// Package fuzzydoodle implements the FuzzyDoodle manga base.
// https://github.com/jhin1m/fuzzy-doodle — HTML scraping, CF-protected.
package fuzzydoodle

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 {
	c := flare.NewClient(flare.WithRateLimit(1, 2))
	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("fuzzydoodle: HTTP %d", resp.StatusCode)
	}
	return goquery.NewDocumentFromReader(resp.Body)
}

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)
		}
	}
	// srcset: take first entry
	if v, ok := img.Attr("srcset"); ok && v != "" {
		return util.AbsURL(baseURL, strings.Fields(v)[0])
	}
	return ""
}

func mangaFromElement(el *goquery.Selection, baseURL string) source.SManga {
	m := source.SManga{}
	el.Find("a").First().Each(func(_ int, a *goquery.Selection) {
		m.URL, _ = a.Attr("href")
	})
	m.Title = strings.TrimSpace(el.Find("h2.text-sm").Text())
	if m.Title == "" {
		m.Title = strings.TrimSpace(el.Find("h2, h3").First().Text())
	}
	el.Find("img").First().Each(func(_ int, img *goquery.Selection) {
		m.ThumbnailURL = imgAttr(img, baseURL)
	})
	return m
}

func hasNextPage(doc *goquery.Document) bool {
	return doc.Find("ul.pagination > li:last-child:not(.pagination-disabled)").Length() > 0
}

func (s *Source) parsePage(doc *goquery.Document) source.MangasPage {
	var mangas []source.SManga
	doc.Find("div#card-real").Each(func(_ int, el *goquery.Selection) {
		m := mangaFromElement(el, s.cfg.BaseURL)
		if m.URL != "" {
			mangas = append(mangas, m)
		}
	})
	return source.MangasPage{Mangas: mangas, HasNextPage: hasNextPage(doc)}
}

func (s *Source) GetPopularManga(page int) (source.MangasPage, error) {
	u := fmt.Sprintf("%s/manga?page=%d", s.base(), page)
	doc, err := s.get(context.Background(), u)
	if err != nil {
		return source.MangasPage{}, err
	}
	return s.parsePage(doc), nil
}

func (s *Source) GetLatestUpdates(page int) (source.MangasPage, error) {
	u := fmt.Sprintf("%s/latest?page=%d", s.base(), page)
	doc, err := s.get(context.Background(), u)
	if err != nil {
		return source.MangasPage{}, err
	}
	return s.parsePage(doc), nil
}

func (s *Source) GetSearchManga(page int, query string, filters []source.Filter) (source.MangasPage, error) {
	u := fmt.Sprintf("%s/manga?title=%s&page=%d", s.base(), query, page)
	doc, err := s.get(context.Background(), u)
	if err != nil {
		return source.MangasPage{}, err
	}
	return s.parsePage(doc), nil
}

func getInfo(doc *goquery.Selection, label string) string {
	// p:has(span:containsOwn({label})) span.capitalize
	var result string
	doc.Find("p").Each(func(_ int, p *goquery.Selection) {
		if strings.Contains(p.Find("span").First().Text(), label) {
			result = strings.TrimSpace(p.Find("span.capitalize").Text())
		}
	})
	return result
}

func parseStatus(s string) int {
	switch strings.ToLower(strings.TrimSpace(s)) {
	case "ongoing", "en cours":
		return source.StatusOngoing
	case "completed", "completed (season)", "terminé":
		return source.StatusCompleted
	case "hiatus", "on hiatus":
		return source.StatusHiatus
	default:
		return source.StatusUnknown
	}
}

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.Title = strings.TrimSpace(doc.Find("h1").First().Text())
	if result.Title == "" {
		result.Title = manga.Title
	}
	result.ThumbnailURL = imgAttr(doc.Find("div.relative img").First(), s.cfg.BaseURL)

	var genres []string
	doc.Find("div.flex > a.inline-block").Each(func(_ int, el *goquery.Selection) {
		if t := strings.TrimSpace(el.Text()); t != "" {
			genres = append(genres, t)
		}
	})

	// description
	var descParts []string
	doc.Find("div:has(> p#description)").First().Each(func(_ int, el *goquery.Selection) {
		descParts = append(descParts, strings.TrimSpace(el.Text()))
	})
	result.Description = strings.Join(descParts, "\n\n")

	if t := getInfo(doc.Selection, "Status"); t != "" || getInfo(doc.Selection, "Statut") != "" {
		st := t
		if st == "" {
			st = getInfo(doc.Selection, "Statut")
		}
		result.Status = parseStatus(st)
	}
	if a := getInfo(doc.Selection, "Artist"); a != "" {
		result.Artist = a
	} else if a := getInfo(doc.Selection, "Artiste"); a != "" {
		result.Artist = a
	}
	if a := getInfo(doc.Selection, "Author"); a != "" {
		result.Author = a
	} else if a := getInfo(doc.Selection, "Auteur"); a != "" {
		result.Author = a
	}
	if t := getInfo(doc.Selection, "Type"); t != "" {
		genres = append([]string{t}, genres...)
	}
	result.Genre = strings.Join(genres, ", ")
	return result, nil
}

func (s *Source) GetChapterList(manga source.SManga) ([]source.SChapter, error) {
	mangaURL := util.AbsURL(s.cfg.BaseURL, manga.URL)
	var chapters []source.SChapter
	page := 1
	for {
		u := mangaURL
		if page > 1 {
			u = fmt.Sprintf("%s?page=%d", mangaURL, page)
		}
		doc, err := s.get(context.Background(), u)
		if err != nil {
			if page == 1 {
				return nil, err
			}
			break
		}
		doc.Find("div#chapters-list > a[href]").Each(func(_ int, a *goquery.Selection) {
			ch := source.SChapter{}
			ch.URL, _ = a.Attr("href")
			ch.Name = strings.TrimSpace(a.Find("#item-title, span").First().Text())
			if ch.Name == "" {
				ch.Name = strings.TrimSpace(a.Text())
			}
			// date
			a.Find("p, span").Each(func(_ int, el *goquery.Selection) {
				if t := strings.TrimSpace(el.Text()); t != "" && ch.DateUpload == 0 {
					ch.DateUpload = util.ParseRelativeDate(t)
				}
			})
			if ch.URL != "" {
				chapters = append(chapters, ch)
			}
		})
		if doc.Find("ul.pagination > li:last-child:not(.pagination-disabled)").Length() == 0 {
			break
		}
		page++
	}
	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#chapter-container > 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 }