/*
 * photo.js
 * Photo upload for all entity types and the mobile Photo Queue feature.
 *
 * Photo upload:
 *   triggerPhoto(type, id) — opens the hidden file input, sets _photoTarget.
 *   The 'change' handler uploads via multipart POST, updates the tree node,
 *   and on mobile automatically runs the full AI pipeline for books
 *   (POST /api/books/{id}/process).
 *
 * Photo Queue (mobile-only UI):
 *   collectQueueBooks(node, type) — collects all non-approved books in tree
 *     order (top-to-bottom within each shelf, left-to-right across shelves).
 *   renderPhotoQueue() — updates the #photo-queue-overlay DOM in-place.
 *   Queue flow: show spine → tap camera → upload + process → auto-advance.
 *   Queue is stored in _photoQueue (state.js) so events.js can control it.
 *
 * Depends on: S, _photoQueue (state.js); req, toast (api.js / helpers.js);
 *             walkTree, findNode, esc (tree-render.js / helpers.js);
 *             isDesktop, render (helpers.js / init.js)
 * Provides: collectQueueBooks(), renderPhotoQueue(), triggerPhoto()
 */

/* exported collectQueueBooks, renderPhotoQueue, triggerPhoto */

// ── Photo Queue ──────────────────────────────────────────────────────────────
function collectQueueBooks(node, type) {
  const books = [];
  function collect(n, t) {
    if (t === 'book') {
      if (n.identification_status !== 'user_approved') books.push(n);
      return;
    }
    if (t === 'room') n.cabinets.forEach((c) => collect(c, 'cabinet'));
    if (t === 'cabinet') n.shelves.forEach((s) => collect(s, 'shelf'));
    if (t === 'shelf') n.books.forEach((b) => collect(b, 'book'));
  }
  collect(node, type);
  return books;
}

function renderPhotoQueue() {
  const el = document.getElementById('photo-queue-overlay');
  if (!el) return;
  if (!_photoQueue) {
    el.style.display = 'none';
    el.innerHTML = '';
    return;
  }
  const { books, index, processing } = _photoQueue;
  el.style.display = 'flex';
  if (index >= books.length) {
    el.innerHTML = `<div class="pq-hdr">
      <button class="hbtn" data-a="photo-queue-close">✕</button>
      <span class="pq-hdr-title">Photo Queue</span>
      <span style="min-width:34px"></span>
    </div>
    <div class="pq-spine-wrap" style="text-align:center">
      <div style="font-size:3rem">✓</div>
      <div style="font-size:1.1rem;color:#86efac;font-weight:600">All done!</div>
      <div style="font-size:.82rem;color:#94a3b8;margin-top:4px">All ${books.length} book${books.length !== 1 ? 's' : ''} photographed</div>
      <button class="btn btn-p" style="margin-top:20px" data-a="photo-queue-close">Close</button>
    </div>`;
    return;
  }
  const book = books[index];
  el.innerHTML = `<div class="pq-hdr">
    <button class="hbtn" data-a="photo-queue-close">✕</button>
    <span class="pq-hdr-title">${index + 1} / ${books.length}</span>
    <span style="min-width:34px"></span>
  </div>
  <div class="pq-spine-wrap">
    <img class="pq-spine-img" src="/api/books/${book.id}/spine?t=${Date.now()}" alt="Spine"
         onerror="this.style.display='none'">
    <div class="pq-book-name">${esc(book.title || '—')}</div>
  </div>
  <div class="pq-actions">
    <button class="pq-skip-btn" data-a="photo-queue-skip">Skip</button>
    <button class="pq-camera-btn" data-a="photo-queue-take">📷</button>
  </div>
  ${processing ? '<div class="pq-processing"><div class="spinner"></div><span>Processing…</span></div>' : ''}`;
}

// ── Photo upload ─────────────────────────────────────────────────────────────
const gphoto = document.getElementById('gphoto');

function triggerPhoto(type, id) {
  S._photoTarget = { type, id };
  if (/Android|iPhone|iPad/i.test(navigator.userAgent)) gphoto.setAttribute('capture', 'environment');
  else gphoto.removeAttribute('capture');
  gphoto.value = '';
  gphoto.click();
}

gphoto.addEventListener('change', async () => {
  const file = gphoto.files[0];
  if (!file || !S._photoTarget) return;
  const { type, id } = S._photoTarget;
  S._photoTarget = null;
  const fd = new FormData();
  fd.append('image', file, file.name); // HD — no client-side compression
  const urls = {
    room: `/api/rooms/${id}/photo`,
    cabinet: `/api/cabinets/${id}/photo`,
    shelf: `/api/shelves/${id}/photo`,
    book: `/api/books/${id}/photo`,
  };
  try {
    const res = await req('POST', urls[type], fd, true);
    const key = type === 'book' ? 'image_filename' : 'photo_filename';
    walkTree((n) => {
      if (n.id === id) n[key] = res[key];
    });
    // Photo queue mode: process and advance without full re-render
    if (_photoQueue && type === 'book') {
      _photoQueue.processing = true;
      renderPhotoQueue();
      const book = findNode(id);
      if (book && book.identification_status !== 'user_approved') {
        try {
          const br = await req('POST', `/api/books/${id}/process`);
          walkTree((n) => {
            if (n.id === id) Object.assign(n, br);
          });
        } catch {
          /* continue queue on process error */
        }
      }
      _photoQueue.processing = false;
      _photoQueue.index++;
      renderPhotoQueue();
      return;
    }
    render();
    // Mobile: auto-queue AI after photo upload (books only)
    if (!isDesktop()) {
      if (type === 'book') {
        const book = findNode(id);
        if (book && book.identification_status !== 'user_approved') {
          try {
            const br = await req('POST', `/api/books/${id}/process`);
            walkTree((n) => {
              if (n.id === id) Object.assign(n, br);
            });
            toast(`Photo saved · Identified (${br.identification_status})`);
            render();
          } catch {
            toast('Photo saved');
          }
        } else {
          toast('Photo saved');
        }
      } else {
        toast('Photo saved');
      }
    } else {
      toast('Photo saved');
    }
  } catch (err) {
    toast('Upload failed: ' + err.message);
  }
});