// Password strength meter
// This jQuery plugin is written by Firas Kassem [2007.04.05] and modified by Amin Rajaee [2009.07.26]
// Firas Kassem  phiras.wordpress.com || phiras at gmail {dot} com
// Amin Rajaee  rajaee at gmail (dot) com

// for more information : http://phiras.wordpress.com/2007/04/08/password-strength-meter-a-jquery-plugin/


function passwordStrength(password,username)
{
    function getObj(msg,score) {
        return {
            "msg": msg,
            "score": parseInt(score+0.5)
        };
    }
    
    var shortPass = '<span style="color:red">Очень короткий</span>';
    var badPass = '<span style="color:red">Слабый</span>';
    var goodPass = '<span style="color:orange">Средний</span>';
    var strongPass = '<span style="color:green">Сильный</span>';
    var sameAsUsername = '<span style="color:red">Очень слабый</span>';
    
    var score = 0;
    
    //password < 4
    if (password.length < 4 ) {
        return getObj(shortPass,score);
    }
    
    //password == username
    if (password.toLowerCase() == username.toLowerCase()) {
        return getObj(sameAsUsername, score);
    }
    
    //password length
    score += password.length * 1;
    score += ( checkRepetition(1,password).length - password.length ) * 0.25;
    score += ( checkRepetition(2,password).length - password.length ) * 0.25;
    score += ( checkRepetition(3,password).length - password.length ) * 0.25;
    score += ( checkRepetition(4,password).length - password.length ) * 0.25;

    //password has 2 numbers
    if (password.match(/(.*[0-9].*[0-9])/)) {
        score += 5;
    }
    
    //password has 2 sybols
    if (password.match(/(.*[!,@,#,$,%,^,&,*,?,_,~].*[!,@,#,$,%,^,&,*,?,_,~])/)) {
        score += 5;
    }
    
    //password has Upper and Lower chars
    if (password.match(/([a-z].*[A-Z])|([A-Z].*[a-z])/)) {
        score += 30;
    }
    
    //password has number and chars
    if (password.match(/([a-zA-Z])/) &&
            password.match(/([0-9])/)) {
        score += 30;
    }
    
    //password has number and symbol
    if (password.match(/([!,@,#,$,%,^,&,*,?,_,~])/) &&
            password.match(/([0-9])/)) {
        score += 15;
    }
    
    //password has char and symbol
    if (password.match(/([!,@,#,$,%,^,&,*,?,_,~])/) &&
            password.match(/([a-zA-Z])/)) {
        score += 15;
    }
    
    //password is just a nubers or chars
    if (password.match(/^\w+$/) ||
            password.match(/^\d+$/) ) {
        score -= 0;
    }
    
    //verifing 0 < score < 100
    if ( score < 0 ) {
        score = 0;
    }
    if ( score > 100 ) {
        score = 100;
    }
    
    if (score < 34 ) {
        return getObj(badPass, score);
    }
    if (score < 68 ) {
        return getObj(goodPass, score);
    }
    
    return getObj(strongPass, score);
}

function checkRepetition(pLen,str) {
    res = ""
    for ( i=0; i<str.length ; i++ ) {
        repeated=true
        for (j=0;j < pLen && (j+i+pLen) < str.length;j++)
            repeated=repeated && (str.charAt(j+i)==str.charAt(j+i+pLen))
        if (j<pLen) repeated=false
        if (repeated) {
            i+=pLen-1;
            repeated=false;
        }
        else {
            res+=str.charAt(i)
        }
    }
    return res;
}