// ── Server Settings Page (Admin) ──

registerPage('server-settings', {
  async init() {
    if (!currentUser || !currentUser.isAdmin) {
      navigateTo('dashboard');
      return;
    }

    var container = document.getElementById('serverSettingsFields');
    var saveBtn = document.getElementById('serverSettingsSaveBtn');
    var inputs = {};

    // Settings laden und Formular aufbauen
    try {
      var result = await apiGetServerSettings();
      var settings = result.settings;

      for (var i = 0; i < settings.length; i++) {
        var s = settings[i];
        var field = document.createElement('div');
        field.className = 'form-field';

        var label = document.createElement('label');
        label.textContent = s.label;
        label.setAttribute('for', 'ss-' + s.key);
        field.appendChild(label);

        if (s.inputType === 'checkboxes' && s.options) {
          var cbGroup = document.createElement('div');
          cbGroup.className = 'checkbox-group';
          cbGroup.id = 'ss-' + s.key;
          var selected = Array.isArray(s.value) ? s.value : [];

          // Select All / Deselect All Buttons
          var cbActions = document.createElement('div');
          cbActions.className = 'checkbox-group-actions';
          var selectAllBtn = document.createElement('button');
          selectAllBtn.type = 'button';
          selectAllBtn.className = 'btn btn-xs';
          selectAllBtn.textContent = 'Alle';
          var deselectAllBtn = document.createElement('button');
          deselectAllBtn.type = 'button';
          deselectAllBtn.className = 'btn btn-xs';
          deselectAllBtn.textContent = 'Keine';
          cbActions.appendChild(selectAllBtn);
          cbActions.appendChild(deselectAllBtn);
          cbGroup.appendChild(cbActions);

          var checkboxes = [];
          for (var oi = 0; oi < s.options.length; oi++) {
            var opt = s.options[oi];
            var cbItem = document.createElement('label');
            cbItem.className = 'checkbox-item';
            var cb2 = document.createElement('input');
            cb2.type = 'checkbox';
            cb2.value = opt.id;
            cb2.checked = selected.indexOf(opt.id) !== -1;
            checkboxes.push(cb2);
            var cbText = document.createElement('span');
            cbText.textContent = opt.name;
            cbItem.appendChild(cb2);
            cbItem.appendChild(cbText);
            cbGroup.appendChild(cbItem);
          }

          selectAllBtn.addEventListener('click', function() {
            for (var ci = 0; ci < checkboxes.length; ci++) checkboxes[ci].checked = true;
          });
          deselectAllBtn.addEventListener('click', function() {
            for (var ci = 0; ci < checkboxes.length; ci++) checkboxes[ci].checked = false;
          });

          inputs[s.key] = { _checkboxes: checkboxes };
          field.appendChild(cbGroup);
        } else if (s.inputType === 'toggle') {
          var toggleLabel = document.createElement('label');
          toggleLabel.className = 'toggle-label';

          var cb = document.createElement('input');
          cb.type = 'checkbox';
          cb.id = 'ss-' + s.key;
          cb.checked = !!s.value;
          inputs[s.key] = cb;

          var span = document.createElement('span');
          span.textContent = s.value ? 'Aktiviert' : 'Deaktiviert';

          cb.addEventListener('change', (function(sp, checkbox) {
            return function() { sp.textContent = checkbox.checked ? 'Aktiviert' : 'Deaktiviert'; };
          })(span, cb));

          toggleLabel.appendChild(cb);
          toggleLabel.appendChild(span);
          field.appendChild(toggleLabel);
        } else if (s.inputType === 'password') {
          var wrapper = document.createElement('div');
          wrapper.className = 'input-with-btn';

          var inp = document.createElement('input');
          inp.type = 'password';
          inp.id = 'ss-' + s.key;
          inp.value = s.value || '';
          inp.placeholder = s.label;
          inp.autocomplete = 'off';
          inputs[s.key] = inp;

          var toggleBtn = document.createElement('button');
          toggleBtn.type = 'button';
          toggleBtn.className = 'icon-btn';
          toggleBtn.innerHTML = '<i class="fa fa-eye"></i>';
          toggleBtn.addEventListener('click', (function(input, btn) {
            return function() {
              if (input.type === 'password') {
                input.type = 'text';
                btn.innerHTML = '<i class="fa fa-eye-slash"></i>';
              } else {
                input.type = 'password';
                btn.innerHTML = '<i class="fa fa-eye"></i>';
              }
            };
          })(inp, toggleBtn));

          wrapper.appendChild(inp);
          wrapper.appendChild(toggleBtn);
          field.appendChild(wrapper);
        } else if (s.inputType === 'number') {
          var inp = document.createElement('input');
          inp.type = 'number';
          inp.id = 'ss-' + s.key;
          inp.value = s.value != null ? s.value : '';
          inp.placeholder = s.label;
          inputs[s.key] = inp;
          field.appendChild(inp);
        } else {
          var inp = document.createElement('input');
          inp.type = 'text';
          inp.id = 'ss-' + s.key;
          inp.value = s.value || '';
          inp.placeholder = s.label;
          inputs[s.key] = inp;
          field.appendChild(inp);
        }

        container.appendChild(field);
      }

      // Speichern
      saveBtn.addEventListener('click', () => withButtonLoading(saveBtn, 'Speichern...', async () => {
        try {
          var data = {};
          for (var j = 0; j < settings.length; j++) {
            var def = settings[j];
            var input = inputs[def.key];
            if (!input) continue;

            if (def.type === 'bool') {
              data[def.key] = input.checked;
            } else if (def.type === 'int') {
              data[def.key] = parseInt(input.value, 10) || 0;
            } else if (def.type === 'string_array' && input._checkboxes) {
              var vals = [];
              for (var ci = 0; ci < input._checkboxes.length; ci++) {
                if (input._checkboxes[ci].checked) vals.push(input._checkboxes[ci].value);
              }
              data[def.key] = vals;
            } else {
              data[def.key] = input.value;
            }
          }

          var result = await apiSaveServerSettings(data);
          showToast(result.hint || 'Einstellungen gespeichert');
        } catch (err) {
          showToast(err.message, 'error');
        }
      }));

    } catch (err) {
      container.innerHTML = '<p class="form-error">Fehler beim Laden: ' + esc(err.message) + '</p>';
    }
  },

  destroy() {}
});