/*
 * 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.kafka.streams;

import org.apache.kafka.common.serialization.LongSerializer;
import org.apache.kafka.common.serialization.Serdes;
import org.apache.kafka.common.serialization.StringSerializer;
import org.apache.kafka.common.utils.Bytes;
import org.apache.kafka.common.utils.Utils;
import org.apache.kafka.streams.errors.TopologyException;
import org.apache.kafka.streams.kstream.Consumed;
import org.apache.kafka.streams.kstream.ForeachAction;
import org.apache.kafka.streams.kstream.Grouped;
import org.apache.kafka.streams.kstream.JoinWindows;
import org.apache.kafka.streams.kstream.Joined;
import org.apache.kafka.streams.kstream.KStream;
import org.apache.kafka.streams.kstream.KTable;
import org.apache.kafka.streams.kstream.Materialized;
import org.apache.kafka.streams.kstream.Named;
import org.apache.kafka.streams.kstream.Printed;
import org.apache.kafka.streams.kstream.Produced;
import org.apache.kafka.streams.kstream.StreamJoined;
import org.apache.kafka.streams.kstream.ValueTransformer;
import org.apache.kafka.streams.kstream.ValueTransformerWithKey;
import org.apache.kafka.streams.processor.StateStore;
import org.apache.kafka.streams.processor.internals.InternalTopologyBuilder;
import org.apache.kafka.streams.processor.internals.ProcessorNode;
import org.apache.kafka.streams.processor.internals.ProcessorTopology;
import org.apache.kafka.streams.state.KeyValueStore;
import org.apache.kafka.test.MockMapper;
import org.apache.kafka.test.MockPredicate;
import org.apache.kafka.test.MockProcessorSupplier;
import org.apache.kafka.test.MockValueJoiner;
import org.apache.kafka.test.StreamsTestUtils;
import org.junit.Test;

import java.time.Duration;
import java.time.Instant;
import java.util.Arrays;
import java.util.Collections;
import java.util.HashMap;
import java.util.List;
import java.util.Map;
import java.util.Properties;

import static java.util.Arrays.asList;
import static org.hamcrest.CoreMatchers.equalTo;
import static org.hamcrest.MatcherAssert.assertThat;
import static org.junit.Assert.assertEquals;
import static org.junit.Assert.assertTrue;

public class StreamsBuilderTest {

    private static final String STREAM_TOPIC     = "stream-topic";

    private static final String STREAM_OPERATION_NAME = "stream-operation";

    private static final String STREAM_TOPIC_TWO = "stream-topic-two";

    private static final String TABLE_TOPIC      = "table-topic";

    private final StreamsBuilder builder = new StreamsBuilder();

    private final Properties props = StreamsTestUtils.getStreamsConfig(Serdes.String(), Serdes.String());

    @Test
    public void shouldNotThrowNullPointerIfOptimizationsNotSpecified() {
        final Properties properties = new Properties();

        final StreamsBuilder builder = new StreamsBuilder();
        builder.build(properties);
    }

    @Test
    public void shouldAllowJoinUnmaterializedFilteredKTable() {
        final KTable<Bytes, String> filteredKTable = builder
            .<Bytes, String>table(TABLE_TOPIC)
            .filter(MockPredicate.allGoodPredicate());
        builder
            .<Bytes, String>stream(STREAM_TOPIC)
            .join(filteredKTable, MockValueJoiner.TOSTRING_JOINER);
        builder.build();

        final ProcessorTopology topology =
            builder.internalTopologyBuilder.rewriteTopology(new StreamsConfig(props)).build();

        assertThat(
            topology.stateStores().size(),
            equalTo(1));
        assertThat(
            topology.processorConnectedStateStores("KSTREAM-JOIN-0000000005"),
            equalTo(Collections.singleton(topology.stateStores().get(0).name())));
        assertTrue(
            topology.processorConnectedStateStores("KTABLE-FILTER-0000000003").isEmpty());
    }

    @Test
    public void shouldAllowJoinMaterializedFilteredKTable() {
        final KTable<Bytes, String> filteredKTable = builder
            .<Bytes, String>table(TABLE_TOPIC)
            .filter(MockPredicate.allGoodPredicate(), Materialized.as("store"));
        builder
            .<Bytes, String>stream(STREAM_TOPIC)
            .join(filteredKTable, MockValueJoiner.TOSTRING_JOINER);
        builder.build();

        final ProcessorTopology topology =
            builder.internalTopologyBuilder.rewriteTopology(new StreamsConfig(props)).build();

        assertThat(
            topology.stateStores().size(),
            equalTo(1));
        assertThat(
            topology.processorConnectedStateStores("KSTREAM-JOIN-0000000005"),
            equalTo(Collections.singleton("store")));
        assertThat(
            topology.processorConnectedStateStores("KTABLE-FILTER-0000000003"),
            equalTo(Collections.singleton("store")));
    }

