/*
    Microformats ISO Date Normalisation 0.1
    Author: Glenn Jones
    
	The MIT License
	
	Copyright (c) 2008 Glenn Jones
	
	Permission is hereby granted, free of charge, to any person obtaining a copy
	of this software and associated documentation files (the "Software"), to deal
	in the Software without restriction, including without limitation the rights
	to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
	copies of the Software, and to permit persons to whom the Software is
	furnished to do so, subject to the following conditions:
	
	The above copyright notice and this permission notice shall be included in
	all copies or substantial portions of the Software.
	
	THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
	IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
	FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
	AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
	LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
	OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
	THE SOFTWARE.
	
	This feature only deal with ISO 8601 subsets 
	W3C Note datetime profile - http://www.w3.org/TR/NOTE-datetime
	RFC 3339 profile - http://www.ietf.org/rfc/rfc3339.txt  
	
*/




function ISODate() {
	this.dY;
	this.dM=-1; 
	this.dD=-1;
	this.z=false;
	this.tH;
	this.tM=-1;
	this.tS=-1;
	this.tD=-1;
	this.tzH;
	this.tzM=-1;
	this.tzPN='+';
	this.z = false;
	this.format = 'W3C' // W3C or RFC3339
	
	if(arguments[0])
		this.Parse( arguments[0] );
}

ISODate.prototype.Parse = function( dateString ) {
	
	var dateNormalised = '', parts;
	var datePart = '', timePart = '', timeZonePart = '';
	dateString = dateString.toUpperCase();

	
	// Break on 'T' divider or space
	if( dateString.indexOf('T') > -1 )
	{
		parts = dateString.split('T');		
		datePart = parts[0];
		timePart = parts[1];
		
		// Zulu UTC and time zone break
		if( timePart.indexOf('Z') > -1 || timePart.indexOf('+') > -1 || timePart.indexOf('-') > -1 )
		{
			var tzArray = timePart.split('Z');
			timePart = tzArray[0];
			timeZonePart = tzArray[1];
			this.z = true;
			
			// Timezone
			if( timePart.indexOf('+') > -1 || timePart.indexOf('-') > -1 )
			{
				var position = 0;
				if( timePart.indexOf('+') > -1 )
					position = timePart.indexOf('+');
				else
					position = timePart.indexOf('-');
				
				timeZonePart = timePart.substring(position,timePart.length);
				timePart = timePart.substring(0,position);
			}
		}
		
	}
	else
	{
		datePart = dateString;
	}
	
	if( datePart != '' ) {
		this.ParseDate( datePart );
		if( timePart != '' ){
			this.ParseTime( timePart );
			if( timeZonePart != '' ){
				this.ParseTimeZone( timeZonePart );
			}
		}
	}	
}


ISODate.prototype.ParseDate = function( dateString ) {
	var dateNormalised = '', parts;
	// YYYY-MM-DD ie 2008-05-01 and YYYYMMDD ie 20080501
	parts = dateString.match(/(\d\d\d\d)?-?(\d\d)?-?(\d\d)?/);
	if( parts[1] ) { this.dY = parts[1] };
	if( parts[2] ) { this.dM = parts[2] };
	if( parts[3] ) { this.dD = parts[3] };
}

ISODate.prototype.ParseTime = function( timeString ) {
	var timeNormalised = '';
	// Finds timezone HH:MM:SS and HHMMSS  ie 13:30:45, 133045 and 13:30:45.0135
	var parts = timeString.match(/(\d\d)?:?(\d\d)?:?(\d\d)?.?([0-9]+)?/);
	timeSegment = timeString;
	if( parts[1] ) { this.tH = parts[1] };
	if( parts[2] ) { this.tM = parts[2] };
	if( parts[3] ) { this.tS = parts[3] };
	if( parts[4] ) { this.tD = parts[4] };
}

ISODate.prototype.ParseTimeZone = function( timeString ) {
	var timeNormalised = '';
	// Finds timezone +HH:MM and +HHMM  ie +13:30 and +1330
	var parts = timeString.match(/([-+]{1})?(\d\d)?:?(\d\d)?/);
	if( parts[1] ) { this.tzPN = parts[1] };
	if( parts[2] ) { this.tzH = parts[2] };
	if( parts[3] ) { this.tzM = parts[3] };
}

