/* http://keith-wood.name/calendars.html
 Persian calendar for jQuery v2.0.0.
 Written by Keith Wood (kbwood{at}iinet.com.au) August 2009.
 Available under the MIT (https://github.com/jquery/jquery/blob/master/MIT-LICENSE.txt) license. 
 Please attribute the author if you use it. */

        (function ($) { // Hide scope, no $ conflict

            /** Implementation of the Persian or Jalali calendar.
             Based on code from <a href="http://www.iranchamber.com/calendar/converter/iranian_calendar_converter.php">http://www.iranchamber.com/calendar/converter/iranian_calendar_converter.php</a>.
             See also <a href="http://en.wikipedia.org/wiki/Iranian_calendar">http://en.wikipedia.org/wiki/Iranian_calendar</a>.
             @class PersianCalendar
             @param [language=''] {string} The language code (default English) for localisation. */
            function PersianCalendar(language) {
                this.local = this.regionalOptions[language || ''] || this.regionalOptions[''];
            }

            PersianCalendar.prototype = new $.calendars.baseCalendar;

            $.extend(PersianCalendar.prototype, {
                /** The calendar name.
                 @memberof PersianCalendar */
                name: 'Persian',
                /** Julian date of start of Persian epoch: 19 March 622 CE.
                 @memberof PersianCalendar */
                jdEpoch: 1948320.5,
                /** Days per month in a common year.
                 @memberof PersianCalendar */
                daysPerMonth: [31, 31, 31, 31, 31, 31, 30, 30, 30, 30, 30, 29],
                /** <code>true</code> if has a year zero, <code>false</code> if not.
                 @memberof PersianCalendar */
                hasYearZero: false,
                /** The minimum month number.
                 @memberof PersianCalendar */
                minMonth: 1,
                /** The first month in the year.
                 @memberof PersianCalendar */
                firstMonth: 1,
                /** The minimum day number.
                 @memberof PersianCalendar */
                minDay: 1,
                /** Localisations for the plugin.
                 Entries are objects indexed by the language code ('' being the default US/English).
                 Each object has the following attributes.
                 @memberof PersianCalendar
                 @property name {string} The calendar name.
                 @property epochs {string[]} The epoch names.
                 @property monthNames {string[]} The long names of the months of the year.
                 @property monthNamesShort {string[]} The short names of the months of the year.
                 @property dayNames {string[]} The long names of the days of the week.
                 @property dayNamesShort {string[]} The short names of the days of the week.
                 @property dayNamesMin {string[]} The minimal names of the days of the week.
                 @property dateFormat {string} The date format for this calendar.
                 See the options on <a href="BaseCalendar.html#formatDate"><code>formatDate</code></a> for details.
                 @property firstDay {number} The number of the first day of the week, starting at 0.
                 @property isRTL {number} <code>true</code> if this localisation reads right-to-left. */
                regionalOptions: {// Localisations
                    '': {
                        name: 'Persian',
                        epochs: ['BP', 'AP'],
                        monthNames: ['Farvardin', 'Ordibehesht', 'Khordad', 'Tir', 'Mordad', 'Shahrivar',
                            'Mehr', 'Aban', 'Azar', 'Day', 'Bahman', 'Esfand'],
                        monthNamesShort: ['Far', 'Ord', 'Kho', 'Tir', 'Mor', 'Sha', 'Meh', 'Aba', 'Aza', 'Day', 'Bah', 'Esf'],
                        dayNames: ['Yekshambe', 'Doshambe', 'Seshambe', 'Chæharshambe', 'Panjshambe', 'Jom\'e', 'Shambe'],
                        dayNamesShort: ['Yek', 'Do', 'Se', 'Chæ', 'Panj', 'Jom', 'Sha'],
                        dayNamesMin: ['Ye', 'Do', 'Se', 'Ch', 'Pa', 'Jo', 'Sh'],
                        dateFormat: 'yyyy/mm/dd',
                        firstDay: 6,
                        isRTL: false
                    }
                },
                /** Determine whether this date is in a leap year.
                 @memberof PersianCalendar
                 @param year {CDate|number} The date to examine or the year to examine.
                 @return {boolean} <code>true</code> if this is a leap year, <code>false</code> if not.
                 @throws Error if an invalid year or a different calendar used. */
                leapYear: function (year) {
                    var date = this._validate(year, this.minMonth, this.minDay, $.calendars.local.invalidYear);
                    return (((((date.year() - (date.year() > 0 ? 474 : 473)) % 2820) +
                            474 + 38) * 682) % 2816) < 682;
                },
