//
//  ========================================================================
//  Copyright (c) 1995-2022 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.IOException;
import java.net.Socket;
import java.util.concurrent.CountDownLatch;
import java.util.concurrent.TimeUnit;
import java.util.concurrent.atomic.AtomicInteger;
import javax.servlet.AsyncContext;
import javax.servlet.ServletException;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

import org.eclipse.jetty.io.Connection;
import org.eclipse.jetty.server.handler.AbstractHandler;
import org.eclipse.jetty.util.IO;
import org.junit.jupiter.api.Test;

import static org.junit.jupiter.api.Assertions.assertEquals;

public class HalfCloseTest
{
    @Test
    public void testHalfCloseRace() throws Exception
    {
        Server server = new Server();
        ServerConnector connector = new ServerConnector(server, 1, 1);
        connector.setPort(0);
        connector.setIdleTimeout(500);
        server.addConnector(connector);
        TestHandler handler = new TestHandler();
        server.setHandler(handler);

        server.start();

        try (Socket client = new Socket("localhost", connector.getLocalPort());)
        {
            int in = client.getInputStream().read();
            assertEquals(-1, in);

            client.getOutputStream().write("GET / HTTP/1.0\r\n\r\n".getBytes());

            Thread.sleep(200);
            assertEquals(0, handler.getHandled());
        }
    }

    @Test
    public void testCompleteClose() throws Exception
    {
        Server server = new Server();
        ServerConnector connector = new ServerConnector(server, 1, 1);
        connector.setPort(0);
        connector.setIdleTimeout(5000);
        final AtomicInteger opened = new AtomicInteger(0);
        final CountDownLatch closed = new CountDownLatch(1);
        connector.addBean(new Connection.Listener()
        {
            @Override
            public void onOpened(Connection connection)
            {
                opened.incrementAndGet();
            }

            @Override
            public void onClosed(Connection connection)
            {
                closed.countDown();
            }
        });
        server.addConnector(connector);
        TestHandler handler = new TestHandler();
        server.setHandler(handler);

        server.start();

        try (Socket client = new Socket("localhost", connector.getLocalPort());)
        {
            client.getOutputStream().write("GET / HTTP/1.0\r\n\r\n".getBytes());
            IO.toString(client.getInputStream());
            assertEquals(1, handler.getHandled());
            assertEquals(1, opened.get());
        }
        assertEquals(true, closed.await(1, TimeUnit.SECONDS));
    }

    @Test
    public void testAsyncClose() throws Exception
    {
        Server server = new Server();
        ServerConnector connector = new ServerConnector(server, 1, 1);
        connector.setPort(0);
        connector.setIdleTimeout(5000);
        final AtomicInteger opened = new AtomicInteger(0);
        final CountDownLatch closed = new CountDownLatch(1);
        connector.addBean(new Connection.Listener()
        {
            @Override
            public void onOpened(Connection connection)
            {
                opened.incrementAndGet();
            }

            @Override
            public void onClosed(Connection connection)
            {
                closed.countDown();
            }
        });
        server.addConnector(connector);
        AsyncHandler handler = new AsyncHandler();
        server.setHandler(handler);

        server.start();

        try (Socket client = new Socket("localhost", connector.getLocalPort());)
        {
            client.getOutputStream().write("GET / HTTP/1.0\r\n\r\n".getBytes());
            IO.toString(client.getInputStream());
            assertEquals(1, handler.getHandled());
            assertEquals(1, opened.get());
        }
        assertEquals(true, closed.await(1, TimeUnit.SECONDS));
    }

    public static class TestHandler extends AbstractHandler
    {
        transient int handled;

        public TestHandler()
        {
        }

        @Override
        public void handle(String target, Request baseRequest, HttpServletRequest request, HttpServletResponse response) throws IOException, ServletException
        {
            baseRequest.setHandled(true);
            handled++;
            response.setContentType("text/html;charset=utf-8");
            response.setStatus(HttpServletResponse.SC_OK);
            response.getWriter().println("<h1>Test</h1>");
        }

        public int getHandled()
        {
            return handled;
        }
    }

    public static class AsyncHandler extends AbstractHandler
    {
        transient int handled;

        public AsyncHandler()
        {
        }

        @Override
        public void handle(String target, Request baseRequest, final HttpServletRequest request, final HttpServletResponse response) throws IOException, ServletException
        {
            baseRequest.setHandled(true);
            handled++;

            final AsyncContext async = request.startAsync();
            new Thread()
            {
                @Override
                public void run()
                {
                    try
                    {
                        response.setContentType("text/html;charset=utf-8");
                        response.setStatus(HttpServletResponse.SC_OK);
                        response.getWriter().println("<h1>Test</h1>");
                    }
                    catch (Exception ex)
                    {
                        System.err.println(ex);
                    }
                    finally
                    {
                        async.complete();
                    }
                }
            }.start();
        }

        public int getHandled()
        {
            return handled;
        }
    }
}
