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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.discovery;

import javax.ws.rs.GET;
import javax.ws.rs.Path;
import javax.ws.rs.Produces;
import javax.ws.rs.core.Context;
import javax.ws.rs.core.MediaType;
import javax.ws.rs.core.Request;
import javax.ws.rs.core.Response;
import javax.ws.rs.core.UriInfo;
import javax.ws.rs.core.Variant;

import org.neo4j.configuration.Config;
import org.neo4j.server.NeoWebServer;
import org.neo4j.server.configuration.ServerSettings;
import org.neo4j.server.rest.repr.DiscoveryRepresentation;
import org.neo4j.server.config.AuthConfigProvider;

/**
 * Used to discover the rest of the server URIs through a HTTP GET request to the server root (/).
 */
@Path( "/" )
public class DiscoveryService
{
    private final Config config;
    private final DiscoverableURIs uris;
    private final ServerVersionAndEdition serverInfo;
    private final AuthConfigProvider authConfigProvider;

    // Your IDE might tell you to make this less visible than public. Don't. JAX-RS demands is to be public.
    public DiscoveryService( @Context Config config, @Context DiscoverableURIs uris, @Context NeoWebServer neoWebServer,
                             @Context AuthConfigProvider authConfigProvider )
    {
        this( config, uris, new ServerVersionAndEdition( neoWebServer ), authConfigProvider );
    }

    // Used in internal unit test to avoid providing a neo server
    DiscoveryService( Config config, DiscoverableURIs uris, ServerVersionAndEdition serverInfo,
                      AuthConfigProvider authConfigProvider )
    {
        this.config = config;
        this.uris = uris;
        this.serverInfo = serverInfo;
        this.authConfigProvider = authConfigProvider;
    }

    @GET
    @Produces( MediaType.WILDCARD )
    public Response get( @Context Request request, @Context UriInfo uriInfo )
    {

        Variant v = request.selectVariant( Variant.mediaTypes( MediaType.APPLICATION_JSON_TYPE, MediaType.TEXT_HTML_TYPE ).build() );
        Response.ResponseBuilder responseBuilder;
        if ( v == null )
        {
            responseBuilder = Response.serverError().status( Response.Status.NOT_ACCEPTABLE );
        }
        else if ( v.getMediaType() == MediaType.APPLICATION_JSON_TYPE )
        {
            responseBuilder = Response.ok()
                                      .entity( new DiscoveryRepresentation( uris.update( uriInfo.getBaseUri() ), serverInfo,
                                                                            authConfigProvider.getRepresentation() ) )
                                      .variant( v );
        }
        else
        {
            responseBuilder = Response.seeOther( uriInfo.getBaseUri().resolve( config.get( ServerSettings.browser_path ) ) )
                                      .variant( v );
        }

        return responseBuilder.build();
    }
}