/**
 * Service Tunnels page — renders the service tunnels table, manages bulk selection,
 * and wires up add/edit/remove modal events.
 * Depends on: core/utils.js ($, escapeHtml, truncate), ui/state-tag.js (stateTag),
 *             ui/toast.js (showToast, copyToClipboard), ui/modal.js (openModal, closeModal, showModalError)
 */

function _updateSvcBulkBar() {
  const checked = document.querySelectorAll('#serviceTunnelsTable input[type="checkbox"]:checked');
  const bar = $('svcBulkBar');
  const countEl = $('svcBulkCount');
  if (!bar) return;
  if (checked.length > 0) {
    bar.style.display = 'flex';
    if (countEl) countEl.textContent = checked.length + ' selected';
  } else {
    bar.style.display = 'none';
  }
}

/**
 * Re-render the service tunnels table with the latest state.
 * @param {object} state - Full extension state from `fetchState()`.
 */
function updateServiceTunnelsTable(state) {
  const tbody = $('serviceTunnelsTable');
  if (!tbody) return;
  const tunnels = state.serviceTunnels || [];

  const countEl = $('serviceTunnelCount');
  if (countEl) countEl.textContent = tunnels.length;

  // Snapshot latency badge values before re-render so they survive the innerHTML swap
  const _latencySnapshot = {};
  tbody.querySelectorAll('.latency-badge[data-ping-port]').forEach(b => {
    _latencySnapshot[b.dataset.pingHost + ':' + b.dataset.pingPort] = { text: b.textContent, color: b.style.color };
  });

  // Snapshot checked checkboxes so selection survives the innerHTML swap
  const _checkedTunnelIds = new Set();
  tbody.querySelectorAll('.svc-row-cb:checked').forEach(cb => _checkedTunnelIds.add(cb.dataset.tunnelId));

  if (tunnels.length === 0) {
    tbody.innerHTML = `
      <tr><td colspan="6">
        <div class="empty-state">
          <svg viewBox="0 0 24 24" fill="none" stroke="currentColor" stroke-width="1.5"><path d="M12 2L2 7l10 5 10-5-10-5z"/><path d="M2 17l10 5 10-5"/><path d="M2 12l10 5 10-5"/></svg>
          <div class="empty-state-title">No service tunnels</div>
          <div class="empty-state-desc">Forward a remote hs:// peer to a local TCP port (e.g. database, API).</div>
          <button type="button" class="btn btn-primary empty-state-btn" data-open-modal="modal-addServiceTunnel">Add your first service tunnel</button>
        </div>
      </td></tr>`;
    _updateSvcBulkBar();
    return;
  }

  tbody.innerHTML = tunnels.map(t => {
    const id = t.id || '';
    const label = t.label || id;
    const hsUrl = t.hsUrl || '';
    const localAddr = t.localPort != null ? `127.0.0.1:${t.localPort}` : '—';
    const safeId = id.replace(/"/g, '&quot;');
    return `
      <tr>
        <td style="width:32px;"><input type="checkbox" class="svc-row-cb" data-tunnel-id="${safeId}"></td>
        <td style="font-weight:600;color:var(--text);">${escapeHtml(label)}</td>
        <td>
          <div style="display:flex;align-items:center;gap:6px;">
            <span class="mono" title="${escapeHtml(hsUrl)}" style="font-size:11px;color:var(--text3);">${truncate(hsUrl, 28)}</span>
            ${hsUrl ? `<button class="btn-icon copy-btn" data-copy="${escapeHtml(hsUrl)}" title="Copy hs:// key">
              <svg viewBox="0 0 24 24" fill="none" stroke="currentColor" stroke-width="2"><rect x="9" y="9" width="13" height="13" rx="2"/><path d="M5 15H4a2 2 0 0 1-2-2V4a2 2 0 0 1 2-2h9a2 2 0 0 1 2 2v1"/></svg>
              <span class="copy-tooltip">Copied!</span>
            </button>` : ''}
          </div>
        </td>
        <td>
          <div style="display:flex;align-items:center;gap:6px;">
            <span style="font-weight:600;color:var(--cyan);font-family:'JetBrains Mono',monospace;font-size:13px;">${escapeHtml(localAddr)}</span>
            ${t.localPort != null ? `<button class="btn-icon copy-btn" data-copy="${escapeHtml(localAddr)}" title="Copy local address">
              <svg viewBox="0 0 24 24" fill="none" stroke="currentColor" stroke-width="2"><rect x="9" y="9" width="13" height="13" rx="2"/><path d="M5 15H4a2 2 0 0 1-2-2V4a2 2 0 0 1 2-2h9a2 2 0 0 1 2 2v1"/></svg>
              <span class="copy-tooltip">Copied!</span>
            </button>` : ''}
          </div>
        </td>
        <td>
          ${stateTag(t.state)}
          ${t.localPort != null && settings.latencyPingEnabled !== false ? `<span class="latency-badge" data-ping-host="127.0.0.1" data-ping-port="${t.localPort}" style="margin-left:4px;font-size:10px;color:var(--text4);">…ms</span>` : ''}
        </td>
        <td>
          <div style="display:flex;align-items:center;gap:6px;">
            ${(t.state === 'error' || t.state === 'closed') ? `
            <button class="btn btn-ghost btn-sm" data-reconnect-svc="${safeId}" data-hsurl="${escapeHtml(hsUrl)}" data-label="${escapeHtml(label)}" data-localport="${t.localPort != null ? t.localPort : ''}">
              <svg viewBox="0 0 24 24" fill="none" stroke="currentColor" stroke-width="2"><polyline points="23,4 23,10 17,10"/><path d="M20.49 15a9 9 0 1 1-2.12-9.36L23 10"/></svg>
              Reconnect
            </button>` : ''}
            <button class="btn btn-ghost btn-sm" data-edit-service-tunnel="${safeId}" title="Edit tunnel">
              <svg viewBox="0 0 24 24" fill="none" stroke="currentColor" stroke-width="2"><path d="M11 4H4a2 2 0 0 0-2 2v14a2 2 0 0 0 2 2h14a2 2 0 0 0 2-2v-7"/><path d="M18.5 2.5a2.121 2.121 0 0 1 3 3L12 15l-4 1 1-4 9.5-9.5z"/></svg>
              Edit
            </button>
            <button class="btn btn-danger btn-sm" data-remove-service-tunnel="${safeId}">
              <svg viewBox="0 0 24 24" fill="none" stroke="currentColor" stroke-width="2"><polyline points="3,6 5,6 21,6"/><path d="M19,6l-1,14a2,2,0,0,1-2,2H8a2,2,0,0,1-2-2L5,6"/></svg>
              Remove
            </button>
          </div>
        </td>
      </tr>`;
  }).join('');

