import { default as computed, observes } from 'ember-addons/ember-computed-decorators';
import { setting, propertyEqual } from 'discourse/lib/computed';
import DiscourseURL from 'discourse/lib/url';
import { userPath } from 'discourse/lib/url';
import { popupAjaxError } from 'discourse/lib/ajax-error';

export default Ember.Controller.extend({
  taken: false,
  saving: false,
  errorMessage: null,
  newUsername: null,

  maxLength: setting('max_username_length'),
  minLength: setting('min_username_length'),
  newUsernameEmpty: Em.computed.empty('newUsername'),
  saveDisabled: Em.computed.or('saving', 'newUsernameEmpty', 'taken', 'unchanged', 'errorMessage'),
  unchanged: propertyEqual('newUsername', 'username'),

  @observes("newUsername")
  checkTaken() {
    let newUsername = this.get('newUsername');

    if (newUsername && newUsername.length < this.get('minLength')) {
      this.set('errorMessage', I18n.t('user.name.too_short'));
    } else {
      this.set('taken', false);
      this.set('errorMessage', null);

      if (Ember.isEmpty(this.get('newUsername'))) return;
      if (this.get('unchanged')) return;

      Discourse.User.checkUsername(newUsername, undefined, this.get('content.id')).then(result => {
        if (result.errors) {
          this.set('errorMessage', result.errors.join(' '));
        } else if (result.available === false) {
          this.set('taken', true);
        }
      });
    }
  },

  @computed('saving')
  saveButtonText(saving) {
    if (saving) return I18n.t("saving");
    return I18n.t("user.change");
  },

  actions: {
    changeUsername() {
      if (this.get('saveDisabled')) { return; }

      return bootbox.confirm(I18n.t("user.change_username.confirm"),
                             I18n.t("no_value"),
                             I18n.t("yes_value"), result => {
        if (result) {
          this.set('saving', true);
          this.get('content').changeUsername(this.get('newUsername')).then(() => {
            DiscourseURL.redirectTo(userPath(this.get('newUsername').toLowerCase() + "/preferences"));
          })
          .catch(popupAjaxError)
          .finally(() => this.set('saving', false));
        }
      });
    }
  }

});