    @Test
    public void shouldAllowJoinUnmaterializedMapValuedKTable() {
        final KTable<Bytes, String> mappedKTable = builder
            .<Bytes, String>table(TABLE_TOPIC)
            .mapValues(MockMapper.noOpValueMapper());
        builder
            .<Bytes, String>stream(STREAM_TOPIC)
            .join(mappedKTable, MockValueJoiner.TOSTRING_JOINER);
        builder.build();

        final ProcessorTopology topology =
            builder.internalTopologyBuilder.rewriteTopology(new StreamsConfig(props)).build();

        assertThat(
            topology.stateStores().size(),
            equalTo(1));
        assertThat(
            topology.processorConnectedStateStores("KSTREAM-JOIN-0000000005"),
            equalTo(Collections.singleton(topology.stateStores().get(0).name())));
        assertTrue(
            topology.processorConnectedStateStores("KTABLE-MAPVALUES-0000000003").isEmpty());
    }

    @Test
    public void shouldAllowJoinMaterializedMapValuedKTable() {
        final KTable<Bytes, String> mappedKTable = builder
            .<Bytes, String>table(TABLE_TOPIC)
            .mapValues(MockMapper.noOpValueMapper(), Materialized.as("store"));
        builder
            .<Bytes, String>stream(STREAM_TOPIC)
            .join(mappedKTable, MockValueJoiner.TOSTRING_JOINER);
        builder.build();

        final ProcessorTopology topology =
            builder.internalTopologyBuilder.rewriteTopology(new StreamsConfig(props)).build();

        assertThat(
            topology.stateStores().size(),
            equalTo(1));
        assertThat(
            topology.processorConnectedStateStores("KSTREAM-JOIN-0000000005"),
            equalTo(Collections.singleton("store")));
        assertThat(
            topology.processorConnectedStateStores("KTABLE-MAPVALUES-0000000003"),
            equalTo(Collections.singleton("store")));
    }

    @Test
    public void shouldAllowJoinUnmaterializedJoinedKTable() {
        final KTable<Bytes, String> table1 = builder.table("table-topic1");
        final KTable<Bytes, String> table2 = builder.table("table-topic2");
        builder
            .<Bytes, String>stream(STREAM_TOPIC)
            .join(table1.join(table2, MockValueJoiner.TOSTRING_JOINER), MockValueJoiner.TOSTRING_JOINER);
        builder.build();

        final ProcessorTopology topology =
            builder.internalTopologyBuilder.rewriteTopology(new StreamsConfig(props)).build();

        assertThat(
            topology.stateStores().size(),
            equalTo(2));
        assertThat(
            topology.processorConnectedStateStores("KSTREAM-JOIN-0000000010"),
            equalTo(Utils.mkSet(topology.stateStores().get(0).name(), topology.stateStores().get(1).name())));
        assertTrue(
            topology.processorConnectedStateStores("KTABLE-MERGE-0000000007").isEmpty());
    }

    @Test
    public void shouldAllowJoinMaterializedJoinedKTable() {
        final KTable<Bytes, String> table1 = builder.table("table-topic1");
        final KTable<Bytes, String> table2 = builder.table("table-topic2");
        builder
            .<Bytes, String>stream(STREAM_TOPIC)
            .join(
                table1.join(table2, MockValueJoiner.TOSTRING_JOINER, Materialized.as("store")),
                MockValueJoiner.TOSTRING_JOINER);
        builder.build();

        final ProcessorTopology topology =
            builder.internalTopologyBuilder.rewriteTopology(new StreamsConfig(props)).build();

        assertThat(
            topology.stateStores().size(),
            equalTo(3));
        assertThat(
            topology.processorConnectedStateStores("KSTREAM-JOIN-0000000010"),
            equalTo(Collections.singleton("store")));
        assertThat(
            topology.processorConnectedStateStores("KTABLE-MERGE-0000000007"),
            equalTo(Collections.singleton("store")));
    }

    @Test
    public void shouldAllowJoinMaterializedSourceKTable() {
        final KTable<Bytes, String> table = builder.table(TABLE_TOPIC);
        builder.<Bytes, String>stream(STREAM_TOPIC).join(table, MockValueJoiner.TOSTRING_JOINER);
        builder.build();

        final ProcessorTopology topology =
            builder.internalTopologyBuilder.rewriteTopology(new StreamsConfig(props)).build();

        assertThat(
            topology.stateStores().size(),
            equalTo(1));
        assertThat(
            topology.processorConnectedStateStores("KTABLE-SOURCE-0000000002"),
            equalTo(Collections.singleton(topology.stateStores().get(0).name())));
        assertThat(
            topology.processorConnectedStateStores("KSTREAM-JOIN-0000000004"),
            equalTo(Collections.singleton(topology.stateStores().get(0).name())));
    }

