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/***************************************************************************
 * Copyright 2022 Kieker Project (http://kieker-monitoring.net)
 *
 * Licensed 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 kieker.analysis.plugin.reader.amqp;

import java.io.IOException;
import java.net.URISyntaxException;
import java.security.KeyManagementException;
import java.security.NoSuchAlgorithmException;
import java.util.concurrent.TimeoutException;

import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

import com.rabbitmq.client.Channel;
import com.rabbitmq.client.Connection;
import com.rabbitmq.client.ConnectionFactory;
import com.rabbitmq.client.QueueingConsumer;

import kieker.analysis.plugin.reader.newio.IRawDataProcessor;
import kieker.analysis.plugin.reader.newio.IRawDataReader;
import kieker.analysis.plugin.reader.newio.Outcome;
import kieker.common.configuration.Configuration;

/**
 * AMQP reader plugin that supports chunking using the new raw data I/O infrastructure.
 *
 * @author Holger Knoche
 *
 * @since 1.13
 * @deprecated since 1.15.1 old plugin api
 */
@Deprecated
public class ChunkingAmqpReader implements IRawDataReader {

	/** The name of the configuration property for the server URI. */
	public static final String CONFIG_PROPERTY_URI = "uri";
	/** The name of the configuration property for the AMQP queue name. */
	public static final String CONFIG_PROPERTY_QUEUENAME = "queueName";
	/** The name of the configuration property for the heartbeat timeout. */
	public static final String CONFIG_PROPERTY_HEARTBEAT = "heartbeat";

	private static final Logger LOGGER = LoggerFactory.getLogger(ChunkingAmqpReader.class);

	private final String uri;
	private final String queueName;
	private final int heartbeat;

	private final IRawDataProcessor processor;

	private volatile Connection connection;
	private volatile Channel channel;
	private volatile QueueingConsumer consumer;

	private volatile boolean terminated;

	public ChunkingAmqpReader(final Configuration configuration, final IRawDataProcessor processor) {
		this.uri = configuration.getStringProperty(CONFIG_PROPERTY_URI);
		this.queueName = configuration.getStringProperty(CONFIG_PROPERTY_QUEUENAME);
		this.heartbeat = configuration.getIntProperty(CONFIG_PROPERTY_HEARTBEAT);

		this.processor = processor;
	}

	@Override
	public Outcome onInitialization() {
		try {
			// Prepare the connection, channel and consumer
			this.connection = this.createConnection();
			this.channel = this.connection.createChannel();
			this.consumer = new QueueingConsumer(this.channel);

			return Outcome.SUCCESS;
		} catch (final KeyManagementException | NoSuchAlgorithmException | TimeoutException | URISyntaxException | IOException e) {
			this.handleInitializationError(e);

			return Outcome.FAILURE;
		}
	}

	private void handleInitializationError(final Throwable e) {
		LOGGER.error("An error occurred initializing the AMQP reader.", e);
	}

	private Connection createConnection() throws IOException, TimeoutException, KeyManagementException, NoSuchAlgorithmException, URISyntaxException {
		final ConnectionFactory connectionFactory = new ConnectionFactory();

		connectionFactory.setUri(this.uri);
		connectionFactory.setRequestedHeartbeat(this.heartbeat);

		return connectionFactory.newConnection();
	}

	@Override
	public Outcome read() {
		final IRawDataProcessor rawDataProcessor = this.processor;

		try {
			this.channel.basicConsume(this.queueName, true, this.consumer);

			while (!this.terminated) {
				// Read the next message and dispatch the received data to the processor
				final QueueingConsumer.Delivery delivery = this.consumer.nextDelivery();
				final byte[] body = delivery.getBody();

				rawDataProcessor.decodeAndDeliverRecords(body);
			}
		} catch (final IOException e) {
			LOGGER.error("Error while reading from queue {}", this.queueName, e);

			return Outcome.FAILURE;
		} catch (final InterruptedException e) {
			LOGGER.error("Consumer was interrupted on queue {}", this.queueName, e);

			return Outcome.FAILURE;
		}

		return Outcome.SUCCESS;
	}

	@Override
	public Outcome onTermination() {
		try {
			this.terminated = true;
			this.connection.close();

			return Outcome.SUCCESS;
		} catch (final IOException e) {
			LOGGER.error("IO error while trying to close the connection.", e);

			return Outcome.FAILURE;
		}

	}

}