const API = '';

function escapeHtml(text) {
  if (text == null) return '';
  return String(text)
    .replace(/&/g, '&')
    .replace(/</g, '&lt;')
    .replace(/>/g, '&gt;')
    .replace(/"/g, '&quot;');
}

function formatApiError(detail) {
  if (!detail) return null;
  if (typeof detail === 'string') return detail;
  if (Array.isArray(detail)) {
    return detail.map((d) => (d && d.msg) || JSON.stringify(d)).join('; ');
  }
  return String(detail);
}

async function ddaApi(method, path, options = {}) {
  const headers = { ...options.headers };
  if (options.body && !(options.body instanceof FormData)) {
    headers['Content-Type'] = 'application/json';
  }
  const res = await fetch(API + path, { method, headers, credentials: 'include', ...options });
  const text = await res.text();
  let data = null;
  try { data = text ? JSON.parse(text) : null; } catch (_) {}
  if (!res.ok) throw new Error(formatApiError(data?.detail) || res.statusText || 'Request failed');
  return data;
}

function showDdaError(msg) {
  const el = document.getElementById('dda-error');
  if (!el) return;
  el.textContent = msg;
  el.classList.remove('hidden');
}
function hideDdaError() {
  document.getElementById('dda-error')?.classList.add('hidden');
}
function showDdaSuccess(msg) {
  const el = document.getElementById('dda-success');
  if (!el) return;
  el.textContent = msg;
  el.classList.remove('hidden');
  setTimeout(() => el.classList.add('hidden'), 4000);
}

function formatBytes(n) {
  if (n >= 1024 ** 3) return (n / 1024 ** 3).toFixed(1) + ' GB';
  if (n >= 1024 ** 2) return (n / 1024 ** 2).toFixed(1) + ' MB';
  return (n / 1024).toFixed(0) + ' KB';
}

let ddaConfig = null;
const selectedNode = { id: null, path: '' };

window.ddaState = {
  get config() { return ddaConfig; },
  get localCfg() { return window._localCfg; },
  get selectedNode() { return { ...selectedNode }; },
  get userRole() { return window._ddaUserRole || 'analyst'; },
  set userRole(r) { window._ddaUserRole = r; },
  setNode(n) { selectedNode.id = n.id; selectedNode.path = n.path || ''; },
  clearNode() { selectedNode.id = null; selectedNode.path = ''; },
  refreshImages: () => loadLibraryImages(),
  rescan: () => rescanLibrary(),
};

document.querySelectorAll('.dda-tab').forEach((btn) => {
  btn.addEventListener('click', () => {
    document.querySelectorAll('.dda-tab').forEach((b) => b.classList.remove('active'));
    document.querySelectorAll('.dda-panel').forEach((p) => p.classList.remove('active'));
    btn.classList.add('active');
    const tab = btn.dataset.tab;
    document.getElementById('tab-' + tab)?.classList.add('active');
    if (tab === 'detect' && typeof loadCompareLibraryGrid === 'function') {
      loadCompareLibraryGrid();
    }
  });
});

async function rescanLibrary() {
  const data = await ddaApi('POST', '/api/dda/local/rescan');
  if (typeof renderAllTrees === 'function') renderAllTrees({ tree: data.tree }, []);
  else if (typeof renderTree === 'function') renderTree({ tree: data.tree }, []);
  if (typeof populateManageNodeSelect === 'function') populateManageNodeSelect();
  await loadLibraryImages();
  if (typeof loadCompareLibraryGrid === 'function') await loadCompareLibraryGrid();
  return data;
}

async function initDda() {
  hideDdaError();
  try {
    try {
      const me = await ddaApi('GET', '/api/dda/me');
      window.ddaState.userRole = me.role || 'analyst';
    } catch (_) {
      window.ddaState.userRole = 'analyst';
    }

    ddaConfig = await ddaApi('GET', '/api/dda/config');
    const localCfg = await ddaApi('GET', '/api/dda/local/config');
    window._localCfg = localCfg;

    document.getElementById('btn-manage-library')?.classList.toggle('hidden', window.ddaState.userRole !== 'admin');

    const hint = document.getElementById('lib-config-hint');
    if (hint) hint.textContent = localCfg.geotiffEnabled ? 'GeoTIFF ready' : 'GeoTIFF limited';

