// ============================================================
// ADMIN.JS — Admin panel: users, settings, stats
// ============================================================

(function() {

  var loaded = false;

  // Load admin panel when tab is clicked
  document.addEventListener('click', function(e) {
    var btn = e.target.closest('.tab-btn');
    if (btn && btn.getAttribute('data-tab') === 'admin') {
      if (!loaded) { loadAdmin(); loaded = true; }
    }
    // Refresh button
    if (e.target.closest('#btn-refresh-users')) {
      loadUsers();
    }
    // Toggle registration
    if (e.target.closest('#btn-toggle-reg')) {
      toggleRegistration();
    }
  });

  function loadAdmin() {
    loadSettings();
    loadUsers();
  }

  // ---- SETTINGS + STATS ----

  function loadSettings() {
    fetch('/api/admin/settings', { headers: getAuthHeaders() })
      .then(function(r) { return r.json(); })
      .then(function(data) {
        if (!data.success) return;
        var stats = data.stats || {};
        var settings = data.settings || {};

        var el = document.getElementById('stat-users');
        if (el) el.textContent = stats.totalUsers !== undefined ? stats.totalUsers : '—';
        el = document.getElementById('stat-api-total');
        if (el) el.textContent = stats.totalApiCalls !== undefined ? stats.totalApiCalls : '—';
        el = document.getElementById('stat-api-today');
        if (el) el.textContent = stats.todayApiCalls !== undefined ? stats.todayApiCalls : '—';

        updateRegStatus(settings.registrationEnabled !== false);
      })
      .catch(function(err) { console.error('[Admin] Settings load failed:', err); });
  }

  function updateRegStatus(enabled) {
    var text = document.getElementById('reg-status-text');
    var btn = document.getElementById('btn-toggle-reg');
    if (text) {
      text.innerHTML = 'Registration is currently <strong style="color:' + (enabled ? 'var(--green)' : 'var(--red)') + '">' + (enabled ? '✅ Enabled' : '❌ Disabled') + '</strong>';
    }
    if (btn) btn.textContent = enabled ? 'Disable Registration' : 'Enable Registration';
    window._adminRegEnabled = enabled;
  }

  function toggleRegistration() {
    var newVal = !window._adminRegEnabled;
    fetch('/api/admin/settings/registration', {
      method: 'POST',
      headers: getAuthHeaders(),
      body: JSON.stringify({ enabled: newVal })
    })
    .then(function(r) { return r.json(); })
    .then(function(data) {
      if (data.success) {
        updateRegStatus(newVal);
        showToast('Registration ' + (newVal ? 'enabled' : 'disabled'), 'success');
      } else {
        showToast(data.error || 'Failed', 'error');
      }
    })
    .catch(function() { showToast('Request failed', 'error'); });
  }

  // ---- USERS ----

  function loadUsers() {
    var tbody = document.getElementById('admin-users-body');
    if (!tbody) return;
    tbody.innerHTML = '<tr><td colspan="5" style="text-align:center;color:var(--g400);padding:20px;">Loading...</td></tr>';

    fetch('/api/admin/users', { headers: getAuthHeaders() })
      .then(function(r) { return r.json(); })
      .then(function(data) {
        if (!data.success) { tbody.innerHTML = '<tr><td colspan="5" style="text-align:center;color:var(--red);padding:20px;">Failed to load users</td></tr>'; return; }
        renderUsers(data.users || []);
      })
      .catch(function() { tbody.innerHTML = '<tr><td colspan="5" style="text-align:center;color:var(--red);padding:20px;">Request failed</td></tr>'; });
  }

  function renderUsers(users) {
    var tbody = document.getElementById('admin-users-body');
    if (!tbody) return;

    var currentUser = JSON.parse(localStorage.getItem('ped_scribe_user') || '{}');

    if (users.length === 0) {
      tbody.innerHTML = '<tr><td colspan="5" style="text-align:center;color:var(--g400);padding:20px;">No users found</td></tr>';
      return;
    }

    tbody.innerHTML = users.map(function(u) {
      var isSelf = currentUser.id && u.id === currentUser.id;
      var roleColor = u.role === 'admin' ? 'var(--blue)' : 'var(--g500)';
      var statusColor = u.disabled ? 'var(--red)' : (u.email_verified ? 'var(--green)' : 'var(--amber)');
      var statusText = u.disabled ? 'Disabled' : (u.email_verified ? 'Active' : 'Unverified');
      var joined = u.created_at ? new Date(u.created_at).toLocaleDateString() : '—';

