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/*
 * Licensed to ElasticSearch and Shay Banon 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.rest.action.get;

import org.elasticsearch.action.ActionListener;
import org.elasticsearch.action.get.MultiGetRequest;
import org.elasticsearch.action.get.MultiGetResponse;
import org.elasticsearch.client.Client;
import org.elasticsearch.common.Strings;
import org.elasticsearch.common.inject.Inject;
import org.elasticsearch.common.settings.Settings;
import org.elasticsearch.common.xcontent.XContentBuilder;
import org.elasticsearch.rest.*;

import java.io.IOException;

import static org.elasticsearch.rest.RestRequest.Method.GET;
import static org.elasticsearch.rest.RestRequest.Method.POST;
import static org.elasticsearch.rest.RestStatus.BAD_REQUEST;
import static org.elasticsearch.rest.RestStatus.OK;
import static org.elasticsearch.rest.action.support.RestXContentBuilder.restContentBuilder;

public class RestMultiGetAction extends BaseRestHandler {

    @Inject
    public RestMultiGetAction(Settings settings, Client client, RestController controller) {
        super(settings, client);
        controller.registerHandler(GET, "/_mget", this);
        controller.registerHandler(POST, "/_mget", this);
        controller.registerHandler(GET, "/{index}/_mget", this);
        controller.registerHandler(POST, "/{index}/_mget", this);
        controller.registerHandler(GET, "/{index}/{type}/_mget", this);
        controller.registerHandler(POST, "/{index}/{type}/_mget", this);
    }

    @Override
    public void handleRequest(final RestRequest request, final RestChannel channel) {
        MultiGetRequest multiGetRequest = new MultiGetRequest();
        multiGetRequest.listenerThreaded(false);
        multiGetRequest.refresh(request.paramAsBoolean("refresh", multiGetRequest.refresh()));
        multiGetRequest.preference(request.param("preference"));
        multiGetRequest.realtime(request.paramAsBooleanOptional("realtime", null));

        String[] sFields = null;
        String sField = request.param("fields");
        if (sField != null) {
            sFields = Strings.splitStringByCommaToArray(sField);
        }

        try {
            multiGetRequest.add(request.param("index"), request.param("type"), sFields, request.content());
        } catch (Exception e) {
            try {
                XContentBuilder builder = restContentBuilder(request);
                channel.sendResponse(new XContentRestResponse(request, BAD_REQUEST, builder.startObject().field("error", e.getMessage()).endObject()));
            } catch (IOException e1) {
                logger.error("Failed to send failure response", e1);
            }
            return;
        }

        client.multiGet(multiGetRequest, new ActionListener() {
            @Override
            public void onResponse(MultiGetResponse response) {
                try {
                    XContentBuilder builder = restContentBuilder(request);
                    response.toXContent(builder, request);
                    channel.sendResponse(new XContentRestResponse(request, OK, builder));
                } catch (Exception e) {
                    onFailure(e);
                }
            }

            @Override
            public void onFailure(Throwable e) {
                try {
                    channel.sendResponse(new XContentThrowableRestResponse(request, e));
                } catch (IOException e1) {
                    logger.error("Failed to send failure response", e1);
                }
            }
        });
    }
}