import { S } from '../state.js';
import { esc, toast, fmtCount } from '../utils.js';
import { api, deezerSearch, deezerLastError, deezerLookupAlbum, fetchRomajiIndex, dispArtistById } from '../api.js';
import { makeCard, makeAlbumCard, makeGlobalTrackItem, makeSongItem, mkSection } from '../ui/components.js';
import { playPreview } from '../player/player.js';
import { openDlModal } from '../ui/ui.js';
import { closeNowPlaying } from '../player/nowplaying.js';
// Circular — safe (called inside function bodies)
import { navigate } from './navigation.js';
import { getArtistImage } from './home.js';

// ─── ROMAJI → HIRAGANA ───
let _wanakana = null;
async function _romajiToHiragana(q) {
  if (!/^[a-z\s'-]+$/i.test(q.trim())) return null;
  try {
    if (!_wanakana) _wanakana = await import('https://cdn.jsdelivr.net/npm/wanakana@5/esm/wanakana.js');
    const h = _wanakana.toHiragana(q.trim(), { passRomaji: false });
    return /[぀-ゟ]/.test(h) ? h : null;
  } catch { return null; }
}

function _mergeUniq(a, b) {
  const seen = new Set(a.map(x => x.id));
  return [...a, ...(b || []).filter(x => !seen.has(x.id))];
}

// ─── LOCAL SEARCH ───
export function onLocalSearch(val) {
  clearTimeout(S.searchTimer);
  if(!val.trim()) { navigate('home'); return; }
  navigate('search');
  S.searchTimer = setTimeout(() => doLocalSearch(val), 350);
}

export async function doLocalSearch(q, el) {
  if (!el) el = document.getElementById('search-results');
  el.innerHTML = '<div class="spinner"></div>';
  try {
    const hiragana = await _romajiToHiragana(q);
    const isRomaji = /^[a-z\s'-]+$/i.test(q.trim());
    const [r, r2, romajiIdx] = await Promise.all([
      api('search3', `&query=${encodeURIComponent(q)}&songCount=30&albumCount=10&artistCount=6`),
      hiragana ? api('search3', `&query=${encodeURIComponent(hiragana)}&songCount=20&albumCount=6&artistCount=4`) : Promise.resolve(null),
      isRomaji ? fetchRomajiIndex() : Promise.resolve(null),
    ]);
    const res  = r.searchResult3  || {};
    const res2 = r2?.searchResult3 || {};
    el.innerHTML = '';
    const artists = _mergeUniq(res.artist||[], res2.artist);
    const albums  = _mergeUniq(res.album ||[], res2.album);
    const qLow = q.trim().toLowerCase();
    const romajiHits = romajiIdx ? romajiIdx.filter(e => e.r.includes(qLow)) : [];
    const songs = _mergeUniq(_mergeUniq(res.song||[], res2.song), romajiHits);

    if(!artists.length && !albums.length && !songs.length) {
      el.innerHTML = '<div class="empty-state"><div class="icon">🔍</div><p>Keine Ergebnisse</p></div>'; return;
    }
    if(artists.length) {
      const s = mkSection('Künstler');
      const g = document.createElement('div'); g.className = 'scroll-row';
      artists.forEach(a => {
        const c = makeCard(dispArtistById(a.id, a.name), a.albumCount+' Alben', null, '🎤');
        c.classList.add('artist-card');
        c.onclick = () => navigate('artist-detail', a);
        g.appendChild(c);
        getArtistImage(a.id).then(img => {
          if(!img) return;
          const artEl = c.querySelector('.card-art');
          if(!artEl) return;
          artEl.innerHTML = `<img src="${img}" loading="lazy" onerror="this.parentNode.innerHTML='<div class=\\'no-art\\'>🎤</div>'">`;
        });
      });
      s.appendChild(g); el.appendChild(s);
    }
    if(albums.length) {
      const s = mkSection('Alben');
      const g = document.createElement('div'); g.className = 'scroll-row';
      albums.forEach(a => g.appendChild(makeAlbumCard(a)));
      s.appendChild(g); el.appendChild(s);
    }
    if(songs.length) {
      const sec = mkSection('Titel');
      const list = document.createElement('div'); list.className = 'song-list';
      songs.forEach((so,i) => list.appendChild(makeSongItem(so, i, songs, { singlePlay: true })));
      sec.appendChild(list); el.appendChild(sec);
    }
  } catch(e) { el.innerHTML = `<p style="color:var(--danger)">${e.message}</p>`; }
}

