/*
 * 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.flink.streaming.connectors.rabbitmq.common;

import com.rabbitmq.client.Channel;
import com.rabbitmq.client.Connection;
import com.rabbitmq.client.ConnectionFactory;
import org.apache.flink.configuration.Configuration;
import org.apache.flink.streaming.connectors.rabbitmq.RMQSink;
import org.apache.flink.streaming.util.serialization.SerializationSchema;
import org.junit.Before;
import org.junit.Test;

import java.io.IOException;

import static org.junit.Assert.assertEquals;
import static org.mockito.Mockito.*;

public class RMQSinkTest {

	private static final String QUEUE_NAME = "queue";
	private static final String MESSAGE_STR = "msg";
	private static final byte[] MESSAGE = new byte[1];

	private RMQConnectionConfig rmqConnectionConfig;
	private ConnectionFactory connectionFactory;
	private Connection connection;
	private Channel channel;
	private SerializationSchema<String> serializationSchema;


	@Before
	public void before() throws Exception {
		serializationSchema = spy(new DummySerializationSchema());
		rmqConnectionConfig = mock(RMQConnectionConfig.class);
		connectionFactory = mock(ConnectionFactory.class);
		connection = mock(Connection.class);
		channel = mock(Channel.class);

		when(rmqConnectionConfig.getConnectionFactory()).thenReturn(connectionFactory);
		when(connectionFactory.newConnection()).thenReturn(connection);
		when(connection.createChannel()).thenReturn(channel);
	}

	@Test
	public void openCallDeclaresQueue() throws Exception {
		createRMQSink();

		verify(channel).queueDeclare(QUEUE_NAME, false, false, false, null);
	}

	@Test
	public void throwExceptionIfChannelIsNull() throws Exception {
		when(connection.createChannel()).thenReturn(null);
		try {
			createRMQSink();
		} catch (RuntimeException ex) {
			assertEquals("None of RabbitMQ channels are available", ex.getMessage());
		}
	}

	private RMQSink<String> createRMQSink() throws Exception {
		RMQSink rmqSink = new RMQSink<String>(rmqConnectionConfig, QUEUE_NAME, serializationSchema);
		rmqSink.open(new Configuration());
		return rmqSink;
	}

	@Test
	public void invokePublishBytesToQueue() throws Exception {
		RMQSink<String> rmqSink = createRMQSink();

		rmqSink.invoke(MESSAGE_STR);
		verify(serializationSchema).serialize(MESSAGE_STR);
		verify(channel).basicPublish("", QUEUE_NAME, null, MESSAGE);
	}

	@Test(expected = RuntimeException.class)
	public void exceptionDuringPublishingIsNotIgnored() throws Exception {
		RMQSink<String> rmqSink = createRMQSink();

		doThrow(IOException.class).when(channel).basicPublish("", QUEUE_NAME, null, MESSAGE);
		rmqSink.invoke("msg");
	}

	@Test
	public void exceptionDuringPublishingIsIgnoredIfLogFailuresOnly() throws Exception {
		RMQSink<String> rmqSink = createRMQSink();
		rmqSink.setLogFailuresOnly(true);

		doThrow(IOException.class).when(channel).basicPublish("", QUEUE_NAME, null, MESSAGE);
		rmqSink.invoke("msg");
	}

	@Test
	public void closeAllResources() throws Exception {
		RMQSink<String> rmqSink = createRMQSink();

		rmqSink.close();

		verify(channel).close();
		verify(connection).close();
	}

	private class DummySerializationSchema implements SerializationSchema<String> {
		@Override
		public byte[] serialize(String element) {
			return MESSAGE;
		}
	}
}