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package org.javimmutable.collections.setmap;

import org.javimmutable.collections.JImmutableMap;
import org.javimmutable.collections.JImmutableSet;
import org.javimmutable.collections.JImmutableSetMap;
import org.javimmutable.collections.hash.JImmutableHashSet;
import org.javimmutable.collections.serialization.JImmutableTreeSetMapProxy;
import org.javimmutable.collections.tree.JImmutableTreeMap;

import javax.annotation.concurrent.Immutable;
import java.io.Serializable;
import java.util.Comparator;

/**
 * JImmutableSetMap implementation that allows keys to be traversed in sorted order using a Comparator
 * of the natural ordering of the keys if they implement Comparable.
 */
@Immutable
public class JImmutableTreeSetMap
    extends AbstractJImmutableSetMap
    implements Serializable
{
    @SuppressWarnings({"unchecked"})
    private static final JImmutableTreeSetMap EMPTY = new JImmutableTreeSetMap(JImmutableTreeMap.of(), JImmutableHashSet.of());
    private static final long serialVersionUID = -121805;

    private final Comparator comparator;

    private JImmutableTreeSetMap(JImmutableTreeMap> contents,
                                 JImmutableSet emptySet)
    {
        this(contents, contents.getComparator(), emptySet);
    }

    private JImmutableTreeSetMap(JImmutableMap> contents,
                                 Comparator comparator,
                                 JImmutableSet emptySet)
    {
        super(contents, emptySet);
        this.comparator = comparator;
    }

    /**
     * Constructs an empty set map whose keys are sorted in their natural ordering. The keys must
     * implement Comparable.
     */
    @SuppressWarnings("unchecked")
    public static , V> JImmutableTreeSetMap of()
    {
        return EMPTY;
    }

    /**
     * Constructs an empty set map using the specified Comparator. Note that the Comparator MUST BE IMMUTABLE.
     * The Comparator will be retained and used throughout the life of the map and its offspring and will
     * be aggressively shared, so it is imperative that the Comparator be completely immutable.
     */
    public static  JImmutableTreeSetMap of(Comparator comparator)
    {
        return new JImmutableTreeSetMap<>(JImmutableTreeMap.of(comparator), JImmutableHashSet.of());
    }

    public Comparator getComparator()
    {
        return comparator;
    }

    @Override
    public void checkInvariants()
    {
        checkSetMapInvariants();
    }

    @Override
    protected JImmutableSetMap create(JImmutableMap> map)
    {
        return new JImmutableTreeSetMap<>(map, comparator, emptySet);
    }

    JImmutableMap> getMap()
    {
        return contents;
    }

    private Object writeReplace()
    {
        return new JImmutableTreeSetMapProxy(this);
    }
}