(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.idMap = options.idMap;
        this.partName = options.partName;
        this.startDateLabels = options.startDateLabels;

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

        this.initRadio('input[name=durationType]', this.durationTypeOnChange);
        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));

        return true;
    };

    ns.Form.prototype.getTag = function (name, context) {
        if (this.idMap.hasOwnProperty(name)) {
            return $(this.idMap[name], context);
        }
        return $([], context);
    };

    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;
        }
        if (duration != this.getTag('time').find('tbody tr').length) {
            Qs_Form.updatePart(this.form.get(0), this.partName);
        }
    };

    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) {
        if ('committee' == e.target.value && e.target.checked) {
            this.form.find('input[name=durationType][value=singleDay]').prop('checked', true).change();
        }
    };

    ns.Form.prototype.durationTypeOnChange = function (e) {
        if ('singleDay' == e.target.value && e.target.checked) {
            this.endDate.datepicker('setDate', null).datepicker('refresh').change();
        } else if (null == this.endDate.datepicker('getDate')) {
            var endDate = this.startDate.datepicker('getDate');
            endDate = moment(endDate).add('day', 1).toDate();
            this.endDate.datepicker('setDate', endDate).datepicker('refresh').change();
        }
        this.form.find('label[for=startDate]').text(this.startDateLabels[e.target.value]);
    };
})(qs.defineNS('app.event.admin'));