3단계 - 블랙잭(딜러)

README.md

@@ -14,6 +14,9 @@
   - 카드를 더 줄 때마다 해당 player가 갖고있는 카드를 출력한다. 
 - 모든 플레이어가 카드를 더 이상 받지 않으면 결과를 출력한다.
   - 결과는 플레이어별로 갖고 있는 카드의 목록과 점수를 출력한다.
+- 딜러는 처음에 받은 2장의 합계가 16이하이면 반드시 1장의 카드를 추가로 받아야 하고, 17점 이상이면 추가로 받을 수 없다. 
+- 딜러가 21을 초과하면 그 시점까지 남아 있던 플레이어들은 가지고 있는 패에 상관 없이 승리한다. 
+- 게임을 완료한 후 각 플레이어별로 승패를 출력한다.
 
 ## 테스트 구현 목록
 - [x] Test 1 : Player 객체에 이름을 부여할 수 있다.
@@ -32,4 +35,7 @@
   - view라서 테스트 미구현
 - [x] Test 4 : Player별 점수를 계산할 수 있다.
   - card의 리스트를 감싼 Cards 객체에게 점수 계산을 위임
+- [x] Test 5 : 딜러의 점수가 17점 이상이면 추가로 카드를 받을 수 없다.
+  - Dealer가 Player를 상속하도록 하고 addCard 로직을 바꿔서 구현
+- 
 

src/main/kotlin/blackjack/BlackJackGame.kt

@@ -1,6 +1,7 @@
 package blackjack
 
 import blackjack.domain.Dealer
+import blackjack.domain.Distributor
 import blackjack.domain.Player
 import blackjack.domain.Players
 import blackjack.domain.card.CardDeck
@@ -14,30 +15,44 @@ class BlackJackGame {
         val players = Players(names)
         DisplayView.dealOutCards(players)
 
-        val dealer = Dealer(CardDeck())
-        dealer.dealOutCards(players)
-        DisplayView.cardsOfPlayers(players)
+        val distributor = Distributor(CardDeck())
+        val dealer = Dealer()
 
-        dealOutAdditionalCards(dealer, players)
-        DisplayView.result(players)
+        distributor.dealOutCards(dealer, players)
+        DisplayView.cardsOfPlayers(dealer, players)
+
+        dealOutAdditionalCards(distributor, players)
+        dealOutAdditionalCard(distributor, dealer)
+        DisplayView.finalScore(dealer, players)
+
+        GameResultCalculator.getResult(dealer, players)
+        DisplayView.result(dealer, players)
     }
 
-    private fun dealOutAdditionalCards(dealer: Dealer, players: Players) {
+    private fun dealOutAdditionalCards(distributor: Distributor, players: Players) {
         players.players.forEach {
-            dealOutAdditionalCard(dealer, it)
+            dealOutAdditionalCard(distributor, it)
         }
     }
 
-    private fun dealOutAdditionalCard(dealer: Dealer, player: Player) {
+    private fun dealOutAdditionalCard(distributor: Distributor, player: Player) {
         DisplayView.dealOutAdditionalCard(player)
         if (InputView.inputAdditionalCard() == "y") {
-            dealer.dealOutCard(player)
-            takeAnotherCard(dealer, player)
+            distributor.dealOutCard(player)
+            takeAnotherCard(distributor, player)
+        }
+    }
+
+    private fun dealOutAdditionalCard(distributor: Distributor, dealer: Dealer) {
+        val receiveNewCard = dealer.getScore() < Dealer.LIMIT_SCORE
+        if (receiveNewCard) {
+            distributor.dealOutCard(dealer)
         }
+        DisplayView.dealOutAdditionalCard(receiveNewCard)
     }
 
-    private fun takeAnotherCard(dealer: Dealer, player: Player) {
-        if (player.getScore() >= MAX_SCORE) {
+    private fun takeAnotherCard(dealer: Distributor, player: Player) {
+        if (player.getScore() < MAX_SCORE) {
             dealOutAdditionalCard(dealer, player)
         }
     }

src/main/kotlin/blackjack/GameResult.kt

@@ -0,0 +1,6 @@
+package blackjack
+
+enum class GameResult(val description: String) {
+    WIN("승"),
+    LOSE("패")
+}

