HintResult.java

package baseball.domain.models;

import baseball.domain.exceptions.InvalidHintResultException;

public class HintResult {
	private static final int MAX_COUNT = 3;
	private static final String NOTHING_MESSAGE = "낫싱";
	private static final String STRIKE_SUFFIX = "스트라이크";
	private static final String BALL_SUFFIX = "볼";

	private final int strikeCount;
	private final int ballCount;

	public HintResult(int strikeCount, int ballCount) {
		validateCount(strikeCount);
		validateCount(ballCount);
		validateTotal(strikeCount, ballCount);
		this.strikeCount = strikeCount;
		this.ballCount = ballCount;
	}

	public int strikeCount() {
		return strikeCount;
	}

	public int ballCount() {
		return ballCount;
	}

	public String message() {
		if (strikeCount == 0 && ballCount == 0) {
			return NOTHING_MESSAGE;
		}
		StringBuilder builder = new StringBuilder();
		appendCount(builder, strikeCount, STRIKE_SUFFIX);
		appendCount(builder, ballCount, BALL_SUFFIX);
		return builder.toString();
	}

	private void appendCount(StringBuilder builder, int count, String suffix) {
		if (count == 0) {
			return;
		}
		if (builder.length() > 0) {
			builder.append(" ");
		}
		builder.append(count).append(suffix);
	}

	private void validateCount(int count) {
		if (count < 0 || count > MAX_COUNT) {
			throw new InvalidHintResultException("카운트는 0에서 3 사이여야 해요.");
		}
	}

	private void validateTotal(int strikeCount, int ballCount) {
		if (strikeCount + ballCount > MAX_COUNT) {
			throw new InvalidHintResultException("스트라이크와 볼의 합은 3을 넘을 수 없어요.");
		}
	}
}