/**
 * DHTML date validation script. Courtesy of SmartWebby.com (http://www.smartwebby.com/dhtml/)
 */

var DateValidator = {

// Declaring valid date character, minimum year and maximum year
	delimiter : "/", 
	VALID_CALENDAR_YEARS : [ DEALCHECKER_CURRENT_YEAR, DEALCHECKER_CURRENT_YEAR + 2 ],

	isInteger : function(s) {
		var i;
	    for (i = 0; i < s.length; i++){   
	        // Check that current character is number.
	        var c = s.charAt(i);
	        if (((c < "0") || (c > "9"))) return false;
	    }
	    // All characters are numbers.
	    return true;
	},

	stripCharsInBag : function(s, bag) {
		var i;
	    var returnString = "";
	    // Search through string's characters one by one.
	    // If character is not in bag, append to returnString.
	    for (i = 0; i < s.length; i++){   
	        var c = s.charAt(i);
	        if (bag.indexOf(c) == -1) returnString += c;
	    }
	    return returnString;
	},

	daysInFebruary : function(year) {
		// February has 29 days in any year evenly divisible by four,
	    // EXCEPT for centurial years which are not also divisible by 400.
	    return (((year % 4 == 0) && ( (!(year % 100 == 0)) || (year % 400 == 0))) ? 29 : 28 );
	},
	
	DaysArray : function(n) {
		for (var i = 1; i <= n; i++) {
			this[i] = 31;
			if (i==4 || i==6 || i==9 || i==11) {
				this[i] = 30;
			}
			if (i==2) {
				this[i] = 29;
			}
	   } 
	   return this;
	},

	//
	// checks the date and returns and object indicating whether or not the date is valid,
	// and an associated array of errors.
	//
	// so to find out if a date is valid, you would go
	//	DateValidator.checkDate("datestring").valid
	//
	checkDate : function(dtStr) {
		var errors = [];
		var errorIdx = 0;
		var daysInMonth = DateValidator.DaysArray(12);
		var pos1=dtStr.indexOf(DateValidator.delimiter);
		var pos2=dtStr.indexOf(DateValidator.delimiter,pos1+1);
		var strDay=dtStr.substring(0,pos1);
		var strMonth=dtStr.substring(pos1+1,pos2);
		var strYear=dtStr.substring(pos2+1);
		strYr=strYear;
		if (strDay.charAt(0)=="0" && strDay.length>1) strDay=strDay.substring(1);
		if (strMonth.charAt(0)=="0" && strMonth.length>1) strMonth=strMonth.substring(1);
		for (var i = 1; i <= 3; i++) {
			if (strYr.charAt(0)=="0" && strYr.length>1) strYr=strYr.substring(1);
		}
		month=parseInt(strMonth);
		day=parseInt(strDay);
		year=parseInt(strYr);
		var enoughErrors = false;
		if (pos1==-1 || pos2==-1){
			errors[errorIdx] = "The date format should be : dd/mm/yyyy";
			enoughErrors = true;
		}
		if (!enoughErrors && (strMonth.length<1 || month<1 || month>12)){
			errors[errorIdx] = "Please enter a valid month";
			errorIdx++;
		}
		if (!enoughErrors && (strDay.length<1 || day<1 || day>31 || (month==2 && day > DateValidator.daysInFebruary(year)) || day > daysInMonth[month])){
			errors[errorIdx] = "Please enter a valid day";
			errorIdx++;
		}
		if (!enoughErrors && (strYear.length != 4 || year==0 || year < DateValidator.VALID_CALENDAR_YEARS[0] || year > DateValidator.VALID_CALENDAR_YEARS[1])){
			errors[errorIdx] = "Please enter a valid 4-digit year between " + DateValidator.VALID_CALENDAR_YEARS[0] + " and " + DateValidator.VALID_CALENDAR_YEARS[1];
			errorIdx++;
		}
		if (!enoughErrors && (dtStr.indexOf(DateValidator.delimiter,pos2+1)!=-1 || DateValidator.isInteger(DateValidator.stripCharsInBag(dtStr, DateValidator.delimiter))==false)){
			errors[errorIdx] = "Please enter a valid date";
			errorIdx++;
		}
		var retVal = { };
		retVal.valid = (errors.length == 0);
		retVal.errors = errors;
		return retVal;
	}
};