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/*
 * Copyright 2017-2020 the original author or authors.
 *
 * 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
 *
 *      https://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.springframework.data.redis.connection.lettuce;

import io.lettuce.core.ReadFrom;
import io.lettuce.core.api.StatefulConnection;
import io.lettuce.core.cluster.RedisClusterClient;
import io.lettuce.core.cluster.api.StatefulRedisClusterConnection;
import io.lettuce.core.cluster.pubsub.StatefulRedisClusterPubSubConnection;
import io.lettuce.core.codec.RedisCodec;
import io.lettuce.core.pubsub.StatefulRedisPubSubConnection;

import java.util.Optional;
import java.util.concurrent.CompletableFuture;

import org.springframework.lang.Nullable;
import org.springframework.util.Assert;

/**
 * Connection provider for Cluster connections.
 *
 * @author Mark Paluch
 * @author Christoph Strobl
 * @author Bruce Cloud
 * @since 2.0
 */
class ClusterConnectionProvider implements LettuceConnectionProvider, RedisClientProvider {

	private final RedisClusterClient client;
	private final RedisCodec codec;
	private final Optional readFrom;

	private final Object monitor = new Object();

	private volatile boolean initialized;

	/**
	 * Create new {@link ClusterConnectionProvider}.
	 *
	 * @param client must not be {@literal null}.
	 * @param codec must not be {@literal null}.
	 */
	ClusterConnectionProvider(RedisClusterClient client, RedisCodec codec) {
		this(client, codec, null);
	}

	/**
	 * Create new {@link ClusterConnectionProvider}.
	 *
	 * @param client must not be {@literal null}.
	 * @param codec must not be {@literal null}.
	 * @param readFrom can be {@literal null}.
	 * @since 2.1
	 */
	ClusterConnectionProvider(RedisClusterClient client, RedisCodec codec, @Nullable ReadFrom readFrom) {

		Assert.notNull(client, "Client must not be null!");
		Assert.notNull(codec, "Codec must not be null!");

		this.client = client;
		this.codec = codec;
		this.readFrom = Optional.ofNullable(readFrom);
	}

	/*
	 * (non-Javadoc)
	 * @see org.springframework.data.redis.connection.lettuce.LettuceConnectionProvider#getConnectionAsync(java.lang.Class)
	 */
	@Override
	public > CompletableFuture getConnectionAsync(Class connectionType) {

		if (!initialized) {

			// partitions have to be initialized before asynchronous usage.
			// Needs to happen only once. Initialize eagerly if
			// blocking is not an options.
			synchronized (monitor) {
				if (!initialized) {
					client.getPartitions();
					initialized = true;
				}
			}
		}

		if (connectionType.equals(StatefulRedisPubSubConnection.class)
			|| connectionType.equals(StatefulRedisClusterPubSubConnection.class)) {

			return client.connectPubSubAsync(codec) //
					.thenApply(connectionType::cast);
		}

		if (StatefulRedisClusterConnection.class.isAssignableFrom(connectionType)
				|| connectionType.equals(StatefulConnection.class)) {

			return client.connectAsync(codec) //
					.thenApply(connection -> {

						readFrom.ifPresent(connection::setReadFrom);
						return connectionType.cast(connection);
					});
		}

		return LettuceFutureUtils
				.failed(new UnsupportedOperationException("Connection type " + connectionType + " not supported!"));
	}

	/*
	 * (non-Javadoc)
	 * @see org.springframework.data.redis.connection.lettuce.RedisClientProvider#getRedisClient()
	 */
	@Override
	public RedisClusterClient getRedisClient() {
		return client;
	}
}