[박성우] 야구 게임 미션

src/main/java/baseball/Application.java

@@ -1,7 +1,58 @@
 package baseball;
 
+import baseball.domain.GameResult;
+import baseball.service.GameService;
+import camp.nextstep.edu.missionutils.Console;
+
 public class Application {
+
     public static void main(String[] args) {
-        // TODO: 프로그램 구현
+        while (true) {
+            playGame();
+
+            System.out.println("게임을 새로 시작하려면 1, 종료하려면 2를 입력하세요.");
+            if (Console.readLine().equals("2")) {
+                System.out.println("게임 종료");
+                break;
+            }
+        }
+    }
+
+    private static void playGame() {
+        GameService gameService = new GameService();
+
+        System.out.println("숫자 야구 게임을 시작합니다.");
+        while (true) {
+            System.out.print("숫자를 입력해주세요 : ");
+            String playerInput = Console.readLine();
+            GameResult result = gameService.findResult(playerInput);
+            String answer = getResultComment(result);
+            System.out.println(answer);
+            if (result.equals(GameResult.THREE_STRIKE)) {
+                break;
+            }
+        }
+    }
+
+    private static String getResultComment(GameResult result) {
+        final int strike = result.getStrike();
+        final int ball = result.getBall();
+
+        if (strike == 0 && ball == 0) {
+            return "낫싱";
+        }
+
+        StringBuilder answer = new StringBuilder();
+        if (ball != 0) {
+            answer.append(ball);
+            answer.append("볼 ");
+        }
+
+        if (strike != 0) {
+            answer.append(result.getStrike());
+            answer.append("스트라이크");
+        }
+
+        return answer.toString();
     }
 }

src/main/java/baseball/domain/GameNumber.java

@@ -0,0 +1,45 @@
+package baseball.domain;
+
+import camp.nextstep.edu.missionutils.Randoms;
+import java.util.Objects;
+
+public class GameNumber {
+
+    private static final int MIN_VALUE = 1;
+    private static final int MAX_VALUE = 9;
+
+    private final int value;
+
+    public GameNumber(int value) {
+        validateRange(value);
+        this.value = value;
+    }
+
+    private void validateRange(int value) {
+        if (value < MIN_VALUE || value > MAX_VALUE) {
+            throw new IllegalArgumentException(String.format("[ERROR] 야구게임 숫자는 %d일 수 없습니다", value));
+        }
+    }
+
+    public static GameNumber createRandomNumber() {
+        final int number = Randoms.pickNumberInRange(MIN_VALUE, MAX_VALUE);
+        return new GameNumber(number);
+    }
+
+    @Override
+    public boolean equals(Object o) {
+        if (this == o) {
+            return true;
+        }
+        if (o == null || getClass() != o.getClass()) {
+            return false;
+        }
+        GameNumber that = (GameNumber) o;
+        return value == that.value;
+    }
+
+    @Override
+    public int hashCode() {
+        return Objects.hash(value);
+    }
+}

src/main/java/baseball/domain/GameNumbers.java

@@ -0,0 +1,64 @@
+package baseball.domain;
+
+import baseball.domain.gamenumbercreator.GameNumberCreator;
+import java.util.HashSet;
+import java.util.List;
+import java.util.Objects;
+import java.util.stream.IntStream;
+
+public class GameNumbers {
+
+    private static final int MAX_LENGTH = 3;
+    private final List<GameNumber> numbers;
+
+    private GameNumbers(List<GameNumber> numbers) {
+        validateLength(numbers);
+        validateDuplicate(numbers);
+        this.numbers = numbers;
+    }
+
+    public static GameNumbers from(GameNumberCreator numberCreator) {
+        return new GameNumbers(numberCreator.create(MAX_LENGTH));
+    }
+
+    private void validateLength(List<GameNumber> numbers) {
+        if (numbers.size() != MAX_LENGTH) {
+            throw new IllegalArgumentException(String.format("[ERROR] 게임 숫자는 %d 자리여야합니다.", MAX_LENGTH));
+        }
+    }
+
+    private void validateDuplicate(List<GameNumber> numbers) {
+        if (numbers.size() != new HashSet<>(numbers).size()) {
+            throw new IllegalArgumentException("[ERROR] 게임 숫자는 중복된 값을 가질 수 없습니다.");
+        }
+    }
+
+    public GameResult calculateResult(GameNumbers other) {
+        int strike = (int) IntStream.range(0, other.numbers.size())
+                .filter(i -> other.numbers.get(i).equals(this.numbers.get(i)))
+                .count();
+
+        int ball = (int) other.numbers.stream()
+                .filter(this.numbers::contains)
+                .count() - strike;
+
+        return GameResult.find(strike, ball);
+    }
+
+    @Override
+    public boolean equals(Object o) {
+        if (this == o) {
+            return true;
+        }
+        if (o == null || getClass() != o.getClass()) {
+            return false;
+        }
+        GameNumbers that = (GameNumbers) o;
+        return Objects.equals(numbers, that.numbers);
+    }
+
+    @Override
+    public int hashCode() {
+        return Objects.hash(numbers);
+    }
+}