    @Test
    public void shouldProcessingFromSinkTopic() {
        final KStream<String, String> source = builder.stream("topic-source");
        source.to("topic-sink");

        final MockProcessorSupplier<String, String> processorSupplier = new MockProcessorSupplier<>();
        source.process(processorSupplier);

        try (final TopologyTestDriver driver = new TopologyTestDriver(builder.build(), props)) {
            final TestInputTopic<String, String> inputTopic =
                    driver.createInputTopic("topic-source", new StringSerializer(), new StringSerializer(), Instant.ofEpochMilli(0L), Duration.ZERO);
            inputTopic.pipeInput("A", "aa");
        }

        // no exception was thrown
        assertEquals(Collections.singletonList(new KeyValueTimestamp<>("A", "aa", 0)),
                 processorSupplier.theCapturedProcessor().processed);
    }

    @Test
    public void shouldProcessViaThroughTopic() {
        final KStream<String, String> source = builder.stream("topic-source");
        final KStream<String, String> through = source.through("topic-sink");

        final MockProcessorSupplier<String, String> sourceProcessorSupplier = new MockProcessorSupplier<>();
        source.process(sourceProcessorSupplier);

        final MockProcessorSupplier<String, String> throughProcessorSupplier = new MockProcessorSupplier<>();
        through.process(throughProcessorSupplier);

        try (final TopologyTestDriver driver = new TopologyTestDriver(builder.build(), props)) {
            final TestInputTopic<String, String> inputTopic =
                    driver.createInputTopic("topic-source", new StringSerializer(), new StringSerializer(), Instant.ofEpochMilli(0L), Duration.ZERO);
            inputTopic.pipeInput("A", "aa");
        }

        assertEquals(Collections.singletonList(new KeyValueTimestamp<>("A", "aa", 0)), sourceProcessorSupplier.theCapturedProcessor().processed);
        assertEquals(Collections.singletonList(new KeyValueTimestamp<>("A", "aa", 0)), throughProcessorSupplier.theCapturedProcessor().processed);
    }
    
    @Test
    public void shouldMergeStreams() {
        final String topic1 = "topic-1";
        final String topic2 = "topic-2";

        final KStream<String, String> source1 = builder.stream(topic1);
        final KStream<String, String> source2 = builder.stream(topic2);
        final KStream<String, String> merged = source1.merge(source2);

        final MockProcessorSupplier<String, String> processorSupplier = new MockProcessorSupplier<>();
        merged.process(processorSupplier);

        try (final TopologyTestDriver driver = new TopologyTestDriver(builder.build(), props)) {
            final TestInputTopic<String, String> inputTopic1 =
                    driver.createInputTopic(topic1, new StringSerializer(), new StringSerializer(), Instant.ofEpochMilli(0L), Duration.ZERO);
            final TestInputTopic<String, String> inputTopic2 =
                    driver.createInputTopic(topic2, new StringSerializer(), new StringSerializer(), Instant.ofEpochMilli(0L), Duration.ZERO);

            inputTopic1.pipeInput("A", "aa");
            inputTopic2.pipeInput("B", "bb");
            inputTopic2.pipeInput("C", "cc");
            inputTopic1.pipeInput("D", "dd");
        }

        assertEquals(asList(new KeyValueTimestamp<>("A", "aa", 0),
                new KeyValueTimestamp<>("B", "bb", 0),
                new KeyValueTimestamp<>("C", "cc", 0),
                new KeyValueTimestamp<>("D", "dd", 0)), processorSupplier.theCapturedProcessor().processed);
    }

    @Test
    public void shouldUseSerdesDefinedInMaterializedToConsumeTable() {
        final Map<Long, String> results = new HashMap<>();
        final String topic = "topic";
        final ForeachAction<Long, String> action = results::put;
        builder.table(topic, Materialized.<Long, String, KeyValueStore<Bytes, byte[]>>as("store")
                .withKeySerde(Serdes.Long())
                .withValueSerde(Serdes.String()))
                .toStream().foreach(action);

        try (final TopologyTestDriver driver = new TopologyTestDriver(builder.build(), props)) {
            final TestInputTopic<Long, String> inputTopic =
                    driver.createInputTopic(topic, new LongSerializer(), new StringSerializer());
            inputTopic.pipeInput(1L, "value1");
            inputTopic.pipeInput(2L, "value2");

            final KeyValueStore<Long, String> store = driver.getKeyValueStore("store");
            assertThat(store.get(1L), equalTo("value1"));
            assertThat(store.get(2L), equalTo("value2"));
            assertThat(results.get(1L), equalTo("value1"));
            assertThat(results.get(2L), equalTo("value2"));
        }
    }

    @Test
    public void shouldUseSerdesDefinedInMaterializedToConsumeGlobalTable() {
        final String topic = "topic";
        builder.globalTable(topic, Materialized.<Long, String, KeyValueStore<Bytes, byte[]>>as("store")
                .withKeySerde(Serdes.Long())
                .withValueSerde(Serdes.String()));

        try (final TopologyTestDriver driver = new TopologyTestDriver(builder.build(), props)) {
            final TestInputTopic<Long, String> inputTopic =
                    driver.createInputTopic(topic, new LongSerializer(), new StringSerializer());
            inputTopic.pipeInput(1L, "value1");
            inputTopic.pipeInput(2L, "value2");
            final KeyValueStore<Long, String> store = driver.getKeyValueStore("store");

            assertThat(store.get(1L), equalTo("value1"));
            assertThat(store.get(2L), equalTo("value2"));
        }
    }

