// Password strength meter v1.0
// Matthew R. Miller - 2007
// www.codeandcoffee.com
// Based off of code from  http://www.intelligent-web.co.uk

// Settings
// -- Toggle to true or false, if you want to change what is checked in the password
var bCheckNumbers = true;
var bCheckUpperCase = true;
var bCheckLowerCase = true;
var bCheckPunctuation = true;
var nPasswordLifetime = 365;

// Check password
function checkPassword(strPassword)
	{
	// Reset combination count
	nCombinations = 0;
	
	// Check numbers
	if (bCheckNumbers)
		{
		strCheck = "0123456789";
		if (doesContain(strPassword, strCheck) > 0)
			{
			nCombinations += strCheck.length;
			}
		}
	
	// Check upper case
	if (bCheckUpperCase)
		{
		strCheck = "ABCDEFGHIJKLMNOPQRSTUVWXYZ";
		if (doesContain(strPassword, strCheck) > 0) 
			{
			nCombinations += strCheck.length;
			}
		}
	
	// Check lower case
	if (bCheckLowerCase)
		{
		strCheck = "abcdefghijklmnopqrstuvwxyz";
		if (doesContain(strPassword, strCheck) > 0) 
			{
			nCombinations += strCheck.length;
			}
		}
	
	// Check punctuation
	if (bCheckPunctuation)
		{
		strCheck = ";:-_=+\|//?^&!.@$£#*()%~<>{}[]çÇñÑ";
		if (doesContain(strPassword, strCheck) > 0) 
			{
			nCombinations += strCheck.length;
			}
		}

	// Calculate
	// -- 500 tries per second => minutes 
	var nDays = ((Math.pow(nCombinations, strPassword.length) / 500) / 2) / 86400;
	// Number of days out of password lifetime setting
	var nPerc = nDays / nPasswordLifetime;
	return nPerc;
	}
 
// Runs password through check and then updates GUI 
function runPassword(strPassword, strFieldID)
	{
	// Check password
	nPerc = checkPassword(strPassword);
	// Get controls
	var ctlBar = document.getElementById(strFieldID + "_bar");
	var ctlText = document.getElementById(strFieldID + "_text");
	if (!ctlBar || !ctlText) return;
	// Set new width
	var nRound = Math.round(nPerc * 100);
	if (nRound < (strPassword.length * 5)) 
		{
		nRound += strPassword.length * 5; 
		}
	if (nRound > 100)
		{
		nRound = 100;
		}
	ctlBar.style.width = nRound + "%";
	// Color and text
	if (nRound > 95)
		{
		strText = "Excelente ("+nRound+ "%)";
		strColor = "#3bce08";
		}
	else if (nRound > 30)
		{
		strText = "Bueno ("+nRound+ "%)";
		strColor = "orange";
		}
	else if (nRound > 20)
		{
		strText = "Malo ("+nRound+ "%)";
		strColor = "#ffd801";
		}
	else
		{
		strColor = "red";
		strText = "Inseguro ("+nRound+ "%)";
		}
	ctlBar.style.backgroundColor = strColor;
	ctlText.innerHTML = "<span style='color: " + strColor + ";'>" + strText + "</span>";
	}
 
// Checks a string for a list of characters
function doesContain(strPassword, strCheck)
 {
	nCount = 0;
	for (i = 0; i < strPassword.length; i++) 
		{
		if (strCheck.indexOf(strPassword.charAt(i)) > -1)
			{
			nCount++;
			}
		}
	return nCount; 
	}