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/*
 * Copyright (c) 2008-2015, 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;

import com.hazelcast.config.MaxSizeConfig;
import com.hazelcast.config.MaxSizeConfig.MaxSizePolicy;
import com.hazelcast.core.IFunction;
import com.hazelcast.nio.serialization.Data;
import com.hazelcast.partition.InternalPartitionService;
import com.hazelcast.util.CollectionUtil;
import com.hazelcast.util.UnmodifiableIterator;

import java.util.HashMap;
import java.util.Iterator;
import java.util.List;
import java.util.Map;
import java.util.Map.Entry;
import java.util.NoSuchElementException;

import static com.hazelcast.map.impl.eviction.MaxSizeChecker.getApproximateMaxSize;

public final class MapKeyLoaderUtil {

    private MapKeyLoaderUtil() {
    }

    static MapKeyLoader.Role assignRole(InternalPartitionService partitionService, int mapNamePartition, int partitionId) {

        boolean isPartitionOwner = partitionService.isPartitionOwner(partitionId);
        boolean isMapPartition = (mapNamePartition == partitionId);

        if (isMapPartition) {
            return isPartitionOwner ? MapKeyLoader.Role.SENDER : MapKeyLoader.Role.SENDER_BACKUP;
        }

        return isPartitionOwner ? MapKeyLoader.Role.RECEIVER : MapKeyLoader.Role.NONE;
    }

    static Iterator>> toBatches(final Iterator> entries,
            final int maxBatch) {

        return new UnmodifiableIterator>>() {
            @Override
            public boolean hasNext() {
                return entries.hasNext();
            }

            @Override
            public Map> next() {
                if (!entries.hasNext()) {
                    throw new NoSuchElementException();
                }
                return nextBatch(entries, maxBatch);
            }
        };
    }

    static Map> nextBatch(Iterator> entries, int maxBatch) {

        Map> batch = new HashMap>();

        while (entries.hasNext()) {
            Entry e = entries.next();
            List partitionKeys = CollectionUtil.addToValueList(batch, e.getKey(), e.getValue());

            if (partitionKeys.size() >= maxBatch) {
                break;
            }
        }

        return batch;
    }

    public static int getMaxSizePerNode(MaxSizeConfig maxSizeConfig) {

        int maxSizePerNode = getApproximateMaxSize(maxSizeConfig, MaxSizePolicy.PER_NODE);

        if (maxSizePerNode == MaxSizeConfig.DEFAULT_MAX_SIZE) {
            // unlimited
            return -1;
        }

        return maxSizePerNode;
    }

    static IFunction> toPartition(final InternalPartitionService partitionService) {
        return new IFunction>() {
            @Override
            public Entry apply(Data input) {
                Integer partition = partitionService.getPartitionId(input);
                return new MapEntrySimple(partition, input);
            }
        };
    }

}