/*
 * Licensed to Elasticsearch under one or more contributor
 * license agreements. See the NOTICE file distributed with
 * this work for additional information regarding copyright
 * ownership. Elasticsearch 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.elasticsearch.index.reindex;

import org.elasticsearch.action.admin.cluster.node.tasks.list.ListTasksResponse;
import org.elasticsearch.client.Client;
import org.elasticsearch.common.inject.Inject;
import org.elasticsearch.common.settings.Settings;
import org.elasticsearch.rest.BaseRestHandler;
import org.elasticsearch.rest.RestChannel;
import org.elasticsearch.rest.RestController;
import org.elasticsearch.rest.RestRequest;
import org.elasticsearch.rest.action.support.RestToXContentListener;
import org.elasticsearch.tasks.TaskId;

import static org.elasticsearch.rest.RestRequest.Method.POST;

public class RestRethrottleAction extends BaseRestHandler {
    private final TransportRethrottleAction action;

    @Inject
    public RestRethrottleAction(Settings settings, RestController controller, Client client, TransportRethrottleAction action) {
        super(settings, controller, client);
        this.action = action;
        controller.registerHandler(POST, "/_update_by_query/{taskId}/_rethrottle", this);
        controller.registerHandler(POST, "/_reindex/{taskId}/_rethrottle", this);
    }

    @Override
    public void handleRequest(final RestRequest request, final RestChannel channel, final Client client) {
        RethrottleRequest internalRequest = new RethrottleRequest();
        internalRequest.setTaskId(new TaskId(request.param("taskId")));
        Float requestsPerSecond = AbstractBaseReindexRestHandler.parseRequestsPerSecond(request);
        if (requestsPerSecond == null) {
            throw new IllegalArgumentException("requests_per_second is a required parameter");
        }
        internalRequest.setRequestsPerSecond(requestsPerSecond);
        action.execute(internalRequest, new RestToXContentListener<ListTasksResponse>(channel));
    }
}