/***************************************************************************************/
// General functions
/***************************************************************************************/

/////////////////////////////////////////////////////////////////////////////////////////
// Checks whether a date entered is a valid date or not.
/////////////////////////////////////////////////////////////////////////////////////////
function checkDate(ddVal, mmVal, yyVal) {
	if(ddVal <= 0 || ddVal > 31 || mmVal <= 0 || mmVal > 12 || yyVal <= 0 || yyVal.length != 4) {
		alert("Please enter a valid date");
		return false;
	}
	monthArray = new Array("January", "Febuary", "March", "April", "May", "June", "July", "August", "September", "October", "November", "December");
	if(mmVal == 2) {
		if(yyVal % 4 == 0) {
			if(ddVal > 29) {
				alert("February " + yyVal + " has only 29 days");
				return false;
			}
		}
		else {
			if(ddVal > 28) {
				alert("February " + yyVal + " has only 28 days");
				return false;
			}
		}
	}
	else {
		if(mmVal == 4 || mmVal == 6 || mmVal == 9 || mmVal == 11) {
			if(ddVal > 30) {
				alert(monthArray[mmVal-1] + " has only 30 days");
				return false;
			}
		}
	}
	return true;
}

/////////////////////////////////////////////////////////////////////////////////////////
// Checks whether a string is a valid email address.
/////////////////////////////////////////////////////////////////////////////////////////
function checkEmail(emailString) {
	splitVal = emailString.split('@');
	if(splitVal.length <= 1) {
		alert("Please enter a valid email address");
		return false;
	}
	if(splitVal[0].length <= 0 || splitVal[1].length <= 0) {
		alert("Please enter a valid email address");
		return false;
	}
	
	splitDomain = splitVal[1].split('.');
	if(splitDomain.length <= 1) {
		alert("Please enter a valid email address");
		return false;
	}
	if(splitDomain[0].length <= 0 || splitDomain[1].length <= 1) {
		alert("Please enter a valid email address");
		return false;
	}
	return true;
}

/////////////////////////////////////////////////////////////////////////////////////////
// Removes the leading and trailing spaces in a strings and returns the trimmed string
/////////////////////////////////////////////////////////////////////////////////////////
function trimSpaces(stringValue) {
	// Checks the first occurance of spaces and removes them
	for(i = 0; i < stringValue.length; i++) {
		if(stringValue.charAt(i) != " ") {
			break;
		}
	}
	if(i > 0) {
		stringValue = stringValue.substring(i);
	}
	
	// Checks the last occurance of spaces and removes them
	strLength = stringValue.length - 1;
	for(i = strLength; i >= 0; i--) {
		if(stringValue.charAt(i) != " ") {
			break;
		}
	}
	if(i < strLength) {
		stringValue = stringValue.substring(0, i + 1);
	}
	
	// Returns the string after removing leading and trailing spaces.
	return stringValue;
}

/////////////////////////////////////////////////////////////////////////////////////////
// Check whether a string contain permitted characters only
/////////////////////////////////////////////////////////////////////////////////////////
function checkAllowedChars(strToCheck, allowedChars)
{
     var acLen     = allowedChars.length;
     var stcLen     = strToCheck.length;
     strToCheck     = strToCheck.toLowerCase();
     var i;
     var j;
     var rightCount = 0;
     for(i = 0; i < acLen; i++)
     {
          switch(allowedChars.charAt(i))
          {
          case 'A':
               for(j = 0; j< stcLen; j++)
               {
                    rightCount += strToCheck.charAt(j) >= 'a' && strToCheck.charAt(j) <= 'z';
               }
               break;
          case 'N':
               for(j = 0; j< stcLen; j++)
               {
                    rightCount += strToCheck.charAt(j) >= '0' && strToCheck.charAt(j) <= '9';
               }
               break;
          default:
               for(j = -1; -1 != (j = strToCheck.indexOf(allowedChars.charAt(i), j + 1)); rightCount++);
               break;
          }
     }
     if(rightCount == stcLen)
     {
          return true;
     }
     return false;
}

