/*
Copyright (c) 2009, Yahoo! Inc. All rights reserved.
Code licensed under the BSD License:
http://developer.yahoo.net/yui/license.txt
version: 3.0.0b1
build: 1163
*/
YUI.add('datatype-date-format', function(Y) {

/**
 * The DataType Utility provides type-conversion and string-formatting
 * convenience methods for various JavaScript object types.
 *
 * @module datatype
 */

/**
 * Date submodule.
 *
 * @module datatype
 * @submodule datatype-date
 */

/**
 * Format date submodule implements strftime formatters for javascript based on the
 * Open Group specification defined at
 * http://www.opengroup.org/onlinepubs/007908799/xsh/strftime.html
 * This implementation does not include modified conversion specifiers (i.e., Ex and Ox)
 *
 * @module datatype
 * @submodule datatype-date-format
 */

/**
 * DataType.Date provides a set of utility functions to operate against Date objects.
 *
 * @class DataType.Date
 * @static
 */

/**
 * Pad a number with leading spaces, zeroes or something else
 * @method xPad
 * @param x {Number}	The number to be padded
 * @param pad {String}  The character to pad the number with
 * @param r {Number}	(optional) The base of the pad, eg, 10 implies to two digits, 100 implies to 3 digits.
 * @private
 */
var xPad=function (x, pad, r)
{
	if(typeof r === "undefined")
	{
		r=10;
	}
	pad = pad.toString();
	for( ; parseInt(x, 10)<r && r>1; r/=10) {
		x = pad + x;
	}
	return x.toString();
};

/**
 * Default date format.
 *
 * @for config
 * @property dateFormat
 * @type String
 * @value "%Y-%m-%d"
 */
Y.config.dateFormat = Y.config.dateFormat || "%Y-%m-%d";

/**
 * Default locale for the YUI instance.
 *
 * @property locale
 * @type String
 * @value "en"
 */
Y.config.locale = Y.config.locale || "en";

var Dt = {
	formats: {
		a: function (d, l) { return l.a[d.getDay()]; },
		A: function (d, l) { return l.A[d.getDay()]; },
		b: function (d, l) { return l.b[d.getMonth()]; },
		B: function (d, l) { return l.B[d.getMonth()]; },
		C: function (d) { return xPad(parseInt(d.getFullYear()/100, 10), 0); },
		d: ["getDate", "0"],
		e: ["getDate", " "],
		g: function (d) { return xPad(parseInt(Dt.formats.G(d)%100, 10), 0); },
		G: function (d) {
				var y = d.getFullYear();
				var V = parseInt(Dt.formats.V(d), 10);
				var W = parseInt(Dt.formats.W(d), 10);
	
