ChatGPTボウリング実装チャレンジ、SRPヴァージョン

ボーリング.java

import java.util.ArrayList;
import java.util.List;

class Game {
    private List<Frame> frames;

    public Game() {
        frames = new ArrayList<>();
    }

    public void addFrame(Frame frame) {
        frames.add(frame);
    }

    public int calculateScore() {
        Scorer scorer = new Scorer();
        return scorer.calculateScore(frames);
    }
}

class Frame {
    private List<Integer> rolls;

    public Frame(int... pins) {
        rolls = new ArrayList<>();

        for (int pin : pins) {
            rolls.add(pin);
        }
    }

    public int getFirstRoll() {
        return rolls.get(0);
    }

    public int getScore() {
        int score = 0;

        for (int roll : rolls) {
            score += roll;
        }

        return score;
    }

    public boolean isStrike() {
        return rolls.size() == 1 && getFirstRoll() == 10;
    }

    public boolean isSpare() {
        return rolls.size() == 2 && getScore() == 10;
    }
}

class Scorer {
    public int calculateScore(List<Frame> frames) {
        int totalScore = 0;
        int frameIndex = 0;

        for (int frameNumber = 0; frameNumber < 10; frameNumber++) {
            Frame currentFrame = frames.get(frameIndex);

            if (currentFrame.isStrike()) {
                totalScore += 10 + getStrikeBonus(frameIndex, frames);
                frameIndex++;
            } else if (currentFrame.isSpare()) {
                totalScore += 10 + getSpareBonus(frameIndex, frames);
                frameIndex += 2;
            } else {
                totalScore += currentFrame.getScore();
                frameIndex += 2;
            }
        }

        return totalScore;
    }

    private int getStrikeBonus(int frameIndex, List<Frame> frames) {
        Frame nextFrame = frames.get(frameIndex + 1);
        int bonus = nextFrame.getScore();

        if (nextFrame.isStrike()) {
            Frame nextNextFrame = frames.get(frameIndex + 2);
            bonus += nextNextFrame.getFirstRoll();
        }

        return bonus;
    }

    private int getSpareBonus(int frameIndex, List<Frame> frames) {
        Frame nextFrame = frames.get(frameIndex + 1);
        return nextFrame.getFirstRoll();
    }
}