/*
 * 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.processor.internals;

import org.apache.kafka.clients.consumer.Consumer;
import org.apache.kafka.common.TopicPartition;
import org.apache.kafka.common.utils.LogContext;
import org.apache.kafka.common.utils.MockTime;
import org.apache.kafka.common.utils.Utils;
import org.apache.kafka.streams.StreamsConfig;
import org.apache.kafka.streams.errors.LockException;
import org.apache.kafka.streams.processor.StateStore;
import org.apache.kafka.streams.processor.TaskId;
import org.apache.kafka.test.InternalMockProcessorContext;
import org.apache.kafka.test.MockRestoreCallback;
import org.apache.kafka.test.MockStateRestoreListener;
import org.apache.kafka.test.TestUtils;
import org.easymock.EasyMock;
import org.junit.Before;
import org.junit.Test;

import java.io.File;
import java.io.IOException;
import java.time.Duration;
import java.util.ArrayList;
import java.util.Collections;
import java.util.HashMap;
import java.util.Map;
import java.util.Properties;
import java.util.Set;

import static org.apache.kafka.streams.processor.internals.ProcessorTopologyFactories.withLocalStores;
import static org.easymock.EasyMock.expect;
import static org.junit.Assert.assertFalse;
import static org.junit.Assert.assertTrue;
import static org.junit.Assert.fail;

public class AbstractTaskTest {

    private final TaskId id = new TaskId(0, 0);
    private StateDirectory stateDirectory  = EasyMock.createMock(StateDirectory.class);
    private final TopicPartition storeTopicPartition1 = new TopicPartition("t1", 0);
    private final TopicPartition storeTopicPartition2 = new TopicPartition("t2", 0);
    private final TopicPartition storeTopicPartition3 = new TopicPartition("t3", 0);
    private final TopicPartition storeTopicPartition4 = new TopicPartition("t4", 0);
    private final Set<TopicPartition> storeTopicPartitions =
        Utils.mkSet(storeTopicPartition1, storeTopicPartition2, storeTopicPartition3, storeTopicPartition4);

    @Before
    public void before() {
        expect(stateDirectory.directoryForTask(id)).andReturn(TestUtils.tempDirectory());
    }

    @Test
    public void shouldThrowLockExceptionIfFailedToLockStateDirectoryWhenTopologyHasStores() throws IOException {
        final Consumer consumer = EasyMock.createNiceMock(Consumer.class);
        final StateStore store = EasyMock.createNiceMock(StateStore.class);
        expect(store.name()).andReturn("dummy-store-name").anyTimes();
        EasyMock.replay(store);
        expect(stateDirectory.lock(id)).andReturn(false);
        EasyMock.replay(stateDirectory);

        final AbstractTask task = createTask(consumer, Collections.singletonMap(store, "dummy"));

        try {
            task.registerStateStores();
            fail("Should have thrown LockException");
        } catch (final LockException e) {
            // ok
        }

    }

    @Test
    public void shouldNotAttemptToLockIfNoStores() {
        final Consumer consumer = EasyMock.createNiceMock(Consumer.class);
        EasyMock.replay(stateDirectory);

        final AbstractTask task = createTask(consumer, Collections.<StateStore, String>emptyMap());

        task.registerStateStores();

        // should fail if lock is called
        EasyMock.verify(stateDirectory);
    }

    @Test
    public void shouldDeleteAndRecreateStoreDirectoryOnReinitialize() throws IOException {
        final StreamsConfig streamsConfig = new StreamsConfig(new Properties() {
            {
                put(StreamsConfig.APPLICATION_ID_CONFIG, "app-id");
                put(StreamsConfig.BOOTSTRAP_SERVERS_CONFIG, "localhost:9092");
                put(StreamsConfig.STATE_DIR_CONFIG, TestUtils.tempDirectory().getAbsolutePath());
            }
        });
        final Consumer consumer = EasyMock.createNiceMock(Consumer.class);

        final StateStore store1 = EasyMock.createNiceMock(StateStore.class);
        final StateStore store2 = EasyMock.createNiceMock(StateStore.class);
        final StateStore store3 = EasyMock.createNiceMock(StateStore.class);
        final StateStore store4 = EasyMock.createNiceMock(StateStore.class);
        final String storeName1 = "storeName1";
        final String storeName2 = "storeName2";
        final String storeName3 = "storeName3";
        final String storeName4 = "storeName4";

        expect(store1.name()).andReturn(storeName1).anyTimes();
        EasyMock.replay(store1);
        expect(store2.name()).andReturn(storeName2).anyTimes();
        EasyMock.replay(store2);
        expect(store3.name()).andReturn(storeName3).anyTimes();
        EasyMock.replay(store3);
        expect(store4.name()).andReturn(storeName4).anyTimes();
        EasyMock.replay(store4);

