/**
 * DHCP Lease Manager — client-side logic.
 * All API URLs are relative to the page path, so the Zoraxy proxy handles routing.
 */

const API_BASE = './api';
const csrfToken = document.querySelector('meta[name="csrf-token"]')?.content || '';

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

function showToast(message, type) {
  const toast = document.getElementById('toast');
  toast.textContent = message;
  toast.className = 'toast ' + type;
  void toast.offsetWidth; // force reflow for transition
  toast.classList.remove('hidden');
  setTimeout(function () { toast.classList.add('hidden'); }, 3000);
}

/** Minimal fetch wrapper that includes the CSRF token. */
async function apiFetch(path, opts) {
  opts = opts || {};
  opts.headers = opts.headers || {};
  var method = (opts.method || 'GET').toUpperCase();
  var isPost = (method === 'POST' || method === 'PUT' || method === 'PATCH');
  
  // Attach CSRF token as query param (Zoraxy may validate it there)
  if (csrfToken && csrfToken !== '{{.csrfToken}}') {
    var sep = path.indexOf('?') >= 0 ? '&' : '?';
    path = path + sep + 'csrfToken=' + encodeURIComponent(csrfToken);
    opts.headers['X-Zoraxy-Csrf'] = csrfToken;
  }

  if (isPost && opts.body && typeof opts.body === 'object') {
    // Send as URL-encoded form data (Zoraxy's CSRF middleware parses forms, not JSON)
    var formBody = new URLSearchParams();
    for (var key in opts.body) {
      if (opts.body.hasOwnProperty(key)) {
        formBody.append(key, opts.body[key]);
      }
    }
    formBody.append('csrfToken', csrfToken || '');
    opts.body = formBody.toString();
    opts.headers['Content-Type'] = 'application/x-www-form-urlencoded';
  }
  var res = await fetch(API_BASE + path, opts);
  var text = await res.text();
  try {
    var data = JSON.parse(text);
  } catch (e) {
    throw new Error('Unexpected response (status ' + res.status + '). Check plugin is running.');
  }
  if (!res.ok) {
    throw new Error(data.error || data.message || 'Request failed (status ' + res.status + ')');
  }
  return data;
}

function formatTime(t) {
  var d = new Date(t);
  if (isNaN(d.getTime())) return '--';
  return d.toLocaleString();
}

// ---------------------------------------------------------------------------
// 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';
    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">' +
          (isPermanent
            ? '<button class="btn btn-danger" data-action="unpin" data-mac="' + escAttr(lease.mac) + '" data-ip="' + escAttr(lease.ip) + '" data-hostname="' + escAttr(lease.hostname) + '">Unpin</button>'
            : '<button class="btn btn-primary" data-action="pin" data-mac="' + escAttr(lease.mac) + '" data-ip="' + escAttr(lease.ip) + '" data-hostname="' + escAttr(lease.hostname) + '">Pin</button>'
          ) +
        '</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
// ---------------------------------------------------------------------------

async function loadLeases() {
  try {
    var data = await apiFetch('/leases');
    renderLeases(data);
  } catch (err) {
    showToast('Failed to load leases: ' + err.message, 'error');
  }
}

async function pinLease(mac, ip, hostname) {
  try {
    await apiFetch('/pin', {
      method: 'POST',
      body: { mac: mac, ip: ip, hostname: hostname || '' }
    });
    showToast('Pinned ' + (hostname || mac), 'success');
    loadLeases();
  } catch (err) {
    showToast('Pin failed: ' + err.message, 'error');
  }
}

async function unpinLease(mac, ip, hostname) {
  try {
    await apiFetch('/unpin', {
      method: 'POST',
      body: { mac: mac, ip: ip, hostname: hostname || '' }
    });
    showToast('Unpinned ' + (hostname || mac), 'success');
    loadLeases();
  } catch (err) {
    showToast('Unpin failed: ' + err.message, 'error');
  }
}

async function reloadDnsmasq() {
  var btn = document.getElementById('reload-btn');
  btn.disabled = true;
  btn.textContent = 'Reloading...';
  try {
    await apiFetch('/reload', { method: 'POST' });
    showToast('dnsmasq reloaded', 'success');
    loadLeases();
  } catch (err) {
    showToast('Reload failed: ' + err.message, 'error');
  } finally {
    btn.disabled = false;
    btn.textContent = 'Reload dnsmasq';
  }
}

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

document.getElementById('leases-body').addEventListener('click', function (e) {
  var btn = e.target.closest('button[data-action]');
  if (!btn) return;

  var action = btn.dataset.action;
  var mac = btn.dataset.mac;
  var ip = btn.dataset.ip;
  var hostname = btn.dataset.hostname;

  if (action === 'pin') {
    pinLease(mac, ip, hostname);
  } else if (action === 'unpin') {
    unpinLease(mac, ip, hostname);
  }
});

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

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

loadLeases();