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/*
 * Copyright (c) 2008-2018, 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.map.impl.mapstore;

import com.hazelcast.config.Config;
import com.hazelcast.config.MapConfig;
import com.hazelcast.config.MapStoreConfig;
import com.hazelcast.core.HazelcastInstance;
import com.hazelcast.core.PartitioningStrategy;
import com.hazelcast.logging.ILogger;
import com.hazelcast.map.impl.MapContainer;
import com.hazelcast.map.impl.MapServiceContext;
import com.hazelcast.map.impl.MapStoreWrapper;
import com.hazelcast.spi.NodeEngine;
import com.hazelcast.spi.serialization.SerializationService;
import com.hazelcast.util.IterableUtil;

import java.util.Properties;

import static com.hazelcast.map.impl.mapstore.MapStoreManagers.createWriteBehindManager;
import static com.hazelcast.map.impl.mapstore.MapStoreManagers.createWriteThroughManager;
import static com.hazelcast.map.impl.mapstore.StoreConstructor.createStore;

/**
 * Default impl. of {@link com.hazelcast.map.impl.mapstore.MapStoreContext}
 * One instance is created per map.
 */
final class BasicMapStoreContext implements MapStoreContext {

    private String mapName;

    private MapStoreManager mapStoreManager;

    private MapStoreWrapper storeWrapper;

    private MapServiceContext mapServiceContext;

    private MapStoreConfig mapStoreConfig;

    private BasicMapStoreContext() {
    }

    @Override
    public void start() {
        mapStoreManager.start();
    }

    @Override
    public void stop() {
        mapStoreManager.stop();
    }

    @Override
    public boolean isWriteBehindMapStoreEnabled() {
        final MapStoreConfig mapStoreConfig = getMapStoreConfig();
        return mapStoreConfig != null && mapStoreConfig.isEnabled()
                && mapStoreConfig.getWriteDelaySeconds() > 0;
    }

    @Override
    public boolean isMapLoader() {
        return storeWrapper.isMapLoader();
    }

    @Override
    public SerializationService getSerializationService() {
        return mapServiceContext.getNodeEngine().getSerializationService();
    }

    @Override
    public ILogger getLogger(Class clazz) {
        return mapServiceContext.getNodeEngine().getLogger(clazz);
    }

    @Override
    public String getMapName() {
        return mapName;
    }

    @Override
    public MapServiceContext getMapServiceContext() {
        return mapServiceContext;
    }

    @Override
    public MapStoreConfig getMapStoreConfig() {
        return mapStoreConfig;
    }

    @Override
    public MapStoreManager getMapStoreManager() {
        return mapStoreManager;
    }

    @Override
    public MapStoreWrapper getMapStoreWrapper() {
        return storeWrapper;
    }

    static MapStoreContext create(MapContainer mapContainer) {
        final BasicMapStoreContext context = new BasicMapStoreContext();
        final String mapName = mapContainer.getName();
        final MapServiceContext mapServiceContext = mapContainer.getMapServiceContext();
        final NodeEngine nodeEngine = mapServiceContext.getNodeEngine();
        final PartitioningStrategy partitioningStrategy = mapContainer.getPartitioningStrategy();
        final MapConfig mapConfig = mapContainer.getMapConfig();
        final MapStoreConfig mapStoreConfig = mapConfig.getMapStoreConfig();
        final ClassLoader configClassLoader = nodeEngine.getConfigClassLoader();
        // create store.
        final Object store = createStore(mapName, mapStoreConfig, configClassLoader);
        final MapStoreWrapper storeWrapper = new MapStoreWrapper(mapName, store);
        storeWrapper.instrument(nodeEngine);

        setStoreImplToWritableMapStoreConfig(nodeEngine, mapName, store);

        context.setMapName(mapName);
        context.setMapStoreConfig(mapStoreConfig);
        context.setPartitioningStrategy(partitioningStrategy);
        context.setMapServiceContext(mapServiceContext);
        context.setStoreWrapper(storeWrapper);

        final MapStoreManager mapStoreManager = createMapStoreManager(context);
        context.setMapStoreManager(mapStoreManager);

        // todo this is user code. it may also block map store creation.
        callLifecycleSupportInit(context);

        return context;
    }

    private static void setStoreImplToWritableMapStoreConfig(NodeEngine nodeEngine, String mapName, Object store) {
        final Config config = nodeEngine.getConfig();
        // get writable config (not read-only one) from node engine.
        final MapConfig mapConfig = config.getMapConfig(mapName);
        final MapStoreConfig mapStoreConfig = mapConfig.getMapStoreConfig();
        mapStoreConfig.setImplementation(store);
    }

    private static MapStoreManager createMapStoreManager(MapStoreContext mapStoreContext) {
        final MapStoreConfig mapStoreConfig = mapStoreContext.getMapStoreConfig();
        if (isWriteBehindMapStoreEnabled(mapStoreConfig)) {
            return createWriteBehindManager(mapStoreContext);
        }
        return createWriteThroughManager(mapStoreContext);
    }

    private static boolean isWriteBehindMapStoreEnabled(MapStoreConfig mapStoreConfig) {
        return mapStoreConfig != null && mapStoreConfig.isEnabled()
                && mapStoreConfig.getWriteDelaySeconds() > 0;
    }

    private static void callLifecycleSupportInit(MapStoreContext mapStoreContext) {
        final MapStoreWrapper mapStoreWrapper = mapStoreContext.getMapStoreWrapper();
        final MapServiceContext mapServiceContext = mapStoreContext.getMapServiceContext();
        final NodeEngine nodeEngine = mapServiceContext.getNodeEngine();
        final HazelcastInstance hazelcastInstance = nodeEngine.getHazelcastInstance();
        final MapStoreConfig mapStoreConfig = mapStoreContext.getMapStoreConfig();
        final Properties properties = mapStoreConfig.getProperties();
        final String mapName = mapStoreContext.getMapName();

        mapStoreWrapper.init(hazelcastInstance, properties, mapName);
    }

    @Override
    public Iterable