    @Test
    public void shouldNotMaterializeStoresIfNotRequired() {
        final String topic = "topic";
        builder.table(topic, Materialized.with(Serdes.Long(), Serdes.String()));

        final ProcessorTopology topology =
            builder.internalTopologyBuilder.rewriteTopology(new StreamsConfig(props)).build();

        assertThat(topology.stateStores().size(), equalTo(0));
    }

    @Test
    public void shouldReuseSourceTopicAsChangelogsWithOptimization20() {
        final String topic = "topic";
        builder.table(topic, Materialized.<Long, String, KeyValueStore<Bytes, byte[]>>as("store"));
        final Properties props = StreamsTestUtils.getStreamsConfig();
        props.put(StreamsConfig.TOPOLOGY_OPTIMIZATION, StreamsConfig.OPTIMIZE);
        final Topology topology = builder.build(props);

        final InternalTopologyBuilder internalTopologyBuilder = TopologyWrapper.getInternalTopologyBuilder(topology);
        internalTopologyBuilder.rewriteTopology(new StreamsConfig(props));

        assertThat(
            internalTopologyBuilder.build().storeToChangelogTopic(),
            equalTo(Collections.singletonMap("store", "topic")));
        assertThat(
            internalTopologyBuilder.stateStores().keySet(),
            equalTo(Collections.singleton("store")));
        assertThat(
            internalTopologyBuilder.stateStores().get("store").loggingEnabled(),
            equalTo(false));
        assertThat(
            internalTopologyBuilder.topicGroups().get(0).stateChangelogTopics.isEmpty(),
            equalTo(true));
    }

    @Test
    public void shouldNotReuseSourceTopicAsChangelogsByDefault() {
        final String topic = "topic";
        builder.table(topic, Materialized.<Long, String, KeyValueStore<Bytes, byte[]>>as("store"));

        final InternalTopologyBuilder internalTopologyBuilder = TopologyWrapper.getInternalTopologyBuilder(builder.build());
        internalTopologyBuilder.setApplicationId("appId");

        assertThat(
            internalTopologyBuilder.build().storeToChangelogTopic(),
            equalTo(Collections.singletonMap("store", "appId-store-changelog")));
        assertThat(
            internalTopologyBuilder.stateStores().keySet(),
            equalTo(Collections.singleton("store")));
        assertThat(
            internalTopologyBuilder.stateStores().get("store").loggingEnabled(),
            equalTo(true));
        assertThat(
            internalTopologyBuilder.topicGroups().get(0).stateChangelogTopics.keySet(),
            equalTo(Collections.singleton("appId-store-changelog")));
    }
    
    @Test(expected = TopologyException.class)
    public void shouldThrowExceptionWhenNoTopicPresent() {
        builder.stream(Collections.emptyList());
        builder.build();
    }

    @Test(expected = NullPointerException.class)
    public void shouldThrowExceptionWhenTopicNamesAreNull() {
        builder.stream(Arrays.asList(null, null));
        builder.build();
    }

    @Test
    public void shouldUseSpecifiedNameForStreamSourceProcessor() {
        final String expected = "source-node";
        builder.stream(STREAM_TOPIC, Consumed.as(expected));
        builder.stream(STREAM_TOPIC_TWO);
        builder.build();
        final ProcessorTopology topology = builder.internalTopologyBuilder.rewriteTopology(new StreamsConfig(props)).build();
        assertNamesForOperation(topology, expected, "KSTREAM-SOURCE-0000000001");
    }

    @Test
    public void shouldUseSpecifiedNameForTableSourceProcessor() {
        final String expected = "source-node";
        builder.table(STREAM_TOPIC, Consumed.as(expected));
        builder.table(STREAM_TOPIC_TWO);
        builder.build();

        final ProcessorTopology topology = builder.internalTopologyBuilder.rewriteTopology(new StreamsConfig(props)).build();

        assertNamesForOperation(
                topology,
                expected + "-source",
                expected,
                "KSTREAM-SOURCE-0000000004",
                "KTABLE-SOURCE-0000000005");
    }

    @Test
    public void shouldUseSpecifiedNameForGlobalTableSourceProcessor() {
        final String expected = "source-processor";
        builder.globalTable(STREAM_TOPIC, Consumed.as(expected));
        builder.globalTable(STREAM_TOPIC_TWO);
        builder.build();
        final ProcessorTopology topology = builder.internalTopologyBuilder.rewriteTopology(new StreamsConfig(props)).build();

        assertNamesForStateStore(
                topology.globalStateStores(),
                "stream-topic-STATE-STORE-0000000000",
                "stream-topic-two-STATE-STORE-0000000003"
        );
    }

