// Package lectormoe implements the LectorMoe manga base.
// JSON REST via capibaratraductor.com API; x-organization header required.
package lectormoe

import (
	"context"
	"encoding/json"
	"fmt"
	"io"
	"net/http"
	"strings"

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

const pageLimit = 36

type Config struct {
	Name               string
	BaseURL            string
	Lang               string
	OrganizationDomain string // defaults to last segment of BaseURL
	APIBaseURL         string // defaults to "https://capibaratraductor.com"
}

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

func New(cfg Config) *Source {
	if cfg.APIBaseURL == "" {
		cfg.APIBaseURL = "https://capibaratraductor.com"
	}
	if cfg.OrganizationDomain == "" {
		cfg.OrganizationDomain = util.SlugFromURL(cfg.BaseURL)
	}
	c := flare.NewClient(flare.WithRateLimit(3, 1))
	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) api() string { return strings.TrimRight(s.cfg.APIBaseURL, "/") }

func (s *Source) getJSON(ctx context.Context, rawURL string, out any) error {
	resp, err := s.client.Get(ctx, rawURL)
	if err != nil {
		return err
	}
	defer resp.Body.Close()
	if resp.StatusCode != http.StatusOK {
		return fmt.Errorf("lectormoe: HTTP %d", resp.StatusCode)
	}
	body, _ := io.ReadAll(resp.Body)
	return json.Unmarshal(body, out)
}

type listDTO struct {
	Data []struct {
		Slug        string `json:"slug"`
		Name        string `json:"name"`
		Cover       string `json:"cover"`
		Synopsis    string `json:"synopsis"`
		Author      string `json:"author"`
		Status      string `json:"status"`
		Genres      []struct{ Name string `json:"name"` } `json:"genres"`
		Chapters    []chapterDTO `json:"chapters"`
	} `json:"data"`
	Meta struct {
		Total       int `json:"total"`
		CurrentPage int `json:"current_page"`
		LastPage    int `json:"last_page"`
	} `json:"meta"`
}

type chapterDTO struct {
	Slug       string `json:"slug"`
	SeriesSlug string `json:"series_slug"`
	Name       string `json:"name"`
	Number     float64 `json:"number"`
	PublishedAt string `json:"published_at"`
	IsUnreleased bool `json:"is_unreleased"`
}

func (s *Source) fetchList(ctx context.Context, page int, order, q string) (source.MangasPage, error) {
	u := fmt.Sprintf("%s/api/manga-custom?page=%d&limit=%d&order=%s", s.api(), page, pageLimit, order)
	if q != "" {
		u += "&search=" + q
	}
	var result listDTO
	if err := s.getJSON(ctx, u, &result); err != nil {
		return source.MangasPage{}, err
	}
	mangas := make([]source.SManga, len(result.Data))
	for i, m := range result.Data {
		mangas[i] = source.SManga{
			URL:          m.Slug,
			Title:        m.Name,
			ThumbnailURL: m.Cover,
		}
	}
	hasNext := result.Meta.CurrentPage < result.Meta.LastPage
	return source.MangasPage{Mangas: mangas, HasNextPage: hasNext}, nil
}

func (s *Source) GetPopularManga(page int) (source.MangasPage, error) {
	return s.fetchList(context.Background(), page, "popular", "")
}
func (s *Source) GetLatestUpdates(page int) (source.MangasPage, error) {
	return s.fetchList(context.Background(), page, "latest", "")
}
func (s *Source) GetSearchManga(page int, query string, filters []source.Filter) (source.MangasPage, error) {
	return s.fetchList(context.Background(), page, "popular", query)
}

func (s *Source) GetMangaDetails(manga source.SManga) (source.SManga, error) {
	var result struct {
		Data struct {
			Slug     string `json:"slug"`
			Name     string `json:"name"`
			Cover    string `json:"cover"`
			Synopsis string `json:"synopsis"`
			Author   string `json:"author"`
			Status   string `json:"status"`
			Genres   []struct{ Name string `json:"name"` } `json:"genres"`
		} `json:"data"`
	}
	if err := s.getJSON(context.Background(), fmt.Sprintf("%s/api/manga-custom/%s", s.api(), manga.URL), &result); err != nil {
		return manga, err
	}
	genres := make([]string, len(result.Data.Genres))
	for i, g := range result.Data.Genres {
		genres[i] = g.Name
	}
	return source.SManga{
		URL:          manga.URL,
		Title:        result.Data.Name,
		Author:       result.Data.Author,
		Description:  result.Data.Synopsis,
		Genre:        strings.Join(genres, ", "),
		Status:       util.StatusFromString(result.Data.Status),
		ThumbnailURL: result.Data.Cover,
	}, nil
}

func (s *Source) GetChapterList(manga source.SManga) ([]source.SChapter, error) {
	var result struct {
		Data struct {
			Slug     string       `json:"slug"`
			Chapters []chapterDTO `json:"chapters"`
		} `json:"data"`
	}
	if err := s.getJSON(context.Background(), fmt.Sprintf("%s/api/manga-custom/%s", s.api(), manga.URL), &result); err != nil {
		return nil, err
	}
	var chapters []source.SChapter
	for _, ch := range result.Data.Chapters {
		if ch.IsUnreleased {
			continue
		}
		seriesSlug := ch.SeriesSlug
		if seriesSlug == "" {
			seriesSlug = manga.URL
		}
		name := ch.Name
		if name == "" {
			name = fmt.Sprintf("Chapter %.1f", ch.Number)
		}
		chapters = append(chapters, source.SChapter{
			URL:        seriesSlug + "/" + ch.Slug,
			Name:       name,
			DateUpload: util.ParseAbsoluteDate(ch.PublishedAt, "2006-01-02T15:04:05Z"),
		})
	}
	return chapters, nil
}

func (s *Source) GetPageList(chapter source.SChapter) ([]source.Page, error) {
	seriesSlug := strings.SplitN(chapter.URL, "/", 2)[0]
	chSlug := ""
	if parts := strings.SplitN(chapter.URL, "/", 2); len(parts) == 2 {
		chSlug = parts[1]
	}
	var result struct {
		Data []struct {
			ImageURL string `json:"image_url"`
		} `json:"data"`
	}
	u := fmt.Sprintf("%s/api/manga-custom/%s/chapter/%s/pages", s.api(), seriesSlug, chSlug)
	if err := s.getJSON(context.Background(), u, &result); err != nil {
		return nil, err
	}
	pages := make([]source.Page, len(result.Data))
	for i, p := range result.Data {
		pages[i] = source.Page{Index: i, ImageURL: p.ImageURL}
	}
	return pages, nil
}

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