let friends = [];
let currentIndex = 0;

const STECKBRIEF_LABELS = {
  spitzname: 'Spitzname',
  geburtstag: 'Geburtstag',
  adresse: 'Adresse / Wohnort',
  lieblingsfarbe: 'Lieblingsfarbe',
  lieblingsessen: 'Lieblingsessen',
  lieblingstier: 'Lieblingstier',
  hobbys: 'Hobbys',
  lieblingsmusik: 'Lieblingsmusik',
  lieblingsfilm: 'Lieblingsfilm/-serie',
  traumberuf: 'Traumberuf',
  bestefreunde: 'Beste Freunde',
  motto: 'Motto / Lebensweisheit',
  sonstiges: 'Sonstiges',
};

function escapeHtml(str) {
  const div = document.createElement('div');
  div.textContent = str || '';
  return div.innerHTML;
}

function randomRotation(seed) {
  const angles = [-6, -4, -2, 2, 4, 6, -3, 3, 5, -5];
  return angles[seed % angles.length];
}

async function load() {
  const res = await fetch('/api/book');
  if (res.status === 401) { window.location.href = '/'; return; }
  const data = await res.json();
  friends = data.friends || [];
  if (!friends.length) {
    document.getElementById('bookRoot').innerHTML = `
      <div class="empty-book">
        <h2>Noch ist dieses Buch leer 📖</h2>
        <p class="muted">Lege im Admin-Bereich Freunde an und teile den Link mit ihnen.</p>
      </div>`;
    return;
  }
  document.getElementById('bookNav').style.display = 'flex';
  renderPage();
}

function uploadUrl(folder, filename) {
  return `/uploads/${encodeURIComponent(folder)}/${encodeURIComponent(filename)}`;
}

function renderPage() {
  const f = friends[currentIndex];
  const root = document.getElementById('bookRoot');

  const profileHtml = f.profileImage
    ? `<img class="page-profile-pic" src="${uploadUrl(f.folderName, f.profileImage)}" />`
    : `<div class="page-profile-pic placeholder">${(f.name || '?')[0].toUpperCase()}</div>`;

  const sbEntries = Object.entries(f.steckbrief || {}).filter(([, v]) => v && String(v).trim());
  const sbHtml = sbEntries.length
    ? `<div class="sb-grid">${sbEntries.map(([k, v]) => `
        <div class="sb-row"><span class="sb-key">${escapeHtml(STECKBRIEF_LABELS[k] || k)}</span><span class="sb-val">${escapeHtml(v)}</span></div>
      `).join('')}</div>`
    : `<p class="muted">Noch nichts eingetragen.</p>`;

  const blocks = [...(f.blocks || [])].sort((a, b) => a.order - b.order);
  const blocksHtml = blocks.length
    ? blocks.map((b, i) => {
        const rot = randomRotation(i + f.id.length);
        if (b.type === 'image') {
          return `<div class="scrap-item polaroid" style="transform: rotate(${rot}deg);">
            <img src="${uploadUrl(f.folderName, b.filename)}" />
            ${b.caption ? `<div class="scrap-caption">${escapeHtml(b.caption)}</div>` : ''}
          </div>`;
        }
        if (b.type === 'audio') {
          return `<div class="scrap-item audio-note" style="transform: rotate(${rot * 0.5}deg);">
            <div>🎙️ ${b.caption ? escapeHtml(b.caption) : 'Sprachnachricht'}</div>
            <audio controls src="${uploadUrl(f.folderName, b.filename)}"></audio>
          </div>`;
        }
        return `<div class="scrap-item text-note" style="transform: rotate(${rot * 0.5}deg);">
          <p>${escapeHtml(b.content).replace(/\n/g, '<br/>')}</p>
          ${b.caption ? `<div class="scrap-caption">${escapeHtml(b.caption)}</div>` : ''}
        </div>`;
      }).join('')
    : '<p class="muted">Noch keine Erinnerungen hinzugefügt.</p>';

  root.innerHTML = `
    <div class="friend-page">
      <div class="page-head">
        <div class="tape"></div>
        ${profileHtml}
        <h1>${escapeHtml(f.name)}</h1>
      </div>
      <div class="steckbrief-card">
        <h2>Steckbrief</h2>
        ${sbHtml}
      </div>
      <div class="scrap-grid">
        ${blocksHtml}
      </div>
    </div>
  `;

  document.getElementById('pageIndicator').textContent = `Seite ${currentIndex + 1} von ${friends.length}`;
  document.getElementById('prevBtn').disabled = currentIndex === 0;
  document.getElementById('nextBtn').disabled = currentIndex === friends.length - 1;
}

document.getElementById('prevBtn').addEventListener('click', () => {
  if (currentIndex > 0) { currentIndex--; renderPage(); window.scrollTo({ top: 0, behavior: 'smooth' }); }
});
document.getElementById('nextBtn').addEventListener('click', () => {
  if (currentIndex < friends.length - 1) { currentIndex++; renderPage(); window.scrollTo({ top: 0, behavior: 'smooth' }); }
});
document.addEventListener('keydown', (e) => {
  if (e.key === 'ArrowLeft') document.getElementById('prevBtn').click();
  if (e.key === 'ArrowRight') document.getElementById('nextBtn').click();
});

document.getElementById('pdfBtn').addEventListener('click', async () => {
  const btn = document.getElementById('pdfBtn');
  btn.disabled = true;
  btn.textContent = 'Erzeuge PDF...';
  try {
    const res = await fetch('/api/book/pdf');
    if (!res.ok) throw new Error('PDF-Export fehlgeschlagen.');
    const blob = await res.blob();
    const url = URL.createObjectURL(blob);
    const a = document.createElement('a');
    a.href = url;
    a.download = 'freundesbuch.pdf';
    document.body.appendChild(a);
    a.click();
    a.remove();
    URL.revokeObjectURL(url);
  } catch (err) {
    alert(err.message);
  } finally {
    btn.disabled = false;
    btn.textContent = '⬇️ Als PDF exportieren';
  }
});

load();