    @Test
    public void shouldUseSpecifiedNameForSinkProcessor() {
        final String expected = "sink-processor";
        final KStream<Object, Object> stream = builder.stream(STREAM_TOPIC);
        stream.to(STREAM_TOPIC_TWO, Produced.as(expected));
        stream.to(STREAM_TOPIC_TWO);
        builder.build();
        final ProcessorTopology topology = builder.internalTopologyBuilder.rewriteTopology(new StreamsConfig(props)).build();
        assertNamesForOperation(topology, "KSTREAM-SOURCE-0000000000", expected, "KSTREAM-SINK-0000000002");
    }

    @Test
    public void shouldUseSpecifiedNameForMapOperation() {
        builder.stream(STREAM_TOPIC).map(KeyValue::pair, Named.as(STREAM_OPERATION_NAME));
        builder.build();
        final ProcessorTopology topology = builder.internalTopologyBuilder.rewriteTopology(new StreamsConfig(props)).build();
        assertNamesForOperation(topology, "KSTREAM-SOURCE-0000000000", STREAM_OPERATION_NAME);
    }

    @Test
    public void shouldUseSpecifiedNameForMapValuesOperation() {
        builder.stream(STREAM_TOPIC).mapValues(v -> v, Named.as(STREAM_OPERATION_NAME));
        builder.build();
        final ProcessorTopology topology = builder.internalTopologyBuilder.rewriteTopology(new StreamsConfig(props)).build();
        assertNamesForOperation(topology, "KSTREAM-SOURCE-0000000000", STREAM_OPERATION_NAME);
    }

    @Test
    public void shouldUseSpecifiedNameForMapValuesWithKeyOperation() {
        builder.stream(STREAM_TOPIC).mapValues((k, v) -> v, Named.as(STREAM_OPERATION_NAME));
        builder.build();
        final ProcessorTopology topology = builder.internalTopologyBuilder.rewriteTopology(new StreamsConfig(props)).build();
        assertNamesForOperation(topology, "KSTREAM-SOURCE-0000000000", STREAM_OPERATION_NAME);
    }

    @Test
    public void shouldUseSpecifiedNameForFilterOperation() {
        builder.stream(STREAM_TOPIC).filter((k, v) -> true, Named.as(STREAM_OPERATION_NAME));
        builder.build();
        final ProcessorTopology topology = builder.internalTopologyBuilder.rewriteTopology(new StreamsConfig(props)).build();
        assertNamesForOperation(topology, "KSTREAM-SOURCE-0000000000", STREAM_OPERATION_NAME);
    }

    @Test
    public void shouldUseSpecifiedNameForForEachOperation() {
        builder.stream(STREAM_TOPIC).foreach((k, v) -> { }, Named.as(STREAM_OPERATION_NAME));
        builder.build();
        final ProcessorTopology topology = builder.internalTopologyBuilder.rewriteTopology(new StreamsConfig(props)).build();
        assertNamesForOperation(topology, "KSTREAM-SOURCE-0000000000", STREAM_OPERATION_NAME);
    }

    @Test
    public void shouldUseSpecifiedNameForTransform() {
        builder.stream(STREAM_TOPIC).transform(() -> null, Named.as(STREAM_OPERATION_NAME));
        builder.build();
        final ProcessorTopology topology = builder.internalTopologyBuilder.rewriteTopology(new StreamsConfig(props)).build();
        assertNamesForOperation(topology, "KSTREAM-SOURCE-0000000000", STREAM_OPERATION_NAME);
    }

    @Test
    @SuppressWarnings("unchecked")
    public void shouldUseSpecifiedNameForTransformValues() {
        builder.stream(STREAM_TOPIC).transformValues(() -> (ValueTransformer) null, Named.as(STREAM_OPERATION_NAME));
        builder.build();
        final ProcessorTopology topology = builder.internalTopologyBuilder.rewriteTopology(new StreamsConfig(props)).build();
        assertNamesForOperation(topology, "KSTREAM-SOURCE-0000000000", STREAM_OPERATION_NAME);
    }

    @Test
    @SuppressWarnings({"unchecked", "rawtypes"})
    public void shouldUseSpecifiedNameForTransformValuesWithKey() {
        builder.stream(STREAM_TOPIC).transformValues(() -> (ValueTransformerWithKey) null, Named.as(STREAM_OPERATION_NAME));
        builder.build();
        final ProcessorTopology topology = builder.internalTopologyBuilder.rewriteTopology(new StreamsConfig(props)).build();
        assertNamesForOperation(topology, "KSTREAM-SOURCE-0000000000", STREAM_OPERATION_NAME);
    }

    @Test
    @SuppressWarnings({"unchecked", "rawtypes"})
    public void shouldUseSpecifiedNameForBranchOperation() {
        builder.stream(STREAM_TOPIC)
                .branch(Named.as("branch-processor"), (k, v) -> true, (k, v) -> false);

        builder.build();
        final ProcessorTopology topology = builder.internalTopologyBuilder.rewriteTopology(new StreamsConfig(props)).build();
        assertNamesForOperation(topology,
                "KSTREAM-SOURCE-0000000000",
                "branch-processor",
                "branch-processor-predicate-0",
                "branch-processor-predicate-1");
    }

