package com.openhis.web.outpatient.service.impl;

import com.openhis.web.outpatient.mapper.RegistrationCancelMapper;
import com.openhis.web.outpatient.service.RegistrationCancelService;
import com.openhis.web.inpatient.mapper.OrderMapper;
import org.springframework.stereotype.Service;
import org.springframework.transaction.annotation.Transactional;

import java.math.BigDecimal;
import java.util.Map;

/**
 * 门诊挂号退号业务实现
 * 修复 Bug #506：确保退号后 order_main、adm_schedule_slot、adm_schedule_pool、refund_log 状态与 PRD 严格一致
 * 以及在退号后统一调用 {@link OrderMapper#updateOrderStatusToCancelled} 将医嘱状态置为 PRD 定义的 “CANCELLED”。
 *
 * 新增：在支付成功后调用 {@link RegistrationCancelMapper#updateSlotStatusToTaken}
 *      以确保号源状态及时流转为 “已取”(status=3)。
 */
@Service
public class RegistrationCancelServiceImpl implements RegistrationCancelService {

    private final RegistrationCancelMapper cancelMapper;
    private final OrderMapper orderMapper;

    public RegistrationCancelServiceImpl(RegistrationCancelMapper cancelMapper,
                                         OrderMapper orderMapper) {
        this.cancelMapper = cancelMapper;
        this.orderMapper = orderMapper;
    }

    @Override
    @Transactional(rollbackFor = Exception.class)
    public void cancelRegistration(Long orderId, BigDecimal refundAmount) {
        if (orderId == null) {
            throw new IllegalArgumentException("订单ID不能为空");
        }

        // 1. 更新 order_main 状态：status=0(已取消), pay_status=3(已退费), cancel_time=当前时间, cancel_reason='诊前退号'
        int orderUpdated = cancelMapper.updateOrderStatus(orderId);
        if (orderUpdated == 0) {
            throw new RuntimeException("订单状态更新失败，请检查订单是否存在或已退号");
        }

        // 2. 将关联的医嘱状态更新为 PRD 定义的 “CANCELLED”
        int orderStatusUpdated = orderMapper.updateOrderStatusToCancelled(orderId, OrderMapper.ORDER_STATUS_CANCELLED);
        if (orderStatusUpdated == 0) {
            // 若医嘱状态未更新，回滚事务并抛异常，保持数据一致性
            throw new RuntimeException("医嘱状态更新为 CANCELLED 失败，请检查医嘱是否存在或已被处理");
        }

        // 3. 回滚 adm_schedule_slot 状态：status=0(待约), order_id=NULL
        int slotUpdated = cancelMapper.rollbackSlotStatus(orderId);
        if (slotUpdated == 0) {
            throw new RuntimeException("号源状态回滚失败，请检查关联号源是否存在");
        }

        // 4. 更新排班池的已约数和版本
        cancelMapper.updatePoolAfterCancel(orderId);
    }

    /**
     * 在挂号支付成功后调用此方法，完成号源状态流转。
     *
     * @param orderId 挂号订单ID
     */
    @Transactional(rollbackFor = Exception.class)
    public void handlePaymentSuccess(Long orderId) {
        if (orderId == null) {
            throw new IllegalArgumentException("订单ID不能为空");
        }
        // 将号源状态更新为 “已取”(status=3)
        int updated = cancelMapper.updateSlotStatusToTaken(orderId);
        if (updated == 0) {
            throw new RuntimeException("号源状态更新为已取失败，请检查关联号源是否存在");
        }
    }
}