var theSymbols = [" ", "!", "\"", "$", "%", "^", "&", "*", "(", ")", "-", "_", "=", "+", "[", "{", "]", "}", ";", ":", "'", "@", "#", "~", "|", ",", "<", ".", ">", "/", "?"]; //Removed "\\", because backslash character can cause problems when passwords are stored.

function GeneratePassword(lengthOfPassword, wantSymbols) {
    var theLetters = "abcdefghijklmnopqrstuvwxyz";
    var StrongPasswordArray = [];
    for (var i = 0; i < lengthOfPassword; i++) {
        var capitalise = Math.round(Math.random() * 1);
        if (capitalise === 0) {
            StrongPasswordArray[i] = theLetters.charAt(Math.round(Math.random() * 25)).toUpperCase();
        }
        else {
            StrongPasswordArray[i] = theLetters.charAt(Math.round(Math.random() * 25));
        }
    }
    var numberOfDigits;
    numberOfDigits = Math.round(Math.random() * (lengthOfPassword - 1)) + 1;
    for (i = 0; i < numberOfDigits; i++) {
        var positionForNumeric = Math.round(Math.random() * (lengthOfPassword - 1));
        var theNumber = Math.round(Math.random() * 9);
        StrongPasswordArray[positionForNumeric] = theNumber;
    }
    if (wantSymbols) {
        var numberOfSymbols;
        numberOfSymbols = Math.round(Math.random() * (lengthOfPassword - 1)) + 1;
        var positionForSymbol;
        var locationOfSymbolInArray;
        var theSymbol;
        for (i = 0; i < numberOfSymbols; i++) {
            positionForSymbol = Math.round(Math.random() * (lengthOfPassword - 1)); 
            locationOfSymbolInArray = Math.round(Math.random() * (theSymbols.length - 1));
            theSymbol = theSymbols[locationOfSymbolInArray];
            StrongPasswordArray[positionForSymbol] = theSymbol;
        }
    }
    return StrongPasswordArray;
}

function Validate(StrongPasswordArray, lengthOfPassword, wantSymbols) {
    var hasAnUpperCaseLetter = false;
    var hasALowerCaseLetter = false;
    var hasANumber = false;
    var hasASymbol = false;
    var correctLength = false;
    for (var i = 0; i < StrongPasswordArray.length; i++) {
        if ("A" <= StrongPasswordArray[i] && StrongPasswordArray[i] <= "Z") {
            hasAnUpperCaseLetter = true;
            break;
        }
    }
    for (i = 0; i < StrongPasswordArray.length; i++) {
        if ("a" <= StrongPasswordArray[i] && StrongPasswordArray[i] <= "z") {
            hasALowerCaseLetter = true;
            break;
        }
    }
    for (i = 0; i < StrongPasswordArray.length; i++) {
        if ("0" <= StrongPasswordArray[i] && StrongPasswordArray[i] <= "9") {
            hasANumber = true;
            break;
        }
    }
    if (wantSymbols) {
        for (i = 0; i < StrongPasswordArray.length; i++) {
            for (var iSymbols = 0; iSymbols < theSymbols.length; iSymbols++) 
            {
                if (StrongPasswordArray[i] == theSymbols[iSymbols]) {
                    hasASymbol = true;
                    break;
                }
            }
        }
    }
    if (StrongPasswordArray.length == lengthOfPassword) {
        correctLength = true;
    }
    if (!wantSymbols) {
        hasASymbol = true;
    }
    if (!hasAnUpperCaseLetter || !hasALowerCaseLetter || !hasANumber || !hasASymbol || !correctLength) {
        lengthOfPassword = "";
        loop = "";
        hasAnUpperCaseLetter = "";
        hasALowerCaseLetter = "";
        hasANumber = "";
        hasASymbol = "";
        correctLength = "";
        return false;
    }
    else {
        return true;
    }
}

function MakeMnemonic(StrongPasswordArray) {
    var theWords = [];
    theWords = ["alpha", "bravo", "charlie", "delta", "echo", "foxtrot", "golf", "hotel", "india", "juliet", "kilo", "lima", "mike", "november", "oscar", "papa", "quebec", "romeo", "sierra", "tango", "uniform", "victor", "whiskey", "x-ray", "yankee", "zulu"];
    var lettersArray = [];
    lettersArray = ["a", "b", "c", "d", "e", "f", "g", "h", "i", "j", "k", "l", "m", "n", "o", "p", "q", "r", "s", "t", "u", "v", "w", "x", "y", "z"];
    var easyToRememberArray = [];
    for (var i = 0; i < StrongPasswordArray.length; i++) {
        for (var iLetters = 0; iLetters < lettersArray.length; iLetters++) {
            if (StrongPasswordArray[i] == lettersArray[iLetters].toUpperCase()) {
                easyToRememberArray[i] = theWords[iLetters].toUpperCase() + "\n";
            }
            if (StrongPasswordArray[i] == lettersArray[iLetters]) {
                easyToRememberArray[i] = theWords[iLetters] + "\n";  
            }
        }
        if ("0" <= StrongPasswordArray[i] && StrongPasswordArray[i] <= "9") {
            easyToRememberArray[i] = StrongPasswordArray[i];
        }
        for (var iSymbols = 0; iSymbols < theSymbols.length; iSymbols++) {
            if (StrongPasswordArray[i] == theSymbols[iSymbols]) {
                easyToRememberArray[i] = StrongPasswordArray[i];
                /* use "[space]" to represent a space character */
                if (StrongPasswordArray[i] === " ") {
                    easyToRememberArray[i] = "[space]";
                }
            }
        }
    }
    var easyToRemember = "";
    for (i = 0; i < easyToRememberArray.length; i++) {
        easyToRemember += easyToRememberArray[i] + " ";
    }
    return easyToRemember;
}

function displayPassword() {
    var newStrongPasswordArray;
    var passwordIsOK = false;
    while (!passwordIsOK) {
        newStrongPasswordArray = GeneratePassword(document.getElementById("ddlLength").options[document.getElementById("ddlLength").selectedIndex].value, document.getElementById("chkSymbols").checked);
        passwordIsOK = Validate(newStrongPasswordArray, document.getElementById("ddlLength").options[document.getElementById("ddlLength").selectedIndex].value, document.getElementById("chkSymbols").checked);
    }
    var StrongPassword = "";
    for (var i = 0; i < newStrongPasswordArray.length; i++) {
        StrongPassword += newStrongPasswordArray[i];
    }
    document.getElementById("outputPassword").replaceChild(document.createTextNode(StrongPassword), document.getElementById("outputPassword").firstChild);
    document.getElementById("outputPassword").focus();
    document.getElementById("outputMnemonic").replaceChild(document.createTextNode(MakeMnemonic(newStrongPasswordArray)), document.getElementById("outputMnemonic").firstChild);
}

function addEventHandlers() {
    if (document.getElementById) {
        if (document.getElementById("btnGenerate")) {
            document.getElementById("btnGenerate").onclick = displayPassword;
        }
    }
}