/*
 * ====================================================================
 * Licensed to the Apache Software Foundation (ASF) under one
 * or more contributor license agreements.  See the NOTICE file
 * distributed with this work for additional information
 * regarding copyright ownership.  The ASF 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.
 * ====================================================================
 *
 * This software consists of voluntary contributions made by many
 * individuals on behalf of the Apache Software Foundation.  For more
 * information on the Apache Software Foundation, please see
 * <http://www.apache.org/>.
 *
 */
package org.apache.http.benchmark;

import java.io.UnsupportedEncodingException;
import java.net.URL;

import org.apache.commons.cli.CommandLine;
import org.apache.commons.cli.CommandLineParser;
import org.apache.commons.cli.Options;
import org.apache.commons.cli.PosixParser;
import org.apache.http.Header;
import org.apache.http.HttpHost;
import org.apache.http.HttpRequest;
import org.apache.http.HttpVersion;
import org.apache.http.entity.FileEntity;
import org.apache.http.message.BasicHttpEntityEnclosingRequest;
import org.apache.http.message.BasicHttpRequest;
import org.apache.http.params.BasicHttpParams;
import org.apache.http.params.HttpConnectionParams;
import org.apache.http.params.HttpParams;
import org.apache.http.params.HttpProtocolParams;
import org.apache.http.protocol.HTTP;

import java.util.concurrent.LinkedBlockingQueue;
import java.util.concurrent.ThreadFactory;
import java.util.concurrent.ThreadPoolExecutor;
import java.util.concurrent.TimeUnit;
import org.apache.http.HttpEntity;
import org.apache.http.entity.StringEntity;

/**
 * Main program of the HTTP benchmark.
 *
 *
 * @since 4.0
 */
public class HttpBenchmark {

    private final Config config;

    private HttpParams params = null;
    private HttpRequest[] request = null;
    private HttpHost host = null;
    private long contentLength = -1;

    public static void main(String[] args) throws Exception {

        Options options = CommandLineUtils.getOptions();
        CommandLineParser parser = new PosixParser();
        CommandLine cmd = parser.parse(options, args);

        if (args.length == 0 || cmd.hasOption('h') || cmd.getArgs().length != 1) {
            CommandLineUtils.showUsage(options);
            System.exit(1);
        }

        Config config = new Config();
        CommandLineUtils.parseCommandLine(cmd, config);

        if (config.getUrl() == null) {
            CommandLineUtils.showUsage(options);
            System.exit(1);
        }

        HttpBenchmark httpBenchmark = new HttpBenchmark(config);
        httpBenchmark.execute();
    }

    public HttpBenchmark(final Config config) {
        super();
        this.config = config != null ? config : new Config();
    }

    private void prepare() throws UnsupportedEncodingException {
        // prepare http params
        params = getHttpParams(config.getSocketTimeout(), config.isUseHttp1_0(), config.isUseExpectContinue());

        URL url = config.getUrl();
        host = new HttpHost(url.getHost(), url.getPort(), url.getProtocol());

        HttpEntity entity = null;

        // Prepare requests for each thread
        if (config.getPayloadFile() != null) {
            entity = new FileEntity(config.getPayloadFile(), config.getContentType());
            ((FileEntity) entity).setChunked(config.isUseChunking());
            contentLength = config.getPayloadFile().length();

