// define duas datas com intervalo de um ano entre elas para o formulário
function setDatasInicial()
{
	var idioma = document.formHistorico.idioma.value;

	var data = new Date();
	var dia = data.getDate();
	var mes = data.getMonth() + 1;
	
	if(dia < 10)
	{
		dia = "0" + dia;        
	}
	
	if(mes < 10)
	{
		mes = "0" + mes;
	}
	
	if(idioma == "en")
	{
		var ano = data.getFullYear();
		var strData = mes + "/" + dia + "/" + ano;
		document.formHistorico.dataFinal.value = strData;         
		ano--;
		strData = mes + "/" + dia + "/" + ano;
		document.formHistorico.dataInicial.value = strData;		
	}
	else
	{
		var ano = data.getFullYear();
		var strData = dia + "/" + mes + "/" + ano;
		document.formHistorico.dataFinal.value = strData;         
		ano--;
		strData = dia + "/" + mes + "/" + ano;
		document.formHistorico.dataInicial.value = strData;         
	}
}

/**
 * DHTML date validation script. Courtesy of SmartWebby.com (http://www.smartwebby.com/dhtml/)
 */
// Declaring valid date character, minimum year and maximum year
var dtCh= "/";
var minYear=1960;
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 isBRDate(dtStr, strData)
{
	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){
		alert("O formato da " + strData + " deve ser: dd/mm/yyyy");
		return false
	}
	if (strMonth.length<1 || month<1 || month>12){
		alert("Por favor, digite um mês válido no campo "+ strData);
		return false
	}
	if (strDay.length<1 || day<1 || day>31 || (month==2 && day>daysInFebruary(year)) || day > daysInMonth[month]){
		alert("Por favor, digite um dia válido no campo "+ strData)
		return false
	}
	if (strYear.length != 4 || year==0 || year<minYear || year>maxYear){
		alert("Por favor, digite um ano válido, com 4 dígitos, entre "+minYear+" e "+maxYear + " no campo " + strData);
		return false
	}
	if (dtStr.indexOf(dtCh,pos2+1)!=-1 || isInteger(stripCharsInBag(dtStr, dtCh))==false){
		alert("Por favor, entre uma data válida no campo "+ strData);
		return false
	}
return true
}

function isUSDate(dtStr, strDate){
	var daysInMonth = DaysArray(12)
	var pos1=dtStr.indexOf(dtCh)
	var pos2=dtStr.indexOf(dtCh,pos1+1)
	var strMonth=dtStr.substring(0,pos1)
	var strDay=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){
		alert("The date format should be : mm/dd/yyyy")
		return false
	}
	if (strMonth.length<1 || month<1 || month>12){
		alert("Please enter a valid month")
		return false
	}
	if (strDay.length<1 || day<1 || day>31 || (month==2 && day>daysInFebruary(year)) || day > daysInMonth[month]){
		alert("Please enter a valid day")
		return false
	}
	if (strYear.length != 4 || year==0 || year<minYear || year>maxYear){
		alert("Please enter a valid 4 digit year between "+minYear+" and "+maxYear)
		return false
	}
	if (dtStr.indexOf(dtCh,pos2+1)!=-1 || isInteger(stripCharsInBag(dtStr, dtCh))==false){
		alert("Please enter a valid date")
		return false
	}
return true
}

function isESDate(dtStr, strData){
	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){
		alert("El formato de "+ strData +" debe ser: dd/mm/yyyy")
		return false
	}
	if (strMonth.length<1 || month<1 || month>12){
		alert( "Por favor, teclee un mes válido en el campo "+ strData)
		return false
	}
	if (strDay.length<1 || day<1 || day>31 || (month==2 && day>daysInFebruary(year)) || day > daysInMonth[month]){
		alert("Por favor, teclee un día válido en el campo "+ strData)
		return false
	}
	if (strYear.length != 4 || year==0 || year<minYear || year>maxYear){
		alert("Por favor, teclee un año válido, con 4 dígitos, entre "+minYear+" y "+maxYear)
		return false
	}
	if (dtStr.indexOf(dtCh,pos2+1)!=-1 || isInteger(stripCharsInBag(dtStr, dtCh))==false){
		alert("Por favor, inserte una fecha válida en el campo "+ strData)
		return false
	}
return true
}

function ValidateForm()
{
	var idioma = document.formHistorico.idioma.value;
	
	var dt=document.formHistorico.dataInicial;
	var agora = new Date();
	maxYear = agora.getFullYear();
	if(idioma == "en")
	{
		if (isUSDate(dt.value, "initial date")==false)
		{
			dt.focus()
			return false
		}
	}
	else if(idioma == "es")
	{
		if (isESDate(dt.value, "data inicial")==false)
		{
			dt.focus()
			return false
		}
	}
	else
	{
		if (isBRDate(dt.value, "data inicial")==false)
		{
			dt.focus()
			return false
		}
	}

	
	dt=document.formHistorico.dataFinal;
	
	if(idioma == "en")
	{	
		if (isUSDate(dt.value, "final date")==false)
		{
			dt.focus()
			return false
		}
	}
	else if(idioma == "es")
	{
		if (isESDate(dt.value, "data final")==false)
		{
			dt.focus()
			return false
		}
	}
	else
	{
		if (isBRDate(dt.value, "data final")==false)
		{
			dt.focus()
			return false
		}
	}
   return true
 }