				if(W > V) {
					y++;
				} else if(W===0 && V>=52) {
					y--;
				}
	
				return y;
			},
		H: ["getHours", "0"],
		I: function (d) { var I=d.getHours()%12; return xPad(I===0?12:I, 0); },
		j: function (d) {
				var gmd_1 = new Date("" + d.getFullYear() + "/1/1 GMT");
				var gmdate = new Date("" + d.getFullYear() + "/" + (d.getMonth()+1) + "/" + d.getDate() + " GMT");
				var ms = gmdate - gmd_1;
				var doy = parseInt(ms/60000/60/24, 10)+1;
				return xPad(doy, 0, 100);
			},
		k: ["getHours", " "],
		l: function (d) { var I=d.getHours()%12; return xPad(I===0?12:I, " "); },
		m: function (d) { return xPad(d.getMonth()+1, 0); },
		M: ["getMinutes", "0"],
		p: function (d, l) { return l.p[d.getHours() >= 12 ? 1 : 0 ]; },
		P: function (d, l) { return l.P[d.getHours() >= 12 ? 1 : 0 ]; },
		s: function (d, l) { return parseInt(d.getTime()/1000, 10); },
		S: ["getSeconds", "0"],
		u: function (d) { var dow = d.getDay(); return dow===0?7:dow; },
		U: function (d) {
				var doy = parseInt(Dt.formats.j(d), 10);
				var rdow = 6-d.getDay();
				var woy = parseInt((doy+rdow)/7, 10);
				return xPad(woy, 0);
			},
		V: function (d) {
				var woy = parseInt(Dt.formats.W(d), 10);
				var dow1_1 = (new Date("" + d.getFullYear() + "/1/1")).getDay();
				// First week is 01 and not 00 as in the case of %U and %W,
				// so we add 1 to the final result except if day 1 of the year
				// is a Monday (then %W returns 01).
				// We also need to subtract 1 if the day 1 of the year is 
				// Friday-Sunday, so the resulting equation becomes:
				var idow = woy + (dow1_1 > 4 || dow1_1 <= 1 ? 0 : 1);
				if(idow === 53 && (new Date("" + d.getFullYear() + "/12/31")).getDay() < 4)
				{
					idow = 1;
				}
				else if(idow === 0)
				{
					idow = Dt.formats.V(new Date("" + (d.getFullYear()-1) + "/12/31"));
				}
	
				return xPad(idow, 0);
			},
		w: "getDay",
		W: function (d) {
				var doy = parseInt(Dt.formats.j(d), 10);
				var rdow = 7-Dt.formats.u(d);
				var woy = parseInt((doy+rdow)/7, 10);
				return xPad(woy, 0, 10);
			},
		y: function (d) { return xPad(d.getFullYear()%100, 0); },
		Y: "getFullYear",
		z: function (d) {
				var o = d.getTimezoneOffset();
				var H = xPad(parseInt(Math.abs(o/60), 10), 0);
				var M = xPad(Math.abs(o%60), 0);
				return (o>0?"-":"+") + H + M;
			},
		Z: function (d) {
			var tz = d.toString().replace(/^.*:\d\d( GMT[+-]\d+)? \(?([A-Za-z ]+)\)?\d*$/, "$2").replace(/[a-z ]/g, "");
			if(tz.length > 4) {
				tz = Dt.formats.z(d);
			}
			return tz;
		},
		"%": function (d) { return "%"; }
	},

	aggregates: {
		c: "locale",
		D: "%m/%d/%y",
		F: "%Y-%m-%d",
		h: "%b",
		n: "\n",
		r: "locale",
		R: "%H:%M",
		t: "\t",
		T: "%H:%M:%S",
		x: "locale",
		X: "locale"
		//"+": "%a %b %e %T %Z %Y"
	},

