/*
Copyright [2020] [https://www.xiaonuo.vip]

Licensed under the Apache License, Version 2.0 (the "License");
you may not use this file except in compliance with the License.
You may obtain a copy of the License at

  http://www.apache.org/licenses/LICENSE-2.0

Unless required by applicable law or agreed to in writing, software
distributed under the License is distributed on an "AS IS" BASIS,
WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
See the License for the specific language governing permissions and
limitations under the License.

Snowy采用APACHE LICENSE 2.0开源协议，您在使用过程中，需要注意以下几点：

1.请不要删除和修改根目录下的LICENSE文件。
2.请不要删除和修改Snowy源码头部的版权声明。
3.请保留源码和相关描述文件的项目出处，作者声明等。
4.分发源码时候，请注明软件出处 https://gitee.com/xiaonuobase/snowy
5.在修改包名，模块名称，项目代码等时，请注明软件出处 https://gitee.com/xiaonuobase/snowy
6.若您的项目无法满足以上几点，可申请商业授权，获取Snowy商业授权许可，请在官网购买授权，地址为 https://www.xiaonuo.vip
 */
package vip.xiaonuo.sys.core.mybatis.fieldfill;

import cn.hutool.core.util.ObjectUtil;
import cn.hutool.log.Log;
import com.baomidou.mybatisplus.core.handlers.MetaObjectHandler;
import org.apache.ibatis.reflection.MetaObject;
import org.apache.ibatis.reflection.ReflectionException;
import vip.xiaonuo.core.context.login.LoginContextHolder;
import vip.xiaonuo.core.pojo.login.SysLoginUser;

import java.util.Date;

/**
 * 自定义sql字段填充器，自动填充创建修改相关字段
 *
 * @author xuyuxiang
 * @date 2020/3/30 15:21
 */
public class CustomMetaObjectHandler implements MetaObjectHandler {

    private static final Log log = Log.get();

    private static final String CREATE_USER = "createUser";

    private static final String CREATE_TIME = "createTime";

    private static final String UPDATE_USER = "updateUser";

    private static final String UPDATE_TIME = "updateTime";

    @Override
    public void insertFill(MetaObject metaObject) {
        try {
            //为空则设置createUser（BaseEntity)
            Object createUser = metaObject.getValue(CREATE_USER);
            if(ObjectUtil.isNull(createUser)) {
                setFieldValByName(CREATE_USER, this.getUserUniqueId(), metaObject);
            }

            //为空则设置createTime（BaseEntity)
            Object createTime = metaObject.getValue(CREATE_TIME);
            if(ObjectUtil.isNull(createTime)) {
                setFieldValByName(CREATE_TIME, new Date(), metaObject);
            }
        } catch (ReflectionException e) {
            log.warn(">>> CustomMetaObjectHandler处理过程中无相关字段，不做处理");
        }
    }

    @Override
    public void updateFill(MetaObject metaObject) {
        try {
            //设置updateUser（BaseEntity)
            setFieldValByName(UPDATE_USER, this.getUserUniqueId(), metaObject);
            //设置updateTime（BaseEntity)
            setFieldValByName(UPDATE_TIME, new Date(), metaObject);
        } catch (ReflectionException e) {
            log.warn(">>> CustomMetaObjectHandler处理过程中无相关字段，不做处理");
        }
    }

    /**
     * 获取用户唯一id
     */
    private Long getUserUniqueId() {
        try {
            SysLoginUser sysLoginUser = LoginContextHolder.me().getSysLoginUserWithoutException();
            if(ObjectUtil.isNotNull(sysLoginUser)) {
                return sysLoginUser.getId();
            } else {
                return -1L;
            }
        } catch (Exception e) {
            //如果获取不到就返回-1
            return -1L;
        }
    }
}