    @Test
    public void shouldUseSpecifiedNameForJoinOperationBetweenKStreamAndKTable() {
        final KStream<String, String> streamOne = builder.stream(STREAM_TOPIC);
        final KTable<String, String> streamTwo = builder.table("table-topic");
        streamOne.join(streamTwo, (value1, value2) -> value1, Joined.as(STREAM_OPERATION_NAME));
        builder.build();

        final ProcessorTopology topology = builder.internalTopologyBuilder.rewriteTopology(new StreamsConfig(props)).build();
        assertNamesForOperation(topology,
                "KSTREAM-SOURCE-0000000000",
                "KSTREAM-SOURCE-0000000002",
                "KTABLE-SOURCE-0000000003",
                STREAM_OPERATION_NAME);
    }

    @Test
    public void shouldUseSpecifiedNameForLeftJoinOperationBetweenKStreamAndKTable() {
        final KStream<String, String> streamOne = builder.stream(STREAM_TOPIC);
        final KTable<String, String> streamTwo = builder.table(STREAM_TOPIC_TWO);
        streamOne.leftJoin(streamTwo, (value1, value2) -> value1, Joined.as(STREAM_OPERATION_NAME));
        builder.build();

        final ProcessorTopology topology = builder.internalTopologyBuilder.rewriteTopology(new StreamsConfig(props)).build();
        assertNamesForOperation(topology,
                "KSTREAM-SOURCE-0000000000",
                "KSTREAM-SOURCE-0000000002",
                "KTABLE-SOURCE-0000000003",
                STREAM_OPERATION_NAME);
    }

    @Test
    public void shouldUseSpecifiedNameForLeftJoinOperationBetweenKStreamAndKStream() {
        final KStream<String, String> streamOne = builder.stream(STREAM_TOPIC);
        final KStream<String, String> streamTwo = builder.stream(STREAM_TOPIC_TWO);

        streamOne.leftJoin(streamTwo, (value1, value2) -> value1, JoinWindows.of(Duration.ofHours(1)), StreamJoined.<String, String, String>as(STREAM_OPERATION_NAME).withName(STREAM_OPERATION_NAME));
        builder.build();

        final ProcessorTopology topology = builder.internalTopologyBuilder.rewriteTopology(new StreamsConfig(props)).build();
        assertNamesForStateStore(topology.stateStores(),
                STREAM_OPERATION_NAME + "-this-join-store", STREAM_OPERATION_NAME + "-outer-other-join-store"
        );
        assertNamesForOperation(topology,
                "KSTREAM-SOURCE-0000000000",
                "KSTREAM-SOURCE-0000000001",
                STREAM_OPERATION_NAME + "-this-windowed",
                STREAM_OPERATION_NAME + "-other-windowed",
                STREAM_OPERATION_NAME + "-this-join",
                STREAM_OPERATION_NAME + "-outer-other-join",
                STREAM_OPERATION_NAME + "-merge");
    }

    @Test
    @Deprecated
    public void shouldUseGeneratedStoreNamesForLeftJoinOperationBetweenKStreamAndKStream() {
        final KStream<String, String> streamOne = builder.stream(STREAM_TOPIC);
        final KStream<String, String> streamTwo = builder.stream(STREAM_TOPIC_TWO);

        streamOne.leftJoin(streamTwo, (value1, value2) -> value1, JoinWindows.of(Duration.ofHours(1)), Joined.as(STREAM_OPERATION_NAME));
        builder.build();

        final ProcessorTopology topology = builder.internalTopologyBuilder.rewriteTopology(new StreamsConfig(props)).build();
        assertNamesForStateStore(topology.stateStores(),
            "KSTREAM-JOINTHIS-0000000004-store",
            "KSTREAM-OUTEROTHER-0000000005-store"
        );
        assertNamesForOperation(topology,
            "KSTREAM-SOURCE-0000000000",
            "KSTREAM-SOURCE-0000000001",
            STREAM_OPERATION_NAME + "-this-windowed",
            STREAM_OPERATION_NAME + "-other-windowed",
            STREAM_OPERATION_NAME + "-this-join",
            STREAM_OPERATION_NAME + "-outer-other-join",
            STREAM_OPERATION_NAME + "-merge");
    }

