/*
 * 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.client.benchmark.rest;

import org.apache.http.HttpEntity;
import org.apache.http.HttpHeaders;
import org.apache.http.HttpHost;
import org.apache.http.HttpStatus;
import org.apache.http.client.config.RequestConfig;
import org.apache.http.conn.ConnectionKeepAliveStrategy;
import org.apache.http.entity.ContentType;
import org.apache.http.entity.StringEntity;
import org.apache.http.impl.nio.client.HttpAsyncClientBuilder;
import org.apache.http.message.BasicHeader;
import org.apache.http.nio.entity.NStringEntity;
import org.elasticsearch.ElasticsearchException;
import org.elasticsearch.client.Response;
import org.elasticsearch.client.RestClient;
import org.elasticsearch.client.RestClientBuilder;
import org.elasticsearch.client.benchmark.AbstractBenchmark;
import org.elasticsearch.client.benchmark.ops.bulk.BulkRequestExecutor;
import org.elasticsearch.client.benchmark.ops.search.SearchRequestExecutor;

import java.io.IOException;
import java.nio.charset.StandardCharsets;
import java.util.Collections;
import java.util.List;
import java.util.Locale;

public final class RestClientBenchmark extends AbstractBenchmark<RestClient> {
    public static void main(String[] args) throws Exception {
        RestClientBenchmark b = new RestClientBenchmark();
        b.run(args);
    }

    @Override
    protected RestClient client(String benchmarkTargetHost) {
        return RestClient
            .builder(new HttpHost(benchmarkTargetHost, 9200))
            .setHttpClientConfigCallback(b -> b.setDefaultHeaders(
                Collections.singleton(new BasicHeader(HttpHeaders.ACCEPT_ENCODING, "gzip"))))
            .setRequestConfigCallback(b -> b.setContentCompressionEnabled(true))
            .build();
    }

    @Override
    protected BulkRequestExecutor bulkRequestExecutor(RestClient client, String indexName, String typeName) {
        return new RestBulkRequestExecutor(client, indexName, typeName);
    }

    @Override
    protected SearchRequestExecutor searchRequestExecutor(RestClient client, String indexName) {
        return new RestSearchRequestExecutor(client, indexName);
    }

    private static final class RestBulkRequestExecutor implements BulkRequestExecutor {
        private final RestClient client;
        private final String actionMetaData;

        RestBulkRequestExecutor(RestClient client, String index, String type) {
            this.client = client;
            this.actionMetaData = String.format(Locale.ROOT, "{ \"index\" : { \"_index\" : \"%s\", \"_type\" : \"%s\" } }%n", index, type);
        }

        @Override
        public boolean bulkIndex(List<String> bulkData) {
            StringBuilder bulkRequestBody = new StringBuilder();
            for (String bulkItem : bulkData) {
                bulkRequestBody.append(actionMetaData);
                bulkRequestBody.append(bulkItem);
                bulkRequestBody.append("\n");
            }
            HttpEntity entity = new NStringEntity(bulkRequestBody.toString(), ContentType.APPLICATION_JSON);
            try {
                Response response = client.performRequest("POST", "/geonames/type/_noop_bulk", Collections.emptyMap(), entity);
                return response.getStatusLine().getStatusCode() == HttpStatus.SC_OK;
            } catch (Exception e) {
                throw new ElasticsearchException(e);
            }
        }
    }

    private static final class RestSearchRequestExecutor implements SearchRequestExecutor {
        private final RestClient client;
        private final String endpoint;

        private RestSearchRequestExecutor(RestClient client, String indexName) {
            this.client = client;
            this.endpoint = "/" + indexName + "/_noop_search";
        }

        @Override
        public boolean search(String source) {
            HttpEntity searchBody = new NStringEntity(source, StandardCharsets.UTF_8);
            try {
                Response response = client.performRequest("GET", endpoint, Collections.emptyMap(), searchBody);
                return response.getStatusLine().getStatusCode() == HttpStatus.SC_OK;
            } catch (IOException e) {
                throw new ElasticsearchException(e);
            }
        }
    }
}