src/main/java/baseball/domain/GameResult.java

@@ -0,0 +1,40 @@
+package baseball.domain;
+
+import java.util.Arrays;
+
+public enum GameResult {
+    ZERO(0, 0),
+    ZERO_STRIKE_ONE_BALL(0, 1),
+    ZERO_STRIKE_TWO_BALL(0, 2),
+    ZERO_STRIKE_THREE_BALL(0, 3),
+    ONE_STRIKE_ZERO_BALL(1, 0),
+    ONE_STRIKE_ONE_BALL(1, 1),
+    ONE_STRIKE_TWO_BALL(1, 2),
+    TWO_STRIKE_ZERO_BALL(2, 0),
+    TWO_STRIKE_ONE_BALL(2, 1),
+    THREE_STRIKE(3, 0);
+
+    private final int strike;
+    private final int ball;
+
+    GameResult(int strike, int ball) {
+        this.strike = strike;
+        this.ball = ball;
+    }
+
+    public static GameResult find(int strike, int ball) {
+        return Arrays.stream(GameResult.values())
+                .filter(gameResult -> gameResult.strike == strike && gameResult.ball == ball)
+                .findAny()
+                .orElseThrow(() -> new IllegalArgumentException(
+                        String.format("[ERROR] %d 스트라이크 %d 볼에 해달하는 결과는 존재하지 않습니다.", strike, ball)));
+    }
+
+    public int getStrike() {
+        return strike;
+    }
+
+    public int getBall() {
+        return ball;
+    }
+}

src/main/java/baseball/domain/gamenumbercreator/GameNumberCreator.java

@@ -0,0 +1,8 @@
+package baseball.domain.gamenumbercreator;
+
+import baseball.domain.GameNumber;
+import java.util.List;
+
+public interface GameNumberCreator {
+    List<GameNumber> create(int maxLength);
+}

src/main/java/baseball/domain/gamenumbercreator/RandomIntegerToGameNumberCreator.java

@@ -0,0 +1,17 @@
+package baseball.domain.gamenumbercreator;
+
+import baseball.domain.GameNumber;
+import java.util.List;
+import java.util.stream.Collectors;
+import java.util.stream.Stream;
+
+public class RandomIntegerToGameNumberCreator implements GameNumberCreator {
+
+    @Override
+    public List<GameNumber> create(int maxLength) {
+        return Stream.generate(GameNumber::createRandomNumber)
+                .distinct()
+                .limit(maxLength)
+                .collect(Collectors.toList());
+    }
+}

src/main/java/baseball/domain/gamenumbercreator/StringToGameNumberCreator.java

@@ -0,0 +1,35 @@
+package baseball.domain.gamenumbercreator;
+
+import baseball.domain.GameNumber;
+import java.util.Arrays;
+import java.util.List;
+import java.util.stream.Collectors;
+
+public class StringToGameNumberCreator implements GameNumberCreator {
+
+    private final String values;
+
+    public StringToGameNumberCreator(String values) {
+        this.values = values;
+    }
+
+    @Override
+    public List<GameNumber> create(int maxLength) {
+        if (values.length() != maxLength) {
+            throw new IllegalArgumentException(String.format("[ERROR] %s는 %d 자리수가 아닙니다.", values, maxLength));
+        }
+
+        return Arrays.stream(values.split(""))
+                .map(this::parseInt)
+                .map(GameNumber::new)
+                .collect(Collectors.toList());
+    }
+
+    private Integer parseInt(String value) {
+        try {
+            return Integer.parseInt(value);
+        } catch (NumberFormatException e) {
+            throw new IllegalArgumentException(String.format("[ERROR] 입력값 %s는 숫자가 아닙니다.", value));
+        }
+    }
+}

src/main/java/baseball/service/GameService.java

@@ -0,0 +1,21 @@
+package baseball.service;
+
+import baseball.domain.GameNumbers;
+import baseball.domain.GameResult;
+import baseball.domain.gamenumbercreator.RandomIntegerToGameNumberCreator;
+import baseball.domain.gamenumbercreator.StringToGameNumberCreator;
+
+public class GameService {
+
+    private final GameNumbers answerNumbers;
+
+    public GameService() {
+        this.answerNumbers = GameNumbers.from(new RandomIntegerToGameNumberCreator());
+    }
+
+    public GameResult findResult(String playerRequest) {
+        final StringToGameNumberCreator creator = new StringToGameNumberCreator(playerRequest);
+        final GameNumbers playerNumbers = GameNumbers.from(creator);
+        return answerNumbers.calculateResult(playerNumbers);
+    }
+}

src/test/java/baseball/ApplicationTest.java

@@ -1,13 +1,13 @@
 package baseball;
 
-import camp.nextstep.edu.missionutils.test.NsTest;
-import org.junit.jupiter.api.Test;
-
 import static camp.nextstep.edu.missionutils.test.Assertions.assertRandomNumberInRangeTest;
 import static camp.nextstep.edu.missionutils.test.Assertions.assertSimpleTest;
 import static org.assertj.core.api.Assertions.assertThat;
 import static org.assertj.core.api.Assertions.assertThatThrownBy;
 
+import camp.nextstep.edu.missionutils.test.NsTest;
+import org.junit.jupiter.api.Test;
+
 class ApplicationTest extends NsTest {
     @Test
     void 게임종료_후_재시작() {

src/test/java/baseball/domain/GameNumberTest.java

@@ -0,0 +1,23 @@
+package baseball.domain;
+
+import org.assertj.core.api.Assertions;
+import org.junit.jupiter.api.Test;
+import org.junit.jupiter.params.ParameterizedTest;
+import org.junit.jupiter.params.provider.ValueSource;
+
+class GameNumberTest {
+
+    @ParameterizedTest
+    @ValueSource(ints = {0, 10})
+    void 게임_숫자가_1이상_9이하의_자연수가_아니면_예외를_던진다(int number) {
+        Assertions.assertThatThrownBy(() -> new GameNumber(number))
+                .isInstanceOf(IllegalArgumentException.class);
+    }
+
+    @ParameterizedTest
+    @ValueSource(ints = {1, 2, 3, 4, 5, 6, 7, 8, 9})
+    void 게임_숫자는_1이상_9이하의_자연수여야한다(int number) {
+        Assertions.assertThatCode(() -> new GameNumber(number))
+                .doesNotThrowAnyException();
+    }
+}