function getUserChoice() {
  var userInput = prompt('Rock, Paper, or Scissors?');

  userInput = userInput.toLowerCase();

  if (userInput === 'rock' || userInput === 'paper' || userInput === 'scissors' || userInput === 'bomb') {
    return userInput;
  } else {
    console.log('Error!');
  }
}

function getComputerChoice() {
var randomNumber = Math.floor(Math.random() * 3);
  switch (randomNumber) {
    case 0:
      return 'rock';
    case 1:
      return 'paper';
    case 2:
      return 'scissors';
      break;
  }
}

function determineWinner(userChoice, computerChoice) {
  if (userChoice === computerChoice) {
    return 'Tie Game';
  } else {
  if (userChoice === 'rock') {
    if (computerChoice ==='paper') {
      return 'Computer wins.';
    } else {
      return 'You win!';
    }
  } else {
    if (userChoice === 'paper') {
      if (computerChoice === 'scissors') {
        return 'Computer wins.';
      } else {
        return 'You win!';
      }
  } else {
    if (userChoice === 'scissors') {
      if (computerChoice === 'rock') {
        return 'Computer wins.';
      } else {
        return 'You win!';
      }
    }
  }
  }
  }
}

function playGame() {
  var userChoice = getUserChoice();
  var computerChoice = getComputerChoice();
  console.log('You threw: ' + userChoice);
  console.log('The computer threw: ' + computerChoice);
  console.log(determineWinner(userChoice, computerChoice));
}

playGame();