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/*
 * Copyright 2016-2017 Crown Copyright
 *
 * 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 uk.gov.gchq.gaffer.cache.impl;

import com.hazelcast.config.Config;
import com.hazelcast.config.FileSystemXmlConfig;
import com.hazelcast.core.Hazelcast;
import com.hazelcast.core.HazelcastInstance;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

import uk.gov.gchq.gaffer.cache.ICache;
import uk.gov.gchq.gaffer.cache.ICacheService;

import java.util.Properties;

import static uk.gov.gchq.gaffer.cache.util.CacheProperties.CACHE_CONFIG_FILE;

/**
 * Implementation of the {@link ICacheService} interface which uses a {@link HazelcastCache}
 * as the cache implementation.
 */
public class HazelcastCacheService implements ICacheService {
    private static final Logger LOGGER = LoggerFactory.getLogger(HazelcastCacheService.class);
    private HazelcastInstance hazelcast;

    private void configureHazelcast(final Properties properties) {
        if (null == hazelcast || !Hazelcast.getAllHazelcastInstances().contains(hazelcast)) {
            String configFile = properties.getProperty(CACHE_CONFIG_FILE);
            if (null == configFile) {
                LOGGER.warn("Config file not set using system property: " + CACHE_CONFIG_FILE
                        + ". Using default settings");

                hazelcast = Hazelcast.newHazelcastInstance();
            } else {
                try {
                    final Config config = new FileSystemXmlConfig(configFile);
                    hazelcast = Hazelcast.newHazelcastInstance(config);
                } catch (final Exception e) {
                    throw new IllegalArgumentException("Could not create cache using config path: " + configFile, e);
                }
            }
        }
    }

    @Override
    public void initialise(final Properties properties) {
        configureHazelcast(properties);
        LOGGER.info(hazelcast.getCluster().getClusterState().name()); // bootstraps hazelcast
    }

    @Override
    public void shutdown() {
        if (null != hazelcast && hazelcast.getLifecycleService().isRunning()) {
            hazelcast.shutdown();
        }
    }

    @Override
    public  ICache getCache(final String cacheName) {
        final ICache cache;
        if (null != hazelcast) {
            cache = new HazelcastCache<>(hazelcast.getMap(cacheName));
        } else {
            cache = null;
        }

        return cache;
    }
}