/*
 * 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 <http://www.gnu.org/licenses/>.
 */
package org.neo4j.test.mockito.mock;

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

public class Link {
    public static Link link(Relationship relationship, Node node) {
        if (relationship.getStartNodeId() == node.getId()) {
            return new Link(node, relationship);
        }
        if (relationship.getEndNodeId() == node.getId()) {
            return new Link(relationship, node);
        }
        throw illegalArgument("%s is neither the start node nor the end node of %s", node, relationship);
    }

    final Relationship relationship;
    private final Node node;
    private final boolean isStartNode;

    private Link(Node node, Relationship relationship) {
        this.relationship = relationship;
        this.node = node;
        this.isStartNode = true;
    }

    private Link(Relationship relationship, Node node) {
        this.relationship = relationship;
        this.node = node;
        this.isStartNode = false;
    }

    public Node checkNode(Node node) {
        if (isStartNode) {
            if (node.getId() != relationship.getEndNodeId()) {
                throw illegalArgument("%s is not the end node of %s", node, relationship);
            }
        } else {
            if (node.getId() != relationship.getStartNodeId()) {
                throw illegalArgument("%s is not the start node of %s", node, relationship);
            }
        }
        return this.node;
    }

    private static IllegalArgumentException illegalArgument(String message, Object... parameters) {
        return new IllegalArgumentException(String.format(message, parameters));
    }
}
