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/*
 * 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.cassandra.utils;

import java.util.Collection;
import java.util.Comparator;
import java.util.SortedMap;
import java.util.TreeMap;

import com.google.common.collect.SortedSetMultimap;
import com.google.common.collect.TreeMultimap;

public class SortedBiMultiValMap extends BiMultiValMap
{
    @SuppressWarnings("unchecked")
    private static final Comparator DEFAULT_COMPARATOR = (o1, o2) -> ((Comparable) o1).compareTo(o2);

    protected SortedBiMultiValMap(SortedMap forwardMap, SortedSetMultimap reverseMap)
    {
        super(forwardMap, reverseMap);
    }

    public static , V extends Comparable> SortedBiMultiValMap create()
    {
        return new SortedBiMultiValMap(new TreeMap(), TreeMultimap.create());
    }

    public static  SortedBiMultiValMap create(Comparator keyComparator, Comparator valueComparator)
    {
        if (keyComparator == null)
            keyComparator = defaultComparator();
        if (valueComparator == null)
            valueComparator = defaultComparator();
        return new SortedBiMultiValMap(new TreeMap(keyComparator), TreeMultimap.create(valueComparator, keyComparator));
    }

    public static , V extends Comparable> SortedBiMultiValMap create(BiMultiValMap map)
    {
        SortedBiMultiValMap newMap = SortedBiMultiValMap.create();
        copy(map, newMap);
        return newMap;
    }

    public static  SortedBiMultiValMap create(BiMultiValMap map, Comparator keyComparator, Comparator valueComparator)
    {
        SortedBiMultiValMap newMap = create(keyComparator, valueComparator);
        copy(map, newMap);
        return newMap;
    }

    private static  void copy(BiMultiValMap map, BiMultiValMap newMap)
    {
        newMap.forwardMap.putAll(map.forwardMap);
        // Put each individual TreeSet instead of Multimap#putAll(Multimap) to get linear complexity
        // See CASSANDRA-14660
        for (Entry> entry : map.inverse().asMap().entrySet())
            newMap.reverseMap.putAll(entry.getKey(), entry.getValue());
    }

    @SuppressWarnings("unchecked")
    private static  Comparator defaultComparator()
    {
        return DEFAULT_COMPARATOR;
    }
}