/*
 * 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.server.rest.repr;

import static org.neo4j.internal.helpers.collection.MapUtil.map;

import org.neo4j.graphdb.Relationship;
import org.neo4j.server.http.cypher.entity.HttpRelationship;

public final class RelationshipRepresentation extends ObjectRepresentation
        implements ExtensibleRepresentation, EntityRepresentation {
    private final Relationship rel;

    public RelationshipRepresentation(Relationship rel) {
        super(RepresentationType.RELATIONSHIP);
        this.rel = rel;
    }

    @Override
    public String getIdentity() {
        return Long.toString(rel.getId());
    }

    public long getId() {
        return rel.getId();
    }

    @Override
    @Mapping("self")
    public ValueRepresentation selfUri() {
        return ValueRepresentation.uri(path(""));
    }

    private String path(String path) {
        return "relationship/" + rel.getId() + path;
    }

    static String path(Relationship rel) {
        return "relationship/" + rel.getId();
    }

    @Mapping("type")
    public ValueRepresentation getType() {
        return ValueRepresentation.relationshipType(rel.getType());
    }

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

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

    @Mapping("properties")
    public ValueRepresentation propertiesUri() {
        return ValueRepresentation.uri(path("/properties"));
    }

    @Mapping("property")
    public ValueRepresentation propertyUriTemplate() {
        return ValueRepresentation.template(path("/properties/{key}"));
    }

    @Mapping("metadata")
    public MapRepresentation metadata() {
        if (isDeleted()) {
            return new MapRepresentation(
                    map("id", rel.getId(), "elementId", rel.getElementId(), "deleted", Boolean.TRUE));
        } else {
            return new MapRepresentation(map(
                    "id",
                    rel.getId(),
                    "elementId",
                    rel.getElementId(),
                    "type",
                    rel.getType().name()));
        }
    }

    private boolean isDeleted() {
        return ((HttpRelationship) rel).isDeleted();
    }

    @Override
    public void extraData(MappingSerializer serializer) {
        if (!isDeleted()) {
            MappingWriter properties = serializer.writer.newMapping(RepresentationType.PROPERTIES, "data");
            new PropertiesRepresentation(rel).serialize(properties);
            properties.done();
        }
    }
}
