package com.mes.config;

import com.baomidou.mybatisplus.core.handlers.MetaObjectHandler;
import org.apache.ibatis.reflection.MetaObject;
import org.springframework.stereotype.Component;

import java.time.LocalDateTime;

/**
 * 统一处理公共字段（created_time、updated_time、created_by、updated_by）的自动填充
 */
@Component
public class MybatisMetaObjectHandler implements MetaObjectHandler {

    @Override
    public void insertFill(MetaObject metaObject) {
        LocalDateTime now = LocalDateTime.now();
        String operator = resolveOperator();

        strictInsertFill(metaObject, "createdTime", LocalDateTime.class, now);
        strictInsertFill(metaObject, "updatedTime", LocalDateTime.class, now);
        strictInsertFill(metaObject, "createdBy", String.class, operator);
        strictInsertFill(metaObject, "updatedBy", String.class, operator);
    }

    @Override
    public void updateFill(MetaObject metaObject) {
        strictUpdateFill(metaObject, "updatedTime", LocalDateTime.class, LocalDateTime.now());
        strictUpdateFill(metaObject, "updatedBy", String.class, resolveOperator());
    }

    private String resolveOperator() {
        // 注意：这里可以接入Spring Security或其他认证框架获取当前登录用户
        // 例如：SecurityContextHolder.getContext().getAuthentication().getName()
        // 当前暂时使用system作为默认值
        try {
            // 可以尝试从请求上下文获取用户信息
            // 这里暂时返回system，后续可以扩展
            return "system";
        } catch (Exception e) {
            return "system";
        }
    }
}