/*
validations.js: common file for javascript validations & other fn's
Author: rakesh
*/

// Remove the trailing and leading spaces 

function f_trimmer(thisstring){
   	while(thisstring.charAt(0)==" "){
       thisstring=thisstring.substring(1,thisstring.length);
   	}
   	return thisstring;
	}


// check if value is valid email address
function isValidEmailAddr(value){
	return ((/^\w+([\.-]?\w+)*@\w+([\.-]?\w+)*(\.\w{2,3})+$/.test(value)));
}


// check if value contains alphabets, digits & underscore(_)
function isValidUserName(value){
	return ((/^\w+$/.test(value)));
}

// check if value contains alphabets & spaces
function isValidAlphaSpace(value){
	return ((/^[a-zA-Z]|\s+$/.test(value)));	
}

// check if value contains only alphabets
function isValidAlphabet(value){
	return((/^[a-zA-Z]+$/.test(value)));	
}

// check if value contains only Numbers
function isNumeric(value){
	return ((/^\d+$/.test(value)));	
}

// check if value contains valid currency i.e. (1223.34) only 2 digits after dot(.)
//currency can also be without digits
function isCurrency(value){
	return((/^(\d+(\.\d{1,2})*)$/.test(value)));
}

function areNotValidSpecialChars(value,spchar){

   var p = spchar;
   var fl = "";
   var t = value;
	var rp;
	rp = "\\"+spchar.charAt(0);
	for(var i=1;i<spchar.length;i++){
		rp += "|\\"+spchar.charAt(i);
	}

       if(value.match(rp)){
        	return false;
       }

     return true;
}



/* FUNCTION TO VALIDATE DATE IN MM-DD-YYYY FORMAT */

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 isDate(dtStr){
	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)
		   alert("Please enter a valid 4 digit year")
		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 ValidateDate(dategot){
	var dt=dategot;
	if (isDate(dt.value)==false){		
		return false
	}
    return true
 } 

/* FUNCTION TO VALIDATE DATE IN MM-DD-YYYY FORMAT ends here */ 

/* Function to validate the expiry date of crdit card in th format MM/YY entered as a string */

 function ValidateExpiryDate(expmonthgot,expyeargot){

  	  var month= expmonthgot;  	 
  	  var year= expyeargot;  	 
  	  var today = new Date();  	 
  	  var expiry = new Date(year,month);
  	 
	 if (today.getTime() > expiry.getTime()){
		    alert("The expiry date should be greater than the current date");		       	
			return false;
	 }			 	  
	  return true;

}