import UserPage from 'flarum/components/UserPage';
import ItemList from 'flarum/utils/ItemList';
import Switch from 'flarum/components/Switch';
import Button from 'flarum/components/Button';
import FieldSet from 'flarum/components/FieldSet';
import NotificationGrid from 'flarum/components/NotificationGrid';
import ChangePasswordModal from 'flarum/components/ChangePasswordModal';
import ChangeEmailModal from 'flarum/components/ChangeEmailModal';
import listItems from 'flarum/helpers/listItems';

/**
 * The `SettingsPage` component displays the user's settings control panel, in
 * the context of their user profile.
 */
export default class SettingsPage extends UserPage {
  init() {
    super.init();

    this.show(app.session.user);
    app.setTitle(app.trans('core.forum.settings_title'));
  }

  content() {
    return (
      <div className="SettingsPage">
        <ul>{listItems(this.settingsItems().toArray())}</ul>
      </div>
    );
  }

  /**
   * Build an item list for the user's settings controls.
   *
   * @return {ItemList}
   */
  settingsItems() {
    const items = new ItemList();

    items.add('account',
      FieldSet.component({
        label: app.trans('core.forum.settings_account_heading'),
        className: 'Settings-account',
        children: this.accountItems().toArray()
      })
    );

    items.add('notifications',
      FieldSet.component({
        label: app.trans('core.forum.settings_notifications_heading'),
        className: 'Settings-notifications',
        children: [NotificationGrid.component({user: this.user})]
      })
    );

    items.add('privacy',
      FieldSet.component({
        label: app.trans('core.forum.settings_privacy_heading'),
        className: 'Settings-privacy',
        children: this.privacyItems().toArray()
      })
    );

    return items;
  }

  /**
   * Build an item list for the user's account settings.
   *
   * @return {ItemList}
   */
  accountItems() {
    const items = new ItemList();

    items.add('changePassword',
      Button.component({
        children: app.trans('core.forum.settings_change_password_button'),
        className: 'Button',
        onclick: () => app.modal.show(new ChangePasswordModal())
      })
    );

    items.add('changeEmail',
      Button.component({
        children: app.trans('core.forum.settings_change_email_button'),
        className: 'Button',
        onclick: () => app.modal.show(new ChangeEmailModal())
      })
    );

    return items;
  }

  /**
   * Generate a callback that will save a value to the given preference.
   *
   * @param {String} key
   * @return {Function}
   */
  preferenceSaver(key) {
    return (value, component) => {
      if (component) component.loading = true;
      m.redraw();

      this.user.savePreferences({[key]: value}).then(() => {
        if (component) component.loading = false;
        m.redraw();
      });
    };
  }

  /**
   * Build an item list for the user's privacy settings.
   *
   * @return {ItemList}
   */
  privacyItems() {
    const items = new ItemList();

    items.add('discloseOnline',
      Switch.component({
        children: app.trans('core.forum.settings_privacy_disclose_online_label'),
        state: this.user.preferences().discloseOnline,
        onchange: (value, component) => {
          this.user.pushAttributes({lastSeenTime: null});
          this.preferenceSaver('discloseOnline')(value, component);
        }
      })
    );

    return items;
  }
}