import { S } from './state.js';
import { esc, toast } from './utils.js';
import { itunesSearch } from './api.js';
// Circular imports — safe (only used inside function bodies)
import { makeGlobalTrackItem } from './components.js';
import { openDlModal } from './ui.js';

// ─── SPOTIFY IMPORTER PAGE ───
export function loadSpotifyImporter() {
  if (!document.getElementById('spotify-link-input')?.value) {
    const hint    = document.getElementById('spotify-importer-hint');
    const preview = document.getElementById('spotify-preview');
    if (hint)    hint.style.display    = '';
    if (preview) preview.style.display = 'none';
  }
}

export function clearSpotifyPreview() {
  if (!document.getElementById('spotify-link-input')?.value) {
    const hint    = document.getElementById('spotify-importer-hint');
    const preview = document.getElementById('spotify-preview');
    if (hint)    hint.style.display    = '';
    if (preview) preview.style.display = 'none';
  }
}

export async function resolveSpotifyLink() {
  const url = document.getElementById('spotify-link-input')?.value.trim();
  if (!url) return;
  if (!S.cfg.backendUrl) { toast('⚠ Backend URL in Einstellungen konfigurieren'); return; }

  const hint    = document.getElementById('spotify-importer-hint');
  const preview = document.getElementById('spotify-preview');
  const inner   = document.getElementById('spotify-preview-inner');
  const section = document.getElementById('spotify-tracks-section');

  if (hint)    hint.style.display    = 'none';
  preview.style.display = '';
  section.style.display = 'none';
  inner.innerHTML = '<div class="spinner"></div>';

  try {
    const res = await fetch(`${S.cfg.backendUrl}/api/spotify/resolve`, {
      method: 'POST',
      headers: { 'Content-Type': 'application/json' },
      body: JSON.stringify({ url }),
      signal: AbortSignal.timeout(30000),
    });
    if (!res.ok) {
      const err = await res.json().catch(() => ({}));
      if (err.error === 'EDITORIAL_PLAYLIST') throw new Error('EDITORIAL_PLAYLIST');
      if (err.error === 'RATE_LIMITED') throw new Error(`RATE_LIMITED:${err.retryAfter || 30}`);
      throw new Error(err.error || err.message || `HTTP ${res.status}`);
    }
    const data = await res.json();
    window._spotifyResolved = data;
    if (data.skippedLocal > 0) toast(`${data.skippedLocal} lokale Datei(en) übersprungen (kein Stream verfügbar)`);
    _renderSpotifyPreview(data);
  } catch(e) {
    if (e.name === 'TimeoutError' || e.name === 'AbortError') {
      inner.innerHTML = `<div style="color:var(--danger);padding:16px;background:var(--surface);border-radius:10px">Zeitüberschreitung — der Server hat nicht rechtzeitig geantwortet. Läuft das Backend?</div>`;
      return;
    }
    if (e.message.startsWith('RATE_LIMITED:')) {
      const secs = parseInt(e.message.split(':')[1], 10) || 30;
      _startRateLimitCountdown(inner, secs);
      return;
    }
    if (e.message === 'EDITORIAL_PLAYLIST') {
      inner.innerHTML = `<div style="padding:16px;background:var(--surface);border-radius:10px;border-left:3px solid #1DB954">
        <div style="font-weight:600;margin-bottom:10px;color:#1DB954">💡 Editorial Playlist erkannt</div>
        <div style="font-size:13px;line-height:1.6;color:var(--text2)">
          Spotify hat den API-Zugriff auf eigene kuratierte Playlists
          (wie "Today's Top Hits", "Discover Weekly" etc.) für Drittanbieter-Apps gesperrt.<br><br>
          <strong style="color:var(--text)">Lösung:</strong>
          <ol style="margin:8px 0 0 0;padding-left:20px">
            <li>In Spotify die Playlist öffnen</li>
            <li>Alle Tracks markieren (Strg+A)</li>
            <li>Rechtsklick → "Zu Playlist hinzufügen" → "Neue Playlist"</li>
            <li>Diese eigene Kopie hier importieren</li>
          </ol>
        </div>
      </div>`;
      return;
    }
    inner.innerHTML = `<div style="color:var(--danger);padding:16px;background:var(--surface);border-radius:10px">${esc(e.message)}</div>`;
  }
}

