const express = require('express');
const router  = express.Router();
const db      = require('../../db');
const { authenticate, requireAdmin } = require('../../middleware/auth');

const TMDB_BASE = 'https://api.themoviedb.org/3';
const XREL_BASE = 'https://api.xrel.to/v2';
const THIS_YEAR = new Date().getFullYear();
const MIN_YEAR  = THIS_YEAR - 1;

// Sprachen die wir NICHT wollen
const BLOCKED_LANGS = new Set(['tr', 'hi', 'te', 'ta', 'ml', 'kn', 'bn', 'mr', 'pa']);

// Genre-IDs die wir nicht wollen (nur wenn das der EINZIGE Genre ist)
// 16=Animation, 99=Documentary – aber nur rausfiltern wenn explizit kein Spielfilm-Genre dabei
const DOC_GENRE_ID = 99;

// Umlaut-Normalisierung für xREL-Suche (Nürnberg → Nuernberg etc.)
function normalizeUmlauts(s) {
  return (s||'')
    .replace(/ä/g,'ae').replace(/ö/g,'oe').replace(/ü/g,'ue')
    .replace(/Ä/g,'Ae').replace(/Ö/g,'Oe').replace(/Ü/g,'Ue')
    .replace(/ß/g,'ss');
}

// ── SQLite Cache ──────────────────────────────────────────────────────────────
function cacheGet(key) {
  const row = db.prepare('SELECT value, expires_at FROM xrel_cache WHERE cache_key=?').get(key);
  if (!row) return undefined;
  if (Date.now() > row.expires_at) { db.prepare('DELETE FROM xrel_cache WHERE cache_key=?').run(key); return undefined; }
  try { return JSON.parse(row.value); } catch { return undefined; }
}
function cacheSet(key, value, ttlMs = 12 * 60 * 60 * 1000) {
  db.prepare('INSERT OR REPLACE INTO xrel_cache (cache_key,value,expires_at) VALUES (?,?,?)')
    .run(key, JSON.stringify(value), Date.now() + ttlMs);
}

// ── TMDb ──────────────────────────────────────────────────────────────────────
function getToken() {
  return db.prepare("SELECT value FROM admin_settings WHERE key='tmdb_token'").get()?.value || '';
}
async function tmdb(path, params = {}) {
  const token = getToken();
  if (!token) throw new Error('Kein TMDb API-Token konfiguriert');
  const url = new URL(TMDB_BASE + path);
  url.searchParams.set('language', 'de-DE');
  url.searchParams.set('region', 'DE');
  for (const [k, v] of Object.entries(params)) url.searchParams.set(k, v);
  const res = await fetch(url.toString(), { headers: { Authorization: `Bearer ${token}`, Accept: 'application/json' } });
  if (!res.ok) throw new Error(`TMDb ${res.status}`);
  return res.json();
}
let genreCache = null;
async function getGenreMap() {
  if (genreCache) return genreCache;
  const d = await tmdb('/genre/movie/list');
  genreCache = {};
  for (const g of d.genres) genreCache[g.id] = g.name;
  return genreCache;
}
function extractFSK(rd) {
  const de = rd?.results?.find(r => r.iso_3166_1 === 'DE');
  if (!de?.release_dates?.length) return null;
  const sorted = [...de.release_dates].sort((a, b) => a.type === 3 ? -1 : 1);
  for (const r of sorted) { const c = (r.certification||'').trim(); if (c) return c; }
  return null;
}

const RELEASE_TYPE_LABEL = { 2:'Kino (limited)', 3:'Kinostart', 4:'Web', 5:'Retail', 6:'TV' };