/////////////////////////////////////////////////////////////////////////////////////////
// Checks whether the first date argument is less than the second date argument
// Date arguments should be in the format - dd/mm/yyyy
/////////////////////////////////////////////////////////////////////////////////////////
function checkDateDifference(lowDate, highDate, comparison) {
	lowDateSplit = lowDate.split('/');
	highDateSplit = highDate.split('/');

	date1 = new Date();
	date2 = new Date();

	date1.setDate(lowDateSplit[0]);
	date1.setMonth(lowDateSplit[1] - 1);
	date1.setYear(lowDateSplit[2]);

	date2.setDate(highDateSplit[0]);
	date2.setMonth(highDateSplit[1] - 1);
	date2.setYear(highDateSplit[2]);

	if(comparison == "eq") {
		if(date1.getTime() == date2.getTime()) {
			return true;
		}
		else {
			return false;
		}
	}
	else if(comparison == "lt") {
		if(date1.getTime() < date2.getTime()) {
			return true;
		}
		else {
			return false;
		}
	}
	else if(comparison == "gt") {
		if(date1.getTime() > date2.getTime()) {
			return true;
		}
		else {
			return false;
		}
	}
	else if(comparison == "le") {
		if(date1.getTime() <= date2.getTime()) {
			return true;
		}
		else {
			return false;
		}
	}
	else if(comparison == "ge") {
		if(date1.getTime() >= date2.getTime()) {
			return true;
		}
		else {
			return false;
		}
	}
}

function formatCheck(dateStr) {
	dateSplit = dateStr.split("/");
	if(dateSplit.length != 3) {
		return false;
	}
	if(trimSpaces(dateSplit[0]).length <= 0 || trimSpaces(dateSplit[1]).length <= 0 || trimSpaces(dateSplit[2]).length <= 0) {
		return false;
	}
	return true;
}

function openWindow(url,window_name,winWidth,winHeight,fscroll) {
	sWidth = screen.availWidth;
	sHeight = screen.availHeight;
	

	sLeft = (sWidth - winWidth) / 2;
	sTop = (sHeight - winHeight) / 2;
	if(fscroll == '') {fscroll = 0}
	window.open(url,window_name,"width=" + winWidth + ",height=" + winHeight + ",top=" + sTop + ",left=" + sLeft + ",toolbar=0,menubar=0,status=0,scrollbars=" + fscroll + ",resizable=0");
}
function showPDF(pdfUrl) {
	sWidth = screen.availWidth;
	sHeight = screen.availHeight;
	
	winWidth = sWidth - 10;
	winHeight = sHeight - 10;
	
	sLeft = 2;
	sTop = 2;
	
	window.open(pdfUrl,"pdfURL","width=" + winWidth + ",height=" + winHeight + ",top=" + sTop + ",left=" + sLeft + ",toolbar=0,menubar=0,status=0,scrollbars=0,resizable=0");
}
function searchClicked(frm)
{
	words = trimSpaces(document.forms[0].keywords.value);
	if(words.length <= 0)
	{
		alert("Please enter keyword");
		document.forms[0].keywords.focus();
		return false;
	}
	else
	{
		if(frm=="h")
			document.forms[0].action="php/getSearchResults.php";
		if(frm=="s")
			document.forms[0].action="getSearchResults.php";
			document.forms[0].submit();
	}
}
function addNewsLetter()
{
	
	name = trimSpaces(document.forms[1].name.value);
	if(name.length <= 0) {
		alert("Please enter name");
		document.forms[1].name.focus();
		return false;
	}
	email = trimSpaces(document.forms[1].email.value);
	if(email.length <= 0) {
		alert("Please enter email");
		document.forms[1].email.focus();
		return false;
	}
	if(!checkEmail(document.forms[1].email.value))
	{
		return false;
	}
	else
	{
		document.forms[1].frmAction.value ="add";
		return true;
	}
}

function checkIfValueExists(frmObj,fldName,checkVal)
	{
		//to check if a value exists in a hidden field
		//frmobj reference to the form
		//fldname :name of the field containing the values
		//checkVal :value that has to be checked in the hidden field
		var valStr,valStrArr,totElemCount,lCtr;
		
		valStr= eval("frmObj" + "." + fldName + ".value");
		valStr = trimSpaces(valStr);
		if(valStr.length>0) //ensure that aleast once value is there
		{
			//valStr = frmObj.checkFieldValues.value;
			//alert(valStr);
			valStrArr = valStr.split(",");
			
			totElemCount = valStrArr.length;
			//alert(totElemCount);
			if(totElemCount>1) //array has been created
			{
				for(lCtr=0;lCtr<totElemCount;lCtr++)
				{
					
					//alert(valStrArr[lCtr].toUpperCase() + "==" + checkVal.toUpperCase());
					if(trimSpaces(valStrArr[lCtr].toUpperCase())==checkVal.toUpperCase())
					{
						return true;
					}
				}
			}
			else //incase there is only one value array is not created
			{
				if(trimSpaces(valStr.toUpperCase())==checkVal.toUpperCase())
					{
						return true;
					}
			}
		}
		return false;
	}