/*
================================================================================
dateformat.js : funcoes para validacao e formatacao de estilo de datas em js
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Autor: ?
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Ultima Alteracao: 20/07/05             |  Autor: Rafael <rafaelc@vegait.com.br>
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================================================================================
*/


/* Controle de Datas: mascara, formato, validacao

<input name="qualquernome" size="12" maxlength="10"
       onFocus="javascript:vDateType='3'"
       onKeyUp="DateFormat(this,this.value,event,false,'3')"
       onBlur="DateFormat(this,this.value,event,true,'3')">
*/

var isNav4 = false, isNav5 = false, isIE4 = false
var strSeperator = "/";
var vDateType = 3; // Global value for type of date format
//                1 = mm/dd/yyyy
//                2 = yyyy/dd/mm  (Unable to do date check at this time)
//                3 = dd/mm/yyyy

var vYearType = 4; //Set to 2 or 4 for number of digits in the year for Netscape
var vYearLength = 2; // Set to 4 if you want to force the user to enter 4 digits for the year before validating.
var err = 0; // Set the error code to a default of zero
if(navigator.appName == "Netscape") {
    if (navigator.appVersion < "5") {
        isNav4 = true;
        isNav5 = false;
    }else
        if (navigator.appVersion > "4") {
            isNav4 = false;
            isNav5 = true;
        }
}else{
    isIE4 = true;
}

function DateFormat(vDateName, vDateValue, e, dateCheck, dateType) {
    vDateType = dateType;
    // vDateName = object name
    // vDateValue = value in the field being checked
    // e = event
    // dateCheck
    // True  = Verify that the vDateValue is a valid date
    // False = Format values being entered into vDateValue only vDateType
    //Enter a tilde sign for the first number and you can check the variable information.
    if (vDateValue == "~") {
        alert("AppVersion = "+navigator.appVersion+" Nav. 4 Version = "+isNav4+" Nav. 5 Version = "+isNav5+" IE Version = "+isIE4+" Year Type = "+vYearType+" Date Type = "+vDateType+" Separator = "+strSeperator);
        vDateName.value = "";
        vDateName.focus();
        return true;
    }

    var whichCode = (window.Event) ? e.which : e.keyCode;
    // Check to see if a seperator is already present.
    // bypass the date if a seperator is present and the length greater than 8
    if (vDateValue.length > 8 && isNav4) {
        if ((vDateValue.indexOf("-") >= 1) || (vDateValue.indexOf("/") >= 1))
            return true;
    }
    //Eliminate all the ASCII codes that are not valid
    var alphaCheck = " abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ/-";
    if (alphaCheck.indexOf(vDateValue) >= 1) {
        if (isNav4) {
            vDateName.value = "";
            vDateName.focus();
            vDateName.select();
            return false;
        } else {
            vDateName.value = vDateName.value.substr(0, (vDateValue.length-1));
            return false;
       }
    }

    if (whichCode == 8) //Ignore the Netscape value for backspace. IE has no value
        return false;
    else {
        //Create numeric string values for 0123456789/
        //The codes provided include both keyboard and keypad values
        var strCheck = '47,48,49,50,51,52,53,54,55,56,57,58,59,95,96,97,98,99,100,101,102,103,104,105';
        if (strCheck.indexOf(whichCode) != -1 || whichCode == undefined) {
            if (isNav4) {
                if (((vDateValue.length < 6 && dateCheck) || (vDateValue.length == 7 && dateCheck)) && (vDateValue.length >=1)) {
                    alert("Data informada incorreta. O formato padrão é dd/mm/aaaa");
                    vDateName.value = "";
                    vDateName.focus();
                    vDateName.select();
                    return false;
                }
            if (vDateValue.length == 6 && dateCheck) {
                var mDay = vDateName.value.substr(2,2);
                var mMonth = vDateName.value.substr(0,2);
                var mYear = vDateName.value.substr(4,4)
                //Turn a two digit year into a 4 digit year
                if (mYear.length == 2 && vYearType == 4) {
                    var mToday = new Date();
                    //If the year is greater than 30 years from now use 19, otherwise use 20
                    var checkYear = mToday.getFullYear() + 30;
                    var mCheckYear = '20' + mYear;
                    if (mCheckYear >= checkYear)
                        mYear = '19' + mYear;
                    else
                        mYear = '20' + mYear;
                }
                var vDateValueCheck = mMonth+strSeperator+mDay+strSeperator+mYear;
                if (!dateValid(vDateValueCheck)) {
                    alert("Data informada incorreta. O formato padrão é dd/mm/aaaa");
                    vDateName.value = "";
                    vDateName.focus();
                    vDateName.select();
                    return false;
                }
                return true;
            } else {
                // Reformat the date for validation and set date type to a 1
                if (vDateValue.length >= 8  && dateCheck) {
                    if (vDateType == 1) // mmddyyyy
                    {
                        var mDay = vDateName.value.substr(2,2);
                        var mMonth = vDateName.value.substr(0,2);
                        var mYear = vDateName.value.substr(4,4)
                        vDateName.value = mMonth+strSeperator+mDay+strSeperator+mYear;
                    }
if (vDateType == 2) // yyyymmdd
{
var mYear = vDateName.value.substr(0,4)
var mMonth = vDateName.value.substr(4,2);
var mDay = vDateName.value.substr(6,2);
vDateName.value = mYear+strSeperator+mMonth+strSeperator+mDay;
}
if (vDateType == 3) // ddmmyyyy
{
var mMonth = vDateName.value.substr(2,2);
var mDay = vDateName.value.substr(0,2);
var mYear = vDateName.value.substr(4,4)
vDateName.value = mDay+strSeperator+mMonth+strSeperator+mYear;
}
//Create a temporary variable for storing the DateType and change
//the DateType to a 1 for validation.
var vDateTypeTemp = vDateType;
vDateType = 1;
var vDateValueCheck = mMonth+strSeperator+mDay+strSeperator+mYear;
if (!dateValid(vDateValueCheck)) {
alert("Data informada incorreta. O formato padrão é dd/mm/aaaa");
vDateType = vDateTypeTemp;
vDateName.value = "";
vDateName.focus();
vDateName.select();
return false;
}
vDateType = vDateTypeTemp;
return true;
}
else {
if (((vDateValue.length < 8 && dateCheck) || (vDateValue.length == 9 && dateCheck)) && (vDateValue.length >=1)) {
alert("Data informada incorreta. O formato padrão é dd/mm/aaaa");
vDateName.value = "";
vDateName.focus();
vDateName.select();
return false;
         }
      }
   }
}
else {

