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/*
 * Licensed to Neo Technology under one or more contributor
 * license agreements. See the NOTICE file distributed with
 * this work for additional information regarding copyright
 * ownership. Neo Technology licenses this file to you under
 * the Apache License, Version 2.0 (the "License"); you may
 * not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 * http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing,
 * software distributed under the License is distributed on an
 * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
 * KIND, either express or implied. See the License for the
 * specific language governing permissions and limitations
 * under the License.
 */
package org.neo4j.examples.server.unmanaged;

import java.io.IOException;
import java.io.OutputStream;
import java.util.Map;

import javax.ws.rs.GET;
import javax.ws.rs.Path;
import javax.ws.rs.PathParam;
import javax.ws.rs.WebApplicationException;
import javax.ws.rs.core.Context;
import javax.ws.rs.core.MediaType;
import javax.ws.rs.core.Response;
import javax.ws.rs.core.StreamingOutput;

import org.codehaus.jackson.JsonEncoding;
import org.codehaus.jackson.JsonGenerator;
import org.codehaus.jackson.map.ObjectMapper;

import org.neo4j.graphdb.GraphDatabaseService;
import org.neo4j.graphdb.Node;
import org.neo4j.graphdb.Result;
import org.neo4j.graphdb.Transaction;
import org.neo4j.helpers.collection.MapUtil;

//START SNIPPET: ColleaguesCypherExecutionResource
@Path("/colleagues-cypher-execution")
public class ColleaguesCypherExecutionResource
{
    private final ObjectMapper objectMapper;
    private GraphDatabaseService graphDb;

    public ColleaguesCypherExecutionResource( @Context GraphDatabaseService graphDb )
    {
        this.graphDb = graphDb;
        this.objectMapper = new ObjectMapper();
    }

    @GET
    @Path("/{personName}")
    public Response findColleagues( final @PathParam("personName") String personName )
    {
        final Map params = MapUtil.map( "personName", personName );

        StreamingOutput stream = new StreamingOutput()
        {
            @Override
            public void write( OutputStream os ) throws IOException, WebApplicationException
            {
                JsonGenerator jg = objectMapper.getJsonFactory().createJsonGenerator( os, JsonEncoding.UTF8 );
                jg.writeStartObject();
                jg.writeFieldName( "colleagues" );
                jg.writeStartArray();

                try ( Transaction tx = graphDb.beginTx();
                      Result result = graphDb.execute( colleaguesQuery(), params ) )
                {
                    while ( result.hasNext() )
                    {
                        Map row = result.next();
                        jg.writeString( ((Node) row.get( "colleague" )).getProperty( "name" ).toString() );
                    }
                    tx.success();
                }

                jg.writeEndArray();
                jg.writeEndObject();
                jg.flush();
                jg.close();
            }
        };

        return Response.ok().entity( stream ).type( MediaType.APPLICATION_JSON ).build();
    }

    private String colleaguesQuery()
    {
        return "MATCH (p:Person {name: {personName} })-[:ACTED_IN]->()<-[:ACTED_IN]-(colleague) RETURN colleague";
    }
}
// END SNIPPET: ColleaguesCypherExecutionResource