// ── 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 messageEl = document.getElementById('serverSettingsMessage');
    var inputs = {};

    function showMessage(text, isError) {
      messageEl.textContent = text;
      messageEl.className = 'profile-message ' + (isError ? 'profile-message-error' : 'profile-message-success');
      messageEl.hidden = false;
      if (!isError) setTimeout(function() { messageEl.hidden = true; }, 4000);
    }

    // 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 === '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', async function() {
        saveBtn.disabled = true;
        messageEl.hidden = true;

        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 {
              data[def.key] = input.value;
            }
          }

          var result = await apiSaveServerSettings(data);
          showMessage(result.hint || 'Einstellungen gespeichert', false);
        } catch (err) {
          showMessage(err.message, true);
        } finally {
          saveBtn.disabled = false;
        }
      });

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

  destroy() {}
});