, id: source.GenerateSourceID(cfg.Name, cfg.Lang)}
}

func (s *Source) ID() int64            { return s.id }
func (s *Source) Name() string         { return s.cfg.Name }
func (s *Source) Lang() string         { return s.cfg.Lang }
func (s *Source) SupportsLatest() bool { return true }

func (s *Source) base() string { return strings.TrimRight(s.cfg.BaseURL, "/") }

func (s *Source) get(ctx context.Context, rawURL string) (*goquery.Document, error) {
	req, err := http.NewRequestWithContext(ctx, http.MethodGet, rawURL, nil)
	if err != nil {
		return nil, err
	}
	req.Header.Set("Referer", s.cfg.BaseURL+"/")
	resp, err := s.client.Do(req)
	if err != nil {
		return nil, err
	}
	defer resp.Body.Close()
	if resp.StatusCode != http.StatusOK {
		return nil, fmt.Errorf("zmanga: HTTP %d", resp.StatusCode)
	}
	return goquery.NewDocumentFromReader(resp.Body)
}

func (s *Source) pageSegment(page int) string {
	if page > 1 {
		return fmt.Sprintf("page/%d/", page)
	}
	return ""
}

func (s *Source) parseMangaList(doc *goquery.Document) source.MangasPage {
	var mangas []source.SManga
	doc.Find("div.flexbox2-item").Each(func(_ int, el *goquery.Selection) {
		m := source.SManga{}
		el.Find("div.flexbox2-content a").First().Each(func(_ int, a *goquery.Selection) {
			m.URL, _ = a.Attr("href")
		})
		el.Find("div.flexbox2-title > span").First().Each(func(_ int, e *goquery.Selection) {
			m.Title = strings.TrimSpace(e.Text())
		})
		m.ThumbnailURL = imgAttr(el.Find("img").First(), s.cfg.BaseURL)
		if m.URL != "" {
			mangas = append(mangas, m)
		}
	})
	hasNext := doc.Find(".pagination .next, .wp-pagenavi a.nextpostslink").Length() > 0
	return source.MangasPage{Mangas: mangas, HasNextPage: hasNext}
}

func (s *Source) GetPopularManga(page int) (source.MangasPage, error) {
	doc, err := s.get(context.Background(), fmt.Sprintf("%s/advanced-search/%s?order=popular", s.base(), s.pageSegment(page)))
	if err != nil {
		return source.MangasPage{}, err
	}
	return s.parseMangaList(doc), nil
}

func (s *Source) GetLatestUpdates(page int) (source.MangasPage, error) {
	doc, err := s.get(context.Background(), fmt.Sprintf("%s/advanced-search/%s?order=update", s.base(), s.pageSegment(page)))
	if err != nil {
		return source.MangasPage{}, err
	}
	return s.parseMangaList(doc), nil
}

func (s *Source) GetSearchManga(page int, query string, filters []source.Filter) (source.MangasPage, error) {
	doc, err := s.get(context.Background(), fmt.Sprintf("%s/advanced-search/%s?s=%s", s.base(), s.pageSegment(page), query))
	if err != nil {
		return source.MangasPage{}, err
	}
	return s.parseMangaList(doc), nil
}

func (s *Source) GetMangaDetails(manga source.SManga) (source.SManga, error) {
	doc, err := s.get(context.Background(), util.AbsURL(s.cfg.BaseURL, manga.URL))
	if err != nil {
		return manga, err
	}
	result := source.SManga{URL: manga.URL}
	result.ThumbnailURL = imgAttr(doc.Find("div.series-thumb img").First(), s.cfg.BaseURL)
	doc.Find(".series-infolist li").Each(func(_ int, el *goquery.Selection) {
		label := strings.ToLower(strings.TrimSpace(el.Find("b, strong").Text()))
		val := strings.TrimSpace(el.Find("span, a").First().Text())
		switch {
		case strings.Contains(label, "author"):
			result.Author = val
		case strings.Contains(label, "artist"):
			result.Artist = val
		}
	})
	doc.Find(".series-infoz .status").First().Each(func(_ int, el *goquery.Selection) {
		result.Status = util.StatusFromString(el.Text())
	})
	result.Description = strings.TrimSpace(doc.Find("div.series-synops").Text())
	var genres []string
	doc.Find("div.series-genres a").Each(func(_ int, el *goquery.Selection) {
		if t := strings.TrimSpace(el.Text()); t != "" {
			genres = append(genres, t)
		}
	})
	result.Genre = strings.Join(genres, ", ")
	if t := strings.TrimSpace(doc.Find(".series-title h1, .series-titlex h1").Text()); t != "" {
		result.Title = t
	} else {
		result.Title = manga.Title
	}
	return result, nil
}

func (s *Source) GetChapterList(manga source.SManga) ([]source.SChapter, error) {
	doc, err := s.get(context.Background(), util.AbsURL(s.cfg.BaseURL, manga.URL))
	if err != nil {
		return nil, err
	}
	var chapters []source.SChapter
	doc.Find("ul.series-chapterlist div.flexch-infoz a").Each(func(_ int, a *goquery.Selection) {
		ch := source.SChapter{Name: strings.TrimSpace(a.Text())}
		ch.URL, _ = a.Attr("href")
		a.Closest("li").Find("span.date, .chapterdate").First().Each(func(_ int, el *goquery.Selection) {
			ch.DateUpload = util.ParseRelativeDate(el.Text())
		})
		if ch.URL != "" {
			chapters = append(chapters, ch)
		}
	})
	return chapters, nil
}

func (s *Source) GetPageList(chapter source.SChapter) ([]source.Page, error) {
	doc, err := s.get(context.Background(), util.AbsURL(s.cfg.BaseURL, chapter.URL))
	if err != nil {
		return nil, err
	}
	var pages []source.Page
	doc.Find("div.reader-area img").Each(func(i int, img *goquery.Selection) {
		if u := imgAttr(img, s.cfg.BaseURL); u != "" {
			pages = append(pages, source.Page{Index: i, ImageURL: u})
		}
	})
	return pages, nil
}

func (s *Source) GetImageURL(page source.Page) (string, error) { return page.ImageURL, nil }
func (s *Source) GetFilterList() []source.Filter               { return nil }

func imgAttr(img *goquery.Selection, baseURL string) string {
	for _, attr := range []string{"data-lazy-src", "data-src", "data-cfsrc", "src"} {
		if v, ok := img.Attr(attr); ok && v != "" && !strings.HasPrefix(v, "data:") {
			return util.AbsURL(baseURL, v)
		}
	}
	return ""
}