  // Restore latency badge values immediately so there's no flash back to "…ms"
  tbody.querySelectorAll('.latency-badge[data-ping-port]').forEach(b => {
    const snap = _latencySnapshot[b.dataset.pingHost + ':' + b.dataset.pingPort];
    if (snap && snap.text && snap.text !== '…ms') {
      b.textContent = snap.text;
      b.style.color = snap.color;
    }
  });

  tbody.querySelectorAll('.svc-row-cb').forEach(cb => {
    if (_checkedTunnelIds.has(cb.dataset.tunnelId)) cb.checked = true;
    cb.addEventListener('change', _updateSvcBulkBar);
  });

  tbody.querySelectorAll('[data-copy]').forEach(btn => {
    btn.addEventListener('click', () => copyToClipboard(btn.dataset.copy, btn));
  });

  tbody.querySelectorAll('[data-reconnect-svc]').forEach(btn => {
    btn.addEventListener('click', () => {
      const tunnelId = btn.dataset.reconnectSvc;
      const hsUrl    = btn.dataset.hsurl;
      const label    = btn.dataset.label;
      const localPort = parseInt(btn.dataset.localport, 10);
      btn.disabled = true;
      btn.textContent = 'Reconnecting…';
      chrome.runtime.sendMessage(
        { target: 'holesail-native', action: 'send', payload: { type: 'updateServiceTunnel', payload: { tunnelId, hsUrl, label, localPort } } },
        (response) => {
          if (chrome.runtime.lastError) { showToast('Reconnect failed: ' + chrome.runtime.lastError.message, 'error'); return; }
          if (response?.ok) {
            showToast('Service tunnel reconnecting…', 'success');
          } else {
            showToast(response?.error || 'Reconnect failed', 'error');
          }
          refresh();
        }
      );
    });
  });

  tbody.querySelectorAll('[data-edit-service-tunnel]').forEach(btn => {
    btn.addEventListener('click', () => {
      const tunnelId = btn.dataset.editServiceTunnel;
      const tunnel = (state.serviceTunnels || []).find(t => t.id === tunnelId);
      if (!tunnel) return;
      $('serviceTunnelEditId').value = tunnelId;
      $('serviceTunnelLabel').value = tunnel.label || '';
      $('serviceTunnelHsUrl').value = tunnel.hsUrl || '';
      $('serviceTunnelLocalPort').value = tunnel.localPort != null ? tunnel.localPort : '';
      const titleEl = $('modal-addServiceTunnel-title');
      if (titleEl) titleEl.textContent = 'Edit Service Tunnel';
      const submitEl = $('serviceTunnelSubmit');
      if (submitEl) submitEl.textContent = 'Save';
      openModal('modal-addServiceTunnel');
    });
  });

  tbody.querySelectorAll('[data-remove-service-tunnel]').forEach(btn => {
    btn.addEventListener('click', () => {
      const tunnelId = btn.dataset.removeServiceTunnel;
      const tunnel = (state.serviceTunnels || []).find(t => t.id === tunnelId);
      const nameEl = $('removeServiceTunnelName');
      if (nameEl) nameEl.textContent = (tunnel && tunnel.label) || tunnelId;
      $('removeServiceTunnelConfirm').dataset.tunnelId = tunnelId;
      openModal('modal-removeServiceTunnel');
    });
  });