      var actions = [];
      if (!isSelf) {
        if (!u.email_verified) {
          actions.push('<button class="btn-sm btn-primary admin-action" data-action="verify" data-id="' + u.id + '" data-email="' + esc(u.email) + '">Verify</button>');
        }
        if (u.disabled) {
          actions.push('<button class="btn-sm btn-success admin-action" data-action="enable" data-id="' + u.id + '" data-email="' + esc(u.email) + '">Enable</button>');
        } else {
          actions.push('<button class="btn-sm btn-ghost admin-action" data-action="disable" data-id="' + u.id + '" data-email="' + esc(u.email) + '">Disable</button>');
        }
        if (u.role === 'admin') {
          actions.push('<button class="btn-sm btn-ghost admin-action" data-action="demote" data-id="' + u.id + '" data-email="' + esc(u.email) + '">Demote</button>');
        } else {
          actions.push('<button class="btn-sm btn-primary admin-action" data-action="promote" data-id="' + u.id + '" data-email="' + esc(u.email) + '">Make Admin</button>');
        }
        actions.push('<button class="btn-sm btn-ghost admin-action" data-action="reset-pw" data-id="' + u.id + '" data-email="' + esc(u.email) + '">Reset PW</button>');
        actions.push('<button class="btn-sm admin-action" style="background:var(--red-light);color:var(--red);" data-action="delete" data-id="' + u.id + '" data-email="' + esc(u.email) + '" data-name="' + esc(u.name) + '">Delete</button>');
      } else {
        actions.push('<span style="font-size:12px;color:var(--g400);">(you)</span>');
      }

      return '<tr>' +
        '<td><div style="font-weight:600;font-size:13px;">' + esc(u.name) + '</div><div style="font-size:11px;color:var(--g500);">' + esc(u.email) + '</div></td>' +
        '<td><span style="font-size:12px;font-weight:600;color:' + roleColor + ';">' + (u.role || 'user') + '</span></td>' +
        '<td><span style="font-size:12px;color:' + statusColor + ';">' + statusText + '</span></td>' +
        '<td style="font-size:12px;color:var(--g500);">' + joined + '</td>' +
        '<td style="white-space:nowrap;">' + actions.join(' ') + '</td>' +
        '</tr>';
    }).join('');

    // Bind action buttons
    tbody.querySelectorAll('.admin-action').forEach(function(btn) {
      btn.addEventListener('click', function() {
        handleUserAction(btn.dataset.action, btn.dataset.id, btn.dataset.email, btn.dataset.name);
      });
    });
  }

  function handleUserAction(action, userId, email, name) {
    switch (action) {

      case 'verify':
        if (!confirm('Verify email for ' + email + '?')) return;
        adminPost('/api/admin/users/' + userId + '/verify', {}, function() {
          showToast(email + ' verified', 'success'); loadUsers();
        });
        break;

      case 'disable':
        if (!confirm('Disable account for ' + email + '?')) return;
        adminPost('/api/admin/users/' + userId + '/disable', {}, function() {
          showToast(email + ' disabled', 'info'); loadUsers();
        });
        break;

      case 'enable':
        adminPost('/api/admin/users/' + userId + '/enable', {}, function() {
          showToast(email + ' enabled', 'success'); loadUsers();
        });
        break;

      case 'promote':
        if (!confirm('Grant admin role to ' + email + '?')) return;
        adminPost('/api/admin/users/' + userId + '/role', { role: 'admin' }, function() {
          showToast(email + ' is now admin', 'success'); loadUsers();
        });
        break;

      case 'demote':
        if (!confirm('Remove admin role from ' + email + '?')) return;
        adminPost('/api/admin/users/' + userId + '/role', { role: 'user' }, function() {
          showToast(email + ' demoted to user', 'info'); loadUsers();
        });
        break;

      case 'reset-pw':
        var newPw = prompt('New password for ' + email + ' (8+ characters):');
        if (!newPw) return;
        if (newPw.length < 8) { showToast('Password must be 8+ characters', 'error'); return; }
        adminPost('/api/admin/users/' + userId + '/reset-password', { newPassword: newPw }, function() {
          showToast('Password reset for ' + email, 'success');
        });
        break;

      case 'delete':
        if (!confirm('Permanently delete user ' + (name || email) + '?\n\nThis cannot be undone.')) return;
        fetch('/api/admin/users/' + userId, { method: 'DELETE', headers: getAuthHeaders() })
          .then(function(r) { return r.json(); })
          .then(function(data) {
            if (data.success) { showToast(email + ' deleted', 'info'); loadUsers(); }
            else showToast(data.error || 'Delete failed', 'error');
          })
          .catch(function() { showToast('Request failed', 'error'); });
        break;
    }
  }

  function adminPost(url, body, onSuccess) {
    fetch(url, {
      method: 'POST',
      headers: getAuthHeaders(),
      body: JSON.stringify(body)
    })
    .then(function(r) { return r.json(); })
    .then(function(data) {
      if (data.success) { onSuccess(data); }
      else showToast(data.error || 'Request failed', 'error');
    })
    .catch(function() { showToast('Request failed', 'error'); });
  }

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

})();