src/main/kotlin/blackjack/GameResultCalculator.kt

@@ -0,0 +1,18 @@
+package blackjack
+
+import blackjack.domain.Dealer
+import blackjack.domain.Players
+
+object GameResultCalculator {
+    // 딜러와 각 플레이어의 점수를 비교해서 승패를 판별하고 기록함
+    // 딜러가 21을 초과하면 그 시점까지 남아 있던 플레이어들은 가지고 있는 패에 상관 없이 승리한다
+    fun getResult(dealer: Dealer, players: Players) {
+        val scoreOfDealer = dealer.getScore()
+        val isDealerLose = scoreOfDealer > BlackJackGame.MAX_SCORE
+        players.players.forEach {
+            val scoreOfPlayer = it.getScore()
+            it.getGameResult(isDealerLose || scoreOfPlayer > scoreOfDealer)
+            dealer.getGameResult(!isDealerLose && scoreOfDealer > scoreOfPlayer)
+        }
+    }
+}

src/main/kotlin/blackjack/domain/Dealer.kt

@@ -1,39 +1,34 @@
 package blackjack.domain
 
+import blackjack.GameResult
 import blackjack.domain.card.Card
-import blackjack.domain.card.CardDeck
-import kotlin.random.Random
+import blackjack.domain.card.Cards
 
-class Dealer(
-    private val cardDeck: CardDeck
-) {
+class Dealer(name: String, cards: Cards = Cards()) : Player(name, cards) {
+    var isFinished = false
+    val gameResults = mutableListOf<GameResult>()
 
-    /**
-     * 플레이어들에게 2장씩 카드를 분배함
-     */
-    fun dealOutCards(players: Players) {
-        repeat(DEAL_OUT_CARD_AMOUNT){
-            players.players.forEach{ dealOutCard(it) }
+    constructor(cards: Cards = Cards()) : this(DEALER_DISPLAY_NAME, cards)
+
+    // 17점이 넘으면 호출되어도 더 이상 카드를 추가하지 않는다
+    override fun addCard(card: Card) {
+        if (isAddable()) {
+            super.addCard(card)
+        } else {
+            isFinished = true
         }
     }
 
-    /**
-     * 플레이어들에게 1장씩 카드를 분배함
-     */
-    fun dealOutCard(player: Player) {
-        player.cards.addCard(peekCard())
+    override fun getGameResult(win: Boolean) {
+        gameResults.add(if (win) GameResult.WIN else GameResult.LOSE)
     }
 
-    /**
-     * 카드덱에서 랜덤한 카드를 1장 꺼냄
-     */
-    private fun peekCard(): Card {
-        val random = Random.Default
-        val randomIndex = random.nextInt(cardDeck.cards.size)
-        return cardDeck.peekCard(randomIndex)
+    private fun isAddable(): Boolean {
+        return !isFinished && getScore() < LIMIT_SCORE
     }
 
     companion object {
-        const val DEAL_OUT_CARD_AMOUNT = 2
+        private const val DEALER_DISPLAY_NAME = "딜러"
+        const val LIMIT_SCORE = 17
     }
 }

src/main/kotlin/blackjack/domain/Distributor.kt

@@ -0,0 +1,40 @@
+package blackjack.domain
+
+import blackjack.domain.card.Card
+import blackjack.domain.card.CardDeck
+import kotlin.random.Random
+
+class Distributor(
+    private val cardDeck: CardDeck
+) {
+
+    /**
+     * 딜러와 플레이어들에게 2장씩 카드를 분배함
+     */
+    fun dealOutCards(dealer: Dealer, players: Players) {
+        repeat(DEAL_OUT_CARD_AMOUNT) {
+            dealOutCard(dealer)
+            players.players.forEach { dealOutCard(it) }
+        }
+    }
+
+    /**
+     * 플레이어들에게 1장씩 카드를 분배함
+     */
+    fun dealOutCard(player: Player) {
+        player.addCard(peekCard())
+    }
+
+    /**
+     * 카드덱에서 랜덤한 카드를 1장 꺼냄
+     */
+    private fun peekCard(): Card {
+        val random = Random.Default
+        val randomIndex = random.nextInt(cardDeck.cards.size)
+        return cardDeck.peekCard(randomIndex)
+    }
+
+    companion object {
+        const val DEAL_OUT_CARD_AMOUNT = 2
+    }
+}

src/main/kotlin/blackjack/domain/Player.kt

@@ -1,17 +1,28 @@
 package blackjack.domain
 
+import blackjack.GameResult
+import blackjack.domain.card.Card
 import blackjack.domain.card.Cards
 
