define(['exports'], function (exports) {
    /**
     * Date utilities
     */

    'use strict';

    var DateHelper = {
        isValid: function isValid(dateStr, format) {
            if (!format) {
                format = 'DMY';
            }
            format = format.toUpperCase();
            if (format.length != 3) {
                if (format === 'DDMMMYYYY') {
                    var d = this.format(dateStr, format);
                    dateStr = d.getDate() + '/' + (d.getMonth() + 1) + '/' + d.getFullYear();
                    format = 'DMY';
                }
            }
            if (format.indexOf('M') === -1 || format.indexOf('D') === -1 || format.indexOf('Y') === -1) {
                format = 'DMY';
            }
            var reg1, reg2;
            // If the year is first
            if (format.substring(0, 1) == 'Y') {
                reg1 = /^\d{2}(\-|\/|\.)\d{1,2}\1\d{1,2}$/;
                reg2 = /^\d{4}(\-|\/|\.)\d{1,2}\1\d{1,2}$/;
            } else if (format.substring(1, 2) == 'Y') {
                // If the year is second
                reg1 = /^\d{1,2}(\-|\/|\.)\d{2}\1\d{1,2}$/;
                reg2 = /^\d{1,2}(\-|\/|\.)\d{4}\1\d{1,2}$/;
            } else {
                // The year must be third
                reg1 = /^\d{1,2}(\-|\/|\.)\d{1,2}\1\d{2}$/;
                reg2 = /^\d{1,2}(\-|\/|\.)\d{1,2}\1\d{4}$/;
            }
            // If it doesn't conform to the right format (with either a 2 digit year or
            // 4 digit year), fail
            if (reg1.test(dateStr) === false && reg2.test(dateStr) === false) {
                return false;
            }
            // Split into 3 parts based on what the divider was
            var parts = dateStr.split(RegExp.$1);
            var mm, dd, yy;
            // Check to see if the 3 parts end up making a valid date
            if (format.substring(0, 1) === 'M') {
                mm = parts[0];
            } else if (format.substring(1, 2) === 'M') {
                mm = parts[1];
            } else {
                mm = parts[2];
            }
            if (format.substring(0, 1) === 'D') {
                dd = parts[0];
            } else if (format.substring(1, 2) === 'D') {
                dd = parts[1];
            } else {
                dd = parts[2];
            }
            if (format.substring(0, 1) === 'Y') {
                yy = parts[0];
            } else if (format.substring(1, 2) === 'Y') {
                yy = parts[1];
            } else {
                yy = parts[2];
            }
            if (parseInt(yy, 10) <= 50) {
                yy = (parseInt(yy, 10) + 2000).toString();
            }
            if (parseInt(yy, 10) <= 99) {
                yy = (parseInt(yy, 10) + 1900).toString();
            }
            var dt = new Date(parseInt(yy, 10), parseInt(mm, 10) - 1, parseInt(dd, 10), 0, 0, 0, 0);
            if (parseInt(dd, 10) != dt.getDate()) {
                return false;
            }
            if (parseInt(mm, 10) - 1 != dt.getMonth()) {
                return false;
            }
            return true;
        },
        format: (function (_format) {
            function format(_x, _x2) {
                return _format.apply(this, arguments);
            }

            format.toString = function () {
                return _format.toString();
            };

            return format;
        })(function (dateStr, format) {
            if (!format) {
                format = 'DMY';
            }
            if (!dateStr || dateStr === '') {
                return new Date(1001, 0, 1);
            }
            var oDate, parts;

            function y2kDate(yr) {
                if (yr === undefined) {
                    return 0;
                }
                if (yr.length > 2) {
                    return yr;
                }
                var y;
                //>50 belong to 1900
                if (yr <= 99 && yr > 50) {
                    y = '19' + yr;
                }
                //<50 belong to 2000
                if (yr < 50 || yr === '00') {
                    y = '20' + yr;
                }
                return y;
            }

            function mmm2mm(mmm) {
                if (mmm === undefined) {
                    return 0;
                }
                var mondigit;
                var MONTH_NAMES = ['january', 'february', 'march', 'april', 'may', 'june', 'july', 'august', 'september', 'october', 'november', 'december', 'jan', 'feb', 'mar', 'apr', 'may', 'jun', 'jul', 'aug', 'sep', 'oct', 'nov', 'dec'];
                for (var m_i = 0; m_i < MONTH_NAMES.length; m_i++) {
                    var month_name = MONTH_NAMES[m_i];
                    if (mmm.toLowerCase() === month_name) {
                        mondigit = m_i + 1;
                        break;
                    }
                }
                if (mondigit > 11 || mondigit < 23) {
                    mondigit = mondigit - 12;
                }
                if (mondigit < 1 || mondigit > 12) {
                    return 0;
                }
                return mondigit;
            }

            switch (format.toUpperCase()) {
                case 'DDMMMYYYY':
                    parts = dateStr.replace(/[- \/.]/g, ' ').split(' ');
                    oDate = new Date(y2kDate(parts[2]), mmm2mm(parts[1]) - 1, parts[0]);
                    break;
                case 'DMY':
                    parts = dateStr.replace(/^(0?[1-9]|[12][0-9]|3[01])([- \/.])(0?[1-9]|1[012])([- \/.])((\d\d)?\d\d)$/, '$1 $3 $5').split(' ');
                    oDate = new Date(y2kDate(parts[2]), parts[1] - 1, parts[0]);
                    break;
                case 'MDY':
                    parts = dateStr.replace(/^(0?[1-9]|1[012])([- \/.])(0?[1-9]|[12][0-9]|3[01])([- \/.])((\d\d)?\d\d)$/, '$1 $3 $5').split(' ');
                    oDate = new Date(y2kDate(parts[2]), parts[0] - 1, parts[1]);
                    break;
                case 'YMD':
                    parts = dateStr.replace(/^((\d\d)?\d\d)([- \/.])(0?[1-9]|1[012])([- \/.])(0?[1-9]|[12][0-9]|3[01])$/, '$1 $4 $6').split(' ');
                    oDate = new Date(y2kDate(parts[0]), parts[1] - 1, parts[2]);
                    break;
                default:
                    //in case format is not correct
                    parts = dateStr.replace(/^(0?[1-9]|[12][0-9]|3[01])([- \/.])(0?[1-9]|1[012])([- \/.])((\d\d)?\d\d)$/, '$1 $3 $5').split(' ');
                    oDate = new Date(y2kDate(parts[2]), parts[1] - 1, parts[0]);
                    break;
            }
            return oDate;
        })
    };

    exports.DateHelper = DateHelper;
});
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