function extractReleaseDates(rd) {
  if (!rd?.results) return [];
  // Nur DE und US, Typen 2-5 (kein Premiere=1, kein TV=6)
  const entries = [];
  for (const country of ['DE', 'US']) {
    const c = rd.results.find(r => r.iso_3166_1 === country);
    if (!c) continue;
    for (const r of c.release_dates) {
      if (!r.release_date) continue;
      const label = RELEASE_TYPE_LABEL[r.type];
      if (!label) continue;
      entries.push({
        country,
        label: `${label} (${country})`,
        date: r.release_date.slice(0, 10),
      });
    }
  }
  entries.sort((a, b) => a.date.localeCompare(b.date));
  return entries;
}
async function fetchAllPages(path, maxPages = 3) {
  const first = await tmdb(path, { page: 1 });
  const total = Math.min(first.total_pages || 1, maxPages);
  let results = [...first.results];
  if (total > 1) {
    const extra = await Promise.all(Array.from({ length: total-1 }, (_,i) => tmdb(path, { page: i+2 })));
    for (const p of extra) results = results.concat(p.results);
  }
  return results;
}
function filterMovies(list) {
  const seen = new Set();
  return list.filter(m => {
    if (BLOCKED_LANGS.has(m.original_language)) return false;
    const y = m.release_date ? parseInt(m.release_date.slice(0,4)) : 0;
    if (y > 0 && y < MIN_YEAR) return false;
    if (seen.has(m.id)) return false;
    seen.add(m.id);
    // Reine Dokus rausfiltern
    const genres = m.genre_ids || [];
    if (genres.length === 1 && genres[0] === DOC_GENRE_ID) return false;
    if (genres.length === 0 && m.vote_count < 5) return false;
    return true;
  });
}
function enrichMovie(m, genreMap, fsk, rank) {
  return {
    id: m.id, title: m.title||m.original_title, original_title: m.original_title,
    original_language: m.original_language, poster_path: m.poster_path,
    overview: m.overview, release_date: m.release_date, vote_average: m.vote_average,
    genres: (m.genre_ids||[]).map(id => genreMap[id]).filter(Boolean),
    fsk: fsk??null, rank: rank??null,
  };
}

// ── xREL ─────────────────────────────────────────────────────────────────────
const XREL_DATE_LABEL = {
  'de-cine':   'Kinostart (DE)',
  'us-cine':   'Kinostart (US)',
  'de-web':    'Web (DE)',
  'us-web':    'Web (US)',
  'de-retail': 'Retail (DE)',
  'us-retail': 'Retail (US)',
  'de-hd':     'Blu-ray (DE)',
  'us-hd':     'Blu-ray (US)',
  'de-rental': 'Rental (DE)',
  'us-rental': 'Rental (US)',
  'r5':        'R5',
};

const QUALITY_BLOCKLIST = r => /\b(2160p|4k|uhd|uhdbluray|uhdbd|remux)\b/i.test(r) || /COMPLETE[._](?:BLURAY|BD)/i.test(r);

async function xrelFetch(path, params = {}) {
  const url = new URL(XREL_BASE + path);
  for (const [k,v] of Object.entries(params)) url.searchParams.set(k, String(v));
  const res = await fetch(url.toString(), {
    headers: { Accept: 'application/json' }, signal: AbortSignal.timeout(7000),
  });
  if (res.status === 429) {
    await new Promise(r => setTimeout(r, (parseInt(res.headers.get('Retry-After')||'10'))*1000));
    const r2 = await fetch(url.toString(), { headers: { Accept: 'application/json' }, signal: AbortSignal.timeout(7000) });
    if (!r2.ok) throw new Error(`xREL ${r2.status}`);
    return r2.json();
  }
  if (!res.ok) throw new Error(`xREL ${res.status}`);
  return res.json();
}

// Einzige Funktion für xREL: benutzt immer die ext_info_id und gibt max 5 deutsche ≤1080p Releases
// Cache-Key: tmdb_id (immer eindeutig, konsistent zwischen Badge und Modal)
async function getXrelData(tmdbId, imdbId, title, originalTitle) {
  const cacheKey = `xrel:tmdb:${tmdbId}`;
  const cached = cacheGet(cacheKey);
  if (cached !== undefined) return cached;

  const clean = (s) => normalizeUmlauts(s||'').replace(/[*#!?:]/g,'').trim().toLowerCase();

  // Suchqueries: original, deutsch, und normalisierte Varianten
  // Wichtig: xREL nutzt oft den englischen Originaltitel auch bei deutschen Filmen
  const rawQueries = [originalTitle, title].filter(Boolean).filter((v,i,a) => a.indexOf(v)===i);
  // Normalisierte Versionen (Umlaute) als zusätzliche Queries
  const normQueries = rawQueries.map(q => normalizeUmlauts(q).replace(/[*#!?:]/g,'').trim())
    .filter(q => !rawQueries.map(r => r.replace(/[*#!?:]/g,'').trim()).includes(q));
  const allQueries = [...rawQueries, ...normQueries].filter(Boolean).filter((v,i,a) => a.indexOf(v)===i);

