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

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

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

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

  try {
    const res = await fetch(`${S.cfg.backendUrl}/api/youtube/resolve`, {
      method: 'POST',
      headers: { 'Content-Type': 'application/json' },
      body: JSON.stringify({ url }),
      signal: AbortSignal.timeout(50000),
    });
    if (!res.ok) {
      const err = await res.json().catch(() => ({}));
      throw new Error(err.error || `HTTP ${res.status}`);
    }
    const data = await res.json();
    window._ytResolved = data;
    _renderYouTubePreview(data);
  } catch (e) {
    if (e.name === 'TimeoutError' || e.name === 'AbortError') {
      inner.innerHTML = `<div style="color:var(--danger);padding:16px;background:var(--surface);border-radius:10px">Zeitüberschreitung — yt-dlp hat nicht rechtzeitig geantwortet.</div>`;
      return;
    }
    inner.innerHTML = `<div style="color:var(--danger);padding:16px;background:var(--surface);border-radius:10px">${esc(e.message)}</div>`;
  }
}

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

  const typeLabel = data.type === 'playlist' ? 'YouTube Playlist' : 'YouTube';
  const YT_RED = '#FF0000';
  const art = (data.artworkUrl || '').replace(/\/hqdefault\.jpg/, '/maxresdefault.jpg');
  const count = data.tracks?.length || 0;

  let actionsHtml = '';
  if (data.type === 'track' && count > 0) {
    actionsHtml = `
      <button class="btn-outline blue" style="font-size:13px;padding:9px 18px;font-weight:600;margin-top:2px"
        onclick="executeYouTubeDownload({type:'track',title:window._ytResolved.tracks[0].trackName,artist:window._ytResolved.tracks[0].artistName,artworkUrl:window._ytResolved.artworkUrl,tracks:window._ytResolved.tracks})">
        ⬇ Track laden
      </button>`;
  } else if (data.type === 'playlist') {
    actionsHtml = `
      <button class="btn-outline blue" style="font-size:13px;padding:9px 18px;font-weight:600;margin-top:2px"
        onclick="executeYouTubeDownload({type:'playlist',title:window._ytResolved.name,artist:window._ytResolved.artist,artworkUrl:window._ytResolved.artworkUrl,tracks:window._ytResolved.tracks})">
        ⬇ Alle ${count} Tracks laden
      </button>`;
  }

  const artHtml = art
    ? `<img src="${art}" style="width:100%;height:100%;object-fit:cover" onerror="this.style.display='none'">`
    : '';

  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 ${YT_RED}">
      <div style="width:110px;height:110px;border-radius:10px;overflow:hidden;flex-shrink:0;background:var(--surface2)">
        ${artHtml}
        <div style="width:100%;height:100%;display:${art?'none':'flex'};align-items:center;justify-content:center;font-size:32px">▶</div>
      </div>
      <div style="flex:1;min-width:0">
        <div style="font-size:10px;font-weight:700;color:${YT_RED};text-transform:uppercase;letter-spacing:1.5px;margin-bottom:5px">
          ${typeLabel}
        </div>
        <div style="font-size:18px;font-weight:700;margin-bottom:3px;overflow:hidden;text-overflow:ellipsis;white-space:nowrap">${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>`;

  if (count > 0) {
    titleEl.textContent = `${count} Tracks`;
    list.innerHTML = '';
    (data.tracks || []).forEach((t, i) => list.appendChild(makeGlobalTrackItem(t, i, data.tracks)));
    section.style.display = '';
  }
}

export function executeYouTubeDownload(opts) {
  if (!S.cfg.backendUrl) { toast('⚠ Kein Backend konfiguriert'); return; }
  window.executeSpotifyDownload(opts);
}