/**
 * DHCP Lease Manager — client-side logic.
 * Uses Zoraxy's $.cjax() for CSRF-safe AJAX (jQuery available from parent frame).
 */

// ---------------------------------------------------------------------------
// Helpers
// ---------------------------------------------------------------------------

function showToast(message, type) {
  var toast = document.getElementById('toast');
  toast.textContent = message;
  toast.className = 'toast ' + (type || '');
  void toast.offsetWidth;
  toast.classList.remove('hidden');
  setTimeout(function () { toast.classList.add('hidden'); }, 3000);
}

// ---------------------------------------------------------------------------
// Render
// ---------------------------------------------------------------------------

function renderLeases(data) {
  var tbody = document.getElementById('leases-body');
  var leases = data.leases || [];

  document.getElementById('active-count').textContent = data.active_count;
  document.getElementById('pinned-count').textContent = data.pinned_count;

  if (leases.length === 0) {
    tbody.innerHTML = '<tr class="loading-row"><td colspan="5">No active leases</td></tr>';
    return;
  }

  var rows = leases.map(function (lease) {
    var isPermanent = lease.status === 'permanent';
    var hasHostname = lease.hostname && lease.hostname.trim() !== '';
    return (
      '<tr>' +
        '<td>' + esc(lease.hostname || '--') + '</td>' +
        '<td>' + esc(lease.ip) + '</td>' +
        '<td class="mac-address">' + esc(lease.mac) + '</td>' +
        '<td>' +
          '<span class="status-badge ' + (isPermanent ? 'status-permanent' : 'status-active') + '">' +
            esc(lease.status) +
          '</span>' +
        '</td>' +
        '<td class="actions-cell" data-mac="' + escAttr(lease.mac) + '" data-ip="' + escAttr(lease.ip) + '" data-hostname="' + escAttr(lease.hostname || '') + '">' +
          (isPermanent
            ? '<button class="btn edit-btn" data-action="edit">Edit</button>' +
              '<button class="btn btn-danger" data-action="unpin">Unpin</button>' +
              '<span class="edit-form" style="display:none">' +
                '<input type="text" class="edit-hostname" placeholder="hostname" size="16" value="' + escAttr(lease.hostname || '') + '">' +
                '<button class="btn btn-primary edit-confirm">OK</button>' +
                '<button class="btn edit-cancel">✕</button>' +
              '</span>'
            : (hasHostname
                ? '<button class="btn btn-primary" data-action="pin">Pin</button>'
                : '<button class="btn btn-primary pin-needs-name" data-action="pin-name">Pin</button>' +
                  '<span class="edit-form" style="display:none">' +
                    '<input type="text" class="edit-hostname" placeholder="hostname" size="16">' +
                    '<button class="btn btn-primary edit-confirm">OK</button>' +
                    '<button class="btn edit-cancel">✕</button>' +
                  '</span>'
              )
          ) +
        '</td>' +
      '</tr>'
    );
  }).join('');

  tbody.innerHTML = rows;
}

function esc(s) {
  if (!s) return '';
  return s.replace(/&/g, '&amp;').replace(/</g, '&lt;').replace(/>/g, '&gt;');
}

function escAttr(s) {
  if (!s) return '';
  return s.replace(/&/g, '&amp;').replace(/"/g, '&quot;').replace(/'/g, '&#39;');
}

// ---------------------------------------------------------------------------
// Actions
// ---------------------------------------------------------------------------

function loadLeases() {
  $.get('./api/leases', function (data) {
    renderLeases(data);
  }).fail(function () {
    showToast('Failed to load leases', 'error');
  });
}

function pinLease(mac, ip, hostname) {
  $.cjax({
    url: './api/pin',
    type: 'POST',
    dataType: 'json',
    data: { mac: mac, ip: ip, hostname: hostname || '' },
    success: function () {
      showToast('Pinned ' + (hostname || mac), 'success');
      loadLeases();
    },
    error: function (xhr) {
      var msg = 'Pin failed';
      try { var r = JSON.parse(xhr.responseText); msg = r.message || r.error || msg; } catch(e) {}
      showToast(msg, 'error');
    }
  });
}

