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package org.javimmutable.collections.tree;

import org.javimmutable.collections.JImmutableMap;
import org.javimmutable.collections.common.AbstractJImmutableMultiset;

import javax.annotation.Nonnull;
import javax.annotation.concurrent.Immutable;
import java.util.Comparator;
import java.util.Map;
import java.util.TreeMap;

@Immutable
public class JImmutableTreeMultiset
        extends AbstractJImmutableMultiset
{
    @SuppressWarnings("unchecked")
    private static final JImmutableTreeMultiset EMPTY = new JImmutableTreeMultiset(new ComparableComparator());

    private final Comparator comparator;

    private JImmutableTreeMultiset(Comparator comparator)
    {
        this(JImmutableTreeMap.of(comparator), 0, comparator);
    }

    private JImmutableTreeMultiset(JImmutableMap map,
                                   int occurrences,
                                   Comparator comparator)
    {
        super(map, occurrences);
        this.comparator = comparator;
    }

    @Nonnull
    @Override
    public JImmutableTreeMultiset deleteAll()
    {
        return of(comparator);
    }

    public Comparator getComparator()
    {
        return comparator;
    }

    @SuppressWarnings("unchecked")
    public static > JImmutableTreeMultiset of()
    {
        return (JImmutableTreeMultiset)EMPTY;
    }

    public static  JImmutableTreeMultiset of(Comparator comparator)
    {
        return new JImmutableTreeMultiset<>(comparator);
    }

    @Override
    protected JImmutableTreeMultiset create(JImmutableMap map,
                                               int occurrences)
    {
        return new JImmutableTreeMultiset<>(map, occurrences, comparator);
    }

    @Override
    protected Map emptyMutableMap()
    {
        return new TreeMap<>(comparator);
    }
}