package com.video.handler;

import com.baomidou.mybatisplus.core.handlers.MetaObjectHandler;
import lombok.extern.slf4j.Slf4j;
import org.apache.ibatis.reflection.MetaObject;
import org.springframework.stereotype.Component;
import org.springframework.web.context.request.RequestAttributes;
import org.springframework.web.context.request.RequestContextHolder;
import org.springframework.web.context.request.ServletRequestAttributes;

import javax.servlet.http.HttpServletRequest;
import java.util.Date;

@Slf4j
@Component // 一定不要忘记把处理器加到IOC容器中！
public class MyMetaObjectHandler implements MetaObjectHandler {
    // 插入时的填充策略
    @Override
    public void insertFill(MetaObject metaObject) {
        HttpServletRequest request = getHttpServletRequest();
        Long user_id = 1L;//request.getHeader("user_id") == null ? "测试" : request.getHeader("user_id");
        log.info("start insert fill.....");
        // setFieldValByName(String fieldName, Object fieldVal, MetaObject metaObject
        this.setFieldValByName("createTime",new Date(),metaObject);
        this.setFieldValByName("updateTime",new Date(),metaObject);
        this.setFieldValByName("createUser",user_id,metaObject);
        this.setFieldValByName("updateUser",user_id,metaObject);
    }

    // 更新时的填充策略
    @Override
    public void updateFill(MetaObject metaObject) {
        HttpServletRequest request = getHttpServletRequest();
        Long user_id = 1L;
        log.info("start update fill.....");
        this.setFieldValByName("updateTime",new Date(),metaObject);
        this.setFieldValByName("updateUser",user_id,metaObject);
    }

    private HttpServletRequest getHttpServletRequest() {
        RequestAttributes requestAttributes = RequestContextHolder.getRequestAttributes();
        ServletRequestAttributes attributes = (ServletRequestAttributes) requestAttributes;
        return attributes.getRequest();
    }
}