export function spotifyDlAll(cbId, nameId) {
  const data = window._spotifyResolved;
  if (!data) return;
  window.executeSpotifyDownload({
    type: 'playlist',
    title: document.getElementById(nameId)?.value || data.name,
    artist: data.artist,
    artworkUrl: data.artworkUrl,
    tracks: data.tracks,
    createPlaylist: document.getElementById(cbId)?.checked || false,
    playlistName: document.getElementById(nameId)?.value || data.name,
  });
}

function _renderSpotifyPreview(data) {
  const inner   = document.getElementById('spotify-preview-inner');
  const section = document.getElementById('spotify-tracks-section');
  const list    = document.getElementById('spotify-tracks-list');
  const titleEl = document.getElementById('spotify-tracks-title');

  const typeLabel = { track: 'Spotify Track', album: 'Spotify Album', playlist: 'Spotify Playlist' }[data.type] || 'Spotify';
  const art = (data.artworkUrl || '').replace(/\/\d+x\d+bb/, '/300x300bb').replace('100x100', '300x300');
  const count = data.tracks?.length || 0;
  const uid = Date.now();
  const plCbId = `sp-cb-${uid}`, plNmId = `sp-pln-${uid}`;

  let actionsHtml = '';
  if (data.type === 'track' && count > 0) {
    actionsHtml = `
      <div style="display:flex;gap:8px;flex-wrap:wrap;margin-top:2px">
        <button class="btn-outline blue" style="font-size:13px;padding:9px 18px;font-weight:600"
          onclick="executeSpotifyDownload({type:'track',title:window._spotifyResolved.tracks[0].trackName,artist:window._spotifyResolved.tracks[0].artistName,artworkUrl:window._spotifyResolved.artworkUrl,tracks:window._spotifyResolved.tracks})">
          ⬇ Track laden
        </button>
        ${data.tracks[0]?.collectionName ? `<button class="btn-outline" style="font-size:12px;padding:9px 14px"
          onclick="openDlModal({artistName:window._spotifyResolved.tracks[0].artistName,trackName:window._spotifyResolved.tracks[0].collectionName,collectionName:window._spotifyResolved.tracks[0].collectionName,artworkUrl100:window._spotifyResolved.tracks[0].artworkUrl100||window._spotifyResolved.artworkUrl||'',isAlbum:true})">
          💿 ${esc(data.tracks[0].collectionName)}
        </button>` : ''}
      </div>`;
  } else if (data.type === 'album') {
    actionsHtml = `
      <button class="btn-outline blue" style="font-size:13px;padding:9px 18px;font-weight:600;margin-top:2px"
        onclick="executeSpotifyDownload({type:'playlist',title:window._spotifyResolved.name,artist:window._spotifyResolved.artist,artworkUrl:window._spotifyResolved.artworkUrl,tracks:window._spotifyResolved.tracks})">
        ⬇ Album laden (${count} Tracks)
      </button>`;
  } else if (data.type === 'playlist') {
    actionsHtml = `
      <div style="margin-top:6px">
        <label id="${plCbId}_label" style="display:inline-flex;align-items:center;gap:8px;font-size:12px;cursor:pointer;margin-bottom:10px;background:var(--surface2);border:1px solid var(--border2);border-radius:20px;padding:6px 12px;transition:border-color .2s" onclick="void(0)">
          <input type="checkbox" id="${plCbId}" style="width:14px;height:14px;accent-color:#1DB954;cursor:pointer" onchange="
            document.getElementById('${plCbId}_wrap').style.display=this.checked?'':'none';
            document.getElementById('${plCbId}_label').style.borderColor=this.checked?'#1DB954':'';
            document.getElementById('${plCbId}_label').style.color=this.checked?'#1DB954':'';
          ">
          <svg width="12" height="12" viewBox="0 0 24 24" fill="none" stroke="currentColor" stroke-width="2"><path d="M9 18V5l12-2v13"/><circle cx="6" cy="18" r="3"/><circle cx="18" cy="16" r="3"/></svg>
          Als Navidrome-Playlist speichern
        </label>
        <div id="${plCbId}_wrap" style="display:none;margin-bottom:10px">
          <input type="text" id="${plNmId}" value="${esc(data.name)}" placeholder="Playlist-Name…"
            style="background:var(--surface2);border:1px solid var(--border2);border-radius:8px;padding:8px 12px;font-size:13px;width:100%;box-sizing:border-box;color:var(--text);outline:none">
        </div>
        <button class="btn-outline blue" style="font-size:13px;padding:9px 18px;font-weight:600"
          onclick="spotifyDlAll('${plCbId}','${plNmId}')">
          ⬇ Alle ${count} Tracks laden
        </button>
      </div>`;
  }

