const fastify = require('fastify')({ logger: true });
const path = require('path');
const fs = require('fs');
const os = require('os');
const { animeMetadata } = require('./src/metadata/anilist');
const sqlite3 = require('sqlite3').verbose();

// --- DATABASE CONNECTION ---
const DB_PATH = path.join(__dirname, 'src', 'metadata', 'anilist_anime.db');
const db = new sqlite3.Database(DB_PATH, sqlite3.OPEN_READONLY, (err) => {
    if (err) console.error("Database Error:", err.message);
    else console.log("Connected to local AniList database.");
});

// --- EXTENSION LOADER ---
const extensions = new Map();

async function loadExtensions() {
    const homeDir = os.homedir();
    const extensionsDir = path.join(homeDir, 'WaifuBoards', 'extensions');

    if (!fs.existsSync(extensionsDir)) {
        return;
    }

    try {
        const files = await fs.promises.readdir(extensionsDir);
        for (const file of files) {
            if (file.endsWith('.js')) {
                const filePath = path.join(extensionsDir, file);
                try {
                    delete require.cache[require.resolve(filePath)];
                    const ExtensionClass = require(filePath);
                    const instance = typeof ExtensionClass === 'function' 
                        ? new ExtensionClass() 
                        : (ExtensionClass.default ? new ExtensionClass.default() : null);

                    if (instance && (instance.type === "anime-board" || instance.type === "book-board")) {
                        const name = instance.constructor.name;
                        extensions.set(name, instance);
                        console.log(`Loaded Extension: ${name}`);
                    }
                } catch (e) {
                    console.error(`Failed to load extension ${file}:`, e);
                }
            }
        }
    } catch (err) {
        console.error("Extension Scan Error:", err);
    }
}

loadExtensions();

// --- STATIC & VIEWS ---
fastify.register(require('@fastify/static'), {
    root: path.join(__dirname, 'public'),
    prefix: '/public/',
});

fastify.get('/', (req, reply) => {
    const stream = fs.createReadStream(path.join(__dirname, 'views', 'index.html'));
    reply.type('text/html').send(stream);
});

// NEW: Books Page
fastify.get('/books', (req, reply) => {
    const stream = fs.createReadStream(path.join(__dirname, 'views', 'books.html'));
    reply.type('text/html').send(stream);
});

fastify.get('/anime/:id', (req, reply) => {
    const stream = fs.createReadStream(path.join(__dirname, 'views', 'anime.html'));
    reply.type('text/html').send(stream);
});

fastify.get('/watch/:id/:episode', (req, reply) => {
    const stream = fs.createReadStream(path.join(__dirname, 'views', 'watch.html'));
    reply.type('text/html').send(stream);
});

// --- API ENDPOINTS ---

// NEW: Books API (Manga)
fastify.get('/api/books/trending', (req, reply) => {
    return new Promise((resolve) => {
        db.all("SELECT full_data FROM trending_books ORDER BY rank ASC LIMIT 10", [], (err, rows) => {
            if (err || !rows) resolve({ results: [] });
            else resolve({ results: rows.map(r => JSON.parse(r.full_data)) });
        });
    });
});

fastify.get('/api/books/popular', (req, reply) => {
    return new Promise((resolve) => {
        db.all("SELECT full_data FROM popular_books ORDER BY rank ASC LIMIT 10", [], (err, rows) => {
            if (err || !rows) resolve({ results: [] });
            else resolve({ results: rows.map(r => JSON.parse(r.full_data)) });
        });
    });
});

// ... [Keep previous Anime/Proxy APIs] ...
// 1. Proxy
fastify.get('/api/proxy', async (req, reply) => {
    const { url, referer, origin, userAgent } = req.query;
    if (!url) return reply.code(400).send("No URL provided");

    const headers = {
        'User-Agent': userAgent || "Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/120.0.0.0 Safari/537.36",
        'Accept': '*/*',
        'Accept-Language': 'en-US,en;q=0.9'
    };
    if (referer) headers['Referer'] = referer;
    if (origin) headers['Origin'] = origin;

    try {
        const response = await fetch(url, { headers, redirect: 'follow' });
        if (!response.ok) return reply.code(response.status).send(`Proxy Error: ${response.statusText}`);

        reply.header('Access-Control-Allow-Origin', '*');
        reply.header('Access-Control-Allow-Methods', 'GET, OPTIONS');
        const contentType = response.headers.get('content-type');
        if (contentType) reply.header('Content-Type', contentType);