    const pathEl = document.getElementById('lib-path-display');
    if (pathEl) {
      pathEl.textContent = [
        'Storage root:',
        localCfg.storageRoot || localCfg.writablePath || '',
        'Layout: {zone}/{area}/…/Images/file.tif',
      ].filter(Boolean).join('\n');
    }

    const folderPath = document.getElementById('lib-folder-path');
    if (folderPath) {
      folderPath.textContent = localCfg.isHosted
        ? 'Hugging Face — tree library'
        : `Storage: ${localCfg.storageRoot || ''}`;
    }

    const instr = document.getElementById('lib-instructions');
    if (instr && localCfg.instructions) instr.textContent = localCfg.instructions;

    const uploadLimit = document.getElementById('upload-limit-hint');
    if (uploadLimit && localCfg.maxUploadGb) {
      uploadLimit.textContent = `Select a tree node and image type. Max ${localCfg.maxUploadGb} GB per file.`;
    }

    const resHint = document.getElementById('dda-detect-res-hint');
    if (resHint && localCfg.detectionMaxSide) {
      resHint.textContent = `Detection runs at up to ${localCfg.detectionMaxSide}px per side.`;
    }

    const urlTab = new URLSearchParams(window.location.search).get('tab');
    if (urlTab) document.querySelector(`.dda-tab[data-tab="${urlTab}"]`)?.click();

    if (typeof loadTree === 'function') await loadTree();
    await loadLibraryImages();
  } catch (err) {
    showDdaError(err.message || 'Failed to load library');
  }
}

function selectionTitle() {
  return selectedNode.path || 'All images';
}

async function loadLibraryImages() {
  const grid = document.getElementById('lib-grid');
  const title = document.getElementById('lib-grid-title');
  if (!grid) return;
  const q = document.getElementById('lib-filter')?.value?.trim() || '';
  const params = new URLSearchParams();
  if (selectedNode.id) params.set('node_id', String(selectedNode.id));
  if (q) params.set('q', q);
  if (title) title.textContent = `Images — ${selectionTitle()}`;

  try {
    const items = await ddaApi('GET', '/api/dda/local/images?' + params.toString());
    window.ddaState.libraryItems = items;
    if (!items.length) {
      grid.innerHTML = `<p class="dim">No images in <strong>${escapeHtml(selectionTitle())}</strong>. Select a node and upload, or use Manage to create folders.</p>`;
      return;
    }
    grid.innerHTML = items.map((img) => {
      const thumb = img.thumbUrl || '';
      const crumb = img.breadcrumb || img.nodePath || img.filename;
      return `
      <div class="dda-card-img" draggable="true" data-image-path="${img.path.replace(/"/g, '&quot;')}" title="${escapeHtml(img.filename)}">
        ${thumb ? `<img src="${thumb}" alt="" loading="lazy" />` : '<div class="meta">No preview</div>'}
        <div class="meta">
          <span class="dim dda-crumb">${escapeHtml(crumb)}</span><br/>
          <span class="dim">${img.imageType || ''} · ${formatBytes(img.fileSizeBytes)}</span>
        </div>
      </div>`;
    }).join('');
    grid.querySelectorAll('.dda-card-img').forEach((card) => {
      card.addEventListener('dragstart', (e) => {
        e.dataTransfer.setData('application/x-dda-image-path', card.dataset.imagePath);
        e.dataTransfer.setData('text/plain', card.dataset.imagePath);
      });
    });
    if (typeof loadCompareLibraryGrid === 'function') loadCompareLibraryGrid();
  } catch (err) {
    grid.innerHTML = `<p class="dim">Could not load images: ${err.message}</p>`;
  }
}

document.getElementById('lib-filter')?.addEventListener('input', () => {
  clearTimeout(window._libFilterTimer);
  window._libFilterTimer = setTimeout(loadLibraryImages, 300);
});

document.getElementById('btn-refresh-lib')?.addEventListener('click', async () => {
  const btn = document.getElementById('btn-refresh-lib');
  btn.disabled = true;
  try {
    const data = await rescanLibrary();
    const sync = data.sync || {};
    const parts = [`${data.totalImages || 0} image(s)`];
    if (sync.nodesCreated) parts.push(`${sync.nodesCreated} folder(s) imported`);
    if (sync.imagesIndexed) parts.push(`${sync.imagesIndexed} image(s) indexed`);
    showDdaSuccess(`Library synced — ${parts.join(', ')}.`);
  } catch (err) {
    showDdaError(err.message);
  } finally {
    btn.disabled = false;
  }
});

initDda();