/**
 * Server Tunnels page — renders the server table, manages bulk selection,
 * and wires up start/stop/edit modal events.
 * Depends on: core/utils.js ($, escapeHtml, truncate), ui/toast.js (showToast, copyToClipboard),
 *             ui/modal.js (openModal, closeModal, showModalError)
 */

function _updateServerBulkBar() {
  const checked = document.querySelectorAll('#swarmsTable input[type="checkbox"]:checked');
  const bar = $('serverBulkBar');
  const countEl = $('serverBulkCount');
  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 server tunnels table with the latest state.
 * @param {object} state - Full extension state from `fetchState()`.
 */
function updateSwarmsTable(state) {
  const tbody = $('swarmsTable');
  if (!tbody) return;
  const servers = state.servers || [];

  if (servers.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"><rect x="2" y="3" width="6" height="6" rx="1"/><rect x="16" y="3" width="6" height="6" rx="1"/><rect x="9" y="15" width="6" height="6" rx="1"/><line x1="5" y1="9" x2="12" y2="15"/><line x1="19" y1="9" x2="12" y2="15"/></svg>
          <div class="empty-state-title">No server tunnels</div>
          <div class="empty-state-desc">Click "New Server" to expose a local port as an hs:// tunnel</div>
        </div>
      </td></tr>`;
    _updateServerBulkBar();
    return;
  }

  tbody.innerHTML = servers.map(s => {
    const id = s.id || s.serverId || '';
    const url = s.url || s.hsUrl || '';
    const safeId = id.replace(/"/g, '&quot;');
    const label = s.label || '';
    return `
      <tr>
        <td style="width:32px;"><input type="checkbox" class="server-row-cb" data-server-id="${safeId}"></td>
        <td>
          ${label ? `<div style="font-weight:600;color:var(--text);margin-bottom:2px;">${escapeHtml(label)}</div>` : ''}
          <div class="mono" style="font-size:11px;color:var(--text3);">${escapeHtml(truncate(id, 20))}</div>
        </td>
        <td style="font-weight:600;color:var(--text);">${s.port ?? '—'}</td>
        <td>
          <div style="display:flex;align-items:center;gap:6px;">
            <span class="mono" title="${escapeHtml(url)}" style="font-size:11px;color:var(--cyan);">${truncate(url, 30)}</span>
            ${url ? `<button class="btn-icon copy-btn" data-copy="${escapeHtml(url)}" title="Copy hs:// URL">
              <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>
          <span class="badge badge-neutral" style="margin-right:4px;">${s.udp ? 'UDP' : 'TCP'}</span>${s.secure ? `<span class="badge badge-green">secure</span>` : `<span class="badge badge-neutral">plain</span>`}
        </td>
        <td>
          <div style="display:flex;align-items:center;gap:6px;">
            <button class="btn btn-ghost btn-sm" data-edit-server="${safeId}" title="Edit server">
              <svg viewBox="0 0 24 24" fill="none" stroke="currentColor" stroke-width="2"><path d="M11 4H4a2 2 0 0 0-2 2v14a2 2 0 0 0 2 2h14a2 2 0 0 0 2-2v-7"/><path d="M18.5 2.5a2.121 2.121 0 0 1 3 3L12 15l-4 1 1-4 9.5-9.5z"/></svg>
              Edit
            </button>
            <button class="btn btn-danger btn-sm" data-stop-server="${safeId}">
              <svg viewBox="0 0 24 24" fill="none" stroke="currentColor" stroke-width="2"><rect x="3" y="3" width="18" height="18" rx="2"/></svg>
              Stop
            </button>
          </div>
        </td>
      </tr>`;
  }).join('');

  tbody.querySelectorAll('.server-row-cb').forEach(cb => {
    cb.addEventListener('change', _updateServerBulkBar);
  });

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

  tbody.querySelectorAll('[data-edit-server]').forEach(btn => {
    btn.addEventListener('click', () => {
      const serverId = btn.dataset.editServer;
      const server = (state.servers || []).find(s => (s.id || s.serverId) === serverId);
      if (!server) return;
      const serverEditIdEl = $('serverEditId');
      if (serverEditIdEl) serverEditIdEl.value = serverId;
      const labelEl = $('startServerLabel');
      const portEl = $('startServerPort');
      const hostEl = $('startServerHost');
      const secureEl = $('startServerSecure');
      if (labelEl) labelEl.value = server.label || '';
      if (portEl) portEl.value = server.port ?? 3000;
      if (hostEl) hostEl.value = server.host ?? '127.0.0.1';
      if (secureEl) secureEl.checked = server.secure !== false;
      const udpEl = document.querySelector('input[name="startServerProtocol"][value="' + (server.udp ? 'udp' : 'tcp') + '"]');
      if (udpEl) udpEl.checked = true;
      const titleEl = $('modal-startServer-title');
      if (titleEl) titleEl.textContent = 'Edit Server Tunnel';
      const submitEl = $('startServerSubmit');
      if (submitEl) submitEl.textContent = 'Save Changes';
      openModal('modal-startServer');
    });
  });

  tbody.querySelectorAll('[data-stop-server]').forEach(btn => {
    btn.addEventListener('click', () => {
      const serverId = btn.dataset.stopServer;
      const nameEl = $('stopServerName');
      if (nameEl) nameEl.textContent = serverId;
      $('stopServerConfirm').dataset.serverId = serverId;
      openModal('modal-stopServer');
    });
  });

