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package org.javimmutable.collections.listmap;

import org.javimmutable.collections.JImmutableList;
import org.javimmutable.collections.JImmutableListMap;
import org.javimmutable.collections.JImmutableMap;
import org.javimmutable.collections.list.JImmutableTreeList;
import org.javimmutable.collections.serialization.JImmutableTreeListMapProxy;
import org.javimmutable.collections.tree.JImmutableTreeMap;

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

/**
 * JImmutableListMap 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 JImmutableTreeListMap
    extends AbstractJImmutableListMap
    implements Serializable
{
    @SuppressWarnings({"unchecked"})
    private static final JImmutableTreeListMap EMPTY = new JImmutableTreeListMap(JImmutableTreeMap.of(), JImmutableTreeList.of());
    private static final long serialVersionUID = -121805;

    private final Comparator comparator;

    private JImmutableTreeListMap(JImmutableTreeMap> contents,
                                  JImmutableList emptyList)
    {
        this(contents, contents.getComparator(), emptyList);
    }

    private JImmutableTreeListMap(JImmutableMap> contents,
                                  Comparator comparator,
                                  JImmutableList emptyList)
    {
        super(contents, emptyList);
        this.comparator = comparator;
    }

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

    /**
     * Constructs an empty list 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  JImmutableTreeListMap of(Comparator comparator)
    {
        return new JImmutableTreeListMap<>(JImmutableTreeMap.of(comparator), JImmutableTreeList.of());
    }

    public Comparator getComparator()
    {
        return comparator;
    }

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

    @Override
    protected JImmutableListMap create(JImmutableMap> map)
    {
        return (map == contents) ? this : new JImmutableTreeListMap<>(map, comparator, emptyList);
    }

    JImmutableMap> getMap()
    {
        return contents;
    }

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