        final StateDirectory stateDirectory = new StateDirectory(streamsConfig, new MockTime(), true);
        final AbstractTask task = createTask(
            consumer,
            new HashMap<StateStore, String>() {
                {
                    put(store1, storeTopicPartition1.topic());
                    put(store2, storeTopicPartition2.topic());
                    put(store3, storeTopicPartition3.topic());
                    put(store4, storeTopicPartition4.topic());
                }
            },
            stateDirectory);

        final String taskDir = stateDirectory.directoryForTask(task.id).getAbsolutePath();
        final File storeDirectory1 = new File(taskDir
            + File.separator + "rocksdb"
            + File.separator + storeName1);
        final File storeDirectory2 = new File(taskDir
            + File.separator + "rocksdb"
            + File.separator + storeName2);
        final File storeDirectory3 = new File(taskDir
            + File.separator + storeName3);
        final File storeDirectory4 = new File(taskDir
            + File.separator + storeName4);
        final File testFile1 = new File(storeDirectory1.getAbsolutePath() + File.separator + "testFile");
        final File testFile2 = new File(storeDirectory2.getAbsolutePath() + File.separator + "testFile");
        final File testFile3 = new File(storeDirectory3.getAbsolutePath() + File.separator + "testFile");
        final File testFile4 = new File(storeDirectory4.getAbsolutePath() + File.separator + "testFile");

        storeDirectory1.mkdirs();
        storeDirectory2.mkdirs();
        storeDirectory3.mkdirs();
        storeDirectory4.mkdirs();

        testFile1.createNewFile();
        assertTrue(testFile1.exists());
        testFile2.createNewFile();
        assertTrue(testFile2.exists());
        testFile3.createNewFile();
        assertTrue(testFile3.exists());
        testFile4.createNewFile();
        assertTrue(testFile4.exists());

        task.processorContext = new InternalMockProcessorContext(stateDirectory.directoryForTask(task.id), streamsConfig);

        task.stateMgr.register(store1, new MockRestoreCallback());
        task.stateMgr.register(store2, new MockRestoreCallback());
        task.stateMgr.register(store3, new MockRestoreCallback());
        task.stateMgr.register(store4, new MockRestoreCallback());

        // only reinitialize store1 and store3 -- store2 and store4 should be untouched
        task.reinitializeStateStoresForPartitions(Utils.mkSet(storeTopicPartition1, storeTopicPartition3));

        assertFalse(testFile1.exists());
        assertTrue(testFile2.exists());
        assertFalse(testFile3.exists());
        assertTrue(testFile4.exists());
    }

    private AbstractTask createTask(final Consumer consumer,
                                    final Map<StateStore, String> stateStoresToChangelogTopics) {
        return createTask(consumer, stateStoresToChangelogTopics, stateDirectory);
    }

    @SuppressWarnings("unchecked")
    private AbstractTask createTask(final Consumer consumer,
                                    final Map<StateStore, String> stateStoresToChangelogTopics,
                                    final StateDirectory stateDirectory) {
        final Properties properties = new Properties();
        properties.put(StreamsConfig.APPLICATION_ID_CONFIG, "app");
        properties.put(StreamsConfig.BOOTSTRAP_SERVERS_CONFIG, "dummyhost:9092");
        final StreamsConfig config = new StreamsConfig(properties);

        final Map<String, String> storeNamesToChangelogTopics = new HashMap<>(stateStoresToChangelogTopics.size());
        for (final Map.Entry<StateStore, String> e : stateStoresToChangelogTopics.entrySet()) {
            storeNamesToChangelogTopics.put(e.getKey().name(), e.getValue());
        }

        return new AbstractTask(id,
                                storeTopicPartitions,
                                withLocalStores(new ArrayList<>(stateStoresToChangelogTopics.keySet()),
                                                storeNamesToChangelogTopics),
                                consumer,
                                new StoreChangelogReader(consumer,
                                                         Duration.ZERO,
                                                         new MockStateRestoreListener(),
                                                         new LogContext("stream-task-test ")),
                                false,
                                stateDirectory,
                                config) {

            @Override
            public void initializeMetadata() {}

            @Override
            public void resume() {}

            @Override
            public void commit() {}

            @Override
            public void close(final boolean clean, final boolean isZombie) {}

            @Override
            public boolean initializeStateStores() {
                return false;
            }

            @Override
            public void initializeTopology() {}
        };
    }
}
