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

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

import java.util.List;
import java.util.Map;

/**
 * 住院医嘱校对业务实现
 *
 * 修复 Bug #505：
 *   - 增加前置状态校验，拦截已执行或已发药的药品医嘱直接退回。
 *   - 在退回成功后，确保对应的发药汇总单状态回滚为 “未完成”，防止状态不一致。
 *
 * 同时配合 {@link DispenseMapper#updateDispenseSummaryStatus} 解决 Bug #503。
 */
@Service
public class OrderVerifyServiceImpl {

    private final OrderMapper orderMapper;
    private final DispenseMapper dispenseMapper;

    public OrderVerifyServiceImpl(OrderMapper orderMapper,
                                  DispenseMapper dispenseMapper) {
        this.orderMapper = orderMapper;
        this.dispenseMapper = dispenseMapper;
    }

    /**
     * 批量退回已校对医嘱
     *
     * @param orderIds 医嘱ID列表
     */
    @Transactional(rollbackFor = Exception.class)
    public void returnOrders(List<Long> orderIds) {
        if (orderIds == null || orderIds.isEmpty()) {
            throw new IllegalArgumentException("退回医嘱列表不能为空");
        }

        for (Long orderId : orderIds) {
            Map<String, Object> order = orderMapper.selectOrderById(orderId);
            if (order == null) {
                throw new IllegalArgumentException("医嘱不存在，ID=" + orderId);
            }

            String execStatus = String.valueOf(order.get("exec_status"));
            String dispenseStatus = String.valueOf(order.get("dispense_status"));

            // 核心状态约束校验：执行状态或物理发药状态已流转，严禁直接退回
            if ("EXECUTED".equals(execStatus) || "DISPENSED".equals(dispenseStatus)) {
                throw new RuntimeException("该药品已由药房发放，请先执行退药处理，不可直接退回");
            }

            // 执行退回操作：更新医嘱状态为已退回
            orderMapper.updateOrderStatus(orderId, "RETURNED");

            // 若该医嘱已生成发药汇总单（状态可能为未完成），需要将其状态恢复为未完成，以保持一致性
            dispenseMapper.updateDispenseSummaryStatus(orderId, "PENDING");
        }
    }
}