dojo.provide("dojo.date.locale");

// Localization methods for Date.   Honor local customs using locale-dependent dojo.cldr data.

dojo.require("dojo.date");
dojo.require("dojo.cldr.supplemental");
dojo.require("dojo.regexp");
dojo.require("dojo.string");
dojo.require("dojo.i18n");

// Load the bundles containing localization information for
// names and formats
dojo.requireLocalization("dojo.cldr", "gregorian");

//NOTE: Everything in this module assumes Gregorian calendars.
// Other calendars will be implemented in separate modules.

(function(){
	// Format a pattern without literals
	function formatPattern(dateObject, bundle, options, pattern){
		return pattern.replace(/([a-z])\1*/ig, function(match){
			var s, pad,
				c = match.charAt(0),
				l = match.length,
				widthList = ["abbr", "wide", "narrow"];
			switch(c){
				case 'G':
					s = bundle[(l < 4) ? "eraAbbr" : "eraNames"][dateObject.getFullYear() < 0 ? 0 : 1];
					break;
				case 'y':
					s = dateObject.getFullYear();
					switch(l){
						case 1:
							break;
						case 2:
							if(!options.fullYear){
								s = String(s); s = s.substr(s.length - 2);
								break;
							}
							// fallthrough
						default:
							pad = true;
					}
					break;
				case 'Q':
				case 'q':
					s = Math.ceil((dateObject.getMonth()+1)/3);
//					switch(l){
//						case 1: case 2:
							pad = true;
//							break;
//						case 3: case 4: // unimplemented
//					}
					break;
				case 'M':
					var m = dateObject.getMonth();
					if(l<3){
						s = m+1; pad = true;
					}else{
						var propM = ["months", "format", widthList[l-3]].join("-");
						s = bundle[propM][m];
					}
					break;
				case 'w':
					var firstDay = 0;
					s = dojo.date.locale._getWeekOfYear(dateObject, firstDay); pad = true;
					break;
				case 'd':
					s = dateObject.getDate(); pad = true;
					break;
				case 'D':
					s = dojo.date.locale._getDayOfYear(dateObject); pad = true;
					break;
				case 'E':
					var d = dateObject.getDay();
					if(l<3){
						s = d+1; pad = true;
					}else{
						var propD = ["days", "format", widthList[l-3]].join("-");
						s = bundle[propD][d];
					}
					break;
				case 'a':
					var timePeriod = (dateObject.getHours() < 12) ? 'am' : 'pm';
					s = options[timePeriod] || bundle['dayPeriods-format-wide-' + timePeriod];
					break;
				case 'h':
				case 'H':
				case 'K':
				case 'k':
					var h = dateObject.getHours();
					// strange choices in the date format make it impossible to write this succinctly
					switch (c){
						case 'h': // 1-12
							s = (h % 12) || 12;
							break;
						case 'H': // 0-23
							s = h;
							break;
						case 'K': // 0-11
							s = (h % 12);
							break;
						case 'k': // 1-24
							s = h || 24;
							break;
					}
					pad = true;
					break;
				case 'm':
					s = dateObject.getMinutes(); pad = true;
					break;
				case 's':
					s = dateObject.getSeconds(); pad = true;
					break;
				case 'S':
					s = Math.round(dateObject.getMilliseconds() * Math.pow(10, l-3)); pad = true;
					break;
				case 'v': // FIXME: don't know what this is. seems to be same as z?
				case 'z':
					// We only have one timezone to offer; the one from the browser
					s = dojo.date.locale._getZone(dateObject, true, options);
					if(s){break;}
					l=4;
					// fallthrough... use GMT if tz not available
				case 'Z':
					var offset = dojo.date.locale._getZone(dateObject, false, options);
					var tz = [
						(offset<=0 ? "+" : "-"),
						dojo.string.pad(Math.floor(Math.abs(offset)/60), 2),
						dojo.string.pad(Math.abs(offset)% 60, 2)
					];
					if(l==4){
						tz.splice(0, 0, "GMT");
						tz.splice(3, 0, ":");
					}
					s = tz.join("");
					break;
//				case 'Y': case 'u': case 'W': case 'F': case 'g': case 'A': case 'e':
//					console.log(match+" modifier unimplemented");
				default:
					throw new Error("dojo.date.locale.format: invalid pattern char: "+pattern);
			}
			if(pad){ s = dojo.string.pad(s, l); }
			return s;
		});
	}

