/*
 * Copyright 2011-2023 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 static org.assertj.core.api.Assertions.*;
import static org.mockito.Mockito.*;

import io.lettuce.core.RedisFuture;
import io.lettuce.core.pubsub.StatefulRedisPubSubConnection;
import io.lettuce.core.pubsub.api.async.RedisPubSubAsyncCommands;
import io.lettuce.core.pubsub.api.sync.RedisPubSubCommands;

import java.util.Collection;
import java.util.concurrent.CompletableFuture;

import org.junit.jupiter.api.BeforeEach;
import org.junit.jupiter.api.Test;

import org.springframework.data.redis.connection.MessageListener;
import org.springframework.data.redis.connection.RedisInvalidSubscriptionException;

/**
 * Unit test of {@link LettuceSubscription}
 *
 * @author Jennifer Hickey
 * @author Christoph Strobl
 * @author Mark Paluch
 */
class LettuceSubscriptionUnitTests {

	private LettuceSubscription subscription;

	private StatefulRedisPubSubConnection<byte[], byte[]> pubsub;

	private RedisPubSubCommands<byte[], byte[]> syncCommands;

	private RedisPubSubAsyncCommands<byte[], byte[]> asyncCommands;

	private LettuceConnectionProvider connectionProvider;

	@SuppressWarnings("unchecked")
	@BeforeEach
	void setUp() {

		pubsub = mock(StatefulRedisPubSubConnection.class);
		syncCommands = mock(RedisPubSubCommands.class);
		asyncCommands = mock(RedisPubSubAsyncCommands.class);
		connectionProvider = mock(LettuceConnectionProvider.class);

		when(pubsub.sync()).thenReturn(syncCommands);
		when(pubsub.async()).thenReturn(asyncCommands);
		subscription = new LettuceSubscription(mock(MessageListener.class), pubsub, connectionProvider);
	}

	@Test
	void testUnsubscribeAllAndClose() {

		subscription.subscribe(new byte[][] { "a".getBytes() });
		subscription.unsubscribe();

		verify(syncCommands).unsubscribe();
		verify(syncCommands, never()).punsubscribe();
		verify(connectionProvider).release(pubsub);
		verify(pubsub).removeListener(any(LettuceMessageListener.class));

		assertThat(subscription.isAlive()).isFalse();
		assertThat(subscription.getChannels()).isEmpty();
		assertThat(subscription.getPatterns()).isEmpty();
	}

	@Test
	void testUnsubscribeAllChannelsWithPatterns() {

		subscription.subscribe(new byte[][] { "a".getBytes() });
		subscription.pSubscribe(new byte[][] { "s*".getBytes() });
		subscription.unsubscribe();

		verify(syncCommands).unsubscribe();
		verify(syncCommands, never()).punsubscribe();

		assertThat(subscription.isAlive()).isTrue();
		assertThat(subscription.getChannels()).isEmpty();

		Collection<byte[]> patterns = subscription.getPatterns();
		assertThat(patterns).hasSize(1);
		assertThat(patterns.iterator().next()).isEqualTo("s*".getBytes());
	}

	@Test
	void testUnsubscribeChannelAndClose() {

		byte[][] channel = new byte[][] { "a".getBytes() };

		subscription.subscribe(channel);
		subscription.unsubscribe(channel);

		verify(syncCommands).unsubscribe(channel);
		verify(syncCommands, never()).unsubscribe();
		verify(syncCommands, never()).punsubscribe();
		verify(connectionProvider).release(pubsub);
		verify(pubsub).removeListener(any(LettuceMessageListener.class));

		assertThat(subscription.isAlive()).isFalse();
		assertThat(subscription.getChannels()).isEmpty();
		assertThat(subscription.getPatterns()).isEmpty();
	}

	@Test
	void testUnsubscribeChannelSomeLeft() {

		byte[][] channels = new byte[][] { "a".getBytes(), "b".getBytes() };

		subscription.subscribe(channels);
		subscription.unsubscribe(new byte[][] { "a".getBytes() });

		verify(syncCommands).unsubscribe(new byte[][] { "a".getBytes() });
		verify(syncCommands, never()).unsubscribe();
		verify(syncCommands, never()).punsubscribe();

		assertThat(subscription.isAlive()).isTrue();

		Collection<byte[]> subChannels = subscription.getChannels();
		assertThat(subChannels).hasSize(1);
		assertThat(subChannels.iterator().next()).isEqualTo("b".getBytes());
		assertThat(subscription.getPatterns()).isEmpty();
	}

	@Test
	void testUnsubscribeChannelWithPatterns() {

		byte[][] channel = new byte[][] { "a".getBytes() };

		subscription.subscribe(channel);
		subscription.pSubscribe(new byte[][] { "s*".getBytes() });
		subscription.unsubscribe(channel);

		verify(syncCommands).unsubscribe(channel);
		verify(syncCommands, never()).unsubscribe();
		verify(syncCommands, never()).punsubscribe();

		assertThat(subscription.isAlive()).isTrue();
		assertThat(subscription.getChannels()).isEmpty();

