// Declaring valid date character, minimum year and maximum year
var dtCh= "/";
var timeCh= ":";
var minCh= ".";
var minYear=1900;
var maxYear=2100;

function trimString(sValue) {
    sValue = sValue.replace( /^\s+/g, "" ); // strip leading
    return sValue.replace( /\s+$/g, "" ); // strip trailing
} //fn

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;
} // fn

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;
} // fn

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 );
} // fn

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
} // fn

function getDate() {
var dNow = new Date()
var iMonth = dNow.getMonth()+1;
var iDay = dNow.getDate();
var iYear = dNow.getFullYear();
return (iMonth + "/" + iDay + "/" + iYear);
}
function getTime(bMilitaryFormat) {
var dNow = new Date()
var iHour = dNow.getHours();
var iMins = dNow.getMinutes();
var iSecs = dNow.getSeconds();
if (bMilitaryFormat != "undefined" && bMilitaryFormat) {
return (iHour + ":" + iMins + ":" + iSecs) 
} else {
var sAMPM="";
if (iHour < 12) {sAMPM = " AM";} else { sAMPM = " PM"; }
if (iHour == 0) {iHour = 12;}
if (iHour > 12) {iHour = iHour - 12;}
return (iHour + ":" + iMins + ":" + iSecs + sAMPM) 
}
}

function normalizeDateTime(oTXT) {

    // Convert to format mm/dd/yyyy hh:mm (military)
    var sValue=trimString(oTXT.value);
    
    if (sValue.length==0) {
        oTXT.value="";
        return true;
    }
    
    var aPieces=sValue.split(" ");
    if (aPieces.length!=2) {
        oTXT.value="";
        return false;
    }
    
    var sDatePiece=trimString(aPieces[0]);
    var sTimePiece=trimString(aPieces[1]);
    
    var sReturn=isDate(sDatePiece,false);
    if (sReturn=="-1") {
        oTXT.value="";
        return false;
    }
    sDatePiece=sReturn;
        
    var sReturn=isTime(sTimePiece,false);
    if (sReturn=="-1") {
        oTXT.value="";
        return false;
    }
    sTimePiece=sReturn;

    if (sDatePiece.length>0 && sTimePiece.length>0)
        oTXT.value=(sDatePiece + " " + sTimePiece);
    else    
        oTXT.value="";
    
    return true;
    
} // fn

function normalizeItem(oTXT,sType) {

    // Convert to format hh:mm (miltary)
    var sValue=trimString(oTXT.value);
    
    if (sValue.length==0) {
        oTXT.value="";
        return true;
    }
    
    var sReturn="-1";

    if (sType=="date") {
        sReturn=isDate(sValue,false);
        
    } else if (sType=="time") {
        sReturn=isTime(sValue,false);
        
    } else if (sType=="degree") {
        sReturn=isDegree(sValue,false,oTXT.maxLength);

    } else if (sType=="minutes") {
        sReturn=isMinute(sValue,false);
    
    } else {
        oTXT.value="";
        return false;
    }

    if (sReturn=="-1") {
        oTXT.value="";
        return false;
    } else {
        oTXT.value=sReturn;
        return true;
    }
    
} // fn

function isDateFromField(oDtField, bShowMessage, bClearOnError){

    var dtStr=trimString(oDtField.value);
    
    var sResult=isDate(dtStr,bShowMessage);
    if (sResult=="-1") {
        oDtField.value="";
        return false;
    } else {
        oDtField.value=sResult;
        return true;
    }
} // fn

function isDate(sDateValue, bShowMessage){

    var sResult="-1";
    
    var dtStr=sDateValue;

    if (dtStr.length==0) return "";
    
	var pos1=dtStr.indexOf(dtCh);
	var pos2=dtStr.indexOf(dtCh,pos1+1);

	var strMonth;
	var strDay;
	var strYear;
	var strYr;
	var year;

	if (pos1==-1 || pos2==-1){
		//alert("The date format should be : mm/dd/yyyy")
		//return false
		