    @Test
    public void shouldUseSpecifiedNameForJoinOperationBetweenKStreamAndKStream() {
        final KStream<String, String> streamOne = builder.stream(STREAM_TOPIC);
        final KStream<String, String> streamTwo = builder.stream(STREAM_TOPIC_TWO);

        streamOne.join(streamTwo, (value1, value2) -> value1, JoinWindows.of(Duration.ofHours(1)), StreamJoined.<String, String, String>as(STREAM_OPERATION_NAME).withName(STREAM_OPERATION_NAME));
        builder.build();

        final ProcessorTopology topology = builder.internalTopologyBuilder.rewriteTopology(new StreamsConfig(props)).build();
        assertNamesForStateStore(topology.stateStores(),
                STREAM_OPERATION_NAME + "-this-join-store",
                STREAM_OPERATION_NAME + "-other-join-store"
        );
        assertNamesForOperation(topology,
                "KSTREAM-SOURCE-0000000000",
                "KSTREAM-SOURCE-0000000001",
                STREAM_OPERATION_NAME + "-this-windowed",
                STREAM_OPERATION_NAME + "-other-windowed",
                STREAM_OPERATION_NAME + "-this-join",
                STREAM_OPERATION_NAME + "-other-join",
                STREAM_OPERATION_NAME + "-merge");
    }

    @Test
    @Deprecated
    public void shouldUseGeneratedNameForJoinOperationBetweenKStreamAndKStream() {
        final KStream<String, String> streamOne = builder.stream(STREAM_TOPIC);
        final KStream<String, String> streamTwo = builder.stream(STREAM_TOPIC_TWO);

        streamOne.join(streamTwo, (value1, value2) -> value1, JoinWindows.of(Duration.ofHours(1)), Joined.as(STREAM_OPERATION_NAME));
        builder.build();

        final ProcessorTopology topology = builder.internalTopologyBuilder.rewriteTopology(new StreamsConfig(props)).build();
        assertNamesForStateStore(topology.stateStores(),
            "KSTREAM-JOINTHIS-0000000004-store",
            "KSTREAM-JOINOTHER-0000000005-store"
        );
        assertNamesForOperation(topology,
            "KSTREAM-SOURCE-0000000000",
            "KSTREAM-SOURCE-0000000001",
            STREAM_OPERATION_NAME + "-this-windowed",
            STREAM_OPERATION_NAME + "-other-windowed",
            STREAM_OPERATION_NAME + "-this-join",
            STREAM_OPERATION_NAME + "-other-join",
            STREAM_OPERATION_NAME + "-merge");
    }

    @Test
    public void shouldUseSpecifiedNameForOuterJoinOperationBetweenKStreamAndKStream() {
        final KStream<String, String> streamOne = builder.stream(STREAM_TOPIC);
        final KStream<String, String> streamTwo = builder.stream(STREAM_TOPIC_TWO);

        streamOne.outerJoin(streamTwo, (value1, value2) -> value1, JoinWindows.of(Duration.ofHours(1)), StreamJoined.<String, String, String>as(STREAM_OPERATION_NAME).withName(STREAM_OPERATION_NAME));
        builder.build();
        final ProcessorTopology topology = builder.internalTopologyBuilder.rewriteTopology(new StreamsConfig(props)).build();
        assertNamesForStateStore(topology.stateStores(),
                STREAM_OPERATION_NAME + "-outer-this-join-store",
                STREAM_OPERATION_NAME + "-outer-other-join-store");
        assertNamesForOperation(topology,
                "KSTREAM-SOURCE-0000000000",
                "KSTREAM-SOURCE-0000000001",
                STREAM_OPERATION_NAME + "-this-windowed",
                STREAM_OPERATION_NAME + "-other-windowed",
                STREAM_OPERATION_NAME + "-outer-this-join",
                STREAM_OPERATION_NAME + "-outer-other-join",
                STREAM_OPERATION_NAME + "-merge");

    }

    @Test
    @Deprecated
    public void shouldUseGeneratedStoreNamesForOuterJoinOperationBetweenKStreamAndKStream() {
        final KStream<String, String> streamOne = builder.stream(STREAM_TOPIC);
        final KStream<String, String> streamTwo = builder.stream(STREAM_TOPIC_TWO);

        streamOne.outerJoin(streamTwo, (value1, value2) -> value1, JoinWindows.of(Duration.ofHours(1)), Joined.as(STREAM_OPERATION_NAME));
        builder.build();

        final ProcessorTopology topology = builder.internalTopologyBuilder.rewriteTopology(new StreamsConfig(props)).build();
        assertNamesForStateStore(topology.stateStores(),
            "KSTREAM-OUTERTHIS-0000000004-store",
            "KSTREAM-OUTEROTHER-0000000005-store"
        );
        assertNamesForOperation(topology,
            "KSTREAM-SOURCE-0000000000",
            "KSTREAM-SOURCE-0000000001",
            STREAM_OPERATION_NAME + "-this-windowed",
            STREAM_OPERATION_NAME + "-other-windowed",
            STREAM_OPERATION_NAME + "-outer-this-join",
            STREAM_OPERATION_NAME + "-outer-other-join",
            STREAM_OPERATION_NAME + "-merge");
    }


    @Test
    public void shouldUseSpecifiedNameForMergeOperation() {
        final String topic1 = "topic-1";
        final String topic2 = "topic-2";

        final KStream<String, String> source1 = builder.stream(topic1);
        final KStream<String, String> source2 = builder.stream(topic2);
        source1.merge(source2, Named.as("merge-processor"));
        builder.build();
        final ProcessorTopology topology = builder.internalTopologyBuilder.rewriteTopology(new StreamsConfig(props)).build();
        assertNamesForOperation(topology, "KSTREAM-SOURCE-0000000000", "KSTREAM-SOURCE-0000000001", "merge-processor");
    }

