import { S } from './state.js';
import { esc, toast } from './utils.js';

export function loadSoundCloudImporter() {
  // Hint is managed by the unified importer input in spotify.js
}

export function clearSoundCloudPreview() {
  // no-op — handled by onImporterInput
}

export async function resolveSoundCloudLink() {
  const url = document.getElementById('sc-link-input')?.value.trim()
           || document.getElementById('importer-link-input')?.value.trim();
  if (!url) return;
  if (!url.includes('soundcloud.com')) { toast('⚠ Kein SoundCloud-Link'); return; }
  if (!S.cfg.backendUrl) { toast('⚠ Backend URL in Einstellungen konfigurieren'); return; }

  const preview = document.getElementById('sc-preview');
  const inner   = document.getElementById('sc-preview-inner');
  const section = document.getElementById('sc-tracks-section');

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

  try {
    const res = await fetch(`${S.cfg.backendUrl}/api/soundcloud/resolve`, {
      method: 'POST',
      headers: { 'Content-Type': 'application/json' },
      body: JSON.stringify({ url }),
      signal: AbortSignal.timeout(35000),
    });
    if (!res.ok) {
      const err = await res.json().catch(() => ({}));
      throw new Error(err.error || `HTTP ${res.status}`);
    }
    const data = await res.json();
    window._scResolved = data;
    _renderSoundCloudPreview(data);
  } catch(e) {
    if (e.name === 'TimeoutError' || e.name === 'AbortError') {
      inner.innerHTML = `<div style="color:var(--danger);padding:16px;background:var(--surface);border-radius:10px">Zeitüberschreitung — Backend antwortet nicht. Läuft yt-dlp?</div>`;
      return;
    }
    inner.innerHTML = `<div style="color:var(--danger);padding:16px;background:var(--surface);border-radius:10px">${esc(e.message)}</div>`;
  }
}

export function scDlAll() {
  const data = window._scResolved;
  if (!data) return;
  window.executeSpotifyDownload({
    type: 'playlist',
    title: data.name,
    artist: data.artist,
    artworkUrl: data.artworkUrl,
    tracks: data.tracks,
  });
}

export function scDlSingle() {
  const data = window._scResolved;
  if (!data?.tracks?.[0]) return;
  const t = data.tracks[0];
  window.executeSpotifyDownload({
    type: 'track',
    title: t.trackName,
    artist: t.artistName,
    artworkUrl: t.artworkUrl,
    tracks: [t],
  });
}

export function scDlTrack(idx) {
  const data = window._scResolved;
  const t = data?.tracks?.[idx];
  if (!t) return;
  window.executeSpotifyDownload({
    type: 'track',
    title: t.trackName,
    artist: t.artistName,
    artworkUrl: t.artworkUrl,
    tracks: [t],
  });
}

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

  const count = data.tracks?.length || 0;
  const art   = data.artworkUrl || '';

  let actionsHtml = '';
  if (data.type === 'track' && count > 0) {
    const t = data.tracks[0];
    actionsHtml = `
      <button class="btn-outline blue" style="font-size:13px;padding:9px 18px;font-weight:600;margin-top:2px"
        onclick="scDlSingle()">
        ⬇ Track laden
      </button>`;
  } else {
    actionsHtml = `
      <button class="btn-outline blue" style="font-size:13px;padding:9px 18px;font-weight:600;margin-top:2px"
        onclick="scDlAll()">
        ⬇ Alle ${count} Tracks laden
      </button>`;
  }

  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 #ff5500">
      <div style="width:90px;height:90px;border-radius:10px;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:#ff5500;text-transform:uppercase;letter-spacing:1.5px;margin-bottom:5px">
          SoundCloud ${data.type === 'playlist' ? 'Playlist' : 'Track'}
        </div>
        <div style="font-size:18px;font-weight:700;margin-bottom:3px;overflow:hidden;text-overflow:ellipsis;white-space:nowrap;line-height:1.2">${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 = `${count} Track${count !== 1 ? 's' : ''}`;
  list.innerHTML = '';
  (data.tracks || []).forEach((t, i) => {
    const el = document.createElement('div');
    el.className = 'gtrack-item';
    const artT = t.artworkUrl || '';
    el.innerHTML = `
      <div class="gtrack-art">${artT ? `<img src="${artT}" loading="lazy">` : '<div style="width:100%;height:100%;display:flex;align-items:center;justify-content:center;font-size:22px">🎵</div>'}</div>
      <div class="gtrack-info">
        <div class="gtrack-title">${esc(t.trackName || '—')}</div>
        <div class="gtrack-sub">${esc(t.artistName || '—')}${t.genre ? ' · ' + esc(t.genre) : ''}${t.duration ? ' · ' + Math.round(t.duration / 60) + ' min' : ''}</div>
      </div>
      <div class="gtrack-actions">
        <button class="icon-btn green" title="Herunterladen" onclick="event.stopPropagation();scDlTrack(${i})">
          <svg width="14" height="14" 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>
        </button>
      </div>`;
    list.appendChild(el);
  });
  section.style.display = '';
}