		// Set up for a mmddyyyy or mmddyy format
        if (dtStr.length==6) {
	        strYear=dtStr.substr(4,2);
	        strMonth=dtStr.substr(2,2);
	        strDay=dtStr.substr(0,2);
	        dtStr=strDay+dtCh+strMonth+dtCh+strYear;    // Rebuild the string with slashes
	        pos1=dtStr.indexOf(dtCh);                   // Reset the position vars
	        pos2=dtStr.indexOf(dtCh,pos1+1);
	        
        } else if (dtStr.length==8) {
	        strMonth=dtStr.substr(2,2);
	        strDay=dtStr.substr(0,2);
	        strYear=dtStr.substr(4,4);
	        dtStr=strDay+dtCh+strMonth+dtCh+strYear;
	        pos1=dtStr.indexOf(dtCh);
	        pos2=dtStr.indexOf(dtCh,pos1+1);
	        
        } else {
            // Definitely an invalid date
		    if (bShowMessage) alert("Please enter a valid date.\n\nThe date format should be: 'mm/dd/yyyy', 'mm/dd/yy', 'mmddyy', or 'mmddyyyy'.");
		    return sResult;
        }
	}

    strMonth=dtStr.substring(0,pos1);
    strDay=dtStr.substring(pos1+1,pos2);
    strYear=dtStr.substring(pos2+1);
    strYr=strYear;

	var daysInMonth = DaysArray(12);
	
	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);
	}
	var month=parseInt(strMonth);
	var day=parseInt(strDay);
	year=parseInt(strYr);
	if (strMonth.length<1 || month<1 || month>12){
		if (bShowMessage) alert("Please enter a valid month");
		return sResult;
	}
	if (strDay.length<1 || day<1 || day>31 || (month==2 && day>daysInFebruary(year)) || day > daysInMonth[month]){
		if (bShowMessage) alert("Please enter a valid day");
		return sResult;
	}

	if (strYear.length == 2 ){
        // User entered a 2 digit year; convert to a four digit year	        
        if (!isInteger(strYear)) {
            if (bShowMessage) alert("Please enter a valid date.\n\nThe date format should be: 'mm/dd/yyyy', 'mm/dd/yy', 'mmddyy', or 'mmddyyyy'.");
            return sResult;
        } else {
            year=parseInt(strYear);
            if (year<25) {
                strYear=("20"+strYear); // 00 - 25, assume user means 2000 - 2025
                year=(2000+year)
            } else {
                strYear=("19"+strYear); // > 25, assume user means 1926 - 1999
                year=(1900+year)
            }
        }
	} // if

	if (strYear.length != 4 || year==0 || year<minYear || year>maxYear){
		if (bShowMessage) alert("Please enter a valid 4 digit year between "+minYear+" and "+maxYear);
		return sResult;
	}
	if (dtStr.indexOf(dtCh,pos2+1)!=-1 || isInteger(stripCharsInBag(dtStr, dtCh))==false){
		if (bShowMessage) alert("Please enter a valid date.\n\nThe date format should be: 'mm/dd/yyyy', 'mm/dd/yy', 'mmddyy', or 'mmddyyyy'.");
		return sResult;
	}

	sDateValue=(strMonth+dtCh+strDay+dtCh+strYear); // Reset the value with the new formatting if any

    return sDateValue;
}

function isTime(sTimeValue, bShowMessage){

    var sResult="-1";
    var dtStr=sTimeValue;

    if (dtStr.length==0) return "";
    
	var pos1=dtStr.indexOf(timeCh);

    var sHour;
    var sMin;

	if (pos1==-1) {
		
		// Set up for a hhmm format
        if (dtStr.length==4) {
            sHour=dtStr.substr(0,2);
            sMin=dtStr.substr(2,2);
	        dtStr=sHour+timeCh+sMin;    // Rebuild the string with colon
	        pos1=dtStr.indexOf(timeCh);                   // Reset the position vars
	        