// ─── HEADER SEARCH ───
export function onHeaderSearch(val) {
  const overlay  = document.getElementById('header-search-overlay');
  const clearBtn = document.getElementById('header-search-clear');
  if (clearBtn) clearBtn.style.display = val ? 'block' : 'none';
  clearTimeout(S._headerSearchTimer);
  if (!val.trim()) { if (overlay) overlay.style.display = 'none'; return; }
  if (overlay) {
    const header = document.getElementById('mobile-header');
    if (header) overlay.style.top = header.offsetHeight + 'px';
    overlay.style.display = 'block';
  }
  const el = document.getElementById('header-search-results');
  S._headerSearchTimer = setTimeout(() => doLocalSearch(val, el), 300);
}

export function onMobileSearch(val) { onHeaderSearch(val); }

// ─── GLOBAL (DEEZER) SEARCH ───
export function onGlobalSearch(val) {
  clearTimeout(S.globalSearchTimer);
  const el = document.getElementById('global-search-results');
  if(!val.trim()) { el.innerHTML = '<div class="empty-state"><div class="icon">🔍</div><p>Gib einen Suchbegriff ein</p></div>'; return; }
  el.innerHTML = '<div class="spinner"></div>';
  S.globalSearchTimer = setTimeout(() => doGlobalSearch(val), 400);
}

export async function doGlobalSearch(q) {
  const el = document.getElementById('global-search-results');
  try {
    const [tracks, albums, artists] = await Promise.all([
      deezerSearch(q,'musicTrack',25),
      deezerSearch(q,'album',10),
      deezerSearch(q,'musicArtist',6),
    ]);
    el.innerHTML = '';
    const trackResults = tracks.filter(t => t.wrapperType === 'track');

    if(artists.length) {
      const s = mkSection('Künstler');
      const row = document.createElement('div'); row.className = 'scroll-row';
      artists.forEach(a => {
        const sub = a.fanCount ? `${fmtCount(a.fanCount)} Fans` : 'Deezer Künstler';
        const c = makeCard(a.artistName, sub, a.artworkUrl100 || null, '🎤');
        c.onclick = () => loadDeezerArtistResults(a.artistId, a.artistName, a.fanCount);
        row.appendChild(c);
        if (a.artworkUrl100) return; // Deezer artists already carry a photo — no extra lookup
        deezerSearch(a.artistName,'album',1).then(res => {
          if(!res[0]) return;
          const imgUrl = res[0].artworkUrl100?.replace('100x100','300x300');
          if(!imgUrl) return;
          const artEl = c.querySelector('.card-art'); if(!artEl) return;
          const img = document.createElement('img');
          img.src = imgUrl; img.loading = 'lazy'; img.style.cssText = 'width:100%;height:100%;object-fit:cover;transition:transform .4s';
          const overlay = artEl.querySelector('.play-overlay');
          artEl.innerHTML = ''; artEl.appendChild(img); if(overlay) artEl.appendChild(overlay);
          img.onerror = () => { artEl.innerHTML = '<div class="no-art">🎤</div>'; if(overlay) artEl.appendChild(overlay); };
          c.addEventListener('mouseenter', () => img.style.transform = 'scale(1.05)');
          c.addEventListener('mouseleave', () => img.style.transform = 'scale(1)');
        }).catch(() => {});
      });
      s.appendChild(row); el.appendChild(s);
    }
    if(albums.length) {
      const s = mkSection('Alben');
      const row = document.createElement('div'); row.className = 'scroll-row';
      albums.forEach(a => {
        const art = a.artworkUrl100?.replace('100x100','300x300');
        const c = makeCard(a.collectionName, a.artistName, art, '💿');
        c.querySelector('.play-btn').onclick = (e) => { e.stopPropagation(); loadDeezerAlbum(a); };
        c.querySelector('.dl-btn-overlay')?.remove();
        const dlOverlay = document.createElement('button');
        dlOverlay.className = 'dl-btn-overlay';
        dlOverlay.title = 'Auf Server laden';
        dlOverlay.innerHTML = `<svg width="13" height="13" viewBox="0 0 24 24" fill="none" stroke="currentColor" stroke-width="2"><path d="M21 15v4a2 2 0 0 1-2 2H5a2 2 0 0 1-2-2v-4"/><polyline points="7 10 12 15 17 10"/><line x1="12" y1="15" x2="12" y2="3"/></svg>`;
        dlOverlay.onclick = (e) => { e.stopPropagation(); openDlModal({artistName:a.artistName,trackName:a.collectionName,artworkUrl100:a.artworkUrl100,collectionName:a.collectionName,isAlbum:true,deezerData:a}); };
        c.querySelector('.play-overlay').appendChild(dlOverlay);
        c.onclick = () => loadDeezerAlbum(a);
        row.appendChild(c);
      });
      s.appendChild(row); el.appendChild(s);
    }
    if(trackResults.length) {
      const s = mkSection('Titel');
      const list = document.createElement('div'); list.className = 'song-list';
      trackResults.forEach((t,i) => list.appendChild(makeGlobalTrackItem(t, i, trackResults)));
      s.appendChild(list); el.appendChild(s);
    }
    if(!artists.length && !albums.length && !trackResults.length) {
      const err = deezerLastError();
      if (err) {
        // Distinguish "genuinely no results" from "search backend is down" so the user knows where
        // the problem is.
        const detail = err === 'network'
          ? 'Keine Verbindung zur Deezer-Such-API (Netzwerk/Backend). Läuft dein Backend?'
          : `Deezer-Suche nicht verfügbar (Fehler ${err}).`;
        el.innerHTML = `<div class="empty-state"><div class="icon">⚠️</div><p>Deezer-Suche gerade nicht verfügbar</p><p style="font-size:12px;color:var(--text3);max-width:420px;margin:8px auto 0">${detail}</p></div>`;
      } else {
        el.innerHTML = '<div class="empty-state"><div class="icon">🔍</div><p>Keine Ergebnisse gefunden</p></div>';
      }
    }
  } catch(e) { el.innerHTML = `<p style="color:var(--danger)">Suche fehlgeschlagen: ${e.message}</p>`; }
}

