Vizzuality/gfw-climate

/**
 * The Presenter class. Add unsubscribe funcionallity.
 *
 * @return PresenterClass class
 */
define(['underscore', 'Class', 'mps'], function(_, Class, mps) {
  'use strict';

  var PresenterClass = Class.extend({
    init: function(view, options) {
      options = _.extend({}, { register: false }, options);
      this._cachedSubscriptions = [];

      if (this._subscriptions) {
        this._subscribe();
      }
    },

    /**
     * Unsubscribe presenter mps subscriptions.
     */
    unsubscribe: function() {
      for (var i = 0; i < this._cachedSubscriptions.length; i++) {
        mps.unsubscribe(this._cachedSubscriptions[i]);
      }
    },

    /**
     * Subscribe to events and append them to this._subs.
     */
    _subscribe: function() {
      _.each(
        this._subscriptions,
        _.bind(function(subscription) {
          _.each(
            subscription,
            _.bind(function(callback, name) {
              this._cachedSubscriptions.push(
                mps.subscribe(name, _.bind(callback, this))
              );
            }, this)
          );
        }, this)
      );
    }
  });

  return PresenterClass;
});