//
//  ========================================================================
//  Copyright (c) 1995-2020 Mort Bay Consulting Pty Ltd and others.
//  ------------------------------------------------------------------------
//  All rights reserved. This program and the accompanying materials
//  are made available under the terms of the Eclipse Public License v1.0
//  and Apache License v2.0 which accompanies this distribution.
//
//      The Eclipse Public License is available at
//      http://www.eclipse.org/legal/epl-v10.html
//
//      The Apache License v2.0 is available at
//      http://www.opensource.org/licenses/apache2.0.php
//
//  You may elect to redistribute this code under either of these licenses.
//  ========================================================================
//

package org.eclipse.jetty.server;

import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;
import java.io.OutputStream;
import java.net.Socket;
import java.net.URI;
import java.nio.charset.StandardCharsets;
import java.util.concurrent.CountDownLatch;
import java.util.concurrent.TimeUnit;

import org.junit.Test;

import static org.junit.Assert.assertTrue;

/**
 * HttpServer Tester.
 */
public abstract class ConnectorCloseTestBase extends HttpServerTestFixture
{
    private static String __content =
        "Lorem ipsum dolor sit amet, consectetur adipiscing elit. In quis felis nunc. "+
        "Quisque suscipit mauris et ante auctor ornare rhoncus lacus aliquet. Pellentesque "+
        "habitant morbi tristique senectus et netus et malesuada fames ac turpis egestas. "+
        "Vestibulum sit amet felis augue, vel convallis dolor. Cras accumsan vehicula diam "+
        "at faucibus. Etiam in urna turpis, sed congue mi. Morbi et lorem eros. Donec vulputate "+
        "velit in risus suscipit lobortis. Aliquam id urna orci, nec sollicitudin ipsum. "+
        "Cras a orci turpis. Donec suscipit vulputate cursus. Mauris nunc tellus, fermentum "+
        "eu auctor ut, mollis at diam. Quisque porttitor ultrices metus, vitae tincidunt massa "+
        "sollicitudin a. Vivamus porttitor libero eget purus hendrerit cursus. Integer aliquam "+
        "consequat mauris quis luctus. Cras enim nibh, dignissim eu faucibus ac, mollis nec neque. "+
        "Aliquam purus mauris, consectetur nec convallis lacinia, porta sed ante. Suspendisse "+
        "et cursus magna. Donec orci enim, molestie a lobortis eu, imperdiet vitae neque.";
    private static int __length = __content.length();

    /* ------------------------------------------------------------ */
    @Test
    public void testCloseBetweenRequests() throws Exception
    {
        final int requestCount = 32;
        final CountDownLatch latch = new CountDownLatch(requestCount);

        configureServer(new HelloWorldHandler());

        URI uri = _server.getURI();
        Socket client = newSocket(uri.getHost(),uri.getPort());
        try
        {
            OutputStream os = client.getOutputStream();

            ResponseReader reader = new ResponseReader(client) {
                private int _index = 0;

                /* ------------------------------------------------------------ */
                @Override
                protected int doRead() throws IOException, InterruptedException
                {
                    int count = super.doRead();
                    if (count > 0)
                    {
                        int idx;
                        while ((idx=_response.indexOf("HTTP/1.1 200 OK", _index)) >= 0)
                        {
                            latch.countDown();
                            _index = idx + 15;
                        }
                    }

                    return count;
                }
            };

            Thread runner = new Thread(reader);
            runner.start();

            for (int pipeline = 1; pipeline <= requestCount; pipeline++)
            {
                if (pipeline == requestCount / 2)
                {
                    // wait for at least 1 request to have been received
                    if (latch.getCount()==requestCount)
                        Thread.sleep(1);
                    _connector.close();
                }

                String request =
                        "GET /data?writes=1&block=16&id="+pipeline+" HTTP/1.1\r\n"+
                        "host: "+uri.getHost()+":"+uri.getPort()+"\r\n"+
                        "user-agent: testharness/1.0 (blah foo/bar)\r\n"+
                        "accept-encoding: nothing\r\n"+
                        "cookie: aaa=1234567890\r\n"+
                        "\r\n";
                os.write(request.getBytes());
                os.flush();

                Thread.sleep(25);
            }

            assertTrue(latch.await(5, TimeUnit.SECONDS));

            reader.setDone();
            runner.join();
        }
        finally
        {
            client.close();
        }
    }

    /* ------------------------------------------------------------ */
    private int iterations(int cnt)
    {
        return cnt > 0 ? iterations(--cnt) + cnt : 0;
    }

    /* ------------------------------------------------------------ */
    @Test
    public void testCloseBetweenChunks() throws Exception
    {
        configureServer(new EchoHandler());

        URI uri = _server.getURI();
        Socket client = newSocket(uri.getHost(),uri.getPort());
        try
        {
            OutputStream os = client.getOutputStream();

            ResponseReader reader = new ResponseReader(client);
            Thread runner = new Thread(reader);
            runner.start();

            byte[] bytes = __content.getBytes("utf-8");

            os.write((
                "POST /echo?charset=utf-8 HTTP/1.1\r\n"+
                "host: "+uri.getHost()+":"+uri.getPort()+"\r\n"+
                "content-type: text/plain; charset=utf-8\r\n"+
                "content-length: "+bytes.length+"\r\n"+
                "\r\n"
            ).getBytes(StandardCharsets.ISO_8859_1));

            int len = bytes.length;
            int offset = 0;
            int stop = len / 2;
            while (offset < stop)
            {
                os.write(bytes, offset, 64);
                offset += 64;
                Thread.sleep(25);
            }

            _connector.close();

            while (offset < len)
            {
                os.write(bytes, offset, len-offset <=64 ? len-offset : 64);
                offset += 64;
                Thread.sleep(25);
            }
            os.flush();

            reader.setDone();
            runner.join();

            String in = reader.getResponse().toString();
            assertTrue(in.indexOf(__content.substring(__length-64))>0);
        }
        finally
        {
            client.close();
        }
    }


    /* ------------------------------------------------------------ */
    public class ResponseReader implements Runnable
    {
        private boolean _done = false;

        protected char[] _buffer;
        protected StringBuffer _response;
        protected BufferedReader _reader;

        /* ------------------------------------------------------------ */
        public ResponseReader(Socket client) throws IOException
        {
            _buffer = new char[256];
            _response = new StringBuffer();
            _reader = new BufferedReader(new InputStreamReader(client.getInputStream()));
        }

        /* ------------------------------------------------------------ */
        public void setDone()
        {
            _done = true;
        }

        public StringBuffer getResponse()
        {
            return _response;
        }

        /* ------------------------------------------------------------ */
        /**
         * @see java.lang.Runnable#run()
         */
        public void run()
        {
            try
            {
                int count = 0;
                while (!_done || count > 0)
                {
                    count = doRead();
                }
            }
            catch (IOException ex) { }
            catch (InterruptedException ex) { }
            finally
            {
                try
                {
                    _reader.close();
                }
                catch (IOException e) { }
            }
        }

        /* ------------------------------------------------------------ */
        protected int doRead() throws IOException, InterruptedException
        {
            if (!_reader.ready())
            {
                Thread.sleep(25);
            }

            int count = 0;
            if (_reader.ready())
            {
                count = _reader.read(_buffer);
                if (count > 0)
                {
                    _response.append(_buffer, 0, count);
                }
            }

            return count;
        }
    }
}