/*=====
	dojo.date.locale.__FormatOptions = function(){
	//	selector: String
	//		choice of 'time','date' (default: date and time)
	//	formatLength: String
	//		choice of long, short, medium or full (plus any custom additions).  Defaults to 'short'
	//	datePattern:String
	//		override pattern with this string
	//	timePattern:String
	//		override pattern with this string
	//	am: String
	//		override strings for am in times
	//	pm: String
	//		override strings for pm in times
	//	locale: String
	//		override the locale used to determine formatting rules
	//	fullYear: Boolean
	//		(format only) use 4 digit years whenever 2 digit years are called for
	//	strict: Boolean
	//		(parse only) strict parsing, off by default
		this.selector = selector;
		this.formatLength = formatLength;
		this.datePattern = datePattern;
		this.timePattern = timePattern;
		this.am = am;
		this.pm = pm;
		this.locale = locale;
		this.fullYear = fullYear;
		this.strict = strict;
	}
=====*/

dojo.date.locale._getZone = function(/*Date*/dateObject, /*boolean*/getName, /*dojo.date.locale.__FormatOptions?*/options){
	// summary:
	//		Returns the zone (or offset) for the given date and options.  This
	//		is broken out into a separate function so that it can be overridden
	//		by timezone-aware code.
	//
	// dateObject:
	//		the date and/or time being formatted.
	//
	// getName:
	//		Whether to return the timezone string (if true), or the offset (if false)
	//
	// options:
	//		The options being used for formatting
	if(getName){
		return dojo.date.getTimezoneName(dateObject);
	}else{
		return dateObject.getTimezoneOffset();
	}
};


dojo.date.locale.format = function(/*Date*/dateObject, /*dojo.date.locale.__FormatOptions?*/options){
	// summary:
	//		Format a Date object as a String, using locale-specific settings.
	//
	// description:
	//		Create a string from a Date object using a known localized pattern.
	//		By default, this method formats both date and time from dateObject.
	//		Formatting patterns are chosen appropriate to the locale.  Different
	//		formatting lengths may be chosen, with "full" used by default.
	//		Custom patterns may be used or registered with translations using
	//		the dojo.date.locale.addCustomFormats method.
	//		Formatting patterns are implemented using [the syntax described at
	//		unicode.org](http://www.unicode.org/reports/tr35/tr35-4.html#Date_Format_Patterns)
	//
	// dateObject:
	//		the date and/or time to be formatted.  If a time only is formatted,
	//		the values in the year, month, and day fields are irrelevant.  The
	//		opposite is true when formatting only dates.

	options = options || {};

	var locale = dojo.i18n.normalizeLocale(options.locale),
		formatLength = options.formatLength || 'short',
		bundle = dojo.date.locale._getGregorianBundle(locale),
		str = [],
		sauce = dojo.hitch(this, formatPattern, dateObject, bundle, options);
	if(options.selector == "year"){
		return _processPattern(bundle["dateFormatItem-yyyy"] || "yyyy", sauce);
	}
	var pattern;
	if(options.selector != "date"){
		pattern = options.timePattern || bundle["timeFormat-"+formatLength];
		if(pattern){str.push(_processPattern(pattern, sauce));}
	}
	if(options.selector != "time"){
		pattern = options.datePattern || bundle["dateFormat-"+formatLength];
		if(pattern){str.push(_processPattern(pattern, sauce));}
	}

	return str.length == 1 ? str[0] : bundle["dateTimeFormat-"+formatLength].replace(/\{(\d+)\}/g,
		function(match, key){ return str[key]; }); // String
};