		Collection<byte[]> patterns = subscription.getPatterns();
		assertThat(patterns).hasSize(1);
		assertThat(patterns.iterator().next()).isEqualTo("s*".getBytes());
	}

	@Test
	void testUnsubscribeChannelWithPatternsSomeLeft() {

		byte[][] channel = new byte[][] { "a".getBytes() };

		subscription.subscribe("a".getBytes(), "b".getBytes());
		subscription.pSubscribe(new byte[][] { "s*".getBytes() });
		subscription.unsubscribe(channel);

		verify(syncCommands).unsubscribe(channel);
		verify(syncCommands, never()).unsubscribe();
		verify(syncCommands, never()).punsubscribe();
		assertThat(subscription.isAlive()).isTrue();

		Collection<byte[]> channels = subscription.getChannels();
		assertThat(channels).hasSize(1);
		assertThat(channels.iterator().next()).isEqualTo("b".getBytes());

		Collection<byte[]> patterns = subscription.getPatterns();
		assertThat(patterns).hasSize(1);
		assertThat(patterns.iterator().next()).isEqualTo("s*".getBytes());
	}

	@Test
	void testUnsubscribeAllNoChannels() {

		subscription.pSubscribe(new byte[][] { "s*".getBytes() });
		subscription.unsubscribe();

		verify(syncCommands, never()).unsubscribe();
		verify(syncCommands, never()).punsubscribe();

		assertThat(subscription.isAlive()).isTrue();
		assertThat(subscription.getChannels()).isEmpty();

		Collection<byte[]> patterns = subscription.getPatterns();
		assertThat(patterns).hasSize(1);
		assertThat(patterns.iterator().next()).isEqualTo("s*".getBytes());
	}

	@Test
	void testUnsubscribeNotAlive() {

		subscription.subscribe(new byte[][] { "a".getBytes() });
		subscription.unsubscribe();

		verify(connectionProvider).release(pubsub);
		verify(pubsub).removeListener(any(LettuceMessageListener.class));

		assertThat(subscription.isAlive()).isFalse();

		subscription.unsubscribe();
		verify(syncCommands).unsubscribe();
		verify(syncCommands, never()).punsubscribe();
	}

	@Test
	void testSubscribeNotAlive() {

		subscription.subscribe(new byte[][] { "a".getBytes() });
		subscription.unsubscribe();

		assertThat(subscription.isAlive()).isFalse();

		assertThatExceptionOfType(RedisInvalidSubscriptionException.class)
				.isThrownBy(() -> subscription.subscribe(new byte[][] { "s".getBytes() }));
	}

	@Test
	void testPUnsubscribeAllAndClose() {

		subscription.pSubscribe(new byte[][] { "a*".getBytes() });
		subscription.pUnsubscribe();

		verify(syncCommands, never()).unsubscribe();
		verify(syncCommands).punsubscribe();
		verify(connectionProvider).release(pubsub);
		verify(pubsub).removeListener(any(LettuceMessageListener.class));

		assertThat(subscription.isAlive()).isFalse();
		assertThat(subscription.getChannels()).isEmpty();
		assertThat(subscription.getPatterns()).isEmpty();
	}

	@Test
	void testPUnsubscribeAllPatternsWithChannels() {

		subscription.subscribe(new byte[][] { "a".getBytes() });
		subscription.pSubscribe(new byte[][] { "s*".getBytes() });
		subscription.pUnsubscribe();

		verify(syncCommands, never()).unsubscribe();
		verify(syncCommands).punsubscribe();

		assertThat(subscription.isAlive()).isTrue();
		assertThat(subscription.getPatterns()).isEmpty();

		Collection<byte[]> channels = subscription.getChannels();
		assertThat(channels).hasSize(1);
		assertThat(channels.iterator().next()).isEqualTo("a".getBytes());
	}

	@Test
	void testPUnsubscribeAndClose() {

		byte[][] pattern = new byte[][] { "a*".getBytes() };

		subscription.pSubscribe(pattern);
		subscription.pUnsubscribe(pattern);

		verify(syncCommands, never()).unsubscribe();
		verify(syncCommands, never()).punsubscribe();
		verify(syncCommands).punsubscribe(pattern);
		verify(connectionProvider).release(pubsub);
		verify(pubsub).removeListener(any(LettuceMessageListener.class));

		assertThat(subscription.isAlive()).isFalse();
		assertThat(subscription.getChannels()).isEmpty();
		assertThat(subscription.getPatterns()).isEmpty();
	}

	@Test
	void testPUnsubscribePatternSomeLeft() {

		byte[][] patterns = new byte[][] { "a*".getBytes(), "b*".getBytes() };
		subscription.pSubscribe(patterns);
		subscription.pUnsubscribe(new byte[][] { "a*".getBytes() });

		verify(syncCommands).punsubscribe(new byte[][] { "a*".getBytes() });
		verify(syncCommands, never()).unsubscribe();
		verify(syncCommands, never()).punsubscribe();

		assertThat(subscription.isAlive()).isTrue();

