class MangaDex {
    constructor(fetchPath, cheerioPath, browser) {
        this.fetchPath = fetchPath;
        this.browser = browser;
        this.baseUrl = "https://mangadex.org";
        this.apiUrl = "https://api.mangadex.org";
        this.type = "book-board"; 
    }

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

    async _fetch(url, options = {}) {
        if (typeof fetch === 'function') {
            return fetch(url, options);
        }
        const nodeFetch = require(this.fetchPath);
        return nodeFetch(url, options);
    }

    async fetchSearchResult(query = "", page = 1) {
        const limit = 25;
        const offset = (page - 1) * limit;
        
        let url;
        if (!query || query.trim() === "") {
            url = `${this.apiUrl}/manga?limit=${limit}&offset=${offset}&includes[]=cover_art&contentRating[]=safe&contentRating[]=suggestive&availableTranslatedLanguage[]=en&order[followedCount]=desc`;
        } else {
            url = `${this.apiUrl}/manga?title=${encodeURIComponent(query)}&limit=${limit}&offset=${offset}&includes[]=cover_art&contentRating[]=safe&contentRating[]=suggestive&availableTranslatedLanguage[]=en`;
        }

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

            const json = await response.json();
            if (!json || !Array.isArray(json.data)) {
                return { results: [], hasNextPage: false, page };
            }

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

                const tags = attributes.tags 
                    ? attributes.tags.map(t => t.attributes.name.en) 
                    : [];

                return {
                    id: manga.id,
                    image: coverUrl,
                    sampleImageUrl: fullCoverUrl, 
                    title: title,
                    tags: tags,
                    type: 'book'
                };
            });

            const total = json.total || 0;
            const hasNextPage = (offset + limit) < total;

            return {
                results,
                hasNextPage,
                page
            };

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

    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 this._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}`,
                            chapter: 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));
                }
            }

            let highResCover = null;
            try {
                const mangaRes = await this._fetch(`${this.apiUrl}/manga/${mangaId}?includes[]=cover_art`);
                if (mangaRes.ok) {
                    const mangaJson = await mangaRes.json();
                    const coverRel = mangaJson.data.relationships.find(r => r.type === 'cover_art');
                    if(coverRel && coverRel.attributes && coverRel.attributes.fileName) {
                        highResCover = `https://uploads.mangadex.org/covers/${mangaId}/${coverRel.attributes.fileName}`;
                    }
                }
            } catch(e) {  }

            return {
                chapters: chapters,
                cover: highResCover
            };

        } 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 this._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 };