// Array de Separadores para a data
var lA_ArrayOfSeparators = new Array("/", "-");

// Constantes de validacao de datas
var DAY 	= 1;
var MONTH 	= 2;
var YEAR	= 3;
var YEAR_RANGE_SUP	= 2100;
var YEAR_RANGE_INF	= 1900;


// Retorna o dia, mes ou ano do pValue comforme o pWhat
function GiveMe(pValue, pWhat)
{
	var lValue = new String(""), lnIndex = 0;

	lnIndex = 0;
	while(lnIndex < lA_ArrayOfSeparators.length && lValue.length==0)
	{
		switch(pWhat)
		{
			case 1 : //Day
				lValue = new String(pValue.substring(0, pValue.indexOf(lA_ArrayOfSeparators[lnIndex])));
				break;
			case 2 : //MONTH
			 	lValue = new String(pValue.substring(pValue.indexOf(lA_ArrayOfSeparators[lnIndex]) + 1, pValue.lastIndexOf(lA_ArrayOfSeparators[lnIndex])));
			 	break;
			case 3 : //YEAR
			 	lValue = new String(pValue.substring(pValue.lastIndexOf(lA_ArrayOfSeparators[lnIndex]) + 1, pValue.length));
			 	if (lValue == pValue) lValue= new String("");
			 	break;
		}
		lnIndex++;
	}
	return lValue.length == 0 ? null : lValue;
}


// Verifica se a string só tem números
function VerifyNumbers(pValue)
{
	var Index;
	
	if (isNaN(parseInt(pValue))) return false;
	for (Index = 0; Index < pValue.length; Index ++ ) if (pValue.charAt(Index)<'0' ||  pValue.charAt(Index)>'9') return false;
	return true;
}

// Verifica se a string só tem número e ponto
function VerifyNumbersAndPoint(pValue)
{
	var Index, Already;
	
	Already = false;
	
	if (isNaN(parseFloat(pValue))) return false;

	for (Index = 0; Index < pValue.length; Index ++ ) 
	{
		if (pValue.charAt(Index)=='.' && Already == false) 
		{
			if (Already==false) Index ++
			else return false;
			Already = true;
		}
			
		if (pValue.charAt(Index)<'0' ||  pValue.charAt(Index)>'9') return false;
	}		
	return true;
}


function ValidateIntegerValue(pValue)
{
	if(pValue==null) return null;
	if( pValue.lenght == 0) return null;	
	return VerifyNumbers(pValue)==true ? parseInt(pValue) : null;
}


function ValidateRealValue(pValue)
{
	if(pValue==null) return null;
	if( pValue.lenght==0) return null;
	return VerifyNumbersAndPoint(pValue.replace(",", "."))==true ? parseFloat(pValue.replace(",", ".")) : null;
}

function ValidateHourValue(pValue)
{
	var Hora, Minuto;
	
	Hora = pValue.substring(0, pValue.indexOf(':'));
	Minuto = pValue.substring(pValue.indexOf(':') + 1, pValue.length);
	
	if(Hora==null || Minuto == null) return null;
		
	if(Hora > 23 || Hora < 0) return null;
	if(Minuto > 59 || Minuto < 0) return null;
	
	return pValue;
}

function ValidateDateHourValue(pValue)
{
	var Hora, Minuto;
	
	
	if(pValue.indexOf(' ') != -1)
	{
		if(ValidateDateValue(pValue.substring(0,pValue.indexOf(' '))) == null)
			return null;
			
		//Verificar Hora
		Hora = pValue.substring(pValue.indexOf(' ') + 1, pValue.indexOf(':'));
		Minuto = pValue.substring(pValue.indexOf(':') + 1, pValue.length);
		
		if(Hora == 'undefined' || Minuto == 'undefined') return ValidateDateValue(pValue.substring(0,pValue.indexOf(' ')))
			
		if(Hora==null || Minuto == null) return ValidateDateValue(pValue);
			
		if(Hora > 23 || Hora < 0) return ValidateDateValue(pValue);
		if(Minuto > 59 || Minuto < 0) return ValidateDateValue(pValue);
		
	}
	else 
		return ValidateDateValue(pValue.substring(0,pValue.length));

	return ValidateDateValue(pValue.substring(0,pValue.indexOf(' '))) + ' ' + Hora + ':' + Minuto;
}


// Valida a data. Se Correcto -> Data, se errado -> null

function ValidateDateValueSpecial(pValue)
{
	var lDate = null;
	var lDay, lMonth, lYear;
	
	
	if(pValue==null) return null;
	if( pValue.lenght==0) return null;
	
	lDay = GiveMe(pValue,DAY)
	lMonth = GiveMe(pValue, MONTH);
	lYear = GiveMe(pValue, YEAR)
		
	if ( lDay != null && lMonth != null && lYear != null)
	{
		lDate = new Date ();
		lDate.setMonth(lMonth - 1);
		lDate.setDate(lDay);

		if ( lYear.length > 2 )
		{
			lDate.setFullYear(lYear);
			
			if ((lDay == lDate.getDate()) && (lMonth == (lDate.getMonth() + 1)) && (lYear == lDate.getFullYear()))
			{
				if (lDate.getFullYear() >= YEAR_RANGE_INF && lDate.getFullYear() <= YEAR_RANGE_SUP)
					return new String(lDate.getFullYear() + "-" + (lDate.getMonth() + 1) + "-" + lDate.getDate())
			}
		}
		else
		{
			lDate.setYear(lYear);
			if ((lDay == lDate.getDate()) && (lMonth == lDate.getMonth() + 1) && (lYear == lDate.getYear()))
			{
				if (lDate.getFullYear() >= YEAR_RANGE_INF && lDate.getFullYear() <= YEAR_RANGE_SUP)
					return new String(lDate.getFullYear() + "-" + (lDate.getMonth() + 1) + "-" + lDate.getDate())
			}
		}
	}
	return null;
}



// Declaring valid date character, minimum year and maximum year
var dtCh= "-";
var minYear=1900;
var maxYear=2100;

function isInteger(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;
}

function stripCharsInBag(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;
}

function daysInFebruary (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 );
}
function DaysArray(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
}

function ValidateDateValue(dtStr){
	var daysInMonth = DaysArray(12)
	var pos1=dtStr.indexOf(dtCh)
	var pos2=dtStr.indexOf(dtCh,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)
	if (pos1==-1 || pos2==-1){
		return null;
	}
	if (strMonth.length<1 || month<1 || month>12){
		return null;
	}
	if (strDay.length<1 || day<1 || day>31 || (month==2 && day>daysInFebruary(year)) || day > daysInMonth[month]){
		return null;
	}
	if (strYear.length != 4 || year==0 || year<minYear || year>maxYear){
		return null;
	}
	if (dtStr.indexOf(dtCh,pos2+1)!=-1 || isInteger(stripCharsInBag(dtStr, dtCh))==false){
		return null;
	}
	return year + '-' + month + '-' + day
}