    @Test
    public void shouldUseSpecifiedNameForProcessOperation() {
        builder.stream(STREAM_TOPIC)
                .process(() -> null, Named.as("test-processor"));

        builder.build();
        final ProcessorTopology topology = builder.internalTopologyBuilder.rewriteTopology(new StreamsConfig(props)).build();
        assertNamesForOperation(topology, "KSTREAM-SOURCE-0000000000", "test-processor");
    }

    @Test
    public void shouldUseSpecifiedNameForPrintOperation() {
        builder.stream(STREAM_TOPIC).print(Printed.toSysOut().withName("print-processor"));
        builder.build();
        final ProcessorTopology topology = builder.internalTopologyBuilder.rewriteTopology(new StreamsConfig(props)).build();
        assertNamesForOperation(topology, "KSTREAM-SOURCE-0000000000", "print-processor");
    }

    @Test
    @SuppressWarnings({"unchecked", "rawtypes"})
    public void shouldUseSpecifiedNameForFlatTransformValueOperation() {
        builder.stream(STREAM_TOPIC).flatTransformValues(() -> (ValueTransformer) null, Named.as(STREAM_OPERATION_NAME));
        builder.build();
        final ProcessorTopology topology = builder.internalTopologyBuilder.rewriteTopology(new StreamsConfig(props)).build();
        assertNamesForOperation(topology, "KSTREAM-SOURCE-0000000000", STREAM_OPERATION_NAME);
    }

    @Test
    @SuppressWarnings({"unchecked", "rawtypes"})
    public void shouldUseSpecifiedNameForFlatTransformValueWithKeyOperation() {
        builder.stream(STREAM_TOPIC).flatTransformValues(() -> (ValueTransformerWithKey) null, Named.as(STREAM_OPERATION_NAME));
        builder.build();
        final ProcessorTopology topology = builder.internalTopologyBuilder.rewriteTopology(new StreamsConfig(props)).build();
        assertNamesForOperation(topology, "KSTREAM-SOURCE-0000000000", STREAM_OPERATION_NAME);
    }

    @Test
    @SuppressWarnings("unchecked")
    public void shouldUseSpecifiedNameForToStream() {
        builder.table(STREAM_TOPIC)
                .toStream(Named.as("to-stream"));

        builder.build();
        final ProcessorTopology topology = builder.internalTopologyBuilder.rewriteTopology(new StreamsConfig(props)).build();
        assertNamesForOperation(topology,
                "KSTREAM-SOURCE-0000000001",
                "KTABLE-SOURCE-0000000002",
                "to-stream");
    }

    @Test
    @SuppressWarnings("unchecked")
    public void shouldUseSpecifiedNameForToStreamWithMapper() {
        builder.table(STREAM_TOPIC)
                .toStream(KeyValue::pair, Named.as("to-stream"));

        builder.build();
        final ProcessorTopology topology = builder.internalTopologyBuilder.rewriteTopology(new StreamsConfig(props)).build();
        assertNamesForOperation(topology,
                "KSTREAM-SOURCE-0000000001",
                "KTABLE-SOURCE-0000000002",
                "to-stream",
                "KSTREAM-KEY-SELECT-0000000004");
    }

    @Test
    public void shouldUseSpecifiedNameForAggregateOperationGivenTable() {
        builder.table(STREAM_TOPIC).groupBy(KeyValue::pair, Grouped.as("group-operation")).count(Named.as(STREAM_OPERATION_NAME));
        builder.build();
        final ProcessorTopology topology = builder.internalTopologyBuilder.rewriteTopology(new StreamsConfig(props)).build();
        assertNamesForStateStore(
            topology.stateStores(),
            STREAM_TOPIC + "-STATE-STORE-0000000000",
             "KTABLE-AGGREGATE-STATE-STORE-0000000004");

        assertNamesForOperation(
            topology,
            "KSTREAM-SOURCE-0000000001",
            "KTABLE-SOURCE-0000000002",
            "group-operation",
            STREAM_OPERATION_NAME + "-sink",
            STREAM_OPERATION_NAME + "-source",
            STREAM_OPERATION_NAME);
    }

    private static void assertNamesForOperation(final ProcessorTopology topology, final String... expected) {
        final List<ProcessorNode> processors = topology.processors();
        assertEquals("Invalid number of expected processors", expected.length, processors.size());
        for (int i = 0; i < expected.length; i++) {
            assertEquals(expected[i], processors.get(i).name());
        }
    }

    private static void assertNamesForStateStore(final List<StateStore> stores, final String... expected) {
        assertEquals("Invalid number of expected state stores", expected.length, stores.size());
        for (int i = 0; i < expected.length; i++) {
            assertEquals(expected[i], stores.get(i).name());
        }
    }
}
