Add code for tutorial 5

game-logic.js

 const gameState = {
     playerWallet: 100,
     currentBet: null,
-    cards: [[], []]
+    cards: [[], []],
+    hiddenCard: null
 }
 
 function collectBet(){
@@ -31,24 +32,52 @@ function drawCard(){
     return rndNum;
 }
 
+function handValue(cards){
+    let sum = 0;
+    let aces = 0;
+    for (let i = 0; i < cards.length; i++){
+        sum = sum + cards[i];
+        if (cards[i] == 11){
+            aces++;
+        } 
+    }
+    while (sum > 21 && aces > 0){
+        sum = sum - 10;
+        aces--;
+    }
+
+    return sum;
+}
+
 function blackjack(){
     // decide the bet, collect it
     gameState.currentBet = collectBet();
 
+    // we deal the first 2 cards for the player
+    // we deal the first 2 cards for the dealer
+    // one is hidden
     for(let playerIndex = 0; playerIndex < gameState.cards.length; playerIndex++){
         for(let cardIndex = 0; cardIndex < 2; cardIndex++){
+            if (cardIndex === 1 && playerIndex === 1){
+                gameState.hiddenCard = drawCard();
+            } else {
                 gameState.cards[playerIndex][cardIndex] = drawCard();
             }
         }
+    }
 
-    console.log(gameState.cards);
+    let curPlayerScore = handValue(gameState.cards[0]);
+    let curDealerScore = handValue(gameState.cards[1]);
+
+    console.log(`Player score is ${curPlayerScore}, Dealer score is ${curDealerScore}`);
 
-    // we deal the first 2 cards for the player
     // check immediately that the player has blackjack
     // if so, we need to pay 2.5 the bet -> end the game
-
-    // we deal the first 2 cards for the dealer
-    // one is hidden
+    if (curPlayerScore === 21){
+        console.log('Player has blackjack!');
+        gameState.playerWallet += gameState.currentBet*2.5;
+        return true;
+    }
 
     // REPEAT THIS ------
     // player makes a choice: hit or stand
@@ -58,6 +87,23 @@ function blackjack(){
     // if new score > 21 player loses -> end the game
     // --- UNTIL THE PLAYER stands
 
+    while(curPlayerScore < 21){
+        let threshold = (21 - curPlayerScore) / 21;
+        let likelihood = Math.random();
+        if (likelihood < threshold){
+            console.log('Player hitting a new card');
+            let curCard = drawCard();
+            gameState.cards[0].push(curCard);
+            curPlayerScore = handValue(gameState.cards[0]);
+            console.log(`Player got ${curCard} and the current score is ${curPlayerScore}`);
+        } else {
+            console.log('Player is not taking any more card');
+            break;
+        }
+    }
+
+    console.log(gameState.cards[0]);
+
     // show the hidden card of the dealer
     // REPEAT THIS -----
     // If dealer has less than 17