// ═══════════════════════════════════════════════════════════
// MNEMOSYNE — Memory Inspect Panel  (issue #1227)
// ═══════════════════════════════════════════════════════════
//
// Side-panel detail view for memory crystals.
// Opens when a crystal is clicked; auto-closes on empty-space click.
//
// Usage from app.js:
//   MemoryInspect.init({ onNavigate: fn });
//   MemoryInspect.show(memData, regionDef);
//   MemoryInspect.hide();
//   MemoryInspect.isOpen();
// ═══════════════════════════════════════════════════════════

const MemoryInspect = (() => {
  let _panel = null;
  let _onNavigate = null;   // callback(memId) — navigate to a linked memory

  // ─── INIT ────────────────────────────────────────────────
  function init(opts = {}) {
    _onNavigate = opts.onNavigate || null;
    _panel = document.getElementById('memory-inspect-panel');
    if (!_panel) {
      console.warn('[MemoryInspect] Panel element #memory-inspect-panel not found in DOM');
    }
  }

  // ─── SHOW ────────────────────────────────────────────────
  function show(data, regionDef) {
    if (!_panel) return;

    const region = regionDef || {};
    const colorHex = region.color
      ? '#' + region.color.toString(16).padStart(6, '0')
      : '#4af0c0';
    const strength = data.strength != null ? data.strength : 0.7;
    const vitality = Math.round(Math.max(0, Math.min(1, strength)) * 100);

    let vitalityColor = '#4af0c0';
    if (vitality < 30) vitalityColor = '#ff4466';
    else if (vitality < 60) vitalityColor = '#ffaa22';

    const ts = data.timestamp ? new Date(data.timestamp) : null;
    const created = ts && !isNaN(ts) ? ts.toLocaleString() : '—';

    // Linked memories
    let linksHtml = '';
    if (data.connections && data.connections.length > 0) {
      linksHtml = data.connections
        .map(id => `<button class="mi-link-btn" data-memid="${_esc(id)}">${_esc(id)}</button>`)
        .join('');
    } else {
      linksHtml = '<span class="mi-empty">No linked memories</span>';
    }

    _panel.innerHTML = `
      <div class="mi-header" style="border-left:3px solid ${colorHex}">
        <span class="mi-region-glyph">${region.glyph || '\u25C8'}</span>
        <div class="mi-header-text">
          <div class="mi-id" title="${_esc(data.id || '')}">${_esc(_truncate(data.id || '\u2014', 28))}</div>
          <div class="mi-region" style="color:${colorHex}">${_esc(region.label || data.category || '\u2014')}</div>
        </div>
        <button class="mi-close" id="mi-close-btn" aria-label="Close inspect panel">\u2715</button>
      </div>
      <div class="mi-body">
        <div class="mi-section">
          <div class="mi-section-label">CONTENT</div>
          <div class="mi-content">${_esc(data.content || '(empty)')}</div>
        </div>
        <div class="mi-section">
          <div class="mi-section-label">VITALITY</div>
          <div class="mi-vitality-row">
            <div class="mi-vitality-bar-track">
              <div class="mi-vitality-bar" style="width:${vitality}%;background:${vitalityColor}"></div>
            </div>
            <span class="mi-vitality-pct" style="color:${vitalityColor}">${vitality}%</span>
          </div>
        </div>
        <div class="mi-section">
          <div class="mi-section-label">LINKED MEMORIES</div>
          <div class="mi-links" id="mi-links">${linksHtml}</div>
        </div>
        <div class="mi-section">
          <div class="mi-section-label">META</div>
          <div class="mi-meta-row">
            <span class="mi-meta-key">Source</span>
            <span class="mi-meta-val">${_esc(data.source || '\u2014')}</span>
          </div>
          <div class="mi-meta-row">
            <span class="mi-meta-key">Created</span>
            <span class="mi-meta-val">${created}</span>
          </div>
        </div>
        <div class="mi-actions">
          <button class="mi-action-btn" id="mi-copy-btn">\u2398 Copy</button>
        </div>
      </div>
    `;

    // Wire close button
    const closeBtn = _panel.querySelector('#mi-close-btn');
    if (closeBtn) closeBtn.addEventListener('click', hide);

    // Wire copy button
    const copyBtn = _panel.querySelector('#mi-copy-btn');
    if (copyBtn) {
      copyBtn.addEventListener('click', () => {
        const text = data.content || '';
        if (navigator.clipboard) {
          navigator.clipboard.writeText(text).then(() => {
            copyBtn.textContent = '\u2713 Copied';
            setTimeout(() => { copyBtn.textContent = '\u2398 Copy'; }, 1500);
          }).catch(() => _fallbackCopy(text));
        } else {
          _fallbackCopy(text);
        }
      });
    }

    // Wire link navigation
    const linksContainer = _panel.querySelector('#mi-links');
    if (linksContainer) {
      linksContainer.addEventListener('click', (e) => {
        const btn = e.target.closest('.mi-link-btn');
        if (btn && _onNavigate) _onNavigate(btn.dataset.memid);
      });
    }

    _panel.style.display = 'flex';
    // Trigger CSS animation
    requestAnimationFrame(() => _panel.classList.add('mi-visible'));
  }

  // ─── HIDE ─────────────────────────────────────────────────
  function hide() {
    if (!_panel) return;
    _panel.classList.remove('mi-visible');
    // Wait for CSS transition before hiding
    const onEnd = () => {
      _panel.style.display = 'none';
      _panel.removeEventListener('transitionend', onEnd);
    };
    _panel.addEventListener('transitionend', onEnd);
    // Safety fallback if transition doesn't fire
    setTimeout(() => { if (_panel) _panel.style.display = 'none'; }, 350);
  }

  // ─── QUERY ────────────────────────────────────────────────
  function isOpen() {
    return _panel != null && _panel.style.display !== 'none';
  }

  // ─── HELPERS ──────────────────────────────────────────────
  function _esc(str) {
    return String(str)
      .replace(/&/g, '&amp;')
      .replace(/</g, '&lt;')
      .replace(/>/g, '&gt;')
      .replace(/"/g, '&quot;');
  }

  function _truncate(str, n) {
    return str.length > n ? str.slice(0, n - 1) + '\u2026' : str;
  }

  function _fallbackCopy(text) {
    const ta = document.createElement('textarea');
    ta.value = text;
    ta.style.position = 'fixed';
    ta.style.left = '-9999px';
    document.body.appendChild(ta);
    ta.select();
    document.execCommand('copy');
    document.body.removeChild(ta);
  }

  return { init, show, hide, isOpen };
})();

export { MemoryInspect };