export async function loadDeezerAlbum(album) {
  try {
    const tracks = await deezerLookupAlbum(album.collectionId);
    if(!tracks.length) { toast('Keine Tracks gefunden'); return; }
    const el = document.getElementById('global-search-results');
    const s = document.createElement('div'); s.className = 'search-section';
    s.innerHTML = `<div style="display:flex;align-items:center;gap:10px;margin-bottom:12px">
      <button class="back-btn" style="margin:0" onclick="document.getElementById('global-search-input').dispatchEvent(new Event('input'))"><svg width="13" height="13" viewBox="0 0 24 24" fill="none" stroke="currentColor" stroke-width="2"><polyline points="15 18 9 12 15 6"/></svg>Zurück</button>
      <div style="flex:1">
        <div style="font-size:15px;font-weight:700">${esc(album.collectionName)}</div>
        <div style="font-size:12px;color:var(--text2)">${esc(album.artistName)}</div>
      </div>
      <button class="btn-outline blue" style="font-size:12px;padding:7px 12px" onclick="openDlModal({artistName:'${esc(album.artistName)}',trackName:'${esc(album.collectionName)}',artworkUrl100:'${album.artworkUrl100||''}',collectionName:'${esc(album.collectionName)}',isAlbum:true,deezerData:${JSON.stringify(album).replace(/"/g,'&quot;')}})">⬇ Album laden</button>
    </div>
    <div class="search-section-title">Tracks</div>`;
    const list = document.createElement('div'); list.className = 'song-list';
    tracks.forEach((t,i) => list.appendChild(makeGlobalTrackItem(t, i, tracks)));
    s.appendChild(list);
    el.innerHTML = ''; el.appendChild(s);
  } catch(e) { toast('Fehler: ' + e.message); }
}

export function loadDeezerArtistResults(artistId, artistName, fanCount) {
  navigate('artist-detail', { id: null, name: artistName, deezerArtistId: artistId, deezerFanCount: fanCount });
}

// ─── SEARCH HELPERS ───
export function searchSimilarArtist(artistName) {
  navigate('discover');
  document.getElementById('global-search-input').value = artistName;
  onGlobalSearch(artistName);
}

export async function searchAndPreview(trackName, artistName) {
  try {
    const res = await deezerSearch(trackName+' '+artistName, 'musicTrack', 1);
    if(res[0]?.previewUrl) playPreview(res[0]); else toast('Kein Preview verfügbar');
  } catch { toast('Suche fehlgeschlagen'); }
}

// ─── NAVIGATION SHORTCUTS ───
export async function s_goArtist(e, name, id) {
  if(!name) return;
  if(id) { navigate('artist-detail', {id, name}); return; }
  try {
    const r = await api('search3', `&query=${encodeURIComponent(name)}&artistCount=5&albumCount=0&songCount=0`);
    const artists = r.searchResult3?.artist || [];
    const match = artists.find(a => a.name.toLowerCase() === name.toLowerCase()) || artists[0];
    if(match) navigate('artist-detail', {id: match.id, name: match.name});
    else toast('Künstler nicht gefunden');
  } catch { toast('Suche fehlgeschlagen'); }
}

export function s_goAlbum(e, albumId, albumName, artist, artistId) {
  if(albumId) navigate('album-detail', {id:albumId, name:albumName, artist, artistId:artistId||'', coverArt:''});
}

export function playerBarGoAlbum() {
  const s = S.queue[S.qIdx];
  if(!s) return;
  if(S.npOpen) closeNowPlaying();
  if(s.albumId) navigate('album-detail', {id:s.albumId, name:s.album||'', artist:s.artist||'', artistId:s.artistId||'', coverArt:s.coverArt||''});
}

export function playerBarGoArtist() {
  const s = S.queue[S.qIdx];
  if(!s || !s.artist) return;
  if(S.npOpen) closeNowPlaying();
  navigate('artist-detail', {id: s.artistId||s.artist, name: s.artist});
}