dojo.date.locale.regexp = function(/*dojo.date.locale.__FormatOptions?*/options){
	// summary:
	//		Builds the regular needed to parse a localized date

	return dojo.date.locale._parseInfo(options).regexp; // String
};

dojo.date.locale._parseInfo = function(/*dojo.date.locale.__FormatOptions?*/options){
	options = options || {};
	var locale = dojo.i18n.normalizeLocale(options.locale),
		bundle = dojo.date.locale._getGregorianBundle(locale),
		formatLength = options.formatLength || 'short',
		datePattern = options.datePattern || bundle["dateFormat-" + formatLength],
		timePattern = options.timePattern || bundle["timeFormat-" + formatLength],
		pattern;
	if(options.selector == 'date'){
		pattern = datePattern;
	}else if(options.selector == 'time'){
		pattern = timePattern;
	}else{
		pattern = bundle["dateTimeFormat-"+formatLength].replace(/\{(\d+)\}/g,
			function(match, key){ return [timePattern, datePattern][key]; });
	}

	var tokens = [],
		re = _processPattern(pattern, dojo.hitch(this, _buildDateTimeRE, tokens, bundle, options));
	return {regexp: re, tokens: tokens, bundle: bundle};
};

dojo.date.locale.parse = function(/*String*/value, /*dojo.date.locale.__FormatOptions?*/options){
	// summary:
	//		Convert a properly formatted string to a primitive Date object,
	//		using locale-specific settings.
	//
	// description:
	//		Create a Date object from a string using a known localized pattern.
	//		By default, this method parses looking for both date and time in the string.
	//		Formatting patterns are chosen appropriate to the locale.  Different
	//		formatting lengths may be chosen, with "full" used by default.
	//		Custom patterns may be used or registered with translations using
	//		the dojo.date.locale.addCustomFormats method.
	//	
	//		Formatting patterns are implemented using [the syntax described at
	//		unicode.org](http://www.unicode.org/reports/tr35/tr35-4.html#Date_Format_Patterns)
	//		When two digit years are used, a century is chosen according to a sliding 
	//		window of 80 years before and 20 years after present year, for both `yy` and `yyyy` patterns.
	//		year < 100CE requires strict mode.
	//
	// value:
	//		A string representation of a date

	// remove non-printing bidi control chars from input and pattern
	var controlChars = /[\u200E\u200F\u202A\u202E]/g,
		info = dojo.date.locale._parseInfo(options),
		tokens = info.tokens, bundle = info.bundle,
		re = new RegExp("^" + info.regexp.replace(controlChars, "") + "$",
			info.strict ? "" : "i"),
		match = re.exec(value && value.replace(controlChars, ""));

	if(!match){ return null; } // null

	var widthList = ['abbr', 'wide', 'narrow'],
		result = [1970,0,1,0,0,0,0], // will get converted to a Date at the end
		amPm = "",
		valid = dojo.every(match, function(v, i){
		if(!i){return true;}
		var token=tokens[i-1];
		var l=token.length;
		switch(token.charAt(0)){
			case 'y':
				if(l != 2 && options.strict){
					//interpret year literally, so '5' would be 5 A.D.
					result[0] = v;
				}else{
					if(v<100){
						v = Number(v);
						//choose century to apply, according to a sliding window
						//of 80 years before and 20 years after present year
						var year = '' + new Date().getFullYear(),
							century = year.substring(0, 2) * 100,
							cutoff = Math.min(Number(year.substring(2, 4)) + 20, 99),
							num = (v < cutoff) ? century + v : century - 100 + v;
						result[0] = num;
					}else{
						//we expected 2 digits and got more...
						if(options.strict){
							return false;
						}
						//interpret literally, so '150' would be 150 A.D.
						//also tolerate '1950', if 'yyyy' input passed to 'yy' format
						result[0] = v;
					}
				}
				break;
			case 'M':
				if(l>2){
					var months = bundle['months-format-' + widthList[l-3]].concat();
					if(!options.strict){
						//Tolerate abbreviating period in month part
						//Case-insensitive comparison
						v = v.replace(".","").toLowerCase();
						months = dojo.map(months, function(s){ return s.replace(".","").toLowerCase(); } );
					}
					v = dojo.indexOf(months, v);
					if(v == -1){
//						console.log("dojo.date.locale.parse: Could not parse month name: '" + v + "'.");
						return false;
					}
				}else{
					v--;
				}
				result[1] = v;
				break;
			case 'E':
			case 'e':
				var days = bundle['days-format-' + widthList[l-3]].concat();
				if(!options.strict){
					//Case-insensitive comparison
					v = v.toLowerCase();
					days = dojo.map(days, function(d){return d.toLowerCase();});
				}
				v = dojo.indexOf(days, v);
				if(v == -1){
//					console.log("dojo.date.locale.parse: Could not parse weekday name: '" + v + "'.");
					return false;
				}

