/*
 * Licensed to the Apache Software Foundation (ASF) under one or more
 * contributor license agreements.  See the NOTICE file distributed with
 * this work for additional information regarding copyright ownership.
 * The ASF licenses this file to You 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.
 */

package org.apache.shardingsphere.proxy.frontend.mysql.command.query.text.query;

import org.apache.shardingsphere.db.protocol.mysql.constant.MySQLCharacterSet;
import org.apache.shardingsphere.db.protocol.mysql.constant.MySQLConstants;
import org.apache.shardingsphere.db.protocol.mysql.packet.command.query.text.query.MySQLComQueryPacket;
import org.apache.shardingsphere.proxy.backend.response.header.query.QueryResponseHeader;
import org.apache.shardingsphere.proxy.backend.response.header.query.impl.QueryHeader;
import org.apache.shardingsphere.proxy.backend.response.header.update.UpdateResponseHeader;
import org.apache.shardingsphere.proxy.backend.session.ConnectionSession;
import org.apache.shardingsphere.proxy.backend.text.TextProtocolBackendHandler;
import org.apache.shardingsphere.proxy.frontend.command.executor.ResponseType;
import org.apache.shardingsphere.sql.parser.sql.common.statement.SQLStatement;
import org.junit.Before;
import org.junit.Test;
import org.junit.runner.RunWith;
import org.mockito.Answers;
import org.mockito.Mock;
import org.mockito.internal.util.reflection.FieldSetter;
import org.mockito.junit.MockitoJUnitRunner;

import java.sql.SQLException;
import java.util.Collections;

import static org.hamcrest.CoreMatchers.is;
import static org.junit.Assert.assertThat;
import static org.mockito.Mockito.mock;
import static org.mockito.Mockito.when;

@RunWith(MockitoJUnitRunner.class)
public final class MySQLComQueryPacketExecutorTest {
    
    @Mock
    private TextProtocolBackendHandler textProtocolBackendHandler;
    
    @Mock
    private MySQLComQueryPacket packet;
    
    @Mock(answer = Answers.RETURNS_DEEP_STUBS)
    private ConnectionSession connectionSession;
    
    @Before
    public void setUp() {
        when(packet.getSql()).thenReturn("");
        when(connectionSession.getAttributeMap().attr(MySQLConstants.MYSQL_CHARACTER_SET_ATTRIBUTE_KEY).get()).thenReturn(MySQLCharacterSet.UTF8MB4_GENERAL_CI);
    }
    
    @Test
    public void assertIsQueryResponse() throws SQLException, NoSuchFieldException {
        MySQLComQueryPacketExecutor mysqlComQueryPacketExecutor = new MySQLComQueryPacketExecutor(packet, connectionSession);
        FieldSetter.setField(mysqlComQueryPacketExecutor, MySQLComQueryPacketExecutor.class.getDeclaredField("textProtocolBackendHandler"), textProtocolBackendHandler);
        when(textProtocolBackendHandler.execute()).thenReturn(new QueryResponseHeader(Collections.singletonList(mock(QueryHeader.class))));
        mysqlComQueryPacketExecutor.execute();
        assertThat(mysqlComQueryPacketExecutor.getResponseType(), is(ResponseType.QUERY));
    }
    
    @Test
    public void assertIsUpdateResponse() throws SQLException, NoSuchFieldException {
        MySQLComQueryPacketExecutor mysqlComQueryPacketExecutor = new MySQLComQueryPacketExecutor(packet, connectionSession);
        FieldSetter.setField(mysqlComQueryPacketExecutor, MySQLComQueryPacketExecutor.class.getDeclaredField("textProtocolBackendHandler"), textProtocolBackendHandler);
        when(textProtocolBackendHandler.execute()).thenReturn(new UpdateResponseHeader(mock(SQLStatement.class)));
        mysqlComQueryPacketExecutor.execute();
        assertThat(mysqlComQueryPacketExecutor.getResponseType(), is(ResponseType.UPDATE));
    }
}
