function generatePassword() 
{	
	var passInfo = passwordInfo();
	var passLengthMax = 50;
	passInfo.passLength = document.passform.passwordLength.value;
	if(passInfo.passLength > passLengthMax)
	{
		showMsg("Please provide password length less than "+passLengthMax); // No I18N
		return;	
	}
	//passInfo.specialCharacters = document.passform.splcharstext.value;
	passInfo.useNumbers = document.passform.numbers.checked;
	passInfo.useLowerCaseAlphabets = document.passform.lowercase.checked;
	passInfo.useUpperCaseAlphabets = document.passform.uppercase.checked;
	//passInfo.useSpecialCharacters = document.passform.ownspecialchars.checked;
	passInfo.useDefaultSpecialChars = document.passform.defaultspecialchars.checked;
	passInfo.avoidAmbiguousChars = document.passform.avoidAmbiguous.checked;
	var password = PasswordGenerator.generatePass(passInfo);
	document.passform.password.value = password;
	copyPassword(document.getElementById('password'));
}

var PasswordGeneratorConstants = {
	LOWER_CASE : "abcdefghijklmnopqrstuvwxyz", // No I18N
	UPPER_CASE : "ABCDEFGHIJKLMNOPQRSTUVWXYZ", // No I18N
	NUMBERS	   : "0123456789",
	LOWER_CASE_NON_AMBIGUOUS : "abcdefghijkmnpqrstuvwxyz", // No I18N
	UPPER_CASE_NON_AMBIGUOUS : "ABCDEFGHJKLMNPQRSTUVWXYZ", // No I18N
	NUMBERS_NON_AMBIGUOUS	 : "23456789",
	DEFAULT_SPL_CHARS	 : "[email protected]#$%^&*()"
}

var passwordInfo = function PasswordInfo(){
    	this.passLength;
	//this.specialCharacters;
	this.useNumbers;
	this.useLowerCaseAlphabets;
	this.useUpperCaseAlphabets;
	this.useDefaultSpecialChars;
	//this.useSpecialCharacters;
	this.avoidAmbiguousChars;
	return this;
}	

var PasswordGenerator ={};

PasswordGenerator.generatePass = function(passwordInfo){

	var length = passwordInfo.passLength;
	var charset = "";
	var password = "";
	if(passwordInfo.avoidAmbiguousChars)
	{
		if(passwordInfo.useNumbers)
		{
			password += PasswordGeneratorConstants.NUMBERS_NON_AMBIGUOUS.charAt(Math.round(Math.random() * (PasswordGeneratorConstants.NUMBERS_NON_AMBIGUOUS.length-1)));
			length -= 1;
			charset = charset+PasswordGeneratorConstants.NUMBERS_NON_AMBIGUOUS;
		}
		if(passwordInfo.useLowerCaseAlphabets)
		{
			password += PasswordGeneratorConstants.LOWER_CASE_NON_AMBIGUOUS.charAt(Math.round(Math.random() * (PasswordGeneratorConstants.LOWER_CASE_NON_AMBIGUOUS.length-1)));
			length -= 1;
			charset = charset+PasswordGeneratorConstants.LOWER_CASE_NON_AMBIGUOUS;
		}
		if(passwordInfo.useUpperCaseAlphabets)
		{
			password += PasswordGeneratorConstants.UPPER_CASE_NON_AMBIGUOUS.charAt(Math.round(Math.random() * (PasswordGeneratorConstants.UPPER_CASE_NON_AMBIGUOUS.length-1)));
			length -= 1;
			charset = charset+PasswordGeneratorConstants.UPPER_CASE_NON_AMBIGUOUS;
		}
	}	
	else
	{
		if(passwordInfo.useNumbers)
		{
			password += PasswordGeneratorConstants.NUMBERS.charAt(Math.round(Math.random() * (PasswordGeneratorConstants.NUMBERS.length-1)));
			length -= 1;
			charset = charset+PasswordGeneratorConstants.NUMBERS;
		}
		if(passwordInfo.useLowerCaseAlphabets)
		{
			password += PasswordGeneratorConstants.LOWER_CASE.charAt(Math.round(Math.random() * (PasswordGeneratorConstants.LOWER_CASE.length-1)));
			length -= 1;
			charset = charset+PasswordGeneratorConstants.LOWER_CASE;
		}
		if(passwordInfo.useUpperCaseAlphabets)
		{
			password += PasswordGeneratorConstants.UPPER_CASE.charAt(Math.round(Math.random() * (PasswordGeneratorConstants.UPPER_CASE.length-1)));
			length -= 1;
			charset = charset+PasswordGeneratorConstants.UPPER_CASE;
		}
	}
	/*if(passwordInfo.useSpecialCharacters && document.passform.splcharstext.value != "")
	{
		password += passwordInfo.specialCharacters.charAt(Math.round(Math.random() * (passwordInfo.specialCharacters.length-1)));
		length -= 1;
		charset = charset+passwordInfo.specialCharacters;
	}
	else */
	if(passwordInfo.useDefaultSpecialChars)
	{
		password += PasswordGeneratorConstants.DEFAULT_SPL_CHARS.charAt(Math.round(Math.random() * (PasswordGeneratorConstants.DEFAULT_SPL_CHARS.length-1)));
		length -= 1;
		charset = charset+PasswordGeneratorConstants.DEFAULT_SPL_CHARS;
	}
	