	 /**
	 * Takes a native JavaScript Date and formats it as a string for display to user.
	 *
	 * @for DataType.Date
	 * @method format
	 * @param oDate {Date} Date.
	 * @param oConfig {Object} (Optional) Object literal of configuration values:
	 *  <dl>
	 *   <dt>format {String} (Optional)</dt>
	 *   <dd>
	 *   <p>
	 *   Any strftime string is supported, such as "%I:%M:%S %p". strftime has several format specifiers defined by the Open group at 
	 *   <a href="http://www.opengroup.org/onlinepubs/007908799/xsh/strftime.html">http://www.opengroup.org/onlinepubs/007908799/xsh/strftime.html</a>
	 *   PHP added a few of its own, defined at <a href="http://www.php.net/strftime">http://www.php.net/strftime</a>
	 *   </p>
	 *   <p>
	 *   This javascript implementation supports all the PHP specifiers and a few more.  The full list is below.
	 *   </p>
	 *   <p>
	 *   If not specified, it defaults to the ISO8601 standard date format: %Y-%m-%d.  This may be overridden by changing Y.config.dateFormat
	 *   </p>
	 *   <dl>
	 *	<dt>%a</dt> <dd>abbreviated weekday name according to the current locale</dd>
	 *	<dt>%A</dt> <dd>full weekday name according to the current locale</dd>
	 *	<dt>%b</dt> <dd>abbreviated month name according to the current locale</dd>
	 *	<dt>%B</dt> <dd>full month name according to the current locale</dd>
	 *	<dt>%c</dt> <dd>preferred date and time representation for the current locale</dd>
	 *	<dt>%C</dt> <dd>century number (the year divided by 100 and truncated to an integer, range 00 to 99)</dd>
	 *	<dt>%d</dt> <dd>day of the month as a decimal number (range 01 to 31)</dd>
	 *	<dt>%D</dt> <dd>same as %m/%d/%y</dd>
	 *	<dt>%e</dt> <dd>day of the month as a decimal number, a single digit is preceded by a space (range " 1" to "31")</dd>
	 *	<dt>%F</dt> <dd>same as %Y-%m-%d (ISO 8601 date format)</dd>
	 *	<dt>%g</dt> <dd>like %G, but without the century</dd>
	 *	<dt>%G</dt> <dd>The 4-digit year corresponding to the ISO week number</dd>
	 *	<dt>%h</dt> <dd>same as %b</dd>
	 *	<dt>%H</dt> <dd>hour as a decimal number using a 24-hour clock (range 00 to 23)</dd>
	 *	<dt>%I</dt> <dd>hour as a decimal number using a 12-hour clock (range 01 to 12)</dd>
	 *	<dt>%j</dt> <dd>day of the year as a decimal number (range 001 to 366)</dd>
	 *	<dt>%k</dt> <dd>hour as a decimal number using a 24-hour clock (range 0 to 23); single digits are preceded by a blank. (See also %H.)</dd>
	 *	<dt>%l</dt> <dd>hour as a decimal number using a 12-hour clock (range 1 to 12); single digits are preceded by a blank. (See also %I.) </dd>
	 *	<dt>%m</dt> <dd>month as a decimal number (range 01 to 12)</dd>
	 *	<dt>%M</dt> <dd>minute as a decimal number</dd>
	 *	<dt>%n</dt> <dd>newline character</dd>
	 *	<dt>%p</dt> <dd>either "AM" or "PM" according to the given time value, or the corresponding strings for the current locale</dd>
	 *	<dt>%P</dt> <dd>like %p, but lower case</dd>
	 *	<dt>%r</dt> <dd>time in a.m. and p.m. notation equal to %I:%M:%S %p</dd>
	 *	<dt>%R</dt> <dd>time in 24 hour notation equal to %H:%M</dd>
	 *	<dt>%s</dt> <dd>number of seconds since the Epoch, ie, since 1970-01-01 00:00:00 UTC</dd>
	 *	<dt>%S</dt> <dd>second as a decimal number</dd>
	 *	<dt>%t</dt> <dd>tab character</dd>
	 *	<dt>%T</dt> <dd>current time, equal to %H:%M:%S</dd>
	 *	<dt>%u</dt> <dd>weekday as a decimal number [1,7], with 1 representing Monday</dd>
	 *	<dt>%U</dt> <dd>week number of the current year as a decimal number, starting with the
	 *			first Sunday as the first day of the first week</dd>
	 *	<dt>%V</dt> <dd>The ISO 8601:1988 week number of the current year as a decimal number,
	 *			range 01 to 53, where week 1 is the first week that has at least 4 days
	 *			in the current year, and with Monday as the first day of the week.</dd>
	 *	<dt>%w</dt> <dd>day of the week as a decimal, Sunday being 0</dd>
	 *	<dt>%W</dt> <dd>week number of the current year as a decimal number, starting with the
	 *			first Monday as the first day of the first week</dd>
	 *	<dt>%x</dt> <dd>preferred date representation for the current locale without the time</dd>
	 *	<dt>%X</dt> <dd>preferred time representation for the current locale without the date</dd>
	 *	<dt>%y</dt> <dd>year as a decimal number without a century (range 00 to 99)</dd>
	 *	<dt>%Y</dt> <dd>year as a decimal number including the century</dd>
	 *	<dt>%z</dt> <dd>numerical time zone representation</dd>
	 *	<dt>%Z</dt> <dd>time zone name or abbreviation</dd>
	 *	<dt>%%</dt> <dd>a literal "%" character</dd>
	 *   </dl>
	 *  </dd>
	 *  <dt>locale {String} (Optional)</dt>
	 *  <dd>
	 *   The locale to use when displaying days of week, months of the year, and other locale specific
	 *   strings. If not specified, this defaults to "en" (though this may be overridden by changing Y.config.locale).
	 *   The following locales are built in:
	 *   <dl>
	 *    <dt>en</dt>
	 *    <dd>English</dd>
	 *    <dt>en-US</dt>
	 *    <dd>US English</dd>
	 *    <dt>en-GB</dt>
	 *    <dd>British English</dd>
	 *    <dt>en-AU</dt>
	 *    <dd>Australian English (identical to British English)</dd>
	 *   </dl>
	 *   More locales may be added by subclassing of Y.DataType.Date.Locale["en"].
	 *   See Y.DataType.Date.Locale for more information.
	 *  </dd>
	 * </dl>
	 * @return {String} Formatted date for display.
	 */
	format : function (oDate, oConfig) {
		oConfig = oConfig || {};
		
