class MangaDex {
    constructor() {
        this.baseUrl = "https://mangadex.org";
        this.apiUrl = "https://api.mangadex.org";
        this.type = "book-board";
        this.mediaType = "manga";
        this.version = "1.0"
    }

    getHeaders() {
        return {
            'User-Agent': 'MangaDex-Client-Adapter/1.0',
            'Content-Type': 'application/json'
        };
    }

    async search(queryObj) {
        const query = queryObj.query?.trim() || "";
        const limit = 25;
        const offset = (1 - 1) * limit;
        
        const url = `${this.apiUrl}/manga?title=${encodeURIComponent(query)}&limit=${limit}&offset=${offset}&includes[]=cover_art&contentRating[]=safe&contentRating[]=suggestive&availableTranslatedLanguage[]=en`;

        try {
            const response = await fetch(url, { headers: this.getHeaders() });
            if (!response.ok) {
                console.error(`MangaDex API Error: ${response.statusText}`);
                return [];
            }

            const json = await response.json();
            if (!json || !Array.isArray(json.data)) {
                return [];
            }

            return json.data.map(manga => {
                const attributes = manga.attributes;
                const titleObject = attributes.title || {};
                const title = titleObject.en || Object.values(titleObject)[0] || 'Unknown Title';

                const coverRelationship = manga.relationships?.find(rel => rel.type === 'cover_art');
                const coverFileName = coverRelationship?.attributes?.fileName;

                const coverUrl = coverFileName
                    ? `https://uploads.mangadex.org/covers/${manga.id}/${coverFileName}.256.jpg`
                    : '';


                return {
                    id: manga.id,
                    image: coverUrl,
                    title: title,
                    rating: null,
                    type: 'book'
                };
            });

        } catch (e) {
            console.error("Error during MangaDex search:", e);
            return [];
        }
    }

    async getMetadata(id) {
        try {
            const res = await fetch(`https://api.mangadex.org/manga/${id}?includes[]=cover_art`);
            if (!res.ok) throw new Error("MangaDex API error");

            const json = await res.json();
            const manga = json.data;
            const attr = manga.attributes;

            const title =
                attr.title?.en ||
                Object.values(attr.title || {})[0] ||
                "";

            const summary =
                attr.description?.en ||
                Object.values(attr.description || {})[0] ||
                "";

            const genres = manga.relationships
                ?.filter(r => r.type === "tag")
                ?.map(r =>
                    r.attributes?.name?.en ||
                    Object.values(r.attributes?.name || {})[0]
                )
                ?.filter(Boolean) || [];

            const coverRel = manga.relationships.find(r => r.type === "cover_art");
            const coverFile = coverRel?.attributes?.fileName;
            const image = coverFile
                ? `https://uploads.mangadex.org/covers/${id}/${coverFile}.512.jpg`
                : "";

            const score100 = 0;

            const statusMap = {
                ongoing: "Ongoing",
                completed: "Completed",
                hiatus: "Hiatus",
                cancelled: "Cancelled"
            };

            return {
                id,
                title,
                format: "Manga",
                score: score100,
                genres,
                status: statusMap[attr.status] || "",
                published: attr.year ? String(attr.year) : "???",
                summary,
                chapters: attr.lastChapter ? Number(attr.lastChapter) || 0 : 0,
                image
            };

        } catch (e) {
            console.error("MangaDex getMetadata error:", e);
            return {
                id,
                title: "",
                format: "Manga",
                score: 0,
                genres: [],
                status: "",
                published: "???",
                summary: "",
                chapters: 0,
                image: ""
            };
        }
    }

    async findChapters(mangaId) {
        if (!mangaId) return [];

        const url = `${this.apiUrl}/manga/${mangaId}/feed?translatedLanguage[]=en&order[chapter]=asc&limit=500&includes[]=scanlation_group`;

        try {
            const response = await fetch(url, { headers: this.getHeaders() });
            let chapters = [];
            
            if (response.ok) {
                const json = await response.json();
                if (json && Array.isArray(json.data)) {
                    const allChapters = json.data
                        .filter(ch => ch.attributes.chapter && !ch.attributes.externalUrl)
                        .map((ch, index) => ({
                            id: ch.id,
                            title: ch.attributes.title || `Chapter ${ch.attributes.chapter}`,
                            number: ch.attributes.chapter,
                            index: index,
                            language: ch.attributes.translatedLanguage
                        }));
                    
                    const seenChapters = new Set();
                    allChapters.forEach(ch => {
                        if (!seenChapters.has(ch.chapter)) {
                            seenChapters.add(ch.chapter);
                            chapters.push(ch);
                        }
                    });

                    chapters.sort((a, b) => parseFloat(a.chapter) - parseFloat(b.chapter));
                }
            }

            return chapters;
        } catch (e) {
            console.error("Error finding MangaDex chapters:", e);
            return { chapters: [], cover: null };
        }
    }


    async findChapterPages(chapterId) {
        if (!chapterId) return [];
        const url = `${this.apiUrl}/at-home/server/${chapterId}`;

        try {
            const response = await fetch(url, { headers: this.getHeaders() });
            if (!response.ok) throw new Error(`Failed to fetch pages: ${response.statusText}`);

            const json = await response.json();
            if (!json || !json.baseUrl || !json.chapter) return [];

            const baseUrl = json.baseUrl;
            const chapterHash = json.chapter.hash;
            const imageFilenames = json.chapter.data; 

            return imageFilenames.map((filename, index) => ({
                url: `${baseUrl}/data/${chapterHash}/${filename}`,
                index: index,
                headers: {
                    'Referer': `https://mangadex.org/chapter/${chapterId}`
                }
            }));
        } catch (e) {
            console.error("Error finding MangaDex pages:", e);
            return [];
        }
    }
}

module.exports = MangaDex;