        const isM3U8 = (contentType && (contentType.includes('mpegurl'))) || url.includes('.m3u8');

        if (isM3U8) {
            const text = await response.text();
            const baseUrl = new URL(response.url);
            const newText = text.replace(/^(?!#)(?!\s*$).+/gm, (line) => {
                line = line.trim();
                let absoluteUrl;
                try { absoluteUrl = new URL(line, baseUrl).href; } catch(e) { return line; }
                const proxyParams = new URLSearchParams();
                proxyParams.set('url', absoluteUrl);
                if (referer) proxyParams.set('referer', referer);
                if (origin) proxyParams.set('origin', origin);
                if (userAgent) proxyParams.set('userAgent', userAgent);
                return `/api/proxy?${proxyParams.toString()}`;
            });
            return newText;
        } else {
            const { Readable } = require('stream');
            return reply.send(Readable.fromWeb(response.body));
        }
    } catch (err) {
        fastify.log.error(err);
        return reply.code(500).send("Internal Server Error");
    }
});

// Extensions
fastify.get('/api/extensions', async (req, reply) => {
    return { extensions: Array.from(extensions.keys()) };
});

fastify.get('/api/extension/:name/settings', async (req, reply) => {
    const name = req.params.name;
    const ext = extensions.get(name);
    if (!ext) return { error: "Extension not found" };
    if (!ext.getSettings) return { episodeServers: ["default"], supportsDub: false };
    return ext.getSettings();
});

fastify.get('/api/watch/stream', async (req, reply) => {
    const { animeId, episode, server, category, ext } = req.query;
    const extension = extensions.get(ext);
    if (!extension) return { error: "Extension not found" };

    const animeData = await new Promise((resolve) => {
        db.get("SELECT full_data FROM anime WHERE id = ?", [animeId], (err, row) => {
            if (err || !row) resolve(null);
            else resolve(JSON.parse(row.full_data));
        });
    });

    if (!animeData) return { error: "Anime metadata not found" };

    try {
        const searchOptions = {
            query: animeData.title.english || animeData.title.romaji,
            dub: category === 'dub',
            media: {
                romajiTitle: animeData.title.romaji,
                englishTitle: animeData.title.english || "",
                startDate: animeData.startDate || { year: 0, month: 0, day: 0 }
            }
        };

        const searchResults = await extension.search(searchOptions);
        if (!searchResults || searchResults.length === 0) return { error: "Anime not found on provider" };

        const bestMatch = searchResults[0];
        const episodes = await extension.findEpisodes(bestMatch.id);
        const targetEp = episodes.find(e => e.number === parseInt(episode));

        if (!targetEp) return { error: "Episode not found" };

        const serverName = server || "default";
        const streamData = await extension.findEpisodeServer(targetEp, serverName);
        return streamData;
    } catch (err) {
        return { error: err.message };
    }
});

fastify.get('/api/anime/:id', (req, reply) => {
    const id = req.params.id;
    return new Promise((resolve) => {
        db.get("SELECT full_data FROM anime WHERE id = ?", [id], (err, row) => {
             if(err) resolve({ error: "Database error" });
             else if (!row) resolve({ error: "Anime not found" });
             else resolve(JSON.parse(row.full_data));
        });
    });
});

fastify.get('/api/search/books', async (req, reply) => {
    const query = req.query.q;
    if (!query || query.length < 2) return { results: [] };

    // A. Local DB Search (Prioritized)
    const dbResults = await new Promise((resolve) => {
        const sql = `SELECT full_data FROM books WHERE full_data LIKE ? LIMIT 50`;
        db.all(sql, [`%${query}%`], (err, rows) => {
            if (err || !rows) resolve([]);
            else {
                try {
                    const results = rows.map(row => JSON.parse(row.full_data));
                    const clean = results.filter(book => {
                        const searchTerms = [
                            book.title.english, 
                            book.title.romaji, 
                            book.title.native,
                            ...(book.synonyms || [])
                        ].filter(Boolean).map(t => t.toLowerCase());
                        return searchTerms.some(term => term.includes(query.toLowerCase()));
                    });
                    resolve(clean.slice(0, 10));
                } catch (e) { resolve([]); }
            }
        });
    });