		if(!Y.Lang.isDate(oDate)) {
			return Y.Lang.isValue(oDate) ? oDate : "";
		}

		var format = oConfig.format || Y.config.dateFormat,
			sLocale = oConfig.locale || Y.config.locale,
			LOCALE = Y.DataType.Date.Locale;

		sLocale = sLocale.replace(/_/g, "-");
		
		// Make sure we have a definition for the requested locale, or default to en.
		if(!LOCALE[sLocale]) {
			var tmpLocale = sLocale.replace(/-[a-zA-Z]+$/, "");
			if(tmpLocale in LOCALE) {
				sLocale = tmpLocale;
			} else if(Y.config.locale in LOCALE) {
				sLocale = Y.config.locale;
			} else {
				sLocale = "en";
			}
		}

		var aLocale = LOCALE[sLocale];

		var replace_aggs = function (m0, m1) {
			var f = Dt.aggregates[m1];
			return (f === "locale" ? aLocale[m1] : f);
		};

		var replace_formats = function (m0, m1) {
			var f = Dt.formats[m1];
			switch(Y.Lang.type(f)) {
				case "string":					// string => built in date function
					return oDate[f]();
				case "function":				// function => our own function
					return f.call(oDate, oDate, aLocale);
				case "array":					// built in function with padding
					if(Y.Lang.type(f[0]) === "string") {
						return xPad(oDate[f[0]](), f[1]);
					} // no break; (fall through to default:)
				default:
					return m1;
			}
		};

		// First replace aggregates (run in a loop because an agg may be made up of other aggs)
		while(format.match(/%[cDFhnrRtTxX]/)) {
			format = format.replace(/%([cDFhnrRtTxX])/g, replace_aggs);
		}

		// Now replace formats (do not run in a loop otherwise %%a will be replace with the value of %a)
		var str = format.replace(/%([aAbBCdegGHIjklmMpPsSuUVwWyYzZ%])/g, replace_formats);

		replace_aggs = replace_formats = undefined;

		return str;
	}
};

Y.mix(Y.namespace("DataType.Date"), Dt);