  _updateServerBulkBar();
}

/**
 * Attach all event listeners for the Server Tunnels page.
 * Called once during dashboard initialisation.
 */
function setupServerEvents() {
  $('serverSelectAll')?.addEventListener('change', (e) => {
    document.querySelectorAll('#swarmsTable .server-row-cb').forEach(cb => { cb.checked = e.target.checked; });
    _updateServerBulkBar();
  });

  $('btnServerBulkStop')?.addEventListener('click', () => {
    const checked = Array.from(document.querySelectorAll('#swarmsTable .server-row-cb:checked'));
    if (!checked.length) return;
    const ids = checked.map(cb => cb.dataset.serverId);
    if (!confirm('Stop ' + ids.length + ' server(s)?')) return;
    let done = 0;
    for (const serverId of ids) {
      chrome.runtime.sendMessage(
        { target: 'holesail-native', action: 'send', payload: { type: 'stopServer', payload: { serverId } } },
        () => { done++; if (done === ids.length) { showToast(ids.length + ' server(s) stopped', 'success'); refresh(); } }
      );
    }
  });

  $('startServerBtn')?.addEventListener('click', () => {
    const editIdEl = $('serverEditId');
    if (editIdEl) editIdEl.value = '';
    const labelEl = $('startServerLabel');
    if (labelEl) labelEl.value = '';
    const portEl = $('startServerPort');
    if (portEl) portEl.value = '3000';
    const hostEl = $('startServerHost');
    if (hostEl) hostEl.value = '127.0.0.1';
    const secureEl = $('startServerSecure');
    if (secureEl) secureEl.checked = true;
    const tcpEl = $('startServerProtocolTcp');
    if (tcpEl) tcpEl.checked = true;
    const titleEl = $('modal-startServer-title');
    if (titleEl) titleEl.textContent = 'Start Server Tunnel';
    const submitEl = $('startServerSubmit');
    if (submitEl) submitEl.textContent = 'Start Server';
    openModal('modal-startServer');
  });

  $('startServerSubmit')?.addEventListener('click', () => {
    const portEl = $('startServerPort');
    const hostEl = $('startServerHost');
    const secureEl = $('startServerSecure');
    const labelEl = $('startServerLabel');
    const editIdEl = $('serverEditId');
    const port = parseInt(portEl?.value, 10) || 3000;
    const host = (hostEl?.value || '127.0.0.1').trim();
    const secure = secureEl?.checked !== false;
    const udp = document.querySelector('input[name="startServerProtocol"]:checked')?.value === 'udp';
    const label = (labelEl?.value || '').trim();
    const editId = (editIdEl?.value || '').trim();
    if (!port || port < 1 || port > 65535) { showModalError('modal-startServer', 'startServerError', 'Port must be 1–65535'); return; }
    const btn = $('startServerSubmit');
    if (btn) { btn.disabled = true; btn.textContent = editId ? 'Saving…' : 'Starting…'; }

    const doStart = () => {
      chrome.runtime.sendMessage(
        { target: 'holesail-native', action: 'send', payload: { type: 'startServer', payload: { port, host, secure, udp, label } } },
        (response) => {
          if (btn) { btn.disabled = false; btn.textContent = editId ? 'Save Changes' : 'Start Server'; }
          if (response?.ok) {
            if (editIdEl) editIdEl.value = '';
            closeModal('modal-startServer');
            showToast(editId ? 'Server updated' : 'Server started', 'success');
            refresh();
          } else {
            showModalError('modal-startServer', 'startServerError', response?.error || 'Failed to start');
          }
        }
      );
    };

    if (editId) {
      chrome.runtime.sendMessage(
        { target: 'holesail-native', action: 'send', payload: { type: 'stopServer', payload: { serverId: editId } } },
        () => doStart()
      );
    } else {
      doStart();
    }
  });

  $('stopServerConfirm')?.addEventListener('click', () => {
    const serverId = $('stopServerConfirm').dataset.serverId;
    if (!serverId) return;
    const btn = $('stopServerConfirm');
    btn.disabled = true; btn.textContent = 'Stopping…';
    chrome.runtime.sendMessage(
      { target: 'holesail-native', action: 'send', payload: { type: 'stopServer', payload: { serverId } } },
      (response) => {
        btn.disabled = false; btn.textContent = 'Stop Server';
        closeModal('modal-stopServer');
        if (response?.ok) showToast('Server stopped', 'success');
        else showToast(response?.error || 'Failed to stop', 'error');
        refresh();
      }
    );
  });
}