/* http://keith-wood.name/calendars.html
 Islamic 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 Islamic or '16 civil' 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/Islamic_calendar">http://en.wikipedia.org/wiki/Islamic_calendar</a>.
             @class IslamicCalendar
             @param [language=''] {string} The language code (default English) for localisation. */
            function IslamicCalendar(language) {
                this.local = this.regionalOptions[language || ''] || this.regionalOptions[''];
            }

            IslamicCalendar.prototype = new $.calendars.baseCalendar;

            $.extend(IslamicCalendar.prototype, {
                /** The calendar name.
                 @memberof IslamicCalendar */
                name: 'Islamic',
                /** Julian date of start of Islamic epoch: 16 July 622 CE.
                 @memberof IslamicCalendar */
                jdEpoch: 1948439.5,
                /** Days per month in a common year.
                 @memberof IslamicCalendar */
                daysPerMonth: [30, 29, 30, 29, 30, 29, 30, 29, 30, 29, 30, 29],
                /** <code>true</code> if has a year zero, <code>false</code> if not.
                 @memberof IslamicCalendar */
                hasYearZero: false,
                /** The minimum month number.
                 @memberof IslamicCalendar */
                minMonth: 1,
                /** The first month in the year.
                 @memberof IslamicCalendar */
                firstMonth: 1,
                /** The minimum day number.
                 @memberof IslamicCalendar */
                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 IslamicCalendar
                 @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: 'Islamic',
                        epochs: ['BH', 'AH'],
                        monthNames: ['Muharram', 'Safar', 'Rabi\' al-awwal', 'Rabi\' al-thani', 'Jumada al-awwal', 'Jumada al-thani',
                            'Rajab', 'Sha\'aban', 'Ramadan', 'Shawwal', 'Dhu al-Qi\'dah', 'Dhu al-Hijjah'],
                        monthNamesShort: ['Muh', 'Saf', 'Rab1', 'Rab2', 'Jum1', 'Jum2', 'Raj', 'Sha\'', 'Ram', 'Shaw', 'DhuQ', 'DhuH'],
                        dayNames: ['Yawm al-ahad', 'Yawm al-ithnayn', 'Yawm ath-thulaathaa\'',
                            'Yawm al-arbi\'aa\'', 'Yawm al-khamīs', 'Yawm al-jum\'a', 'Yawm as-sabt'],
                        dayNamesShort: ['Aha', 'Ith', 'Thu', 'Arb', 'Kha', 'Jum', 'Sab'],
                        dayNamesMin: ['Ah', 'It', 'Th', 'Ar', 'Kh', 'Ju', 'Sa'],
                        dateFormat: 'yyyy/mm/dd',
                        firstDay: 6,
                        isRTL: false
                    }
                },
                /** Determine whether this date is in a leap year.
                 @memberof IslamicCalendar
                 @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() * 11 + 14) % 30 < 11;
                },
                /** Determine the week of the year for a date.
                 @memberof IslamicCalendar
                 @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 Sunday of this week starting on Sunday
                    var checkDate = this.newDate(year, month, day);
                    checkDate.add(-checkDate.dayOfWeek(), 'd');
                    return Math.floor((checkDate.dayOfYear() - 1) / 7) + 1;
                },
                /** Retrieve the number of days in a year.
                 @memberof IslamicCalendar
                 @param year {CDate|number} The date to examine or the year to examine.
                 @return {number} The number of days.
                 @throws Error if an invalid year or a different calendar used. */
                daysInYear: function (year) {
                    return (this.leapYear(year) ? 355 : 354);
                },
                /** Retrieve the number of days in a month.
                 @memberof IslamicCalendar
                 @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 IslamicCalendar
                 @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 IslamicCalendar
                 @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();
                    year = (year <= 0 ? year + 1 : year);
                    return day + Math.ceil(29.5 * (month - 1)) + (year - 1) * 354 +
                            Math.floor((3 + (11 * year)) / 30) + this.jdEpoch - 1;
                },
                /** Create a new date from a Julian date.
                 @memberof IslamicCalendar
                 @param jd {number} The Julian date to convert.
                 @return {CDate} The equivalent date. */
                fromJD: function (jd) {
                    jd = Math.floor(jd) + 0.5;
                    var year = Math.floor((30 * (jd - this.jdEpoch) + 10646) / 10631);
                    year = (year <= 0 ? year - 1 : year);
                    var month = Math.min(12, Math.ceil((jd - 29 - this.toJD(year, 1, 1)) / 29.5) + 1);
                    var day = jd - this.toJD(year, month, 1) + 1;
                    return this.newDate(year, month, day);
                }
            });

            // Islamic (16 civil) calendar implementation
            $.calendars.calendars.islamic = IslamicCalendar;

        })(jQuery);