    if (dbResults.length > 0) {
        return { results: dbResults };
    }

    // B. Live AniList Fallback (If Local DB is empty/missing data)
    try {
        console.log(`[Books] Local DB miss for "${query}", fetching live...`);
        const gql = `
        query ($search: String) {
            Page(page: 1, perPage: 5) {
                media(search: $search, type: MANGA, isAdult: false) {
                    id title { romaji english native } 
                    coverImage { extraLarge large } 
                    bannerImage description averageScore format 
                    seasonYear startDate { year }
                }
            }
        }`;
        
        const response = await fetch('https://graphql.anilist.co', {
            method: 'POST',
            headers: { 'Content-Type': 'application/json', 'Accept': 'application/json' },
            body: JSON.stringify({ query: gql, variables: { search: query } })
        });
        
        const liveData = await response.json();
        if (liveData.data && liveData.data.Page.media.length > 0) {
            return { results: liveData.data.Page.media };
        }
    } catch(e) { 
        console.error("Live Search Error:", e.message); 
    }

    // C. Extensions Fallback (If not on AniList at all)
    let extResults = [];
    for (const [name, ext] of extensions) {
        // UPDATED: Check for 'book-board' or 'manga-board'
        if ((ext.type === 'book-board' || ext.type === 'manga-board') && ext.search) {
            try {
                console.log(`[${name}] Searching for book: ${query}`);
                const matches = await ext.search({
                    query: query,
                    media: {
                        romajiTitle: query,
                        englishTitle: query,
                        startDate: { year: 0, month: 0, day: 0 }
                    }
                });

                if (matches && matches.length > 0) {
                    extResults = matches.map(m => ({
                        id: m.id,
                        title: { romaji: m.title, english: m.title },
                        coverImage: { large: m.image || '' },
                        // UPDATED: Try to get score from extension if available
                        averageScore: m.rating || m.score || null,
                        format: 'MANGA', 
                        seasonYear: null,
                        isExtensionResult: true 
                    }));
                    break; 
                }
            } catch (e) {
                console.error(`Extension search failed for ${name}:`, e);
            }
        }
    }

    return { results: extResults };
});

fastify.get('/api/book/:id/chapters', async (req, reply) => {
    const id = req.params.id;
    
    // Helper to get metadata (Local or Live)
    let bookData = await new Promise((resolve) => {
        db.get("SELECT full_data FROM books WHERE id = ?", [id], (err, row) => {
            if (err || !row) resolve(null);
            else resolve(JSON.parse(row.full_data));
        });
    });

    if (!bookData) {
        try {
            const query = `query ($id: Int) { Media(id: $id, type: MANGA) { title { romaji english } startDate { year month day } } }`;
            const res = await fetch('https://graphql.anilist.co', {
                method: 'POST',
                headers: { 'Content-Type': 'application/json' },
                body: JSON.stringify({ query, variables: { id: parseInt(id) } }) 
            });
            const d = await res.json();
            if(d.data?.Media) bookData = d.data.Media;
        } catch(e) {}
    }

    if (!bookData) return { chapters: [] };

    const titles = [bookData.title.english, bookData.title.romaji].filter(t => t);
    const searchTitle = titles[0]; // Prefer English, fallback to Romaji
    
    const allChapters = []; 

    // Create an array of promises for all matching extensions
    const searchPromises = Array.from(extensions.entries())
        .filter(([name, ext]) => (ext.type === 'book-board' || ext.type === 'manga-board') && ext.search && ext.findChapters)
        .map(async ([name, ext]) => {
            try {
                console.log(`[${name}] Searching chapters for: ${searchTitle}`);
                
                // Pass strict search options
                const matches = await ext.search({
                    query: searchTitle,
                    media: {
                        romajiTitle: bookData.title.romaji,
                        englishTitle: bookData.title.english,
                        startDate: bookData.startDate
                    }
                });

                if (matches && matches.length > 0) {
                    // Use the first match to find chapters
                    const best = matches[0];
                    const chaps = await ext.findChapters(best.id);
                    
                    if (chaps && chaps.length > 0) {
                        console.log(`[${name}] Found ${chaps.length} chapters.`);
                        chaps.forEach(ch => {
                            const num = parseFloat(ch.number);
                            // Add to aggregator with provider tag
                            allChapters.push({
                                id: ch.id,
                                number: num,
                                title: ch.title,
                                date: ch.releaseDate,
                                provider: name
                            });
                        });
                    }
                } else {
                    console.log(`[${name}] No matches found for book.`);
                }
            } catch (e) {
                console.error(`Failed to fetch chapters from ${name}:`, e.message);
            }
        });