/**
 * @module datatype
*/

/**
 * The Date.Locale class is a container for all localised date strings
 * used by Y.DataType.Date. It is used internally, but may be extended
 * to provide new date localisations.
 *
 * To create your own Locale, follow these steps:
 * <ol>
 *  <li>Find an existing locale that matches closely with your needs</li>
 *  <li>Use this as your base class.  Use Y.DataType.Date.Locale["en"] if nothing
 *   matches.</li>
 *  <li>Create your own class as an extension of the base class using
 *   Y.merge, and add your own localisations where needed.</li>
 * </ol>
 * See the Y.DataType.Date.Locale["en-US"] and Y.DataType.Date.Locale["en-GB"]
 * classes which extend Y.DataType.Date.Locale["en"].
 *
 * For example, to implement locales for French french and Canadian french,
 * we would do the following:
 * <ol>
 *  <li>For French french, we have no existing similar locale, so use
 *   Y.DataType.Date.Locale["en"] as the base, and extend it:
 *   <pre>
 *      Y.DataType.Date.Locale["fr"] = Y.merge(Y.DataType.Date.Locale, {
 *          a: ["dim", "lun", "mar", "mer", "jeu", "ven", "sam"],
 *          A: ["dimanche", "lundi", "mardi", "mercredi", "jeudi", "vendredi", "samedi"],
 *          b: ["jan", "f&eacute;v", "mar", "avr", "mai", "jun", "jui", "ao&ucirc;", "sep", "oct", "nov", "d&eacute;c"],
 *          B: ["janvier", "f&eacute;vrier", "mars", "avril", "mai", "juin", "juillet", "ao&ucirc;t", "septembre", "octobre", "novembre", "d&eacute;cembre"],
 *          c: "%a %d %b %Y %T %Z",
 *          p: ["", ""],
 *          P: ["", ""],
 *          x: "%d.%m.%Y",
 *          X: "%T"
 *      });
 *   </pre>
 *  </li>
 *  <li>For Canadian french, we start with French french and change the meaning of \%x:
 *   <pre>
 *      Y.DataType.Date.Locale["fr-CA"] = Y.merge(Y.DataType.Date.Locale["fr"], {
 *          x: "%Y-%m-%d"
 *      });
 *   </pre>
 *  </li>
 * </ol>
 *
 * With that, you can use your new locales:
 * <pre>
 *    var d = new Date("2008/04/22");
 *    Y.DataType.Date.format(d, { format: "%A, %d %B == %x", locale: "fr" });
 * </pre>
 * will return:
 * <pre>
 *    mardi, 22 avril == 22.04.2008
 * </pre>
 * And
 * <pre>
 *    Y.DataType.Date.format(d, {format: "%A, %d %B == %x", locale: "fr-CA" });
 * </pre>
 * Will return:
 * <pre>
 *   mardi, 22 avril == 2008-04-22
 * </pre>
 * @requires oop
 * @class DataType.Date.Locale
 * @static
 */
var YDateEn = {
	a: ["Sun", "Mon", "Tue", "Wed", "Thu", "Fri", "Sat"],
	A: ["Sunday", "Monday", "Tuesday", "Wednesday", "Thursday", "Friday", "Saturday"],
	b: ["Jan", "Feb", "Mar", "Apr", "May", "Jun", "Jul", "Aug", "Sep", "Oct", "Nov", "Dec"],
	B: ["January", "February", "March", "April", "May", "June", "July", "August", "September", "October", "November", "December"],
	c: "%a %d %b %Y %T %Z",
	p: ["AM", "PM"],
	P: ["am", "pm"],
	r: "%I:%M:%S %p",
	x: "%d/%m/%y",
	X: "%T"
};

Y.namespace("DataType.Date.Locale");

Y.DataType.Date.Locale["en"] = YDateEn;

Y.DataType.Date.Locale["en-US"] = Y.merge(YDateEn, {
	c: "%a %d %b %Y %I:%M:%S %p %Z",
	x: "%m/%d/%Y",
	X: "%I:%M:%S %p"
});

Y.DataType.Date.Locale["en-GB"] = Y.merge(YDateEn, {
	r: "%l:%M:%S %P %Z"
});
Y.DataType.Date.Locale["en-AU"] = Y.merge(YDateEn);





}, '3.0.0b1' );