				//TODO: not sure what to actually do with this input,
				//in terms of setting something on the Date obj...?
				//without more context, can't affect the actual date
				//TODO: just validate?
				break;
			case 'D':
				result[1] = 0;
				// fallthrough...
			case 'd':
				result[2] = v;
				break;
			case 'a': //am/pm
				var am = options.am || bundle['dayPeriods-format-wide-am'],
					pm = options.pm || bundle['dayPeriods-format-wide-pm'];
				if(!options.strict){
					var period = /\./g;
					v = v.replace(period,'').toLowerCase();
					am = am.replace(period,'').toLowerCase();
					pm = pm.replace(period,'').toLowerCase();
				}
				if(options.strict && v != am && v != pm){
//					console.log("dojo.date.locale.parse: Could not parse am/pm part.");
					return false;
				}

				// we might not have seen the hours field yet, so store the state and apply hour change later
				amPm = (v == pm) ? 'p' : (v == am) ? 'a' : '';
				break;
			case 'K': //hour (1-24)
				if(v == 24){ v = 0; }
				// fallthrough...
			case 'h': //hour (1-12)
			case 'H': //hour (0-23)
			case 'k': //hour (0-11)
				//TODO: strict bounds checking, padding
				if(v > 23){
//					console.log("dojo.date.locale.parse: Illegal hours value");
					return false;
				}

				//in the 12-hour case, adjusting for am/pm requires the 'a' part
				//which could come before or after the hour, so we will adjust later
				result[3] = v;
				break;
			case 'm': //minutes
				result[4] = v;
				break;
			case 's': //seconds
				result[5] = v;
				break;
			case 'S': //milliseconds
				result[6] = v;
//				break;
//			case 'w':
//TODO				var firstDay = 0;
//			default:
//TODO: throw?
//				console.log("dojo.date.locale.parse: unsupported pattern char=" + token.charAt(0));
		}
		return true;
	});

	var hours = +result[3];
	if(amPm === 'p' && hours < 12){
		result[3] = hours + 12; //e.g., 3pm -> 15
	}else if(amPm === 'a' && hours == 12){
		result[3] = 0; //12am -> 0
	}

	//TODO: implement a getWeekday() method in order to test 
	//validity of input strings containing 'EEE' or 'EEEE'...

	var dateObject = new Date(result[0], result[1], result[2], result[3], result[4], result[5], result[6]); // Date
	if(options.strict){
		dateObject.setFullYear(result[0]);
	}

	// Check for overflow.  The Date() constructor normalizes things like April 32nd...
	//TODO: why isn't this done for times as well?
	var allTokens = tokens.join(""),
		dateToken = allTokens.indexOf('d') != -1,
		monthToken = allTokens.indexOf('M') != -1;

	if(!valid ||
		(monthToken && dateObject.getMonth() > result[1]) ||
		(dateToken && dateObject.getDate() > result[2])){
		return null;
	}

