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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.rest.repr;

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

import org.neo4j.graphdb.Node;
import org.neo4j.graphdb.Path;
import org.neo4j.graphdb.Relationship;
import org.neo4j.internal.helpers.collection.IterableWrapper;

public class PathRepresentation extends ObjectRepresentation // implements
                                                                             // ExtensibleRepresentation
{
    private final P path;

    public PathRepresentation( P path )
    {
        super( RepresentationType.PATH );
        this.path = path;
    }

    protected P getPath()
    {
        return path;
    }

    @Mapping( "start" )
    public ValueRepresentation startNode()
    {
        return ValueRepresentation.uri( NodeRepresentation.path( path.startNode() ) );
    }

    @Mapping( "end" )
    public ValueRepresentation endNode()
    {
        return ValueRepresentation.uri( NodeRepresentation.path( path.endNode() ) );
    }

    @Mapping( "length" )
    public ValueRepresentation length()
    {
        return ValueRepresentation.number( path.length() );
    }

    @Mapping( "nodes" )
    public ListRepresentation nodes()
    {
        return new ListRepresentation( RepresentationType.NODE,
                                       new IterableWrapper<>( path.nodes() )
                                       {
                                           @Override
                                           protected Representation underlyingObjectToObject( Node node )
                                           {
                                               return ValueRepresentation.uri( NodeRepresentation.path( node ) );
                                           }
                                       } );
    }

    @Mapping( "relationships" )
    public ListRepresentation relationships()
    {
        return new ListRepresentation( RepresentationType.RELATIONSHIP,
                                       new IterableWrapper<>( path.relationships() )
                                       {
                                           @Override
                                           protected Representation underlyingObjectToObject( Relationship node )
                                           {
                                               return ValueRepresentation.uri( RelationshipRepresentation.path( node ) );
                                           }
                                       } );
    }

    @Mapping( "directions" )
    public ListRepresentation directions()
    {
        List directionStrings = new ArrayList<>();

        Iterator nodeIterator = path.nodes().iterator();
        Iterator relationshipIterator = path.relationships().iterator();

        Relationship rel;
        Node startNode;
        Node endNode = nodeIterator.next();

        while ( relationshipIterator.hasNext() )
        {
            rel = relationshipIterator.next();
            startNode = endNode;
            endNode = nodeIterator.next();
            if ( rel.getStartNodeId() == startNode.getId() && rel.getEndNodeId() == endNode.getId() )
            {
                directionStrings.add( "->" );
            }
            else
            {
                directionStrings.add( "<-" );
            }
        }

        return new ListRepresentation( RepresentationType.STRING,
                                       new IterableWrapper<>( directionStrings )
                                       {
                                           @Override
                                           protected Representation underlyingObjectToObject( String directionString )
                                           {
                                               return ValueRepresentation.string( directionString );
                                           }
                                       } );
    }
}