                /** Determine the week of the year for a date.
                 @memberof PersianCalendar
                 @param year {CDate|number} The date to examine or the year to examine.
                 @param [month] {number} The month to examine.
                 @param [day] {number} The day to examine.
                 @return {number} The week of the year.
                 @throws Error if an invalid date or a different calendar used. */
                weekOfYear: function (year, month, day) {
                    // Find Saturday of this week starting on Saturday
                    var checkDate = this.newDate(year, month, day);
                    checkDate.add(-((checkDate.dayOfWeek() + 1) % 7), 'd');
                    return Math.floor((checkDate.dayOfYear() - 1) / 7) + 1;
                },
                /** Retrieve the number of days in a month.
                 @memberof PersianCalendar
                 @param year {CDate|number} The date to examine or the year of the month.
                 @param [month] {number} The month.
                 @return {number} The number of days in this month.
                 @throws Error if an invalid month/year or a different calendar used. */
                daysInMonth: function (year, month) {
                    var date = this._validate(year, month, this.minDay, $.calendars.local.invalidMonth);
                    return this.daysPerMonth[date.month() - 1] +
                            (date.month() === 12 && this.leapYear(date.year()) ? 1 : 0);
                },
                /** Determine whether this date is a week day.
                 @memberof PersianCalendar
                 @param year {CDate|number} The date to examine or the year to examine.
                 @param [month] {number} The month to examine.
                 @param [day] {number} The day to examine.
                 @return {boolean} <code>true</code> if a week day, <code>false</code> if not.
                 @throws Error if an invalid date or a different calendar used. */
                weekDay: function (year, month, day) {
                    return this.dayOfWeek(year, month, day) !== 5;
                },
                /** Retrieve the Julian date equivalent for this date,
                 i.e. days since January 1, 4713 BCE Greenwich noon.
                 @memberof PersianCalendar
                 @param year {CDate|number} The date to convert or the year to convert.
                 @param [month] {number} The month to convert.
                 @param [day] {number} The day to convert.
                 @return {number} The equivalent Julian date.
                 @throws Error if an invalid date or a different calendar used. */
                toJD: function (year, month, day) {
                    var date = this._validate(year, month, day, $.calendars.local.invalidDate);
                    year = date.year();
                    month = date.month();
                    day = date.day();
                    var epBase = year - (year >= 0 ? 474 : 473);
                    var epYear = 474 + mod(epBase, 2820);
                    return day + (month <= 7 ? (month - 1) * 31 : (month - 1) * 30 + 6) +
                            Math.floor((epYear * 682 - 110) / 2816) + (epYear - 1) * 365 +
                            Math.floor(epBase / 2820) * 1029983 + this.jdEpoch - 1;
                },
                /** Create a new date from a Julian date.
                 @memberof PersianCalendar
                 @param jd {number} The Julian date to convert.
                 @return {CDate} The equivalent date. */
                fromJD: function (jd) {
                    jd = Math.floor(jd) + 0.5;
                    var depoch = jd - this.toJD(475, 1, 1);
                    var cycle = Math.floor(depoch / 1029983);
                    var cyear = mod(depoch, 1029983);
                    var ycycle = 2820;
                    if (cyear !== 1029982) {
                        var aux1 = Math.floor(cyear / 366);
                        var aux2 = mod(cyear, 366);
                        ycycle = Math.floor(((2134 * aux1) + (2816 * aux2) + 2815) / 1028522) + aux1 + 1;
                    }
                    var year = ycycle + (2820 * cycle) + 474;
                    year = (year <= 0 ? year - 1 : year);
                    var yday = jd - this.toJD(year, 1, 1) + 1;
                    var month = (yday <= 186 ? Math.ceil(yday / 31) : Math.ceil((yday - 6) / 30));
                    var day = jd - this.toJD(year, month, 1) + 1;
                    return this.newDate(year, month, day);
                }
            });

            // Modulus function which works for non-integers.
            function mod(a, b) {
                return a - (b * Math.floor(a / b));
            }

            // Persian (Jalali) calendar implementation
            $.calendars.calendars.persian = PersianCalendar;
            $.calendars.calendars.jalali = PersianCalendar;

        })(jQuery);