// Non isNav Check
if (((vDateValue.length < 8 && dateCheck) || (vDateValue.length == 9 && dateCheck)) && (vDateValue.length >=1)) {
alert("Data informada incorreta. O formato padrão é dd/mm/aaaa");
vDateName.value = "";
vDateName.focus();
return true;
}
// Reformat date to format that can be validated. mm/dd/yyyy
if (vDateValue.length >= 8 && dateCheck) {
// Additional date formats can be entered here and parsed out to
// a valid date format that the validation routine will recognize.
if (vDateType == 1) // mm/dd/yyyy
{
var mMonth = vDateName.value.substr(0,2);
var mDay = vDateName.value.substr(3,2);
var mYear = vDateName.value.substr(6,4)
}
if (vDateType == 2) // yyyy/mm/dd
{
var mYear = vDateName.value.substr(0,4)
var mMonth = vDateName.value.substr(5,2);
var mDay = vDateName.value.substr(8,2);
}
if (vDateType == 3) // dd/mm/yyyy
{
    var mDay = vDateName.value.substr(0,2);
    var mMonth = vDateName.value.substr(3,2);
    var mYear = vDateName.value.substr(6,4)
}
if (vYearLength == 4) {
    if (mYear.length < 4) {
        alert("Data informada incorreta. O formato padrão é dd/mm/aaaa");
        vDateName.value = "";
        vDateName.focus();
        return true;
   }
}
// Create temp. variable for storing the current vDateType
var vDateTypeTemp = vDateType;
// Change vDateType to a 1 for standard date format for validation
// Type will be changed back when validation is completed.
vDateType = 1;
// Store reformatted date to new variable for validation.
var vDateValueCheck = mMonth+strSeperator+mDay+strSeperator+mYear;
if (mYear.length == 2 && vYearType == 4 && dateCheck) {
//Turn a two digit year into a 4 digit year
var mToday = new Date();
//If the year is greater than 30 years from now use 19, otherwise use 20
var checkYear = mToday.getFullYear() + 30;
var mCheckYear = '20' + mYear;
if (mCheckYear >= checkYear)
mYear = '19' + mYear;
else
mYear = '20' + mYear;
vDateValueCheck = mMonth+strSeperator+mDay+strSeperator+mYear;
// Store the new value back to the field.  This function will
// not work with date type of 2 since the year is entered first.
if (vDateTypeTemp == 1) // mm/dd/yyyy
vDateName.value = mMonth+strSeperator+mDay+strSeperator+mYear;
if (vDateTypeTemp == 3) // dd/mm/yyyy
vDateName.value = mDay+strSeperator+mMonth+strSeperator+mYear;
}
if (!dateValid(vDateValueCheck)) {
alert("Data informada incorreta. O formato padrão é dd/mm/aaaa");
vDateType = vDateTypeTemp;
vDateName.value = "";
vDateName.focus();
return true;
}
vDateType = vDateTypeTemp;
return true;
}
else {
if (vDateType == 1) {
if (vDateValue.length == 2) {
vDateName.value = vDateValue+strSeperator;
}
if (vDateValue.length == 5) {
vDateName.value = vDateValue+strSeperator;
   }
}
if (vDateType == 2) {
if (vDateValue.length == 4) {
vDateName.value = vDateValue+strSeperator;
}
if (vDateValue.length == 7) {
vDateName.value = vDateValue+strSeperator;
   }
}
if (vDateType == 3) {
if (vDateValue.length == 2) {
vDateName.value = vDateValue+strSeperator;
}
if (vDateValue.length == 5) {
vDateName.value = vDateValue+strSeperator;
   }
}
return true;
   }
}
if (vDateValue.length == 10&& dateCheck) {
if (!dateValid(vDateName)) {
// Un-comment the next line of code for debugging the dateValid() function error messages
//alert(err);
alert("Data informada incorreta. O formato padrão é dd/mm/aaaa");
vDateName.focus();
vDateName.select();
   }
}
return false;
    } else {
        // If the value is not in the string return the string minus the last
        // key entered.
        if (isNav4) {
            vDateName.value = "";
            vDateName.focus();
            vDateName.select();
            return false;
        } else {
            //vDateName.value = vDateName.value.substr(0, (vDateValue.length-1));
            return false;
        }
    }
}
}

