script.js

//Requirements
//There are 2 players and players take turns.
//When a player clicks Submit, the game rolls 2 dice and shows the dice rolls, for example 3 and 6.
//The player picks the order of the dice they want. For example, if they wanted the number 63, they would specify that the 2nd dice goes first. You can choose how the player specifies dice order.
//After both players have rolled and chosen dice order, the player with the higher combined number wins.

//1) a) create a dice game with 2 dices for player 1, b) let player 1 to choose which dice they want to be the first one.
//2) include player 2 and let them do same things as player 1
//3)compare the 2 dice rolls and announce the winner

//Global variables:
var GAME_STATE_ROLL_DICE = "GAME_STATE_ROLL_DICE ";
var GAME_STATE_CHOOSE_DICE_ORDER = "GAME_STATE_CHOOSE_DICE_ORDER";
var GAME_STATE_COMPARE_SCORES = "GAME_STATE_COMPARE_SCORES";
var GAME_STATE_PLAY_AGAIN = "GAME_STATE_PLAY_AGAIN";
var gameState = GAME_STATE_ROLL_DICE;
var currentPlayer = 1;
var currentPlayerRolls = []; //this array will store the currrent player rolls
var allPlayersScore = [];
var playerFinalValue = 0;
var errorMessage = "";
//Helper function "Roll the dice"
var rollDice = function () {
  var randomDecimal = Math.random() * 6;
  var randomInteger = Math.floor(randomDecimal);
  var diceRoll = randomInteger + 1;
  return diceRoll;
};

//Helper function "Roll the dice x2"
var rollDiceForPlayer = function () {
  var counter = 0;
  while (counter < 2) {
    currentPlayerRolls.push(rollDice()); // adding dice rolls to the player rolls array on line 16
    counter = counter + 1;
  }

  return (
    "Welcome Player " +
    currentPlayer +
    ". <br> <br> You rolled " +
    currentPlayerRolls[0] +
    " and " +
    currentPlayerRolls[1] +
    ".<br> <br> Now please key in 1 or 2 to choose the corresponding dice as the first digit of your final value."
  );
};
//helper function to get the player final value
var getPlayerFinalValue = function (input) {
  //input validation:
  if (input != 1 && input != 2) {
    errorMessage =
      "Error! Please only key in 1 or 2 to choose which dice to use as the first digit. Your current dice rolls are " +
      currentPlayerRolls[0] +
      " as dice 1 and " +
      currentPlayerRolls[1] +
      " as dice 2.";
    return errorMessage;
  } else {
    //condition 1 "if input == 1"
    if (input == 1) {
      playerFinalValue = Number(
        `${currentPlayerRolls[0]}` + `${currentPlayerRolls[1]}`
      );
    }

    //condition 2 "if input == 2"
    if (input == 2) {
      playerFinalValue = Number(
        `${currentPlayerRolls[1]}` + `${currentPlayerRolls[0]}`
      );
    }
    allPlayersScore.push(playerFinalValue); // add the final values to the corresponding array on line 19
    currentPlayerRolls = []; //clear the current player rolls array

    return (
      "Player " +
      currentPlayer +
      ", your final value is " +
      playerFinalValue +
      "."
    );
  }
};
var comparePlayersScore = function () {
  //player 1 wins:
  if (allPlayersScore[0] > allPlayersScore[1]) {
    return (
      "Player's 1 final value is " +
      allPlayersScore[0] +
      ". <br> <br> Player's 2 final value is " +
      allPlayersScore[1] +
      ". <br> <br> " +
      "Player 1 wins."
    );
    //player 2 wins
  } else if (allPlayersScore[1] > allPlayersScore[0]) {
    return (
      "Player's 1 final value is " +
      allPlayersScore[0] +
      ". <br> <br> Player's 2 final value is " +
      allPlayersScore[1] +
      ". <br> <br> " +
      "Player 2 wins."
    );
    // a tie:
  } else {
    return (
      "Player's 1 final value is " +
      allPlayersScore[0] +
      ". <br> <br> Player's 2 final value is " +
      allPlayersScore[1] +
      ". <br> <br> " +
      "It's a tie."
    );
  }
};
//main function
var main = function (input) {
  var myOutputMessage = "";
  if (gameState == GAME_STATE_ROLL_DICE) {
    myOutputMessage = rollDiceForPlayer(); // call the roll dice x2 function
    //cnange the game state
    gameState = GAME_STATE_CHOOSE_DICE_ORDER;

    return myOutputMessage;
  }
  if (gameState == GAME_STATE_CHOOSE_DICE_ORDER) {
    myOutputMessage = getPlayerFinalValue(input); //output the player value
    //if the input is incorrect, call the function again:
    if (myOutputMessage == errorMessage) {
      myOutputMessage = getPlayerFinalValue(input);
      return myOutputMessage;
    }

    if (currentPlayer == 1) {
      currentPlayer = 2;
      gameState = GAME_STATE_ROLL_DICE;

      return myOutputMessage + "<br> <br> It is now player's 2 turn.";
    }

    if (currentPlayer == 2) {
      gameState = GAME_STATE_COMPARE_SCORES;

      return (
        myOutputMessage +
        "<br> <br> Please click 'submit' to see the final score."
      );
    }
  }
  if (gameState == GAME_STATE_COMPARE_SCORES) {
    myOutputMessage = comparePlayersScore();
    allPlayersScore = [];

    gameState = GAME_STATE_PLAY_AGAIN;
    return myOutputMessage;
  }
  if (gameState == GAME_STATE_PLAY_AGAIN) {
    gameState = GAME_STATE_ROLL_DICE;
    currentPlayer = 1;
    myOutputMessage = main();
  }
  return myOutputMessage;
};