/**
  @module ember-flexberry-data
*/

import Mixin from '@ember/object/mixin';
import RSVP from 'rsvp';
import { getOwner } from '@ember/application';
import { computed } from '@ember/object';
import DS from 'ember-data';

export default Mixin.create({
  /**
    Creation date and time of model.

    @property createTime
    @type Date
  */
  createTime: DS.attr('date'),

  /**
    Name of user who created model.

    @property creator
    @type String
  */
  creator: DS.attr('string'),

  /**
    Date and time of last changes in model.

    @property editTime
    @type Date
  */
  editTime: DS.attr('date'),

  /**
    Name of user who changed model last time.

    @property editor
    @type String
  */
  editor: DS.attr('string'),

  /**
    Name of current user.

    @property currentUserName
    @readOnly
  */
  currentUserName: computed(function() {
    let userService = getOwner(this).lookup('service:user');
    return userService.getCurrentUserName();
  }).readOnly(),

  /**
    Save the record and persist any changes to the record to an external source via the adapter.
    [More info](http://emberjs.com/api/data/classes/DS.Model.html#method_save).

    @method save
    @param {Object} [options]
    @return {Promise}
  */
  save() {
    const _super = this._super;

    const currentDate = new Date();
    const currentUserPromise = new RSVP.Promise((resolve, reject) => {
      const userName = this.get('currentUserName');
      if (userName instanceof RSVP.Promise) {
        userName.then(resolve, reject);
      } else {
        resolve(userName);
      }
    });

    return currentUserPromise.then((currentUser) => {
      if (this.get('isNew')) {
        this.set('createTime', currentDate);
        this.set('creator', currentUser);
      } else if (this.get('hasDirtyAttributes') && !this.get('isDeleted')) {
        this.set('editTime', currentDate);
        this.set('editor', currentUser);
      }

      const result = _super.apply(this, arguments);
      if (result instanceof RSVP.Promise) {
        return result;
      }

      return RSVP.resolve(result);
    });
  },
});