		Collection<byte[]> subPatterns = subscription.getPatterns();
		assertThat(subPatterns).hasSize(1);
		assertThat(subPatterns.iterator().next()).isEqualTo("b*".getBytes());
		assertThat(subscription.getChannels()).isEmpty();
	}

	@Test
	void testPUnsubscribePatternWithChannels() {

		byte[][] pattern = new byte[][] { "s*".getBytes() };

		subscription.subscribe(new byte[][] { "a".getBytes() });
		subscription.pSubscribe(pattern);
		subscription.pUnsubscribe(pattern);

		verify(syncCommands).punsubscribe(pattern);
		verify(syncCommands, never()).unsubscribe();
		verify(syncCommands, never()).punsubscribe();

		assertThat(subscription.isAlive()).isTrue();
		assertThat(subscription.getPatterns()).isEmpty();

		Collection<byte[]> channels = subscription.getChannels();
		assertThat(channels).hasSize(1);
		assertThat(channels.iterator().next()).isEqualTo("a".getBytes());
	}

	@Test
	void testUnsubscribePatternWithChannelsSomeLeft() {

		byte[][] pattern = new byte[][] { "a*".getBytes() };

		subscription.pSubscribe("a*".getBytes(), "b*".getBytes());
		subscription.subscribe(new byte[][] { "a".getBytes() });
		subscription.pUnsubscribe(pattern);

		verify(syncCommands, never()).unsubscribe();
		verify(syncCommands, never()).punsubscribe();
		verify(syncCommands).punsubscribe(pattern);

		assertThat(subscription.isAlive()).isTrue();

		Collection<byte[]> channels = subscription.getChannels();
		assertThat(channels).hasSize(1);
		assertThat(channels.iterator().next()).isEqualTo("a".getBytes());

		Collection<byte[]> patterns = subscription.getPatterns();
		assertThat(patterns).hasSize(1);
		assertThat(patterns.iterator().next()).isEqualTo("b*".getBytes());
	}

	@Test
	void testPUnsubscribeAllNoPatterns() {

		subscription.subscribe(new byte[][] { "s".getBytes() });
		subscription.pUnsubscribe();

		verify(syncCommands, never()).unsubscribe();
		verify(syncCommands, never()).punsubscribe();
		assertThat(subscription.isAlive()).isTrue();
		assertThat(subscription.getPatterns()).isEmpty();

		Collection<byte[]> channels = subscription.getChannels();
		assertThat(channels).hasSize(1);
		assertThat(channels.iterator().next()).isEqualTo("s".getBytes());
	}

	@Test
	void testPUnsubscribeNotAlive() {

		subscription.subscribe(new byte[][] { "a".getBytes() });
		subscription.unsubscribe();

		assertThat(subscription.isAlive()).isFalse();

		subscription.pUnsubscribe();

		verify(connectionProvider).release(pubsub);
		verify(pubsub).removeListener(any(LettuceMessageListener.class));
		verify(syncCommands).unsubscribe();
		verify(syncCommands, never()).punsubscribe();
	}

	@Test
	void testPSubscribeNotAlive() {

		subscription.subscribe(new byte[][] { "a".getBytes() });
		subscription.unsubscribe();

		assertThat(subscription.isAlive()).isFalse();

		assertThatExceptionOfType(RedisInvalidSubscriptionException.class)
				.isThrownBy(() -> subscription.pSubscribe(new byte[][] { "s*".getBytes() }));
	}

	@Test
	void testDoCloseNotSubscribed() {

		subscription.doClose();

		verify(syncCommands, never()).unsubscribe();
		verify(syncCommands, never()).punsubscribe();
	}

	@Test
	void testDoCloseSubscribedChannels() {

		RedisFuture<Void> future = mock(RedisFuture.class);
		when(future.toCompletableFuture()).thenReturn(CompletableFuture.completedFuture(null));

		when(asyncCommands.unsubscribe()).thenReturn(future);
		when(asyncCommands.ping()).thenReturn((RedisFuture) future);

		subscription.subscribe(new byte[][] { "a".getBytes() });
		subscription.doClose();

		verify(asyncCommands).ping();
		verify(asyncCommands).unsubscribe();
		verifyNoMoreInteractions(asyncCommands);
	}

	@Test
	void testDoCloseSubscribedPatterns() {

		RedisFuture<Void> future = mock(RedisFuture.class);
		when(future.toCompletableFuture()).thenReturn(CompletableFuture.completedFuture(null));

		when(asyncCommands.punsubscribe()).thenReturn(future);
		when(asyncCommands.ping()).thenReturn((RedisFuture) future);

		subscription.pSubscribe(new byte[][] { "a*".getBytes() });
		subscription.doClose();

		verify(asyncCommands).ping();
		verify(asyncCommands).punsubscribe();
		verifyNoMoreInteractions(asyncCommands);
	}
}
