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/*
 * Copyright (C) 2020 Graylog, Inc.
 *
 * This program is free software: you can redistribute it and/or modify
 * it under the terms of the Server Side Public License, version 1,
 * as published by MongoDB, Inc.
 *
 * 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
 * Server Side Public License for more details.
 *
 * You should have received a copy of the Server Side Public License
 * along with this program. If not, see
 * .
 */
package org.graylog2.rest.resources.system.indexer;

import com.codahale.metrics.annotation.Timed;
import io.swagger.annotations.Api;
import io.swagger.annotations.ApiOperation;
import org.apache.shiro.authz.annotation.RequiresAuthentication;
import org.apache.shiro.authz.annotation.RequiresPermissions;
import org.graylog2.indexer.cluster.Cluster;
import org.graylog2.rest.models.system.indexer.responses.ClusterHealth;
import org.graylog2.rest.models.system.indexer.responses.ClusterName;
import org.graylog2.shared.rest.resources.RestResource;
import org.graylog2.shared.security.RestPermissions;

import javax.inject.Inject;
import javax.ws.rs.GET;
import javax.ws.rs.InternalServerErrorException;
import javax.ws.rs.Path;
import javax.ws.rs.Produces;
import javax.ws.rs.core.MediaType;

@RequiresAuthentication
@Api(value = "Indexer/Cluster", description = "Indexer cluster information")
@Path("/system/indexer/cluster")
public class IndexerClusterResource extends RestResource {

    @Inject
    private Cluster cluster;

    @GET
    @Timed
    @Path("/name")
    @RequiresPermissions(RestPermissions.INDEXERCLUSTER_READ)
    @ApiOperation(value = "Get the cluster name")
    @Produces(MediaType.APPLICATION_JSON)
    public ClusterName clusterName() {
        final String clusterName = cluster.clusterName()
                .orElseThrow(() -> new InternalServerErrorException("Couldn't read Elasticsearch cluster health"));
        return ClusterName.create(clusterName);
    }

    @GET
    @Timed
    @Path("/health")
    @ApiOperation(value = "Get cluster and shard health overview")
    @RequiresPermissions(RestPermissions.INDEXERCLUSTER_READ)
    @Produces(MediaType.APPLICATION_JSON)
    public ClusterHealth clusterHealth() {
        return cluster.clusterHealthStats()
                .orElseThrow(() -> new InternalServerErrorException("Couldn't read Elasticsearch cluster health"));
    }
}