  const artSize = data.type === 'playlist' ? '80px' : '110px';
  const artRadius = data.type === 'playlist' ? '8px' : '10px';
  const artHtml = art
    ? `<img src="${art}" style="width:100%;height:100%;object-fit:cover" onerror="this.style.display='none';this.nextElementSibling.style.display='flex'">`
    : '';

  inner.innerHTML = `
    <div style="display:flex;gap:16px;align-items:flex-start;background:var(--surface);border-radius:14px;padding:18px 16px;margin-bottom:4px;border:1px solid var(--border);border-top:3px solid #1DB954">
      <div style="width:${artSize};height:${artSize};border-radius:${artRadius};overflow:hidden;flex-shrink:0;background:var(--surface2);position:relative">
        ${artHtml}
        <div style="width:100%;height:100%;display:${art?'none':'flex'};align-items:center;justify-content:center;font-size:32px;position:absolute;top:0;left:0">🎵</div>
      </div>
      <div style="flex:1;min-width:0">
        <div style="font-size:10px;font-weight:700;color:#1DB954;text-transform:uppercase;letter-spacing:1.5px;margin-bottom:5px;display:flex;align-items:center;gap:5px">
          <svg width="10" height="10" viewBox="0 0 24 24" fill="#1DB954"><circle cx="12" cy="12" r="10"/><path d="M8 11.973c2.5-1.473 5.5-.973 7.5.527M9.5 14.473c1.5-.973 3.5-.973 5 .027M7 9c3-1.5 6.5-1 9 1" stroke="#000" stroke-width="2" fill="none"/></svg>
          ${typeLabel}
        </div>
        <div style="font-size:18px;font-weight:700;margin-bottom:3px;overflow:hidden;text-overflow:ellipsis;white-space:nowrap;line-height:1.2">${esc(data.name)}</div>
        <div style="font-size:13px;color:var(--text2);margin-bottom:10px">${esc(data.artist)}${count > 1 ? `<span style="color:var(--text3)"> · ${count} Tracks</span>` : ''}</div>
        ${actionsHtml}
      </div>
    </div>`;

  titleEl.textContent = `${count} Tracks`;
  list.innerHTML = '';
  (data.tracks || []).forEach((t, i) => list.appendChild(makeGlobalTrackItem(t, i, data.tracks)));
  section.style.display = '';

  // Lazy-load correct per-track artwork via iTunes in the background
  if ((data.type === 'playlist' || data.type === 'album') && count > 0 && S.cfg.backendUrl) {
    _loadSpotifyTrackArtwork(data.tracks, list);
  }
}

function _setEnrichStatus(done, current, total) {
  const el = document.getElementById('spotify-enrich-status');
  if (!el) return;
  if (done) {
    el.className = 'done';
    el.innerHTML = '<svg width="13" height="13" viewBox="0 0 24 24" fill="none" stroke="currentColor" stroke-width="2.5"><polyline points="20 6 9 17 4 12"/></svg> iTunes-Daten geladen';
    el.style.display = 'flex';
    el.style.opacity = '1';
    setTimeout(() => {
      el.style.opacity = '0';
      setTimeout(() => { el.style.display = 'none'; el.className = ''; }, 400);
    }, 2000);
  } else {
    el.className = '';
    el.innerHTML = `<div class="enrich-spinner"></div> Lade iTunes-Daten… (${current}/${total})`;
    el.style.display = 'flex';
    el.style.opacity = '1';
  }
}

async function _loadSpotifyTrackArtwork(tracks, listEl) {
  const artEls = listEl.querySelectorAll('.gtrack-art');