  // Alle parallel suchen
  const searchResults = await Promise.all(allQueries.map(async q => {
    try {
      return {
        q,
        data: await xrelFetch('/search/ext_info.json', {
          q: normalizeUmlauts(q).replace(/[*#!?:]/g,''), type:'movie', limit:10
        })
      };
    } catch(_) { return null; }
  }));

  let extInfoId = null;

  // Strategie 1: IMDb-URI exakter Match (zuverlässigste Methode)
  if (imdbId) {
    for (const r of searchResults) {
      if (!r) continue;
      const hit = (r.data?.results||[]).find(h => (h.uris||[]).includes(`imdb:${imdbId}`));
      if (hit?.id) { extInfoId = hit.id; break; }
    }
  }

  // Strategie 2: Titel/alt_title Match gegen alle Queries (normalisiert)
  if (!extInfoId) {
    const allCleanQueries = allQueries.map(q => clean(q));
    for (const r of searchResults) {
      if (!r?.data?.results) continue;
      for (const h of r.data.results) {
        if (allCleanQueries.includes(clean(h.title)) || allCleanQueries.includes(clean(h.alt_title))) {
          extInfoId = h.id;
          break;
        }
      }
      if (extInfoId) break;
    }
  }

  if (!extInfoId) {
    cacheSet(cacheKey, [], 60*60*1000);
    return [];
  }

  // Releases + ext_info Details parallel holen
  const [sceneData, p2pData, infoData] = await Promise.all([
    xrelFetch('/release/ext_info.json', { id: extInfoId, per_page: 50 }).catch(()=>({})),
    xrelFetch('/p2p/releases.json', { ext_info_id: extInfoId, per_page: 50 }).catch(()=>({})),
    xrelFetch('/ext_info/info.json', { id: extInfoId, type: 'movie' }).catch(()=>({})),
  ]);

  // xREL Erscheinungsdaten
  const xrel_dates = (infoData.release_dates||[])
    .filter(d => XREL_DATE_LABEL[d.type])
    .map(d => ({ label: XREL_DATE_LABEL[d.type], date: d.date }))
    .sort((a,b) => a.date.localeCompare(b.date));

  const results = [];

  for (const r of sceneData.list||[]) {
    if (!/\b(german|deutsch)(\.dl)?\b/i.test(r.dirname||'')) continue;
    if (QUALITY_BLOCKLIST(r.dirname||'')) continue;
    results.push({
      dirname: r.dirname, size: r.size ? `${r.size.number} ${r.size.unit}` : null,
      category: 'Scene', url: r.link_href,
      date: r.time ? new Date(r.time*1000).toISOString().slice(0,10) : null, p2p: false,
    });
  }
  for (const r of p2pData.list||[]) {
    if (r.main_lang !== 'german') continue;
    if (QUALITY_BLOCKLIST(r.dirname||'')) continue;
    results.push({
      dirname: r.dirname, size: r.size_mb ? `${(r.size_mb/1024).toFixed(1)} GB` : null,
      category: r.category?.sub_cat||'P2P', url: r.link_href,
      date: r.pub_time ? new Date(r.pub_time*1000).toISOString().slice(0,10) : null, p2p: true,
    });
  }

  results.sort((a,b) => (b.date||'').localeCompare(a.date||''));
  const top5 = results.slice(0, 5);
  const payload = { releases: top5, xrel_dates };
  cacheSet(cacheKey, payload, top5.length > 0 || xrel_dates.length > 0 ? 12*60*60*1000 : 60*60*1000);
  return payload;
}

// ── Routes ────────────────────────────────────────────────────────────────────

router.get('/now-playing', authenticate, async (req, res) => {
  try {
    const [pages, genreMap] = await Promise.all([fetchAllPages('/movie/now_playing',3), getGenreMap()]);
    const filtered = filterMovies(pages);
    const top10raw = filtered.slice(0,10), restRaw = filtered.slice(10);
    const top10 = await Promise.all(top10raw.map(async (m,i) => {
      let fsk = null;
      try { fsk = extractFSK(await tmdb(`/movie/${m.id}/release_dates`)); } catch(_) {}
      return enrichMovie(m, genreMap, fsk, i+1);
    }));
    res.json([...top10, ...restRaw.map(m => enrichMovie(m,genreMap,null,null))]);
  } catch(e) { res.status(500).json({ error: e.message }); }
});