	// Check for underflow, due to DST shifts.  See #9366
	// This assumes a 1 hour dst shift correction at midnight
	// We could compare the timezone offset after the shift and add the difference instead.
	if((monthToken && dateObject.getMonth() < result[1]) ||
		(dateToken && dateObject.getDate() < result[2])){
		dateObject = dojo.date.add(dateObject, "hour", 1);
	}

	return dateObject; // Date
};

function _processPattern(pattern, applyPattern, applyLiteral, applyAll){
	//summary: Process a pattern with literals in it

	// Break up on single quotes, treat every other one as a literal, except '' which becomes '
	var identity = function(x){return x;};
	applyPattern = applyPattern || identity;
	applyLiteral = applyLiteral || identity;
	applyAll = applyAll || identity;

	//split on single quotes (which escape literals in date format strings) 
	//but preserve escaped single quotes (e.g., o''clock)
	var chunks = pattern.match(/(''|[^'])+/g),
		literal = pattern.charAt(0) == "'";

	dojo.forEach(chunks, function(chunk, i){
		if(!chunk){
			chunks[i]='';
		}else{
			chunks[i]=(literal ? applyLiteral : applyPattern)(chunk.replace(/''/g, "'"));
			literal = !literal;
		}
	});
	return applyAll(chunks.join(''));
}

function _buildDateTimeRE(tokens, bundle, options, pattern){
	pattern = dojo.regexp.escapeString(pattern);
	if(!options.strict){ pattern = pattern.replace(" a", " ?a"); } // kludge to tolerate no space before am/pm
	return pattern.replace(/([a-z])\1*/ig, function(match){
		// Build a simple regexp.  Avoid captures, which would ruin the tokens list
		var s,
			c = match.charAt(0),
			l = match.length,
			p2 = '', p3 = '';
		if(options.strict){
			if(l > 1){ p2 = '0' + '{'+(l-1)+'}'; }
			if(l > 2){ p3 = '0' + '{'+(l-2)+'}'; }
		}else{
			p2 = '0?'; p3 = '0{0,2}';
		}
		switch(c){
			case 'y':
				s = '\\d{2,4}';
				break;
			case 'M':
				s = (l>2) ? '\\S+?' : p2+'[1-9]|1[0-2]';
				break;
			case 'D':
				s = p2+'[1-9]|'+p3+'[1-9][0-9]|[12][0-9][0-9]|3[0-5][0-9]|36[0-6]';
				break;
			case 'd':
				s = '3[01]|[12]\\d|'+p2+'[1-9]';
				break;
			case 'w':
				s = p2+'[1-9]|[1-4][0-9]|5[0-3]';
				break;
			case 'E':
				s = '\\S+';
				break;
			case 'h': //hour (1-12)
				s = p2+'[1-9]|1[0-2]';
				break;
			case 'k': //hour (0-11)
				s = p2+'\\d|1[01]';
				break;
			case 'H': //hour (0-23)
				s = p2+'\\d|1\\d|2[0-3]';
				break;
			case 'K': //hour (1-24)
				s = p2+'[1-9]|1\\d|2[0-4]';
				break;
			case 'm':
			case 's':
				s = '[0-5]\\d';
				break;
			case 'S':
				s = '\\d{'+l+'}';
				break;
			case 'a':
				var am = options.am || bundle['dayPeriods-format-wide-am'],
					pm = options.pm || bundle['dayPeriods-format-wide-pm'];
				if(options.strict){
					s = am + '|' + pm;
				}else{
					s = am + '|' + pm;
					if(am != am.toLowerCase()){ s += '|' + am.toLowerCase(); }
					if(pm != pm.toLowerCase()){ s += '|' + pm.toLowerCase(); }
					if(s.indexOf('.') != -1){ s += '|' + s.replace(/\./g, ""); }
				}
				s = s.replace(/\./g, "\\.");
				break;
			default:
			// case 'v':
			// case 'z':
			// case 'Z':
				s = ".*";
//				console.log("parse of date format, pattern=" + pattern);
		}

		if(tokens){ tokens.push(match); }

		return "(" + s + ")"; // add capture
	}).replace(/[\xa0 ]/g, "[\\s\\xa0]"); // normalize whitespace.  Need explicit handling of \xa0 for IE.
}
})();

