var userChoice = "";
var computerChoice = "";
var translate = 0;
var noWinner = true;


function verifyChoice(a){
      if((a === "rock") || (a ===  "paper") || (a === "scissors")){
        return 0;
      }
      else {
        return 1;
      }
};


function computerRandom(){
  translate = Math.random();
  if(translate < 0.34){
    return "rock";
  }
  else if(translate <= 0.67){
    return "paper";
  }
  else{
    return "scissors";
  }
};

//returns true if choice wins
function compare(choice, computerChoice){
    if ((choice === "rock"      && computerChoice === "scissors")||
        (choice === "paper"     && computerChoice === "rock")||
        (choice === "scissors"  && computerChoice === "paper")){
            return 1;
        } else {
            return 0;
        }
};


do{
    userChoice = prompt("Do you choose rock, paper or scissors?");
    if(verifyChoice(userChoice)){
        computerChoice = computerRandom();
        confirm("Computer chose: " + computerChoice);
        if(computerChoice === userChoice){
            confirm("It's a tie! Try again!");
        }else if(compare(userChoice,computerChoice)){
            confirm("You win!");
            noWinner = false;
        }else{
            confirm("Computer wins, you suck!");
            noWinner = false;
        }
    }else{
        confirm("That is not a valid option");
    }
}while(noWinner);