/**
 * @required $ jQuery
 */
(function (ns) {

  // part of jquery
  function fnProxy(fn, context) {
    if ( typeof context === "string" ) {
      var tmp = fn[ context ];
      context = fn;
      fn = tmp;
    }

    // Quick check to determine if target is callable, in the spec
    // this throws a TypeError, but we will just return undefined.
    if ( !jQuery.isFunction( fn ) ) {
      return undefined;
    }

    // Simulated bind
    var args = Array.prototype.slice.call( arguments, 2 ),
      proxy = function() {
        return fn.apply( context, args.concat( Array.prototype.slice.call( arguments ) ) );
      };

    // Set the guid of unique handler to the same of original handler, so it can be removed
    proxy.guid = fn.guid = fn.guid || proxy.guid || jQuery.guid++;

    return proxy;
  }

  /**
   * @alias app.report.contact.admin.Form
   * @param {Object} options
   * @constructor
   */
  ns.Form = function (options) {
    this.construct.apply(this, arguments);
  };

  var fn = ns.Form.prototype;

  fn.construct = function (options) {
    this.options = $.extend({
      requestUrl: undefined,

      ids: {
        form: undefined,
        id: undefined,
        userId: undefined
      }

    }, options);

    this.element = {};
    this.element.form = $('#' + this.options.ids.form);
    this.element.id = $('#' + this.options.ids.id, this.element.form);
    this.element.userId = $('#' + this.options.ids.userId, this.element.form);

    this.element.id.bind('change.contactForm', fnProxy(this.onIdChange, this));
  };

  fn.onIdChange = function () {
    var id = this.element.id.val();

    this.element.userId.attr('disabled', true).addClass('disabled').empty();

    if (null == id || '' == id) {
      return;
    }

    var request = {
      action: 'loadUsers',
      id: id
    };

    $.ajax({
      url: this.options.requestUrl || window.location.href,
      data: request,
      type: 'post',
      dataType: 'json',
      success: fnProxy(this.onUserLoadDone, this),
      error: fnProxy(this.onUserLoadFail, this)
    });
  };

  fn.onUserLoadDone = function (response) {
    var list = [], i, c;
    if (response.userList && response.userList.length) {
      for (i = 0, c = response.userList.length; i < c; ++i) {
        list.push({
          value: response.userList[i].id,
          title: response.userList[i].name
        });
      }
    }
    this.updateElementUserId(list);
  };

  fn.onUserLoadFail = function (response) {
    this.updateElementUserId(null);
  };

  fn.updateElementUserId = function (list) {
    if (null == list) {
      this.element.userId.attr('disabled', true).addClass('disabled').empty();
      return;
    }
    qs.form.select.setOptions(this.element.userId, list, 'Select User');
    this.element.userId.attr('disabled', false).removeClass('disabled');
  };

})(qs.defineNS('app.report.contact.admin'));