/*
 * 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.state.internals;

import org.apache.kafka.common.serialization.Serde;
import org.apache.kafka.common.utils.Bytes;
import org.apache.kafka.common.utils.Time;
import org.apache.kafka.streams.state.WindowStore;

import java.util.Map;

/**
 * A {@link org.apache.kafka.streams.state.KeyValueStore} that stores all entries in a local RocksDB database.
 *
 * @param <K> the type of keys
 * @param <V> the type of values
 *
 * @see org.apache.kafka.streams.state.Stores#create(String)
 */

public class RocksDBWindowStoreSupplier<K, V> extends AbstractStoreSupplier<K, V, WindowStore> implements WindowStoreSupplier<WindowStore> {

    private final long retentionPeriod;
    private final boolean retainDuplicates;
    private final int numSegments;
    private final long windowSize;
    private final boolean enableCaching;

    public RocksDBWindowStoreSupplier(String name, long retentionPeriod, int numSegments, boolean retainDuplicates, Serde<K> keySerde, Serde<V> valueSerde, long windowSize, boolean logged, Map<String, String> logConfig, boolean enableCaching) {
        this(name, retentionPeriod, numSegments, retainDuplicates, keySerde, valueSerde, null, windowSize, logged, logConfig, enableCaching);
    }

    public RocksDBWindowStoreSupplier(String name, long retentionPeriod, int numSegments, boolean retainDuplicates, Serde<K> keySerde, Serde<V> valueSerde, Time time, long windowSize, boolean logged, Map<String, String> logConfig, boolean enableCaching) {
        super(name, keySerde, valueSerde, time, logged, logConfig);
        this.retentionPeriod = retentionPeriod;
        this.retainDuplicates = retainDuplicates;
        this.numSegments = numSegments;
        this.windowSize = windowSize;
        this.enableCaching = enableCaching;
    }

    public String name() {
        return name;
    }

    public WindowStore get() {
        return maybeWrapCaching(
                maybeWrapLogged(
                        new RocksDBSegmentedBytesStore(
                                name,
                                retentionPeriod,
                                numSegments,
                                new WindowKeySchema()
                        )));

    }

    @Override
    public long retentionPeriod() {
        return retentionPeriod;
    }

    private SegmentedBytesStore maybeWrapLogged(final SegmentedBytesStore inner) {
        if (!logged) {
            return inner;
        }
        return new ChangeLoggingSegmentedBytesStore(inner);
    }

    private WindowStore<K, V> maybeWrapCaching(final SegmentedBytesStore inner) {
        final MeteredSegmentedBytesStore metered = new MeteredSegmentedBytesStore(inner, "rocksdb-window", time);
        if (!enableCaching) {
            return new RocksDBWindowStore<>(metered, keySerde, valueSerde, retainDuplicates);
        }
        final RocksDBWindowStore<Bytes, byte[]> windowed = RocksDBWindowStore.bytesStore(metered, retainDuplicates);
        return new CachingWindowStore<>(windowed, keySerde, valueSerde, windowSize);
    }
}