/*
 * SPDX-License-Identifier: Apache-2.0
 *
 * The OpenSearch Contributors require contributions made to
 * this file be licensed under the Apache-2.0 license or a
 * compatible open source license.
 */

/*
 * 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.
 */

/*
 * Modifications Copyright OpenSearch Contributors. See
 * GitHub history for details.
 */

package org.opensearch.rest.action;

import org.opensearch.action.main.MainAction;
import org.opensearch.action.main.MainRequest;
import org.opensearch.action.main.MainResponse;
import org.opensearch.client.node.NodeClient;
import org.opensearch.core.xcontent.XContentBuilder;
import org.opensearch.rest.BaseRestHandler;
import org.opensearch.rest.BytesRestResponse;
import org.opensearch.rest.RestRequest;
import org.opensearch.rest.RestResponse;
import org.opensearch.core.rest.RestStatus;

import java.io.IOException;
import java.util.List;

import static java.util.Arrays.asList;
import static java.util.Collections.unmodifiableList;
import static org.opensearch.rest.RestRequest.Method.GET;
import static org.opensearch.rest.RestRequest.Method.HEAD;

/**
 * Main OpenSearch Transport action
 *
 * @opensearch.api
 */
public class RestMainAction extends BaseRestHandler {

    @Override
    public List<Route> routes() {
        return unmodifiableList(asList(new Route(GET, "/"), new Route(HEAD, "/")));
    }

    @Override
    public String getName() {
        return "main_action";
    }

    @Override
    public RestChannelConsumer prepareRequest(final RestRequest request, final NodeClient client) throws IOException {
        return channel -> client.execute(MainAction.INSTANCE, new MainRequest(), new RestBuilderListener<MainResponse>(channel) {
            @Override
            public RestResponse buildResponse(MainResponse mainResponse, XContentBuilder builder) throws Exception {
                return convertMainResponse(mainResponse, request, builder);
            }
        });
    }

    static BytesRestResponse convertMainResponse(MainResponse response, RestRequest request, XContentBuilder builder) throws IOException {
        // Default to pretty printing, but allow ?pretty=false to disable
        if (request.hasParam("pretty") == false) {
            builder.prettyPrint().lfAtEnd();
        }
        response.toXContent(builder, request);
        return new BytesRestResponse(RestStatus.OK, builder);
    }

    @Override
    public boolean canTripCircuitBreaker() {
        return false;
    }
}