        } else {
            // Definitely an invalid time
		    if (bShowMessage) alert("The time format should be: hh:mm, or hhmm");
		    return sResult;
        }
	}

    sHour=dtStr.substring(0,pos1);
    sMin=dtStr.substring(pos1+1,dtStr.length+1);
    
    if (!isNumeric(sHour)) {
		if (bShowMessage) alert("Please enter a valid hour value (1-24)");
		return sResult;
    }
    if (!isNumeric(sMin)) {
		if (bShowMessage) alert("Please enter a valid minute value (0-59)");
		return sResult;
    }
    
	var iHour=parseInt(sHour);
	var iMin=parseInt(sMin);

	if (sHour.length<1 || iHour<1 || iHour>24){
		if (bShowMessage) alert("Please enter a valid hour value (1-24)");
		return sResult;
	}
	if (sMin.length<1 || iMin<0 || iMin>59){
		if (bShowMessage) alert("Please enter a valid minute value (0-59)");
		return sResult;
	}

    if (sHour.length==1) sHour=("0"+sHour);
    if (sMin.length==1) sMin=("0"+sMin);
    
	sTimeValue=(sHour+timeCh+sMin); // Reset the value with the new formatting if any

    return sTimeValue;
}

function isMinute(sMinValue,bShowMessage){

    var sResult="-1";
    var sMin=sMinValue;

    // Format:  dd.ddd
    if (sMin.length==0) return "";
    
	var pos1=sMin.indexOf(minCh);

	if (pos1==-1) {
        // Definitely an invalid value
        if (bShowMessage) alert("The minute format should be: dd.ddd");
        return sResult;
	}

    var sPart1=sMin.substring(0,pos1);
    var sPart2=sMin.substring(pos1+1,sMin.length+1);
    
    if (!isNumeric(sPart1)) {
		if (bShowMessage) alert("Please enter a valid minute value (dd.ddd)");
		return sResult;
    }
    if (!isNumeric(sPart2)) {
		if (bShowMessage) alert("Please enter a valid minute value (dd.ddd)");
		return sResult;
    }
    
	var iPart1=parseInt(sPart1);
	var iPart2=parseInt(sPart2);

	if (sPart1.length<1 || iPart1<1 || iPart1>99){
		if (bShowMessage) alert("Please enter a valid minute value (dd.ddd)");
		return sResult;
	}
	if (sPart2.length<1 || iPart2<1 || iPart2>999){
		if (bShowMessage) alert("Please enter a valid minute value (dd.ddd)");
		return sResult;
	}

    if (sPart1.length==1) sPart1=("0"+sPart1);
    if (sPart2.length==1) sPart2=(sPart2+"00");
    if (sPart2.length==2) sPart2=(sPart2+"0");
    
	sMinValue=(sPart1+minCh+sPart2); // Reset the value with the new formatting if any

    return sMinValue;
}

function isDegree(sDegValue,bShowMessage,iSize){

    var sResult="-1";
    var sDeg=sDegValue;

    if (sDeg.length==0) return "";
    if (iSize!=2 && iSize!=3) return "";
    
    var sErrMsg="Please enter a valid degree value (1-999)";
    var iMaxVal=999;
    var sPad1="00"; var sPad2="0"
    
    if (iSize==2) {
        sErrMsg="Please enter a valid degree value (1-99)";
        iMaxVal=99;
        sPad1="0";
        sPad2="";
    }
    
    if (!isNumeric(sDeg)) {
		if (bShowMessage) alert(sErrMsg);
		return sResult;
    }

	var iDeg=parseInt(sDeg);

	if (sDeg.length<1 || iDeg<1 || iDeg>iMaxVal){
		if (bShowMessage) alert(sErrMsg);
		return sResult;
	}

    if (sDeg.length==1) sDeg=(sPad1+sDeg);
    if (sDeg.length==2) sDeg=(sPad2+sDeg);
    
    return sDeg;
}