script.js

//
// Blackjack
// by Cukac
//

// card variables
let suits = ["Hearts", "Clubs", "Diamonds", "Spades"];
let values = ["Ace", "King", "Queen", "Jack", "Ten", "Nine", "Eight", "Seven", "Six", "Five", "Four", "Three", "Two"];

// DOM variables
let textArea = document.getElementById("text-area");
let newGameButton = document.getElementById("new-game-button");
let hitButton = document.getElementById("hit-button");
let stayButton = document.getElementById("stay-button");

// Game variables
let gameStarted = false,
    gameOver = false,
    playerWon = false,
    dealerCards = [],
    playerCards = [],
    dealerScore = 0,
    playerScore = 0,
    deck = [];

hitButton.style.display = "none";
stayButton.style.display = "none";
showStatus();


// Izvlačenje KARTE

function getNextCard() {
  return deck.shift();
}

//
// NEW GAME BUTTON
//

newGameButton.addEventListener("click", function() {
  gameStarted = true,
  gameOver = false,
  playerWon = false,
  
  deck = createDeck();
  shuffleDeck(deck);
  dealerCards = [ getNextCard(), getNextCard() ];
  playerCards = [ getNextCard(), getNextCard() ];
  
  textArea.innerText = "Game in progress...\n \n";
  newGameButton.style.display = "none";
  hitButton.style.display = "inline";
  stayButton.style.display = "inline";
  checkForEndOfGame();
    showStatus();
});

hitButton.addEventListener("click", function() {
  playerCards.push(getNextCard());
  checkForEndOfGame();
  showStatus();
});

stayButton.addEventListener("click", function() {
  gameOver = true;
  checkForEndOfGame();
  showStatus();
});

// Deck creation

function createDeck() {
    let deck = [];
    for (let suitIdx = 0; suitIdx < suits.length; suitIdx++) {
        for (let valueIdx = 0; valueIdx < values.length; valueIdx++) {
            let card = {
              suit: suits[suitIdx],
              value: values[valueIdx]
            };
        deck.push( card );
        }
    }
    return deck;
}

// Deck Shuffling

function shuffleDeck(deck) {
  for (let i = 0; i < deck.length; i++) {
    let swapIdx = Math.trunc(Math.random() * deck.length);
    let tmp = deck[swapIdx];
    deck[swapIdx] = deck[i];
    deck[i] = tmp;
  }
}

// Dobivanje STRINGA

function getCardString(card) {
    return card.value + " of " + card.suit;
}

function getCardNumericValue(card) {
  switch(card.value) {
    case "Ace":
      return 1;
    case "Two":
      return 2;
    case "Three":
      return 3;
    case "Four":
      return 4;
    case "Five":
      return 5;
    case "Six":
      return 6;
    case "Seven":
      return 7;
    case "Eight":
      return 8;
    case "Nine":
      return 9;
    default:
      return 10;
  }
}

function getScore(cardArray) {
  let score = 0;
  let hasAce = false;
  for (let i=0; i<cardArray.length; i++) {
    let card = cardArray[i];
    score += getCardNumericValue(card);
    if (card.value === "Ace") {
      hasAce= true;
    }
  }
  if (hasAce && score + 10 <= 21) {
    return score + 10;
  }
  return score;
}

function updateScores() {
  dealerScore = getScore(dealerCards);
  playerScore = getScore(playerCards);
}

function checkForEndOfGame() {
  
  updateScores();
    
  if (playerScore === 21) {
      playerWon = true;
      gameOver = true;
  }
    
  if (gameOver) {
    // let dealer take cards
    while(dealerScore < playerScore && playerScore <= 21 && dealerScore <= 18) {
      dealerCards.push(getNextCard());
      updateScores();
    }
  }
  
  if (playerScore > 21) {
    playerWon = false;
    gameOver = true;
  }
  else if (dealerScore > 21) {
    playerWon = true;
    gameOver = true;
  }
  else if (gameOver) {
    
    if (playerScore >= dealerScore) {
      playerWon = true;
    }
    else {
      playerWon = false;
    }
  }
}
//
// STATUS
//
function showStatus() {
  if (!gameStarted) {
  textArea.innerText = "Welcome to Blackjack!";
  return;
  }
  let dealerCardString = " ";
  for (let i=0; i < dealerCards.length; i++) {
    dealerCardString += getCardString(dealerCards[i]) + "\n";
  }
  
  let playerCardString = " ";
  for (let i=0; i < playerCards.length; i++) {
    playerCardString += getCardString(playerCards[i]) + "\n";
  }
  
  updateScores();
  
  textArea.innerText = "Dealer has:\n" + 
                        dealerCardString + 
                        "(score: " + dealerScore + ")\n\n" +
                        
                        "Player has:\n" + 
                        playerCardString + 
                        "(score: " + playerScore + ")\n\n";
  
  if (gameOver) {
    if (playerWon) {
      textArea.innerText += "YOU WIN!";
    }
    else {
      textArea.innerText += "DEALER WINS";
    }
    newGameButton.style.display = "inline";
    hitButton.style.display = "none";
    stayButton.style.display = "none";
  }
}