package com.tourguide.modules.finance.service;

import com.tourguide.common.exception.BusinessException;
import com.tourguide.modules.user.mapper.GuideUserMapper;
import com.tourguide.modules.user.mapper.GuideTeamMapper;
import com.tourguide.modules.user.entity.GuideTeam;
import org.springframework.stereotype.Service;

import java.math.BigDecimal;
import java.math.RoundingMode;

/** 统一读取和原子变更导游可提现余额。 */
@Service
public class GuideWithdrawableBalanceService {
    private final GuideUserMapper guideUserMapper;
    private final GuideTeamMapper guideTeamMapper;

    public GuideWithdrawableBalanceService(GuideUserMapper guideUserMapper, GuideTeamMapper guideTeamMapper) {
        this.guideUserMapper = guideUserMapper;
        this.guideTeamMapper = guideTeamMapper;
    }

    public BigDecimal getAvailableAmount(Long guideId) {
        return money(guideUserMapper.selectBalance(guideId));
    }

    public boolean debit(Long guideId, BigDecimal amount) {
        BigDecimal value = money(amount);
        return value.signum() > 0 && guideUserMapper.decreaseBalance(guideId, value) == 1;
    }

    /** 退款冲正只扣除当前余额，余额不足时保留为零，避免退款回调因余额竞争失败。 */
    public boolean debitForRefund(Long guideId, BigDecimal amount) {
        BigDecimal value = money(amount);
        return value.signum() > 0 && guideUserMapper.decreaseBalanceForRefund(guideId, value) == 1;
    }

    public void credit(Long guideId, BigDecimal amount) {
        BigDecimal value = money(amount);
        if (value.signum() == 0) return;
        if (value.signum() < 0 || guideUserMapper.increaseBalance(guideId, value) != 1) {
            throw new BusinessException(500, "导游余额更新失败");
        }
    }

    public BigDecimal getAvailableTeamAmount(Long teamId) {
        if (teamId == null) return BigDecimal.ZERO.setScale(2);
        GuideTeam team = guideTeamMapper.selectById(teamId);
        return money(team == null ? null : team.getBalance());
    }

    public boolean debitTeam(Long teamId, BigDecimal amount) {
        BigDecimal value = money(amount);
        return teamId != null && value.signum() > 0
                && guideTeamMapper.decreaseBalance(teamId, value) == 1;
    }

    public boolean debitTeamForRefund(Long teamId, BigDecimal amount) {
        BigDecimal value = money(amount);
        return teamId != null && value.signum() > 0
                && guideTeamMapper.decreaseBalanceForRefund(teamId, value) == 1;
    }

    public void creditTeam(Long teamId, BigDecimal amount) {
        BigDecimal value = money(amount);
        if (value.signum() == 0) return;
        if (teamId == null || value.signum() < 0
                || guideTeamMapper.increaseBalance(teamId, value) != 1) {
            throw new BusinessException(500, "讲解队余额更新失败");
        }
    }

    private BigDecimal money(BigDecimal value) {
        return (value == null ? BigDecimal.ZERO : value).setScale(2, RoundingMode.HALF_UP);
    }
}