/*
 * Copyright (c) 2008-2017, Hazelcast, Inc. All Rights Reserved.
 *
 * 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 com.hazelcast.client.map;

import com.hazelcast.client.test.TestHazelcastFactory;
import com.hazelcast.config.Config;
import com.hazelcast.config.MapConfig;
import com.hazelcast.config.MapStoreConfig;
import com.hazelcast.core.HazelcastInstance;
import com.hazelcast.core.IMap;
import com.hazelcast.core.MapStore;
import com.hazelcast.map.impl.mapstore.writebehind.MapStoreWithCounter;
import com.hazelcast.map.impl.mapstore.writebehind.TemporaryBlockerMapStore;
import com.hazelcast.test.AssertTask;
import com.hazelcast.test.HazelcastParallelClassRunner;
import com.hazelcast.test.HazelcastTestSupport;
import com.hazelcast.test.annotation.ParallelTest;
import com.hazelcast.test.annotation.QuickTest;
import org.junit.After;
import org.junit.Before;
import org.junit.Ignore;
import org.junit.Test;
import org.junit.experimental.categories.Category;
import org.junit.runner.RunWith;

import java.util.List;

import static com.hazelcast.map.impl.mapstore.writebehind.WriteBehindOnBackupsTest.writeBehindQueueSize;
import static java.util.Arrays.asList;
import static org.junit.Assert.assertEquals;

@RunWith(HazelcastParallelClassRunner.class)
@Category({QuickTest.class, ParallelTest.class})
public class ClientWriteBehindFlushTest extends HazelcastTestSupport {

    private static final String MAP_NAME = "default";

    private HazelcastInstance client;

    private HazelcastInstance member1;
    private HazelcastInstance member2;
    private HazelcastInstance member3;

    @Before
    public void setUp() throws Exception {
        MapStoreConfig mapStoreConfig = new MapStoreConfig();
        MapStoreWithCounter mapStore = new MapStoreWithCounter<Integer, String>();
        mapStoreConfig.setImplementation(mapStore).setWriteDelaySeconds(3000);

        Config config = getConfig();
        config.getMapConfig(MAP_NAME).setMapStoreConfig(mapStoreConfig);

        TestHazelcastFactory hazelcastFactory = new TestHazelcastFactory();
        member1 = hazelcastFactory.newHazelcastInstance(config);
        member2 = hazelcastFactory.newHazelcastInstance(config);
        member3 = hazelcastFactory.newHazelcastInstance(config);

        client = hazelcastFactory.newHazelcastClient();
    }

    @After
    public void tearDown() throws Exception {
        client.shutdown();

        member1.shutdown();
        member2.shutdown();
        member3.shutdown();
    }


    @Test
    @Ignore //https://github.com/hazelcast/hazelcast/issues/7492
    public void testWriteBehindQueues_emptied_onOwnerAndBackupNodes() throws Exception {
        IMap map = client.getMap(MAP_NAME);

        for (int i = 0; i < 1000; i++) {
            map.put(i, i);
        }

        map.flush();

        assertWriteBehindQueuesEmpty(MAP_NAME, asList(member1, member2, member3));
    }

    @Test
    public void testFlush_shouldNotCause_concurrentStoreOperation() throws Exception {
        int blockStoreOperationSeconds = 5;
        TemporaryBlockerMapStore store = new TemporaryBlockerMapStore(blockStoreOperationSeconds);
        Config config = newMapStoredConfig(store, 2);

        TestHazelcastFactory hazelcastFactory = new TestHazelcastFactory();
        hazelcastFactory.newHazelcastInstance(config);

        IMap<String, String> map = hazelcastFactory.newHazelcastClient().getMap(MAP_NAME);

        map.put("key", "value");
        map.flush();

        assertEquals("Expecting only one store after flush", 1, store.getStoreOperationCount());

        hazelcastFactory.shutdownAll();
    }

    protected Config newMapStoredConfig(MapStore store, int writeDelaySeconds) {
        MapStoreConfig mapStoreConfig = new MapStoreConfig();
        mapStoreConfig.setEnabled(true);
        mapStoreConfig.setWriteDelaySeconds(writeDelaySeconds);
        mapStoreConfig.setImplementation(store);

        Config config = getConfig();
        MapConfig mapConfig = config.getMapConfig(MAP_NAME);
        mapConfig.setMapStoreConfig(mapStoreConfig);

        return config;
    }

    protected void assertWriteBehindQueuesEmpty(final String mapName, final List<HazelcastInstance> nodes) {
        assertTrueEventually(new AssertTask() {
            @Override
            public void run() throws Exception {
                for (HazelcastInstance instance : nodes) {
                    assertEquals(0, writeBehindQueueSize(instance, mapName));
                }
            }
        });
    }

}