define(function(require, exports, module) {
'use strict';

function Cal(options) {
  if (typeof(options) === 'undefined') {
    options = {};
  }

  this.remote = {};

  for (var key in options) {
    if (options.hasOwnProperty(key)) {
      this[key] = options[key];
    }
  }
}
module.exports = Cal;

Cal.prototype = {

  /**
   * Local copy of calendars remote state.
   * Taken from a calendar providers .toJSON method.
   *
   * @type {Object}
   */
  remote: null,

  /**
   * The date at which this calendar's events
   * where synchronized.
   *
   * @type {Date}
   */
  firstEventSyncDate: null,

  /**
   * Last sync token used in previous
   * event synchronization.
   *
   * @type {String}
   */
  lastEventSyncToken: '',

  /**
   * Last date of event synchronization.
   * This is not going to be used
   * for any kind of serious operation
   * right now this is just for the UI.
   *
   * @type {Date}
   */
  lastEventSyncDate: '',

  /**
   * Indicates if calendar is displayed
   * locally in the ui.
   *
   * @type {Boolean}
   */
  localDisplayed: true,

  /**
   * Id of account this record
   * is associated with.
   */
  accountId: '',

  /**
   * Updates remote with data from a calendar provider.
   *
   * @param {Calendar.Provider.Calendar.Abstract} provider remote.
   */
  updateRemote: function(provider) {
    var data = provider;
    if ('toJSON' in provider) {
        data = provider.toJSON();
    }

    this.remote = data;
  },

  /**
   * Checks if local and remote state differ
   * via sync tokens. Returns true when
   * local sync token and remote do not match.
   * Does not account for local changes only
   * when the server state has changed
   * and we have not yet synchronized.
   *
   * @return {Boolean} true when sync needed.
   */
  eventSyncNeeded: function() {
    var local = this.lastEventSyncToken;
    var remote = this.remote.syncToken;

    return local != remote;
  },

  set name(name) {
    this.remote.name = name;
    return this.remote.name;
  },

  set color(color) {
    this.remote.color = color;
    return this.remote.color;
  },

  set description(description) {
    this.remote.description = description;
    return this.remote.description;
  },

  get name() {
    return this.remote.name;
  },

  get color() {
    var color = this.remote.color;
    if (color) {
      if (color.substr(0, 1) === '#') {
        return color.substr(0, 7);
      }
    }
    return this.remote.color;
  },

  get description() {
    return this.remote.description;
  },

  toJSON: function() {
    var result = {
      error: this.error,
      remote: this.remote,
      accountId: this.accountId,
      localDisplayed: this.localDisplayed,
      lastEventSyncDate: this.lastEventSyncDate,
      lastEventSyncToken: this.lastEventSyncToken,
      firstEventSyncDate: this.firstEventSyncDate
    };

    if (this._id || this._id === 0) {
      result._id = this._id;
    }

    return result;
  }

};

});