/**
 * This file is part of Graylog.
 *
 * Graylog 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.
 *
 * Graylog 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 Graylog.  If not, see <http://www.gnu.org/licenses/>.
 */
package org.graylog2.rest.resources;

import com.codahale.metrics.annotation.Timed;
import io.swagger.annotations.Api;
import io.swagger.annotations.ApiOperation;
import org.graylog2.Configuration;
import org.graylog2.plugin.Version;
import org.graylog2.plugin.cluster.ClusterConfigService;
import org.graylog2.plugin.cluster.ClusterId;
import org.graylog2.plugin.system.NodeId;
import org.graylog2.rest.models.HelloWorldResponse;
import org.graylog2.shared.rest.resources.RestResource;

import javax.inject.Inject;
import javax.ws.rs.GET;
import javax.ws.rs.Path;
import javax.ws.rs.Produces;
import javax.ws.rs.core.MediaType;
import javax.ws.rs.core.Response;
import java.net.URI;

import static java.util.Objects.requireNonNull;

@Api(value = "Hello World", description = "A friendly hello world message")
@Path("/")
public class HelloWorldResource extends RestResource {
    private final NodeId nodeId;
    private final ClusterConfigService clusterConfigService;
    private final Configuration configuration;

    @Inject
    public HelloWorldResource(NodeId nodeId,
                              ClusterConfigService clusterConfigService,
                              Configuration configuration) {
        this.nodeId = requireNonNull(nodeId);
        this.clusterConfigService = requireNonNull(clusterConfigService);
        this.configuration = configuration;
    }

    @GET
    @Timed
    @ApiOperation(value = "A few details about the Graylog node.")
    @Produces(MediaType.APPLICATION_JSON)
    public HelloWorldResponse helloWorld() {
        final ClusterId clusterId = clusterConfigService.getOrDefault(ClusterId.class, ClusterId.create("UNKNOWN"));
        return HelloWorldResponse.create(
            clusterId.clusterId(),
            nodeId.toString(),
            Version.CURRENT_CLASSPATH.toString(),
            "Manage your logs in the dark and have lasers going and make it look like you're from space!"
        );
    }

    @GET
    @Timed
    @ApiOperation(value = "Redirecting to web console if it runs on same port.")
    @Produces({MediaType.TEXT_HTML, MediaType.APPLICATION_XHTML_XML})
    public Response redirectToWebConsole() {
        if (configuration.isRestAndWebOnSamePort()) {
            final URI target = URI.create(configuration.getWebPrefix());
            return Response
                .temporaryRedirect(target)
                .build();
        }

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