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

  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;
  }

  ns.Form = function (options) {
    this.construct.apply(this, arguments);
  };

  var fn = ns.Form.prototype;

  fn.construct = function (options) {
    this.options = $.extend({
      /**
       *  @type {String}
       */
      formId: null,

      /**
       * @type {Object} ex.: {monthNum: dayCount, ...}
       */
      monthDayCount: null
    }, options);

    this.form = $('#' + this.options.formId);
    this.dueDateMonth = $('[name="dueDateMonth"]', this.form);
    this.dueDateDay = $('[name="dueDateDay"]', this.form);

    this.dueDateMonth.bind('change', fnProxy(this.onMonthChange, this));
  };

  fn.onMonthChange = function (e) {
    var month = this.dueDateMonth.val(), lastDay = '', dayCount, i;
    if ('' == month || null == (dayCount = this.options.monthDayCount[month])) {
      this.dueDateDay.val('').attr('disabled', true);
      return;
    }

    this.dueDateDay.attr('disabled', true);
    if (this.dueDateDay.val() > dayCount) {
      this.dueDateDay.val('');
    }
    this.dueDateDay.find('option').each(function (index, node) {
      var $node = $(node);
      lastDay = $node.val();
      if (lastDay !== '' && lastDay > dayCount) {
        $node.remove();
      }
    });

    if (lastDay < dayCount) {
      for (i = +lastDay + 1; i <= dayCount; ++i) {
        $('<option />')
          .attr('value', i)
          .attr('label', i)
          .text(i)
          .appendTo(this.dueDateDay);
      }
    }

    this.dueDateDay.attr('disabled', false).removeClass('disabled');
  };

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