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package org.javimmutable.collections.common;

import org.javimmutable.collections.Proc1;
import org.javimmutable.collections.Proc1Throws;
import org.javimmutable.collections.SplitableIterable;
import org.javimmutable.collections.SplitableIterator;
import org.javimmutable.collections.Sum1;
import org.javimmutable.collections.Sum1Throws;
import org.javimmutable.collections.iterators.GenericIterator;

import javax.annotation.Nonnull;
import javax.annotation.Nullable;

/**
 * Interface for simple collection objects that manage the contents of leaf nodes in the hash table.
 * Implementations are free to use any class for their leaf nodes and manage them as needed.
 */
public interface CollisionSet
{
    interface Node
    {
    }

    @Nonnull
    Node empty();

    @Nonnull
    Node single(@Nonnull T value);

    int size(@Nonnull Node node);

    boolean contains(@Nonnull Node node,
                     @Nonnull T value);

    @Nonnull
    Node insert(@Nonnull Node node,
                @Nonnull T value);

    @Nonnull
    Node delete(@Nonnull Node node,
                @Nonnull T value);

    @Nullable
    GenericIterator.State iterateOverRange(@Nonnull Node node,
                                              @Nullable GenericIterator.State parent,
                                              int offset,
                                              int limit);

    @Nonnull
    default GenericIterator.Iterable genericIterable(@Nonnull Node node)
    {
        return new GenericIterator.Iterable()
        {
            @Nullable
            @Override
            public GenericIterator.State iterateOverRange(@Nullable GenericIterator.State parent,
                                                             int offset,
                                                             int limit)
            {
                return CollisionSet.this.iterateOverRange(node, parent, offset, limit);
            }

            @Override
            public int iterableSize()
            {
                return size(node);
            }
        };
    }

    @Nonnull
    default SplitableIterable iterable(@Nonnull CollisionSet.Node node)
    {
        return genericIterable(node);
    }

    @Nonnull
    default SplitableIterator iterator(@Nonnull Node node)
    {
        return genericIterable(node).iterator();
    }

    void forEach(@Nonnull Node node,
                 @Nonnull Proc1 proc);

     void forEachThrows(@Nonnull Node node,
                                             @Nonnull Proc1Throws proc)
        throws E;

     R reduce(@Nonnull Node node,
                 R sum,
                 @Nonnull Sum1 proc);

     R reduceThrows(@Nonnull Node node,
                                            R sum,
                                            @Nonnull Sum1Throws proc)
        throws E;
}