    // Wait for all providers to finish (in parallel)
    await Promise.all(searchPromises);

    // Sort all aggregated chapters by number
    const sortedChapters = allChapters.sort((a, b) => a.number - b.number);
    
    return { chapters: sortedChapters };
});

fastify.get('/api/book/:id', async (req, reply) => {
    const id = req.params.id;
    
    // 1. Try Local DB
    const bookData = await new Promise((resolve) => {
        db.get("SELECT full_data FROM books WHERE id = ?", [id], (err, row) => {
             if(err || !row) resolve(null);
             else resolve(JSON.parse(row.full_data));
        });
    });

    if (bookData) return bookData;

    // 2. Live Fallback (If not in DB)
    try {
        console.log(`[Book] Local miss for ID ${id}, fetching live...`);
        const query = `
        query ($id: Int) {
            Media(id: $id, type: MANGA) {
                id idMal title { romaji english native userPreferred } type format status description
                startDate { year month day } endDate { year month day } season seasonYear seasonInt
                episodes duration chapters volumes countryOfOrigin isLicensed source hashtag
                trailer { id site thumbnail } updatedAt coverImage { extraLarge large medium color }
                bannerImage genres synonyms averageScore meanScore popularity isLocked trending favourites
                tags { id name description category rank isGeneralSpoiler isMediaSpoiler isAdult userId }
                relations { edges { relationType node { id title { romaji } } } }
                characters(page: 1, perPage: 10) { nodes { id name { full } } }
                studios { nodes { id name isAnimationStudio } }
                isAdult nextAiringEpisode { airingAt timeUntilAiring episode }
                externalLinks { url site } 
                rankings { id rank type format year season allTime context }
            }
        }`;
        
        // CRITICAL FIX: Ensure ID is parsed as Integer for AniList GraphQL
        const response = await fetch('https://graphql.anilist.co', {
            method: 'POST',
            headers: { 'Content-Type': 'application/json', 'Accept': 'application/json' },
            body: JSON.stringify({ query, variables: { id: parseInt(id) } })
        });
        
        const data = await response.json();
        if (data.data && data.data.Media) {
            return data.data.Media;
        }
        return { error: "Book not found on AniList" };
    } catch(e) {
        fastify.log.error(e);
        return { error: "Fetch error" };
    }
});

fastify.get('/book/:id', (req, reply) => {
    const stream = fs.createReadStream(path.join(__dirname, 'views', 'book.html'));
    reply.type('text/html').send(stream);
});

fastify.get('/api/search/local', (req, reply) => {
    const query = req.query.q;
    if (!query || query.length < 2) return { results: [] };
    // Increased limit to 50 here as well for consistency
    const sql = `SELECT full_data FROM anime WHERE full_data LIKE ? LIMIT 50`;
    return new Promise((resolve) => {
        db.all(sql, [`%${query}%`], (err, rows) => {
            if (err) resolve({ results: [] });
            else {
                try {
                    const results = rows.map(row => JSON.parse(row.full_data));
                    const cleanResults = results.filter(anime => {
                        const q = query.toLowerCase();
                        const titles = [
                            anime.title.english,
                            anime.title.romaji,
                            anime.title.native,
                            ...(anime.synonyms || [])
                        ].filter(Boolean).map(t => t.toLowerCase());
                        return titles.some(t => t.includes(q));
                    });
                    resolve({ results: cleanResults.slice(0, 10) });
                } catch (e) {
                    resolve({ results: [] });
                }
            }
        });
    });
});

fastify.get('/api/trending', (req, reply) => {
    return new Promise((resolve) => db.all("SELECT full_data FROM trending ORDER BY rank ASC LIMIT 10", [], (err, rows) => resolve({ results: rows ? rows.map(r => JSON.parse(r.full_data)) : [] })));
});

fastify.get('/api/top-airing', (req, reply) => {
    return new Promise((resolve) => db.all("SELECT full_data FROM top_airing ORDER BY rank ASC LIMIT 10", [], (err, rows) => resolve({ results: rows ? rows.map(r => JSON.parse(r.full_data)) : [] })));
});

const start = async () => {
    try {
        await fastify.listen({ port: 3000, host: '0.0.0.0' });
        console.log(`Server running at http://localhost:3000`);
        animeMetadata();
    } catch (err) {
        fastify.log.error(err);
        process.exit(1);
    }
};

start();