// public/js/icon-picker.js
(function () {
  let ALL_ICONS = [];
  let _targetInput = null;

  // ── Init: inject modal + fetch icons ──────────────────────────────────────
  function init() {
    _injectModal();
    _fetchIcons();
    _bindSearch();
  }

  function _injectModal() {
    if (document.getElementById('iconPickerModal')) return; // tránh inject 2 lần

    document.body.insertAdjacentHTML('beforeend', `
      <div class="modal fade" id="iconPickerModal" tabindex="-1">
        <div class="modal-dialog modal-lg">
          <div class="modal-content">
            <div class="modal-header">
              <h5 class="modal-title"><i class="fas fa-icons me-2"></i>Choose an Icon</h5>
              <button type="button" class="btn-close" data-bs-dismiss="modal"></button>
            </div>
            <div class="modal-body">
              <input type="text" class="form-control mb-3" id="iconSearchInput" placeholder="Search icons... (e.g. phone, mail)">
              <div id="iconPickerStatus" class="text-muted small mb-2"></div>
              <div id="iconGrid" class="d-flex flex-wrap gap-2"></div>
            </div>
          </div>
        </div>
      </div>
    `);
  }

  async function _fetchIcons() {
    try {
      const res = await fetch('/js/fa-icons.json');
      if (!res.ok) throw new Error('HTTP ' + res.status);
      const json = await res.json();

      const POPULAR_ORDER = [
        // Education
        'fa-solid fa-graduation-cap', 'fa-solid fa-book', 'fa-solid fa-book-open',
        'fa-solid fa-chalkboard-teacher', 'fa-solid fa-school', 'fa-solid fa-university',
        'fa-solid fa-pencil', 'fa-solid fa-certificate', 'fa-solid fa-award',
        'fa-solid fa-medal',

        // Finance
        'fa-solid fa-piggy-bank', 'fa-solid fa-dollar-sign', 'fa-solid fa-credit-card',
        'fa-solid fa-wallet', 'fa-solid fa-hand-holding-dollar', 'fa-solid fa-coins',
        'fa-solid fa-chart-line', 'fa-solid fa-receipt', 'fa-solid fa-building-columns',
        'fa-solid fa-landmark',

        // Social / Contact
        'fa-solid fa-users', 'fa-solid fa-user-group', 'fa-solid fa-handshake',
        'fa-solid fa-comments', 'fa-solid fa-phone', 'fa-solid fa-envelope',
        'fa-solid fa-globe', 'fa-solid fa-location-dot', 'fa-solid fa-building',
        'fa-solid fa-headset',

        // Social Media
        'fa-brands fa-facebook', 'fa-brands fa-instagram', 'fa-brands fa-youtube',
        'fa-brands fa-linkedin', 'fa-brands fa-twitter', 'fa-brands fa-tiktok',
        'fa-brands fa-whatsapp', 'fa-brands fa-telegram',
      ];

      ALL_ICONS = Object.entries(json).flatMap(([name, meta]) =>
        (meta.styles || [])
          .filter(s => ['solid', 'regular', 'brands'].includes(s))
          .map(style => ({
            value: `fa-${style} fa-${name}`,
            label: meta.label || name,
          }))
      );

      ALL_ICONS.sort((a, b) => {
        const ai = POPULAR_ORDER.indexOf(a.value);
        const bi = POPULAR_ORDER.indexOf(b.value);
        if (ai === -1 && bi === -1) return 0;
        if (ai === -1) return 1;
        if (bi === -1) return -1;
        return ai - bi;
      });

      console.log('[IconPicker] loaded:', ALL_ICONS.length, 'icons');
    } catch (err) {
      console.error('[IconPicker] fetch failed:', err);
    }
  }

  function _bindSearch() {
    document.addEventListener('input', function (e) {
      if (e.target.id !== 'iconSearchInput') return;
      const q = e.target.value.toLowerCase().trim();
      const filtered = q
        ? ALL_ICONS.filter(i => i.label.toLowerCase().includes(q) || i.value.includes(q))
        : ALL_ICONS;
      console.log('[IconPicker] search:', q, '→', filtered.length);
      _renderGrid(filtered);
    });
  }

  // ── Public: open picker ───────────────────────────────────────────────────
  function open(inputEl) {
    _targetInput = inputEl;
    document.getElementById('iconSearchInput').value = '';

    if (!ALL_ICONS.length) {
      _setStatus('Loading icons...');
      _renderGrid([]);
    } else {
      _setStatus('');
      _renderGrid(ALL_ICONS);
    }

    const modal = new bootstrap.Modal(document.getElementById('iconPickerModal'));
    modal.show();

    document.getElementById('iconPickerModal').addEventListener('shown.bs.modal', function handler() {
      document.getElementById('iconSearchInput').focus();
      this.removeEventListener('shown.bs.modal', handler);
    });
  }

  function _renderGrid(icons) {

    const grid = document.getElementById('iconGrid');
    grid.style.visibility = 'hidden';
    if (!icons.length) {
      grid.innerHTML = '<p class="text-muted small">No icons found.</p>';
      return;
    }

    _setStatus(`Showing ${Math.min(icons.length, 200)} / ${icons.length}`);
    grid.innerHTML = icons.slice(0, 200).map(icon => `
      <button type="button"
        class="btn btn-outline-secondary d-flex flex-column align-items-center justify-content-center gap-1"
        style="width:80px;height:72px;font-size:11px"
        onclick="IconPickerPick('${_esc(icon.value)}')"
        title="${_esc(icon.label)}">
        <i class="${icon.value}" style="font-size:1.4rem"></i>
        <span class="text-truncate w-100 text-center">${icon.label}</span>
      </button>
    `).join('');

    document.fonts.ready.then(() => {
      grid.style.visibility = 'visible';
    });
  }

  function iconPickerInput(cssClass, currentValue) {
    return (
      '<div class="input-group">' +
      '<span class="input-group-text icon-preview-cell" style="min-width:38px">' +
      (currentValue ? '<i class="' + escHtml(currentValue) + '"></i>' : '') +
      '</span>' +
      '<input type="text" class="form-control ' + cssClass + '" value="' + escHtml(currentValue) + '" ' +
      'placeholder="Click to pick..." readonly style="cursor:pointer;background:#fff" onclick="IconPicker.open(this)">' +
      '</div>'
    );
  }

  function pick(value) {
    if (!_targetInput) return;
    _targetInput.value = value;

    // Update preview nếu có
    const previewCell = _targetInput.closest('.input-group')?.querySelector('.icon-preview-cell');
    if (previewCell) previewCell.innerHTML = `<i class="${value}"></i>`;

    bootstrap.Modal.getInstance(document.getElementById('iconPickerModal')).hide();
    console.log('[IconPicker] picked:', value);
  }

  function _setStatus(msg) {
    const el = document.getElementById('iconPickerStatus');
    if (el) el.textContent = msg;
  }

  function _esc(val) {
    return String(val || '').replace(/"/g, '&quot;').replace(/</g, '&lt;').replace(/>/g, '&gt;');
  }

  // ── Expose global ─────────────────────────────────────────────────────────
  window.IconPicker = { init, open, pick };
  window.IconPicker = { init, open, pick, inputHtml: iconPickerInput };
  window.IconPicker.pick = pick;
  window.IconPickerPick = pick;
})();