xzmaster/backend/src/main/java/com/xuezhanmaster/game/service/SettlementService.java

package com.xuezhanmaster.game.service;

import com.xuezhanmaster.game.domain.ActionType;
import com.xuezhanmaster.game.domain.GameSeat;
import com.xuezhanmaster.game.domain.GameTable;
import com.xuezhanmaster.game.domain.ScoreChange;
import com.xuezhanmaster.game.domain.SettlementResult;
import com.xuezhanmaster.game.domain.SettlementType;
import org.springframework.stereotype.Service;

import java.util.ArrayList;
import java.util.LinkedHashMap;
import java.util.List;
import java.util.Map;

@Service
public class SettlementService {

    private static final int DIAN_PAO_HU_SCORE = 1;
    private static final int ZI_MO_HU_SCORE = 1;
    private static final int MING_GANG_SCORE = 1;

    public SettlementResult settleDiscardHu(
            GameTable table,
            int winnerSeatNo,
            int sourceSeatNo,
            String triggerTile
    ) {
        return applySettlement(
                table,
                SettlementType.DIAN_PAO_HU,
                ActionType.HU,
                winnerSeatNo,
                sourceSeatNo,
                triggerTile,
                orderedDeltas(winnerSeatNo, DIAN_PAO_HU_SCORE, sourceSeatNo, -DIAN_PAO_HU_SCORE)
        );
    }

    public SettlementResult settleExposedGang(
            GameTable table,
            int winnerSeatNo,
            int sourceSeatNo,
            String triggerTile
    ) {
        return applySettlement(
                table,
                SettlementType.MING_GANG,
                ActionType.GANG,
                winnerSeatNo,
                sourceSeatNo,
                triggerTile,
                orderedDeltas(winnerSeatNo, MING_GANG_SCORE, sourceSeatNo, -MING_GANG_SCORE)
        );
    }

    public SettlementResult settleSelfDrawHu(
            GameTable table,
            int winnerSeatNo,
            String triggerTile
    ) {
        Map<Integer, Integer> scoreDeltas = new LinkedHashMap<>();
        int totalWinScore = 0;
        for (GameSeat seat : table.getSeats()) {
            if (seat.getSeatNo() == winnerSeatNo || seat.isWon()) {
                continue;
            }
            scoreDeltas.put(seat.getSeatNo(), -ZI_MO_HU_SCORE);
            totalWinScore += ZI_MO_HU_SCORE;
        }
        scoreDeltas.put(winnerSeatNo, totalWinScore);
        return applySettlement(
                table,
                SettlementType.ZI_MO_HU,
                ActionType.HU,
                winnerSeatNo,
                winnerSeatNo,
                triggerTile,
                scoreDeltas
        );
    }

    private SettlementResult applySettlement(
            GameTable table,
            SettlementType settlementType,
            ActionType actionType,
            int actorSeatNo,
            int sourceSeatNo,
            String triggerTile,
            Map<Integer, Integer> scoreDeltas
    ) {
        List<ScoreChange> scoreChanges = new ArrayList<>();
        for (Map.Entry<Integer, Integer> entry : scoreDeltas.entrySet()) {
            GameSeat seat = table.getSeats().get(entry.getKey());
            seat.addScore(entry.getValue());
            scoreChanges.add(new ScoreChange(
                    seat.getSeatNo(),
                    entry.getValue(),
                    seat.getScore()
            ));
        }
        return new SettlementResult(
                settlementType,
                actionType,
                actorSeatNo,
                sourceSeatNo,
                triggerTile,
                List.copyOf(scoreChanges)
        );
    }

    private Map<Integer, Integer> orderedDeltas(int winnerSeatNo, int winnerDelta, int sourceSeatNo, int sourceDelta) {
        Map<Integer, Integer> deltas = new LinkedHashMap<>();
        deltas.put(winnerSeatNo, winnerDelta);
        deltas.put(sourceSeatNo, sourceDelta);
        return deltas;
    }
}