        } else if (config.getPayloadText() != null) {
            entity = new StringEntity(config.getPayloadText(), config.getContentType(), "UTF-8");
            ((StringEntity) entity).setChunked(config.isUseChunking());
            contentLength = config.getPayloadText().getBytes().length;
        }
        request = new HttpRequest[config.getThreads()];

        for (int i = 0; i < request.length; i++) {
            if ("POST".equals(config.getMethod())) {
                BasicHttpEntityEnclosingRequest httppost =
                        new BasicHttpEntityEnclosingRequest("POST", url.getPath());
                httppost.setEntity(entity);
                request[i] = httppost;
            } else if ("PUT".equals(config.getMethod())) {
                BasicHttpEntityEnclosingRequest httpput =
                        new BasicHttpEntityEnclosingRequest("PUT", url.getPath());
                httpput.setEntity(entity);
                request[i] = httpput;
            } else {
                String path = url.getPath();
                if (url.getQuery() != null && url.getQuery().length() > 0) {
                    path += "?" + url.getQuery();
                } else if (path.trim().length() == 0) {
                    path = "/";
                }
                request[i] = new BasicHttpRequest(config.getMethod(), path);
            }
        }

        if (!config.isKeepAlive()) {
            for (int i = 0; i < request.length; i++) {
                request[i].addHeader(new DefaultHeader(HTTP.CONN_DIRECTIVE, HTTP.CONN_CLOSE));
            }
        }

        String[] headers = config.getHeaders();
        if (headers != null) {
            for (int i = 0; i < headers.length; i++) {
                String s = headers[i];
                int pos = s.indexOf(':');
                if (pos != -1) {
                    Header header = new DefaultHeader(s.substring(0, pos).trim(), s.substring(pos + 1));
                    for (int j = 0; j < request.length; j++) {
                        request[j].addHeader(header);
                    }
                }
            }
        }

        if (config.isUseAcceptGZip()) {
            for (int i = 0; i < request.length; i++) {
                request[i].addHeader(new DefaultHeader("Accept-Encoding", "gzip"));
            }
        }

        if (config.getSoapAction() != null && config.getSoapAction().length() > 0) {
            for (int i = 0; i < request.length; i++) {
                request[i].addHeader(new DefaultHeader("SOAPAction", config.getSoapAction()));
            }
        }
    }

    public String execute() throws Exception {

        prepare();

        ThreadPoolExecutor workerPool = new ThreadPoolExecutor(
                config.getThreads(), config.getThreads(), 5, TimeUnit.SECONDS,
            new LinkedBlockingQueue<Runnable>(),
            new ThreadFactory() {

                public Thread newThread(Runnable r) {
                    return new Thread(r, "ClientPool");
                }

            });
        workerPool.prestartAllCoreThreads();

        BenchmarkWorker[] workers = new BenchmarkWorker[config.getThreads()];
        for (int i = 0; i < workers.length; i++) {
            workers[i] = new BenchmarkWorker(
                    params,
                    config.getVerbosity(),
                    request[i],
                    host,
                    config.getRequests(),
                    config.isKeepAlive(),
                    config.isDisableSSLVerification(),
                    config.getTrustStorePath(),
                    config.getTrustStorePassword(),
                    config.getIdentityStorePath(),
                    config.getIdentityStorePassword());
            workerPool.execute(workers[i]);
        }

        while (workerPool.getCompletedTaskCount() < config.getThreads()) {
            Thread.yield();
            try {
                Thread.sleep(1000);
            } catch (InterruptedException ignore) {
            }
        }

        workerPool.shutdown();
        return ResultProcessor.printResults(workers, host, config.getUrl().toString(), contentLength);
    }

    private HttpParams getHttpParams(
            int socketTimeout, boolean useHttp1_0, boolean useExpectContinue) {

        HttpParams params = new BasicHttpParams();
        params.setParameter(HttpProtocolParams.PROTOCOL_VERSION,
            useHttp1_0 ? HttpVersion.HTTP_1_0 : HttpVersion.HTTP_1_1)
            .setParameter(HttpProtocolParams.USER_AGENT, "HttpCore-AB/1.1")
            .setBooleanParameter(HttpProtocolParams.USE_EXPECT_CONTINUE, useExpectContinue)
            .setBooleanParameter(HttpConnectionParams.STALE_CONNECTION_CHECK, false)
            .setIntParameter(HttpConnectionParams.SO_TIMEOUT, socketTimeout);
        return params;
    }
}