	//Shuffling the charset
	var shuffledCharSet = "";
        var stringLength = charset.length;
        for(var i=0; i < stringLength;i++)
        {
                var randomNumber = Math.round(Math.random() * (charset.length-1));
                if(randomNumber == charset.length-1)
                {
                        shuffledCharSet += charset.charAt(randomNumber);
                        charset = charset.slice(0, randomNumber)
                }
                else
                {
                        shuffledCharSet += charset.charAt(randomNumber);
                        charset = charset.slice(0, randomNumber) + charset.slice(randomNumber+1);
                }
        }

	//picking the remaining characters for password
    	for (var i = 0, n = shuffledCharSet.length; i < length; ++i) 
	{
		var randomNumber = Math.round(Math.random() * (n-1));
		password += shuffledCharSet.charAt(randomNumber);
    	}

	//shuffling the final password
	var shuffledPass = "";
        var passLength = password.length;
        for(var i=0; i < passLength;i++)
        {
                var randomNumber = Math.round(Math.random() * (password.length-1));
                if(randomNumber == password.length-1)
                {
                        shuffledPass += password.charAt(randomNumber);
                        password = password.slice(0, randomNumber)
                }
                else
                {
                        shuffledPass += password.charAt(randomNumber);
                        password = password.slice(0, randomNumber) + password.slice(randomNumber+1);
                }
         }

     return shuffledPass;
}

function copyPassword(passElement) 
{
    var selectionStart, selectionEnd;
    target = passElement;
    selectionStart = passElement.selectionStart;
    selectionEnd = passElement.selectionEnd;
    var currentFocus = document.activeElement;
    target.focus();
    target.setSelectionRange(0, target.value.length);
    
    var success;
    try 
    {
    	  success = document.execCommand("copy");
    } 
    catch(e) 
    {
        success = false;
    }

    if (currentFocus && typeof currentFocus.focus === "function") {
        currentFocus.focus();
    }
   
    passElement.setSelectionRange(selectionStart, selectionEnd);
    
    var message = "";
    if (!success) 
    {
        	message = "Copy is not supported by the browser"
    } 
    else 
    {
	        message = "Copied the password successfully!"
    }
    showMsg(message);
}

function showMsg(message)
{
	document.getElementById("message").innerHTML = message;
    	setTimeout(function() {
        document.getElementById("message").innerHTML = "";
    	}, 3000);	
}