  _updateSvcBulkBar();
}

/**
 * Attach all event listeners for the Service Tunnels page.
 * Called once during dashboard initialisation.
 */
function setupServiceTunnelEvents() {
  $('svcSelectAll')?.addEventListener('change', (e) => {
    document.querySelectorAll('#serviceTunnelsTable .svc-row-cb').forEach(cb => { cb.checked = e.target.checked; });
    _updateSvcBulkBar();
  });

  $('btnSvcBulkRemove')?.addEventListener('click', () => {
    const checked = Array.from(document.querySelectorAll('#serviceTunnelsTable .svc-row-cb:checked'));
    if (!checked.length) return;
    const ids = checked.map(cb => cb.dataset.tunnelId);
    if (!confirm('Remove ' + ids.length + ' service tunnel(s)?')) return;
    let done = 0;
    for (const tunnelId of ids) {
      chrome.runtime.sendMessage(
        { target: 'holesail-native', action: 'send', payload: { type: 'stopServiceTunnel', payload: { tunnelId } } },
        () => { done++; if (done === ids.length) { showToast(ids.length + ' tunnel(s) removed', 'success'); refresh(); } }
      );
    }
  });

  $('addServiceTunnelBtn')?.addEventListener('click', () => {
    $('serviceTunnelEditId').value = '';
    $('serviceTunnelLabel').value = '';
    $('serviceTunnelHsUrl').value = '';
    $('serviceTunnelLocalPort').value = '';
    const titleEl = $('modal-addServiceTunnel-title');
    if (titleEl) titleEl.textContent = 'Add Service Tunnel';
    const submitEl = $('serviceTunnelSubmit');
    if (submitEl) submitEl.textContent = 'Connect';
    openModal('modal-addServiceTunnel');
  });

  $('serviceTunnelSubmit')?.addEventListener('click', () => {
    const label = ($('serviceTunnelLabel')?.value || '').trim();
    const hsUrl = ($('serviceTunnelHsUrl')?.value || '').trim();
    const localPort = parseInt($('serviceTunnelLocalPort')?.value, 10);
    const editId = ($('serviceTunnelEditId')?.value || '').trim();

    if (!label) { showModalError('modal-addServiceTunnel', 'serviceTunnelError', 'Label is required'); return; }
    if (!hsUrl || !hsUrl.startsWith('hs://')) { showModalError('modal-addServiceTunnel', 'serviceTunnelError', 'Enter a valid hs:// key'); return; }
    if (!localPort || localPort < 1 || localPort > 65535) { showModalError('modal-addServiceTunnel', 'serviceTunnelError', 'Local port must be 1–65535'); return; }

    const btn = $('serviceTunnelSubmit');
    if (btn) { btn.disabled = true; btn.textContent = 'Connecting…'; }

    const type = editId ? 'updateServiceTunnel' : 'startServiceTunnel';
    const payload = editId ? { tunnelId: editId, label, hsUrl, localPort } : { label, hsUrl, localPort };

    chrome.runtime.sendMessage(
      { target: 'holesail-native', action: 'send', payload: { type, payload } },
      (response) => {
        if (btn) { btn.disabled = false; btn.textContent = editId ? 'Save' : 'Connect'; }
        if (response?.ok) {
          closeModal('modal-addServiceTunnel');
          showToast(editId ? 'Tunnel updated' : 'Service tunnel connected', 'success');
          refresh();
        } else {
          showModalError('modal-addServiceTunnel', 'serviceTunnelError', response?.error || 'Failed to connect');
        }
      }
    );
  });

  $('removeServiceTunnelConfirm')?.addEventListener('click', () => {
    const tunnelId = $('removeServiceTunnelConfirm').dataset.tunnelId;
    if (!tunnelId) return;
    const btn = $('removeServiceTunnelConfirm');
    btn.disabled = true; btn.textContent = 'Removing…';
    chrome.runtime.sendMessage(
      { target: 'holesail-native', action: 'send', payload: { type: 'stopServiceTunnel', payload: { tunnelId } } },
      (response) => {
        btn.disabled = false; btn.textContent = 'Remove';
        closeModal('modal-removeServiceTunnel');
        if (response?.ok) showToast('Service tunnel removed', 'success');
        else showToast(response?.error || 'Failed to remove', 'error');
        refresh();
      }
    );
  });
}