package com.tcm.training.admin.config;

import com.baomidou.mybatisplus.core.handlers.MetaObjectHandler;
import com.tcm.training.admin.user.entity.SysUser;
import com.tcm.training.admin.user.mapper.SysUserMapper;
import cn.dev33.satoken.stp.StpUtil;
import org.apache.ibatis.reflection.MetaObject;
import org.springframework.beans.factory.ObjectProvider;
import org.springframework.stereotype.Component;

@Component
public class AuditMetaObjectHandler implements MetaObjectHandler {

    private static final String SYSTEM_OPERATOR = "系统初始化";

    private final ObjectProvider<SysUserMapper> sysUserMapperProvider;

    public AuditMetaObjectHandler(ObjectProvider<SysUserMapper> sysUserMapperProvider) {
        this.sysUserMapperProvider = sysUserMapperProvider;
    }

    @Override
    public void insertFill(MetaObject metaObject) {
        String operatorName = resolveOperatorName();
        this.strictInsertFill(metaObject, "createdBy", String.class, operatorName);
        this.strictInsertFill(metaObject, "updatedBy", String.class, operatorName);
    }

    @Override
    public void updateFill(MetaObject metaObject) {
        this.setFieldValByName("updatedBy", resolveOperatorName(), metaObject);
    }

    private String resolveOperatorName() {
        try {
            if (!StpUtil.isLogin()) {
                return SYSTEM_OPERATOR;
            }
            Long userId = StpUtil.getLoginIdAsLong();
            SysUserMapper sysUserMapper = sysUserMapperProvider.getIfAvailable();
            if (sysUserMapper == null) {
                return SYSTEM_OPERATOR;
            }
            SysUser user = sysUserMapper.selectById(userId);
            if (user == null) {
                return SYSTEM_OPERATOR;
            }
            String nickname = user.getNickname();
            if (nickname == null || nickname.trim().isEmpty()) {
                return SYSTEM_OPERATOR;
            }
            return nickname.trim();
        } catch (Exception e) {
            return SYSTEM_OPERATOR;
        }
    }
}