package com.ruoyi.common.handler;

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

import java.time.LocalDateTime;

@Component
public class MyMetaObjectHandler implements MetaObjectHandler {

    private static final String SYSTEM_USER = "system";

    @Override
    public void insertFill(MetaObject meta) {
        LocalDateTime now = LocalDateTime.now();
        String userId = getUserId();

        if (hasField(meta, "createBy")) {
            strictInsertFill(meta, "createBy", String.class, userId);
        }
        if (hasField(meta, "updateBy")) {
            strictInsertFill(meta, "updateBy", String.class, userId);
        }
        if (hasField(meta, "createTime")) {
            strictInsertFill(meta, "createTime", LocalDateTime.class, now);
        }
        if (hasField(meta, "updateTime")) {
            strictInsertFill(meta, "updateTime", LocalDateTime.class, now);
        }
    }

    @Override
    public void updateFill(MetaObject meta) {
        LocalDateTime now = LocalDateTime.now();
        String userId = getUserId();

        if (hasField(meta, "updateBy")) {
            strictUpdateFill(meta, "updateBy", String.class, userId);
        }
        if (hasField(meta, "updateTime")) {
            setFieldValByName("updateTime", now, meta);
        }
    }

    private String getUserId() {
        try {
            Long uid = SecurityUtils.getLoginUser().getUserId();
            return uid != null ? uid.toString() : SYSTEM_USER;
        } catch (Exception e) {
            return SYSTEM_USER;
        }
    }

    private boolean hasField(MetaObject meta, String fieldName) {
        if (meta == null || fieldName == null) {
            return false;
        }
        return meta.hasGetter(fieldName) || meta.hasSetter(fieldName);
    }
}