var $ = require('jquery');
var _ = require('underscore');
var Backbone = require('backbone');

/**
 * Base Model for all CartoDB model.
 * DO NOT USE Backbone.Model directly
 */
var Model = Backbone.Model.extend({

  initialize: function (options) {
    _.bindAll(this, 'fetch', 'save', 'retrigger');
    return Backbone.Model.prototype.initialize.call(this, options);
  },
  /**
  * We are redefining fetch to be able to trigger an event when the ajax call ends, no matter if there's
  * a change in the data or not. Why don't backbone does this by default? ahh, my friend, who knows.
  * @method fetch
  * @param args {Object}
  */
  fetch: function (args) {
    var self = this;
    // var date = new Date();
    this.trigger('loadModelStarted');
    $.when(Backbone.Model.prototype.fetch.call(this, args)).done(function (ev) {
      self.trigger('loadModelCompleted', ev, self);
      // var dateComplete = new Date()
      // console.log('completed in '+(dateComplete - date));
    }).fail(function (ev) {
      self.trigger('loadModelFailed', ev, self);
    });
  },
  /**
  * Changes the attribute used as Id
  * @method setIdAttribute
  * @param attr {String}
  */
  setIdAttribute: function (attr) {
    this.idAttribute = attr;
  },
  /**
  * Listen for an event on another object and triggers on itself, with the same name or a new one
  * @method retrigger
  * @param ev {String} event who triggers the action
  * @param obj {Object} object where the event happens
  * @param obj {Object} [optional] name of the retriggered event
  * @todo [xabel]: This method is repeated here and in the base view definition. There's should be a way to make it unique
  */
  retrigger: function (ev, obj, retrigEvent) {
    if (!retrigEvent) {
      retrigEvent = ev;
    }
    var self = this;
    obj.bind && obj.bind(ev, function () {
      self.trigger(retrigEvent);
    }, self);
  },

  /**
   * We need to override backbone save method to be able to introduce new kind of triggers that
   * for some reason are not present in the original library. Because you know, it would be nice
   * to be able to differenciate "a model has been updated" of "a model is being saved".
   * TODO: remove jquery from here
   * @param  {object} opt1
   * @param  {object} opt2
   * @return {$.Deferred}
   */
  save: function (opt1, opt2) {
    var self = this;
    if (!opt2 || !opt2.silent) this.trigger('saving');
    var promise = Backbone.Model.prototype.save.apply(this, arguments);
    $.when(promise).done(function () {
      if (!opt2 || !opt2.silent) self.trigger('saved');
    }).fail(function () {
      if (!opt2 || !opt2.silent) self.trigger('errorSaving');
    });
    return promise;
  }
});

module.exports = Model;