(function(ns) {
    "use strict";
    /**
     * @alias app.event.admin.Form
     * @constructor
     */
    ns.Form = function () { this.construct.apply(this, arguments); };

    ns.Form.prototype.construct = function (options) {
        this.eventNS = 'eventAdmin';

        this.form = $('#' + options.id);
        if (!this.form.length) {
            return false;
        }
        this.partName = options.partName;
        this.subtypes = options.subtypes;
        this.selectedSubtype = options.selectedSubtype;

        this.startDate = this.form.find('input[name=_startDate]');
        this.endDate = this.form.find('input[name=_endDate]');

        this.initRadio('input[name=type]', this.typeOnChange);

        this.startDate.datepicker().on('change.' + this.eventNS, _.bind(this.dateRangeOnChange, this));
        this.endDate.datepicker().on('change.' + this.eventNS, _.bind(this.dateRangeOnChange, this));

        this.form.find('input[name=type]').change(_.bind(this.typeOnChange, this));
        this.form.find('#ceus-element').on('dfHide dfShow', _.bind(this.ceusOnToggle, this));
        return true;
    };

    ns.Form.prototype.getTime = function (element, defaultTime) {
        var date = element.datepicker('getDate');
        if (date instanceof Date) {
            return date.getTime();
        }
        return defaultTime || null;
    };

    ns.Form.prototype.dateRangeOnChange = function () {
        var startTime = this.getTime(this.startDate);
        if (null == startTime) {
            return;
        }
        var endTime = this.getTime(this.endDate, startTime);
        var duration = 0;
        if (startTime > endTime) {
            return;
        }
        if (startTime < endTime) {
            duration =  Math.ceil((endTime - startTime) / (24*60*60*1000) + 1);
        } else if (startTime == endTime) {
            duration = 1;
        }
    };

    ns.Form.prototype.initRadio = function (selector, func) {
        this.form.find(selector).change(_.bind(func, this));
        this.form.find(selector + ':checked').change();
    };

    ns.Form.prototype.typeOnChange = function (e) {
        var subtype = $("#subtype");
        var emptyTitle = subtype.find('option:first').text();
        var option = $('<option></option>').attr("value", "").text(emptyTitle);
        subtype.empty().append(option);

         if ('undefined' != typeof this.subtypes[e.target.value]) {
             $('dt#subtype-label, dd#subtype-element').show();

             for (var i = 0; i < this.subtypes[e.target.value].length; i++) {
                 var optionContainer = this.subtypes[e.target.value][i];
                 option = $('<option></option>').attr("value", optionContainer.id).text(optionContainer.title);
                 subtype.append(option);
             }

             if (this.selectedSubtype) {
                 subtype.val(this.selectedSubtype);
             }

         } else {
             //hide select
             $('dt#subtype-label, dd#subtype-element').hide();
         }
    };

    ns.Form.prototype.ceusOnToggle = function (e) {
        var visible = $(e.currentTarget).is(':visible');
        this.form.toggleClass('form-no-ceus', !visible);
    }

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