var getRandomInt = function (min, max)
{
  return Math.floor(Math.random() * (max - min)) + min;
}

var compareChoice = function (choice1, choice2)
{
    if (compareValueChoice("Paper", "Rock", choice1, choice2))
    {
        return ("Paper wins");
    }
    else if (compareValueChoice("paper", "Scissors", choice1, choice2))
    {
        return ("Scissors wins");
    }
    else if (compareValueChoice("Scissors", "Rock", choice1, choice2))
    {
        return ("Rock wins");
    }
    return ("Tie");
}

var compareValueChoice = function (value1, value2, choice1, choice2)
{
    if (value1 === choice1 && value2 === choice2)
    {
        return true;
    }
    else if (value1 === choice2 && value2 === choice1)
    {
        return true;
    }
    return false;
}

var playGame = function ()
{
    var userChoice = ""
    while (userChoice != "Rock" || userChoice != "Paper" || userChoice != "Scissors")
    {
        userChoice =  prompt("Do you choose Rock, Paper or Scissors?");
    }
    console.log("You chose " + userChoice);

    var aiChoice = ""
    switch(getRandomInt(1, 4))
    {
        Case 1:
            aiChoice = "Rock";
            break;
        Case 2:
            aiChoice = "Paper";
            break;
        case 3:
            aiChoice = "Scissors";
            break;
    }
    console.log("Computer chose " + aiChoice);

    return compareChoice(userChoice, aiChoice)
}

 var result = ""
 do
 {
     result = playGame()
 } while (result == "Tie")