function unpinLease(mac) {
  $.cjax({
    url: './api/unpin',
    type: 'POST',
    dataType: 'json',
    data: { mac: mac },
    success: function () {
      showToast('Unpinned', 'success');
      loadLeases();
    },
    error: function (xhr) {
      var msg = 'Unpin failed';
      try { var r = JSON.parse(xhr.responseText); msg = r.message || r.error || msg; } catch(e) {}
      showToast(msg, 'error');
    }
  });
}

function updateHostname(mac, ip, hostname) {
  // Re-pin with new hostname (server handles unpin + repin atomically)
  $.cjax({
    url: './api/pin',
    type: 'POST',
    dataType: 'json',
    data: { mac: mac, ip: ip, hostname: hostname },
    success: function () {
      showToast('Hostname updated', 'success');
      loadLeases();
    },
    error: function (xhr) {
      var msg = 'Update failed';
      try { var r = JSON.parse(xhr.responseText); msg = r.message || r.error || msg; } catch(e) {}
      showToast(msg, 'error');
    }
  });
}

function reloadDnsmasq() {
  var btn = document.getElementById('reload-btn');
  btn.disabled = true;
  btn.textContent = 'Reloading...';
  $.cjax({
    url: './api/reload',
    type: 'POST',
    dataType: 'json',
    data: {},
    success: function (data) {
      if (data.success) {
        showToast('dnsmasq reloaded', 'success');
      } else {
        showToast(data.message || 'Reload failed', 'error');
      }
      loadLeases();
    },
    error: function (xhr) {
      var msg = 'Reload failed';
      try { var r = JSON.parse(xhr.responseText); msg = r.message || r.error || msg; } catch(e) {}
      showToast(msg, 'error');
    },
    complete: function () {
      btn.disabled = false;
      btn.textContent = 'Reload dnsmasq';
    }
  });
}

// ---------------------------------------------------------------------------
// Form helpers
// ---------------------------------------------------------------------------

function showEditForm(cell) {
  var editBtn = cell.querySelector('.edit-btn');
  var pinBtn = cell.querySelector('.pin-needs-name');
  if (editBtn) editBtn.style.display = 'none';
  if (pinBtn) pinBtn.style.display = 'none';
  cell.querySelector('.edit-form').style.display = 'inline-flex';
  var input = cell.querySelector('.edit-hostname');
  input.focus();
  input.select();
}

function hideEditForm(cell) {
  cell.querySelector('.edit-form').style.display = 'none';
  var editBtn = cell.querySelector('.edit-btn');
  var pinBtn = cell.querySelector('.pin-needs-name');
  if (editBtn) editBtn.style.display = 'inline-block';
  if (pinBtn) pinBtn.style.display = 'inline-block';
}

function confirmEditForm(cell) {
  var mac = cell.dataset.mac;
  var ip = cell.dataset.ip;
  var input = cell.querySelector('.edit-hostname');
  if (!input) return;
  var hostname = input.value.trim();
  hideEditForm(cell);
  updateHostname(mac, ip, hostname);
}

// ---------------------------------------------------------------------------
// Event delegation
// ---------------------------------------------------------------------------

document.getElementById('leases-body').addEventListener('click', function (e) {
  var cell = e.target.closest('.actions-cell');
  if (!cell) return;

  var mac = cell.dataset.mac;
  var ip = cell.dataset.ip;
  var hostname = cell.dataset.hostname;

  // Pin (one-click — hostname already exists)
  if (e.target.closest('[data-action="pin"]')) {
    pinLease(mac, ip, hostname);
  }

  // Pin (needs name — show form)
  if (e.target.closest('[data-action="pin-name"]')) {
    showEditForm(cell);
  }

  // Edit (pinned lease — show form to change hostname)
  if (e.target.closest('[data-action="edit"]')) {
    showEditForm(cell);
  }

  // Unpin
  if (e.target.closest('[data-action="unpin"]')) {
    unpinLease(mac);
  }

  // Confirm edit (OK button)
  if (e.target.closest('.edit-confirm')) {
    confirmEditForm(cell);
  }

  // Cancel edit (✕ button)
  if (e.target.closest('.edit-cancel')) {
    hideEditForm(cell);
  }
});

document.getElementById('reload-btn').addEventListener('click', reloadDnsmasq);

// ---------------------------------------------------------------------------
// Init
// ---------------------------------------------------------------------------

loadLeases();