  // Show any Spotify artwork that's already present immediately
  tracks.forEach((t, i) => {
    const url = t.artworkUrl100 || t.artworkUrl60 || '';
    if (!url) return;
    const el = artEls[i];
    if (!el) return;
    _setArt(el, url);
  });

  // Enrich each track with iTunes data — same call as global search
  const CONC = 4;
  let enriched = 0;
  _setEnrichStatus(false, 0, tracks.length);
  for (let i = 0; i < tracks.length; i += CONC) {
    const batch = tracks.slice(i, i + CONC);
    await Promise.all(batch.map(async (t, bi) => {
      const idx = i + bi;
      try {
        const firstArtist = (t.artistName || '').split(/\s*[,/•]\s*/)[0].trim();
        const results = await itunesSearch(`${t.trackName} ${firstArtist}`, 'musicTrack', 1);
        const match = results[0];
        if (!match) return;
        // Enrich track object so downloads get correct metadata
        if (match.artworkUrl100)      t.artworkUrl100      = match.artworkUrl100;
        if (match.collectionName)     t.collectionName     = match.collectionName;
        if (match.releaseDate)        t.releaseDate        = match.releaseDate;
        if (match.trackNumber)        t.trackNumber        = match.trackNumber;
        if (match.trackExplicitness)  t.trackExplicitness  = match.trackExplicitness;
        if (match.previewUrl)         t.previewUrl         = match.previewUrl;
        if (match.trackTimeMillis)    t.durationMs         = match.trackTimeMillis;
        if (window._spotifyResolved?.tracks?.[idx]) Object.assign(window._spotifyResolved.tracks[idx], t);
        const url = match.artworkUrl100 || match.artworkUrl60 || '';
        if (url) _setArt(artEls[idx], url);
        if (match.previewUrl) {
          const item = artEls[idx]?.closest('.gtrack-item');
          if (item && !item.querySelector('.gtrack-actions .icon-btn.blue')) {
            const actions = item.querySelector('.gtrack-actions');
            if (actions) {
              const btn = document.createElement('button');
              btn.className = 'icon-btn blue';
              btn.title = '30s Preview';
              btn.innerHTML = '<svg width="14" height="14" viewBox="0 0 24 24" fill="currentColor"><polygon points="5 3 19 12 5 21 5 3"/></svg>';
              btn.onclick = (e) => { e.stopPropagation(); window.playPreview(t); };
              actions.insertBefore(btn, actions.firstChild);
              item.onclick = () => window.playPreview(t);
            }
          }
        }
      } catch { /* non-critical */ }
      enriched++;
      _setEnrichStatus(false, enriched, tracks.length);
    }));
  }
  _setEnrichStatus(true);
}

function _startRateLimitCountdown(inner, totalSecs) {
  const endMs = Date.now() + totalSecs * 1000;
  const render = (remaining) => {
    const s = Math.max(0, Math.ceil(remaining / 1000));
    const label = s >= 60 ? `${Math.ceil(s / 60)} Min.` : `${s}s`;
    inner.innerHTML = `<div style="color:var(--text);padding:16px;background:var(--surface);border-radius:10px;border-left:3px solid var(--warning,#f59e0b)">
      <div style="font-weight:600;margin-bottom:6px">⏳ Spotify Rate Limit</div>
      <div style="font-size:13px;line-height:1.5;color:var(--text2)">
        Bitte warte noch <strong id="sp-rl-countdown">${label}</strong> — nicht erneut versuchen, das setzt den Timer zurück.
      </div>
    </div>`;
  };
  render(totalSecs * 1000);
  const iv = setInterval(() => {
    const remaining = endMs - Date.now();
    if (remaining <= 0) { clearInterval(iv); render(0); return; }
    render(remaining);
  }, 1000);
}

function _setArt(el, url) {
  if (!el) return;
  const img = document.createElement('img');
  img.loading = 'lazy';
  img.onerror = () => { el.innerHTML = '<div style="width:100%;height:100%;display:flex;align-items:center;justify-content:center;font-size:22px">🎵</div>'; };
  img.src = url;
  el.innerHTML = ''; el.appendChild(img);
}