-data class Player(
+open class Player(
     val name: String,
     val cards: Cards = Cards()
 ) {
+    lateinit var gameResult: GameResult
 
     override fun toString(): String {
         return name
     }
 
+    open fun addCard(card: Card) {
+        cards.addCard(card)
+    }
+
     fun getScore(): Int {
         return cards.getScore()
     }
+
+    open fun getGameResult(win: Boolean) {
+        gameResult = if (win) GameResult.WIN else GameResult.LOSE
+    }
 }

src/main/kotlin/blackjack/view/DisplayView.kt

@@ -1,21 +1,28 @@
 package blackjack.view
 
+import blackjack.GameResult
+import blackjack.domain.Dealer
 import blackjack.domain.Player
 import blackjack.domain.Players
 
 object DisplayView {
 
     fun dealOutCards(players: Players) {
         val playersName = players.players.joinToString()
-        println("${playersName}에게 2장의 카드 나누었습니다.")
+        println("딜러와 ${playersName}에게 2장의 카드 나누었습니다.")
     }
 
-    fun cardsOfPlayers(players: Players) {
+    fun cardsOfPlayers(dealer: Dealer, players: Players) {
+        cardsOfDealer(dealer)
         players.players.forEach {
             cardsOfPlayer(it)
         }
     }
 
+    fun cardsOfDealer(dealer: Dealer) {
+        println("${dealer.name}: ${dealer.cards}")
+    }
+
     fun cardsOfPlayer(player: Player) {
         println("${player.name}카드: ${player.cards}")
     }
@@ -24,10 +31,28 @@ object DisplayView {
         println("${player}는 한장의 카드를 더 받겠습니까?(예는 y, 아니오는 n)")
     }
 
-    fun result(players: Players) {
-        players.players.forEach {
-            println("${it.name}카드: ${it.cards} - 결과: ${it.getScore()}")
+    fun dealOutAdditionalCard(received: Boolean) {
+        if (received) {
+            println("딜러는 16이하라 한장의 카드를 더 받았습니다.")
+        } else {
+            println("딜러는 17이상이라 카드를 더 받지 않았습니다.")
         }
     }
 
+    fun finalScore(dealer: Dealer, players: Players) {
+        printFinalScore(dealer)
+        players.players.forEach { printFinalScore(it) }
+    }
+
+    fun result(dealer: Dealer, players: Players) {
+        println("\n## 최종 승패")
+        val dealerWinCnt = dealer.gameResults.count { it == GameResult.WIN }
+        val dealerLoseCnt = dealer.gameResults.count { it == GameResult.LOSE }
+        println("딜러: ${dealerWinCnt}승 ${dealerLoseCnt}패")
+        players.players.forEach { println("${it.name}: ${it.gameResult.description}") }
+    }
+
+    private fun printFinalScore(player: Player) {
+        println("${player.name}카드: ${player.cards} - 결과: ${player.getScore()}")
+    }
 }

src/test/kotlin/blackjack/domain/DealerTest.kt

@@ -0,0 +1,38 @@
+package blackjack.domain
+
+import blackjack.domain.card.Card
+import blackjack.domain.card.CardNumber
+import blackjack.domain.card.CardSymbol
+import blackjack.domain.card.Cards
+import io.kotest.core.spec.style.StringSpec
+import io.kotest.matchers.ints.shouldBeGreaterThan
+import io.kotest.matchers.shouldBe
+
+class DealerTest : StringSpec({
+    "17점이상의 카드를 가진 딜러는 카드를 받지 않는다" {
+        val cardsUnder17 = Cards(mutableListOf(Card(CardNumber.SIX, CardSymbol.DIAMOND), Card(CardNumber.JACK, CardSymbol.DIAMOND)))
+        val cardsScore17 = Cards(mutableListOf(Card(CardNumber.SEVEN, CardSymbol.HEART), Card(CardNumber.JACK, CardSymbol.HEART)))
+        val cardsOver17 = Cards(mutableListOf(Card(CardNumber.EIGHT, CardSymbol.SPADE), Card(CardNumber.JACK, CardSymbol.SPADE)))
+
+        val firstDealer = Dealer("cardsUnder17", cardsUnder17)
+        val scoreOfFirstDealer = firstDealer.getScore()
+
+        val secondDealer = Dealer("cardsScore17", cardsScore17)
+        val scoreOfSecondDealer = secondDealer.getScore()
+
+        val thirdDealer = Dealer("cardsOver17", cardsOver17)
+        val scoreOfThirdDealer = thirdDealer.getScore()
+
+        val additionalCard = Card(CardNumber.ACE, CardSymbol.CLOVER)
+
+        // when
+        firstDealer.addCard(additionalCard)
+        secondDealer.addCard(additionalCard)
+        thirdDealer.addCard(additionalCard)
+
+        // then
+        firstDealer.getScore() shouldBeGreaterThan scoreOfFirstDealer
+        secondDealer.getScore() shouldBe scoreOfSecondDealer
+        thirdDealer.getScore() shouldBe scoreOfThirdDealer
+    }
+})