// Returns datetime in W3C Note datetime profile or RFC 3339 profile
ISODate.prototype.toString = function() {
	if(this.format == 'W3C') {
		dsep = '-';
		tsep = ':';
	}
	if(this.format == 'RFC3339') {
		dsep = '';
		tsep = '';
	}
	
	var output='';
	if( typeof( this.dY ) != 'undefined' ){			
		output = this.dY;
		if( this.dM > 0 && this.dM < 13  ){ 
			output += dsep + this.dM;	
			if(this.dD > 0 && this.dD < 32  ){ 
				output += dsep + this.dD;
				// Time and can only be created with a full date
				if( typeof( this.tH ) != 'undefined' ){
					if( this.tH > -1 && this.tH < 25 ) {
						output += 'T' + this.tH
						if(  this.tM > -1 && this.tM < 61 ) {
							output += tsep + this.tM;
							if(  this.tS > -1 && this.tS < 61 ) {
								output += tsep + this.tS;
								if(  this.tD > -1 )
									output += '.' + this.tD; 
							}
						}
							// Time zone offset can only be created with a hour
							if(this.z) { output += 'Z' };
							if( typeof( this.tzH ) != 'undefined' ){
								if( this.tzH > -1 && this.tzH < 25 ) {
									output += this.tzPN + this.tzH
									if( this.tzM > -1 && this.tzM < 61 ) 
										output += tsep + this.tzM;
								}
							}
					}	
				}	
			}
		}	
	}
	return output;
}




function CompareISODates( date1, date2 ) {
	var iso1 = new ISODate( date1 ).toString().replace(/:00/g,"");
	var iso2 = new ISODate( date2 ).toString().replace(/:00/g,"");
	if( ( iso1 == '') && (iso2 == '') ){
		return false;
	}else{
		if( iso1 == iso2 )
			return true;
		else
			return false;
     }
}







// Tests
 //alert( new ISODate('2008-01-21').toString() + ' - 2008-01-21' ) ;

//alert(ISODateNormalisation( '2008-01-21' ) + ' - 2008-01-21' ) ;
//alert(ISODateNormalisation( '20080121' ) + ' - 20080121' ) ;
//alert(ISODateNormalisation( '2007-05-01T11:30') + ' - 2007-05-01T11:30' );
//alert(ISODateNormalisation( '2007-05-01 11:30' ) + ' - 2007-05-01 11:30');
//alert(ISODateNormalisation( '20070501 11:30' ) + ' - 20070501 11:30');
//alert(ISODateNormalisation( '20070501T1130' ) + ' - 20070501T1130') ;
//alert(ISODateNormalisation( '2007-05-01T11:30:15' ) + ' - 2007-05-01T11:30:15') ;
//alert(ISODateNormalisation( '20070501T113015' ) + ' - 20070501T113015') ;
//alert(ISODateNormalisation( '2007-05-01T11:30Z-08:00' ) + ' - 2007-05-01T11:30Z-08:00') ;
//alert(ISODateNormalisation( '2007-05-01T11:30-08:00' ) + ' - 2007-05-01T11:30-08:00') ;
//alert(ISODateNormalisation( '2007-05-01T11:30+08:00' ) + ' - 2007-05-01T11:30+08:00') ;
//alert(ISODateNormalisation( '2007-05-01T11:30Z08:00' ) + ' - 2007-05-01T11:30Z08:00') ;
//alert(ISODateNormalisation( '20070501T1130Z-0800' ) + ' - 20070501T1130Z-0800') ;
//alert(ISODateNormalisation( '2007-05-01T11:30Z' ) + ' - 2007-05-01T11:30Z') ;
//alert(ISODateNormalisation( '2007-05' ) + ' - 2007-05') ;
//alert(ISODateNormalisation( '07-05-01' ) + ' - 07-05-01') ;
//alert(ISODateNormalisation( '070501' ) + ' - 070501') ;