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/*
 * Copyright (c) "Neo4j"
 * Neo4j Sweden AB [http://neo4j.com]
 *
 * This file is part of Neo4j.
 *
 * Neo4j is free software: you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation, either version 3 of the License, or
 * (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program.  If not, see .
 */
package org.neo4j.server.http.cypher.entity;

import org.apache.commons.lang3.NotImplementedException;

import java.util.Iterator;
import java.util.List;

import org.neo4j.graphdb.Entity;
import org.neo4j.graphdb.Node;
import org.neo4j.graphdb.Path;
import org.neo4j.graphdb.Relationship;

public class HttpPath implements Path
{
    private final List relationships;
    private final List nodes;

    public HttpPath( List nodes, List relationships )
    {
        this.relationships = relationships;
        this.nodes = nodes;
    }

    @Override
    public Node startNode()
    {
        return nodes.get( 0 );
    }

    @Override
    public Node endNode()
    {
        return nodes.get( nodes.size() - 1 );
    }

    @Override
    public Relationship lastRelationship()
    {
        return relationships.get( relationships.size() - 1 );
    }

    @Override
    public Iterable relationships()
    {
        return relationships;
    }

    @Override
    public Iterable reverseRelationships()
    {
        throw new NotImplementedException( "HttpPath cannot reverse relationships" );
    }

    @Override
    public Iterable nodes()
    {
        return nodes;
    }

    @Override
    public Iterable reverseNodes()
    {
        throw new NotImplementedException( "HttpPath cannot reverse nodes" );
    }

    @Override
    public int length()
    {
        return relationships.size();
    }

    @Override
    public Iterator iterator()
    {
        return new Iterator<>()
        {
            Iterator current = nodes().iterator();
            Iterator next = relationships().iterator();

            @Override
            public boolean hasNext()
            {
                return current.hasNext();
            }

            @Override
            public Entity next()
            {
                try
                {
                    return current.next();
                }
                finally
                {
                    Iterator temp = current;
                    current = next;
                    next = temp;
                }
            }

            @Override
            public void remove()
            {
                next.remove();
            }
        };
    }
}