function dateValid(objName) {
    var strDate;
    var strDateArray;
    var strDay;
    var strMonth;
    var strYear;
    var intday;
    var intMonth;
    var intYear;
    var booFound = false;
    var datefield = objName;
    var strSeparatorArray = new Array("-"," ","/",".");
    var intElementNr;
    // var err = 0;
    var strMonthArray = new Array(12);
    strMonthArray[0] = "Jan";
    strMonthArray[1] = "Fev";
    strMonthArray[2] = "Mar";
    strMonthArray[3] = "Abr";
    strMonthArray[4] = "Mai";
    strMonthArray[5] = "Jun";
    strMonthArray[6] = "Jul";
    strMonthArray[7] = "Ago";
    strMonthArray[8] = "Set";
    strMonthArray[9] = "Out";
    strMonthArray[10] = "Nov";
    strMonthArray[11] = "Dez";
    //strDate = datefield.value;
    strDate = objName;
    if (strDate.length < 1) {
        return true;
    }
    for (intElementNr = 0; intElementNr < strSeparatorArray.length; intElementNr++) {
        if (strDate.indexOf(strSeparatorArray[intElementNr]) != -1) {
            strDateArray = strDate.split(strSeparatorArray[intElementNr]);
            if (strDateArray.length != 3) {
                err = 1;
                return false;
            } else {
                strDay = strDateArray[0];
                strMonth = strDateArray[1];
                strYear = strDateArray[2];
            }
            booFound = true;
        }
    }
    if (booFound == false) {
        if (strDate.length>5) {
            strDay = strDate.substr(0, 2);
            strMonth = strDate.substr(2, 2);
            strYear = strDate.substr(4);
        }
    }
    //Adjustment for short years entered
if (strYear.length == 2) {
strYear = '20' + strYear;
}
strTemp = strDay;
strDay = strMonth;
strMonth = strTemp;
intday = parseInt(strDay, 10);
if (isNaN(intday)) {
err = 2;
return false;
}
intMonth = parseInt(strMonth, 10);
if (isNaN(intMonth)) {
for (i = 0;i<12;i++) {
if (strMonth.toUpperCase() == strMonthArray[i].toUpperCase()) {
intMonth = i+1;
strMonth = strMonthArray[i];
i = 12;
   }
}
if (isNaN(intMonth)) {
err = 3;
return false;
   }
}
intYear = parseInt(strYear, 10);
if (isNaN(intYear)) {
err = 4;
return false;
}
if (intMonth>12 || intMonth<1) {
err = 5;
return false;
}
if ((intMonth == 1 || intMonth == 3 || intMonth == 5 || intMonth == 7 || intMonth == 8 || intMonth == 10 || intMonth == 12) && (intday > 31 || intday < 1)) {
err = 6;
return false;
}
if ((intMonth == 4 || intMonth == 6 || intMonth == 9 || intMonth == 11) && (intday > 30 || intday < 1)) {
err = 7;
return false;
}
if (intMonth == 2) {
if (intday < 1) {
err = 8;
return false;
}
if (LeapYear(intYear) == true) {
if (intday > 29) {
err = 9;
return false;
   }
}
else {
if (intday > 28) {
err = 10;
return false;
      }
   }
}
return true;
}

function LeapYear(intYear) {
    if (intYear % 100 == 0) {
        if (intYear % 400 == 0) { return true; }
    }
    else {
        if ((intYear % 4) == 0) { return true; }
    }
    return false;
}