/*
 *    Copyright (c) 2018-2025, lengleng All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions are met:
 *
 * Redistributions of source code must retain the above copyright notice,
 * this list of conditions and the following disclaimer.
 * Redistributions in binary form must reproduce the above copyright
 * notice, this list of conditions and the following disclaimer in the
 * documentation and/or other materials provided with the distribution.
 * Neither the name of the pig4cloud.com developer nor the names of its
 * contributors may be used to endorse or promote products derived from
 * this software without specific prior written permission.
 * Author: lengleng (wangiegie@gmail.com)
 */

package com.pig4cloud.pigx.common.core.datascope;

import cn.hutool.core.collection.CollectionUtil;
import cn.hutool.core.util.StrUtil;
import com.baomidou.mybatisplus.plugins.SqlParserHandler;
import com.baomidou.mybatisplus.toolkit.PluginUtils;
import lombok.extern.slf4j.Slf4j;
import org.apache.ibatis.executor.statement.StatementHandler;
import org.apache.ibatis.mapping.BoundSql;
import org.apache.ibatis.mapping.MappedStatement;
import org.apache.ibatis.mapping.SqlCommandType;
import org.apache.ibatis.plugin.*;
import org.apache.ibatis.reflection.MetaObject;
import org.apache.ibatis.reflection.SystemMetaObject;

import java.sql.Connection;
import java.util.List;
import java.util.Map;
import java.util.Properties;


/**
 * @author lengleng
 * @date 2018/8/30
 * <p>
 * mybatis 数据权限拦截器
 */
@Slf4j
@Intercepts({@Signature(type = StatementHandler.class, method = "prepare", args = {Connection.class, Integer.class})})
public class DataScopeInterceptor extends SqlParserHandler implements Interceptor {

	@Override
	public Object intercept(Invocation invocation) throws Throwable {
		StatementHandler statementHandler = (StatementHandler) PluginUtils.realTarget(invocation.getTarget());
		MetaObject metaObject = SystemMetaObject.forObject(statementHandler);
		this.sqlParser(metaObject);
		// 先判断是不是SELECT操作
		MappedStatement mappedStatement = (MappedStatement) metaObject.getValue("delegate.mappedStatement");
		if (!SqlCommandType.SELECT.equals(mappedStatement.getSqlCommandType())) {
			return invocation.proceed();
		}

		BoundSql boundSql = (BoundSql) metaObject.getValue("delegate.boundSql");
		String originalSql = boundSql.getSql();
		Object parameterObject = boundSql.getParameterObject();

		//查找参数中包含DataScope类型的参数
		DataScope dataScope = findDataScopeObject(parameterObject);

		if (dataScope == null) {
			return invocation.proceed();
		} else {
			String scopeName = dataScope.getScopeName();
			List<Integer> deptIds = dataScope.getDeptIds();
			if (StrUtil.isNotBlank(scopeName) && CollectionUtil.isNotEmpty(deptIds)) {
				String join = CollectionUtil.join(deptIds, ",");
				originalSql = "select * from (" + originalSql + ") temp_data_scope where temp_data_scope." + scopeName + " in (" + join + ")";
				metaObject.setValue("delegate.boundSql.sql", originalSql);
			}
			return invocation.proceed();
		}
	}

	/**
	 * 生成拦截对象的代理
	 *
	 * @param target 目标对象
	 * @return 代理对象
	 */
	@Override
	public Object plugin(Object target) {
		if (target instanceof StatementHandler) {
			return Plugin.wrap(target, this);
		}
		return target;
	}

	/**
	 * mybatis配置的属性
	 *
	 * @param properties mybatis配置的属性
	 */
	@Override
	public void setProperties(Properties properties) {

	}

	/**
	 * 查找参数是否包括DataScope对象
	 *
	 * @param parameterObj 参数列表
	 * @return DataScope
	 */
	private DataScope findDataScopeObject(Object parameterObj) {
		if (parameterObj instanceof DataScope) {
			return (DataScope) parameterObj;
		} else if (parameterObj instanceof Map) {
			for (Object val : ((Map<?, ?>) parameterObj).values()) {
				if (val instanceof DataScope) {
					return (DataScope) val;
				}
			}
		}
		return null;
	}

}
