package com.example.caseData.dao;

import com.baomidou.mybatisplus.core.mapper.BaseMapper;
import com.baomidou.mybatisplus.core.metadata.IPage;
import com.baomidou.mybatisplus.extension.plugins.pagination.Page;
import com.example.caseData.dto.caseExchange.CaseExchangeDto;
import com.example.caseData.model.CaseExchangeModel;
import com.example.caseData.model.StatsCaseExchangeUserModel;
import org.apache.ibatis.annotations.Mapper;
import org.apache.ibatis.annotations.Param;
import org.apache.ibatis.annotations.Update;

import java.util.Map;

@Mapper
public interface StatsCaseExchangeUserDao extends BaseMapper<StatsCaseExchangeUserModel> {
    /**
     * Inc 自增
     * @param userId 文章 ID
     * @param field     字段名称
     * @param numeral   增加的数值
     * @return 更新的行数
     */
    @Update("UPDATE stats_case_exchange_user SET ${field} = ${field} + #{numeral} WHERE user_id = #{userId}")
    int inc(@Param("userId") Long userId, @Param("field") String field, @Param("numeral") int numeral);

    /**
     * Dec 自减
     *
     * @param userId 文章 ID
     * @param field     字段名称
     * @param numeral   减少的数值
     * @return 更新的行数
     */
    @Update("UPDATE stats_case_exchange_user " +
            "SET ${field} = CASE WHEN ${field} >= #{numeral} THEN ${field} - #{numeral} ELSE 0 END " +
            "WHERE user_id = #{userId}")
    int dec(@Param("userId") Long userId, @Param("field") String field, @Param("numeral") int numeral);
}