router.get('/upcoming', authenticate, async (req, res) => {
  try {
    const [pages, genreMap] = await Promise.all([fetchAllPages('/movie/upcoming',3), getGenreMap()]);
    const filtered = filterMovies(pages).filter(m => m.release_date);
    filtered.sort((a,b) => a.release_date.localeCompare(b.release_date));
    const groups = {};
    for (const m of filtered) {
      const d = new Date(m.release_date), dow = d.getDay();
      const mon = new Date(d); mon.setDate(d.getDate()+(dow===0?-6:1-dow));
      const key = mon.toISOString().slice(0,10);
      if (!groups[key]) groups[key] = [];
      groups[key].push(enrichMovie(m,genreMap,null,null));
    }
    res.json(groups);
  } catch(e) { res.status(500).json({ error: e.message }); }
});

// Modal: TMDb-Daten sofort, xREL via separaten Endpoint
router.get('/movie/:id', authenticate, async (req, res) => {
  try {
    const [detail, genreMap, extIds] = await Promise.all([
      tmdb(`/movie/${req.params.id}`, { append_to_response: 'credits,release_dates' }),
      getGenreMap(),
      tmdb(`/movie/${req.params.id}/external_ids`).catch(()=>({})),
    ]);
    const fsk = extractFSK(detail.release_dates);
    const imdbId = extIds.imdb_id || null;
    res.json({
      id: detail.id, title: detail.title||detail.original_title,
      original_title: detail.original_title, tagline: detail.tagline,
      overview: detail.overview, poster_path: detail.poster_path,
      backdrop_path: detail.backdrop_path, release_date: detail.release_date,
      runtime: detail.runtime, vote_average: detail.vote_average,
      genres: (detail.genres||[]).map(g => g.name), fsk,
      cast: (detail.credits?.cast||[]).slice(0,8).map(a => a.name),
      director: detail.credits?.crew?.find(c => c.job==='Director')?.name||null,
      tmdb_url: `https://www.themoviedb.org/movie/${detail.id}`,
      imdb_url: imdbId ? `https://www.imdb.com/title/${imdbId}` : null,
      imdb_id: imdbId,
      countries: (detail.production_countries||[]).map(c => c.name),
    });
  } catch(e) { res.status(500).json({ error: e.message }); }
});

// xREL on-demand – ?refresh=1 ignoriert Cache, ?imdb_id=tt...&title=...&orig=... vermeidet TMDb-Calls
router.get('/movie/:id/xrel', authenticate, async (req, res) => {
  try {
    const cacheKey = `xrel:tmdb:${req.params.id}`;
    const forceRefresh = req.query.refresh === '1';

    // Cache prüfen: befüllte Einträge immer zurückgeben
    // Bei refresh=1 oder leerem Cache: xREL aufrufen
    if (!forceRefresh) {
      const cached = cacheGet(cacheKey);
      if (cached !== undefined) {
        const releases = Array.isArray(cached) ? cached : (cached.releases || []);
        const xrel_dates = Array.isArray(cached) ? [] : (cached.xrel_dates || []);
        if (releases.length > 0 || xrel_dates.length > 0) {
          return res.json({ xrel: releases, xrel_dates, has_xrel: releases.length > 0 });
        }
      }
    }
    // Cache löschen bei refresh (damit neu gecacht wird)
    if (forceRefresh) {
      db.prepare('DELETE FROM xrel_cache WHERE cache_key=?').run(cacheKey);
    }
    // Immer xREL aufrufen wenn kein befüllter Cache

    // Titel + IMDb-ID aus Query-Params wenn vorhanden (spart 2 TMDb-Calls)
    let imdbId    = req.query.imdb_id || null;
    let title     = req.query.title    || null;
    let origTitle = req.query.orig     || null;

    if (!title) {
      const [detail, extIds] = await Promise.all([
        tmdb(`/movie/${req.params.id}`, { append_to_response: '' }).catch(()=>({})),
        tmdb(`/movie/${req.params.id}/external_ids`).catch(()=>({})),
      ]);
      imdbId    = extIds.imdb_id || null;
      title     = detail.title || null;
      origTitle = detail.original_title || null;
    }

    const data = await getXrelData(req.params.id, imdbId, title, origTitle);
    const releases  = Array.isArray(data) ? data : (data.releases  || []);
    const xrel_dates = Array.isArray(data) ? [] : (data.xrel_dates || []);
    res.json({ xrel: releases, xrel_dates, has_xrel: releases.length > 0 });
  } catch(e) { res.status(500).json({ error: e.message }); }
});