(function(){
var _customFormats = [];
dojo.date.locale.addCustomFormats = function(/*String*/packageName, /*String*/bundleName){
	// summary:
	//		Add a reference to a bundle containing localized custom formats to be
	//		used by date/time formatting and parsing routines.
	//
	// description:
	//		The user may add custom localized formats where the bundle has properties following the
	//		same naming convention used by dojo.cldr: `dateFormat-xxxx` / `timeFormat-xxxx`
	//		The pattern string should match the format used by the CLDR.
	//		See dojo.date.locale.format() for details.
	//		The resources must be loaded by dojo.requireLocalization() prior to use

	_customFormats.push({pkg:packageName,name:bundleName});
};

dojo.date.locale._getGregorianBundle = function(/*String*/locale){
	var gregorian = {};
	dojo.forEach(_customFormats, function(desc){
		var bundle = dojo.i18n.getLocalization(desc.pkg, desc.name, locale);
		gregorian = dojo.mixin(gregorian, bundle);
	}, this);
	return gregorian; /*Object*/
};
})();

dojo.date.locale.addCustomFormats("dojo.cldr","gregorian");

dojo.date.locale.getNames = function(/*String*/item, /*String*/type, /*String?*/context, /*String?*/locale){
	// summary:
	//		Used to get localized strings from dojo.cldr for day or month names.
	//
	// item:
	//	'months' || 'days'
	// type:
	//	'wide' || 'narrow' || 'abbr' (e.g. "Monday", "Mon", or "M" respectively, in English)
	// context:
	//	'standAlone' || 'format' (default)
	// locale:
	//	override locale used to find the names

	var label,
		lookup = dojo.date.locale._getGregorianBundle(locale),
		props = [item, context, type];
	if(context == 'standAlone'){
		var key = props.join('-');
		label = lookup[key];
		// Fall back to 'format' flavor of name
		if(label[0] == 1){ label = undefined; } // kludge, in the absence of real aliasing support in dojo.cldr
	}
	props[1] = 'format';

	// return by copy so changes won't be made accidentally to the in-memory model
	return (label || lookup[props.join('-')]).concat(); /*Array*/
};

dojo.date.locale.isWeekend = function(/*Date?*/dateObject, /*String?*/locale){
	// summary:
	//	Determines if the date falls on a weekend, according to local custom.

	var weekend = dojo.cldr.supplemental.getWeekend(locale),
		day = (dateObject || new Date()).getDay();
	if(weekend.end < weekend.start){
		weekend.end += 7;
		if(day < weekend.start){ day += 7; }
	}
	return day >= weekend.start && day <= weekend.end; // Boolean
};

// These are used only by format and strftime.  Do they need to be public?  Which module should they go in?

dojo.date.locale._getDayOfYear = function(/*Date*/dateObject){
	// summary: gets the day of the year as represented by dateObject
	return dojo.date.difference(new Date(dateObject.getFullYear(), 0, 1, dateObject.getHours()), dateObject) + 1; // Number
};

dojo.date.locale._getWeekOfYear = function(/*Date*/dateObject, /*Number*/firstDayOfWeek){
	if(arguments.length == 1){ firstDayOfWeek = 0; } // Sunday

	var firstDayOfYear = new Date(dateObject.getFullYear(), 0, 1).getDay(),
		adj = (firstDayOfYear - firstDayOfWeek + 7) % 7,
		week = Math.floor((dojo.date.locale._getDayOfYear(dateObject) + adj - 1) / 7);

	// if year starts on the specified day, start counting weeks at 1
	if(firstDayOfYear == firstDayOfWeek){ week++; }

	return week; // Number
};
