/*
 * Copyright (c) 1997, 2018 Oracle and/or its affiliates. All rights reserved.
 *
 * This program and the accompanying materials are made available under the
 * terms of the Eclipse Public License v. 2.0, which is available at
 * http://www.eclipse.org/legal/epl-2.0.
 *
 * This Source Code may also be made available under the following Secondary
 * Licenses when the conditions for such availability set forth in the
 * Eclipse Public License v. 2.0 are satisfied: GNU General Public License,
 * version 2 with the GNU Classpath Exception, which is available at
 * https://www.gnu.org/software/classpath/license.html.
 *
 * SPDX-License-Identifier: EPL-2.0 OR GPL-2.0 WITH Classpath-exception-2.0
 */

import java.io.BufferedReader;
import java.io.BufferedWriter;
import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.io.OutputStream;
import java.io.OutputStreamWriter;
import java.net.HttpURLConnection;
import java.net.URL;
import java.net.URLEncoder;
import java.util.ArrayList;
import java.util.List;
import java.util.concurrent.Callable;
import java.util.concurrent.CountDownLatch;
import java.util.concurrent.ExecutorService;
import java.util.concurrent.Executors;
import java.util.concurrent.Future;
import java.util.concurrent.TimeUnit;

import com.sun.appserv.test.util.results.SimpleReporterAdapter;

/*
 * Unit test for comet: echo.
 */
public class WebTest {

    private static final String TEST_NAME = "comet-echo";

    private static final SimpleReporterAdapter stat = new SimpleReporterAdapter("appserv-tests", TEST_NAME);

    private String host;
    private String port;
    private String contextRoot;

    public WebTest(String[] args) {
        host = args[0];
        port = args[1];
        contextRoot = args[2];
    }

    public static void main(String[] args) {

        stat.addDescription("Unit test for comet: echo");
        WebTest webTest = new WebTest(args);
        webTest.run();

    }

    public void run() {
        try {
            String urlStr = "http://" + host + ":" + port + contextRoot + "/echo";
            int numOfClients = 10;
            CountDownLatch startSignal = new CountDownLatch(numOfClients);
            CountDownLatch endSignal = new CountDownLatch(numOfClients);
            ExecutorService executorService = Executors.newFixedThreadPool(numOfClients);
            List<Future<String>> futures = new ArrayList<Future<String>>();

            for (int i = 0; i < numOfClients; i++) {
                futures.add(executorService.submit(
                        new Worker(urlStr, startSignal, endSignal)));
            }

            System.out.println("Wait to start ...");
            boolean ss = startSignal.await(numOfClients * 2000, TimeUnit.MILLISECONDS);
            System.out.println(ss);

            String message = "abc";
            System.out.println("Sending message: " + message);
            writeMessage(urlStr, message);

            System.out.println("Wait to end ...");
            boolean es = endSignal.await(numOfClients * 1000, TimeUnit.MILLISECONDS);
            System.out.println(es);
            boolean valid = true;
            for (Future<String> future : futures) {
                String returnedMessage = future.get(1000, TimeUnit.MILLISECONDS);
                System.out.println("Got message : " + returnedMessage);
                valid = valid && (message.equals(returnedMessage));
            }
            executorService.shutdown();

            stat.addStatus(TEST_NAME, ((valid)? stat.PASS : stat.FAIL));
        } catch (Exception ex) {
            ex.printStackTrace();
            stat.addStatus(TEST_NAME, stat.FAIL);
        }

        stat.printSummary();
    }

    private void writeMessage(String urlStr, String message) throws Exception {
        OutputStream os = null;
        BufferedWriter bw = null;
        String line = null;

        try{
            URL url = new URL(urlStr);
            String data = "msg=" + URLEncoder.encode(message);
            HttpURLConnection urlConnection =  (HttpURLConnection)url.openConnection();
            urlConnection.setRequestMethod("POST");
            urlConnection.setRequestProperty("Content-Type", "application/x-www-form-urlencoded");
            urlConnection.setDoOutput(true);
            urlConnection.connect();

            os = urlConnection.getOutputStream();
            bw = new BufferedWriter(new OutputStreamWriter(os));
            bw.write(data);
            bw.flush();

            int statusCode = urlConnection.getResponseCode();
            if (HttpURLConnection.HTTP_OK != statusCode) {
                throw new IllegalStateException("Incorrect return code: " + statusCode);
            }
        } finally {
            try {
                if (os != null) {
                    os.close();
                }
            } catch(IOException ioe) {
                // ignore
            }
            try {
                if (bw != null) {
                    bw.close();
                }
            } catch(IOException ioe) {
                // ignore
            }
        }
    }

    private static class Worker implements Callable<String> {
        private String urlStr;
        private CountDownLatch startSignal;
        private CountDownLatch endSignal;

        public Worker(String urlStr, CountDownLatch startSignal,
                CountDownLatch endSignal) throws Exception {

            this.urlStr = urlStr;
            this.startSignal = startSignal;
            this.endSignal = endSignal;
        }

        public String call() {
            String listenMessage;
            InputStream is = null;
            BufferedReader br = null;

            try {
                URL url = new URL(urlStr);
                HttpURLConnection urlConnection =  (HttpURLConnection)url.openConnection();
                urlConnection.setRequestMethod("GET");
                urlConnection.connect();

                is = urlConnection.getInputStream();
                br = new BufferedReader(new InputStreamReader(is));
                // OK message
                System.out.println(br.readLine());

                startSignal.countDown();
                listenMessage = br.readLine();
                endSignal.countDown();
            } catch( Exception ex){
                ex.printStackTrace();
                throw new IllegalStateException("Test UNPREDICTED-FAILURE");
            } finally {
                try {
                    if (is != null) {
                        is.close();
                    }
                } catch(IOException ioe) {
                    // ignore
                }
                try {
                    if (br != null) {
                        br.close();
                    }
                } catch(IOException ioe) {
                    // ignore
                }
            }
            return listenMessage;
        }
    }
}