// GET /api/tools/media/xrel-cached?ids=1,2,3 – welche Filme haben Releases im Cache
router.get('/xrel-cached', authenticate, (req, res) => {
  const ids = (req.query.ids || '').split(',').map(Number).filter(Boolean);
  if (!ids.length) return res.json({});
  const result = {};
  for (const id of ids) {
    const cached = cacheGet(`xrel:tmdb:${id}`);
    result[id] = cached !== undefined && (Array.isArray(cached) ? cached.length > 0 : cached.releases?.length > 0);
  }
  res.json(result);
});

router.get('/favorites', authenticate, (req, res) => {
  res.json(db.prepare('SELECT * FROM movie_favorites WHERE user_id=? ORDER BY release_date ASC').all(req.user.id));
});
router.post('/favorites', authenticate, (req, res) => {
  const { tmdb_id, title, poster_path, release_date_de, release_date, genres, fsk } = req.body;
  if (!tmdb_id) return res.status(400).json({ error: 'tmdb_id fehlt' });
  try {
    db.prepare(`INSERT OR IGNORE INTO movie_favorites (user_id,tmdb_id,title,poster_path,release_date_de,release_date,genres,fsk) VALUES (?,?,?,?,?,?,?,?)`)
      .run(req.user.id, tmdb_id, title||'', poster_path||'', release_date_de||'', release_date||'', JSON.stringify(genres||[]), fsk||'');
    res.json({ ok: true });
  } catch(e) { res.status(500).json({ error: e.message }); }
});
router.delete('/favorites/:tmdb_id', authenticate, (req, res) => {
  db.prepare('DELETE FROM movie_favorites WHERE user_id=? AND tmdb_id=?').run(req.user.id, Number(req.params.tmdb_id));
  res.json({ ok: true });
});
router.get('/settings', authenticate, requireAdmin, (req, res) => res.json({ configured: !!getToken() }));
router.put('/settings', authenticate, requireAdmin, (req, res) => {
  const { tmdb_token } = req.body;
  if (typeof tmdb_token !== 'string') return res.status(400).json({ error: 'tmdb_token fehlt' });
  db.prepare('INSERT OR REPLACE INTO admin_settings (key,value) VALUES (?,?)').run('tmdb_token', tmdb_token.trim());
  genreCache = null;
  res.json({ ok: true });
});


// DEBUG ext_info – nach Test entfernen
router.get('/debug-extinfo', authenticate, async (req, res) => {
  const id = req.query.id || '';
  if (!id) return res.json({ error: 'id required' });
  try {
    const data = await xrelFetch('/ext_info/info.json', { id, type: 'movie' });
    res.json(data);
  } catch(e) { res.status(500).json({ error: e.message }); }
});

// DEBUG – nach Test entfernen
router.get('/debug-xrel3', authenticate, async (req, res) => {
  const title    = req.query.title    || '';
  const orig     = req.query.orig     || '';
  const imdb_id  = req.query.imdb_id  || null;
  const log = { title, orig, imdb_id };
  try {
    const clean = (s) => normalizeUmlauts(s||'').replace(/[*#!?:]/g,'').trim().toLowerCase();
    const rawQueries = [orig, title].filter(Boolean).filter((v,i,a) => a.indexOf(v)===i);
    const normQueries = rawQueries.map(q => normalizeUmlauts(q).replace(/[*#!?:]/g,'').trim())
      .filter(q => !rawQueries.map(r => r.replace(/[*#!?:]/g,'').trim()).includes(q));
    log.rawQueries = rawQueries;
    log.normQueries = normQueries;
    log.allQueries = [...rawQueries, ...normQueries].filter(Boolean).filter((v,i,a) => a.indexOf(v)===i);

    const results = [];
    for (const q of log.allQueries) {
      try {
        const data = await xrelFetch('/search/ext_info.json', {
          q: normalizeUmlauts(q).replace(/[*#!?:]/g,''), type:'movie', limit:5
        });
        results.push({
          query: normalizeUmlauts(q).replace(/[*#!?:]/g,''),
          hits: (data.results||[]).map(h => ({ id: h.id, title: h.title, alt_title: h.alt_title, uris: h.uris }))
        });
      } catch(e) { results.push({ query: q, error: e.message }); }
    }
    log.searchResults = results;
  } catch(e) { log.error = e.message; }
  res.json(log);
});

module.exports = router;