package com.openhis.web.inpatient.mapper;

import org.apache.ibatis.annotations.*;

import java.util.Map;

/**
 * 发药汇总单 Mapper
 *
 * 新增：
 *   1. {@code recalculateSummaryByPrescriptionId}：基于明细表重新计算汇总信息，并使用 FOR UPDATE 锁定行。
 *   2. {@code insertInitialSummary}：在首次发药时插入空的汇总记录，防止后续更新失败。
 */
@Mapper
public interface DispensingSummaryMapper {

    /**
     * 重新计算指定处方的发药汇总信息。
     *
     * 该 SQL 会：
     *   - 对 his_dispensing_detail 按 prescription_id 汇总数量、金额等。
     *   - 使用 SELECT ... FOR UPDATE 锁定对应的 his_dispensing_summary 行，确保并发安全。
     *   - 更新汇总表的 total_quantity、total_amount、status 等字段。
     *
     * @param prescriptionId 处方主键
     * @return 更新的记录数（通常为 1）
     */
    @Update({
        "<script>",
        "UPDATE his_dispensing_summary s",
        "SET",
        "  s.total_quantity = (SELECT IFNULL(SUM(d.quantity),0) FROM his_dispensing_detail d WHERE d.prescription_id = #{prescriptionId}),",
        "  s.total_amount   = (SELECT IFNULL(SUM(d.amount),0)   FROM his_dispensing_detail d WHERE d.prescription_id = #{prescriptionId}),",
        "  s.status = CASE",
        "               WHEN EXISTS (SELECT 1 FROM his_dispensing_detail d WHERE d.prescription_id = #{prescriptionId} AND d.type = 'RETURN')",
        "                 THEN 'PARTIAL_RETURN'",
        "               ELSE 'DISPENSED'",
        "             END",
        "WHERE s.prescription_id = #{prescriptionId}",
        // 加锁，防止并发更新导致汇总不一致
        "AND EXISTS (SELECT 1 FROM his_dispensing_summary s2 WHERE s2.id = s.id FOR UPDATE)",
        "</script>"
    })
    int recalculateSummaryByPrescriptionId(@Param("prescriptionId") Long prescriptionId);

    /**
     * 首次发药时插入一条空的汇总记录。
     *
     * @param prescriptionId 处方主键
     */
    @Insert("INSERT INTO his_dispensing_summary (prescription_id, total_quantity, total_amount, status) " +
            "VALUES (#{prescriptionId}, 0, 0, 'INIT')")
    void insertInitialSummary(@Param("prescriptionId") Long prescriptionId);
}