//
//  ========================================================================
//  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.InputStream;
import java.io.InputStreamReader;
import java.io.OutputStream;
import java.io.PrintWriter;
import java.net.Socket;
import java.nio.charset.StandardCharsets;
import java.util.Arrays;
import java.util.concurrent.BlockingQueue;
import java.util.concurrent.TimeUnit;
import javax.servlet.AsyncContext;
import javax.servlet.ServletException;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

import org.eclipse.jetty.server.handler.AbstractHandler;
import org.eclipse.jetty.util.BlockingArrayQueue;
import org.eclipse.jetty.util.IO;
import org.junit.After;
import org.junit.Before;
import org.junit.Test;

import static org.hamcrest.Matchers.containsString;
import static org.junit.Assert.assertEquals;
import static org.junit.Assert.assertThat;
import static org.junit.Assert.assertTrue;

public class AsyncRequestReadTest
{
    private static Server server;
    private static ServerConnector connector;
    private final static BlockingQueue<Long> __total=new BlockingArrayQueue<>();

    @Before
    public void startServer() throws Exception
    {
        server = new Server();
        connector = new ServerConnector(server);
        connector.setIdleTimeout(10000);
        connector.getConnectionFactory(HttpConnectionFactory.class).getHttpConfiguration().setSendDateHeader(false);
        server.addConnector(connector);
    }

    @After
    public void stopServer() throws Exception
    {
        server.stop();
        server.join();
    }

    @Test
    public void testPipelined() throws Exception
    {
        server.setHandler(new AsyncStreamHandler());
        server.start();
        
        try (final Socket socket =  new Socket("localhost",connector.getLocalPort()))
        {
            socket.setSoTimeout(1000);
            
            byte[] content = new byte[32*4096];
            Arrays.fill(content, (byte)120);

            OutputStream out = socket.getOutputStream();
            String header=
                "POST / HTTP/1.1\r\n"+
                    "Host: localhost\r\n"+
                    "Content-Length: "+content.length+"\r\n"+
                    "Content-Type: bytes\r\n"+
                    "\r\n";
            byte[] h=header.getBytes(StandardCharsets.ISO_8859_1);
            out.write(h);
            out.write(content);
            
            
            header=
                "POST / HTTP/1.1\r\n"+
                    "Host: localhost\r\n"+
                    "Content-Length: "+content.length+"\r\n"+
                    "Content-Type: bytes\r\n"+
                    "Connection: close\r\n"+
                    "\r\n";
            h=header.getBytes(StandardCharsets.ISO_8859_1);
            out.write(h);
            out.write(content);
            out.flush();

            InputStream in = socket.getInputStream();
            String response = IO.toString(in);
            assertTrue(response.indexOf("200 OK")>0);

            long total=__total.poll(5,TimeUnit.SECONDS);
            assertEquals(content.length, total);
            total=__total.poll(5,TimeUnit.SECONDS);
            assertEquals(content.length, total);
        }
    }

    @Test
    public void testAsyncReadsWithDelays() throws Exception
    {
        server.setHandler(new AsyncStreamHandler());
        server.start();
        
        asyncReadTest(64,4,4,20);
        asyncReadTest(256,16,16,50);
        asyncReadTest(256,1,128,10);
        asyncReadTest(128*1024,1,64,10);
        asyncReadTest(256*1024,5321,10,100);
        asyncReadTest(512*1024,32*1024,10,10);
    }


    public void asyncReadTest(int contentSize, int chunkSize, int chunks, int delayMS) throws Exception
    {
        String tst=contentSize+","+chunkSize+","+chunks+","+delayMS;
        //System.err.println(tst);

        try(final Socket socket =  new Socket("localhost",connector.getLocalPort()))
        {

            byte[] content = new byte[contentSize];
            Arrays.fill(content, (byte)120);

            OutputStream out = socket.getOutputStream();
            out.write("POST / HTTP/1.1\r\n".getBytes());
            out.write("Host: localhost\r\n".getBytes());
            out.write(("Content-Length: "+content.length+"\r\n").getBytes());
            out.write("Content-Type: bytes\r\n".getBytes());
            out.write("Connection: close\r\n".getBytes());
            out.write("\r\n".getBytes());
            out.flush();

            int offset=0;
            for (int i=0;i<chunks;i++)
            {
                out.write(content,offset,chunkSize);
                offset+=chunkSize;
                Thread.sleep(delayMS);
            }
            out.write(content,offset,content.length-offset);

            out.flush();

            InputStream in = socket.getInputStream();
            String response = IO.toString(in);
            assertTrue(tst,response.indexOf("200 OK")>0);

            long total=__total.poll(30,TimeUnit.SECONDS);
            assertEquals(tst,content.length, total);
        }
    }


    private static class AsyncStreamHandler extends AbstractHandler
    {
        @Override
        public void handle(String path, final Request request, HttpServletRequest httpRequest, final HttpServletResponse httpResponse) throws IOException, ServletException
        {
            httpResponse.setStatus(500);
            request.setHandled(true);

            final AsyncContext async = request.startAsync();
            // System.err.println("handle "+request.getContentLength());
            
            new Thread()
            {
                @Override
                public void run()
                {
                    long total=0;
                    try(InputStream in = request.getInputStream();)
                    {
                        // System.err.println("reading...");
                        
                        byte[] b = new byte[4*4096];
                        int read;
                        while((read =in.read(b))>=0)
                            total += read;
                    }
                    catch(Exception e)
                    {
                        e.printStackTrace();
                        total =-1;
                    }
                    finally
                    {
                        httpResponse.setStatus(200);
                        async.complete();
                        // System.err.println("read "+total);
                        __total.offer(total);
                    }
                }
            }.start();
        }
    }
    

    @Test
    public void testPartialRead() throws Exception
    {
        server.setHandler(new PartialReaderHandler());
        server.start();
        
        try (final Socket socket =  new Socket("localhost",connector.getLocalPort()))
        {
            socket.setSoTimeout(1000);
            
            byte[] content = new byte[32*4096];
            Arrays.fill(content, (byte)88);

            OutputStream out = socket.getOutputStream();
            String header=
                "POST /?read=10 HTTP/1.1\r\n"+
                    "Host: localhost\r\n"+
                    "Content-Length: "+content.length+"\r\n"+
                    "Content-Type: bytes\r\n"+
                    "\r\n";
            byte[] h=header.getBytes(StandardCharsets.ISO_8859_1);
            out.write(h);
            out.write(content);
            
            header= "POST /?read=10 HTTP/1.1\r\n"+
                    "Host: localhost\r\n"+
                    "Content-Length: "+content.length+"\r\n"+
                    "Content-Type: bytes\r\n"+
                    "Connection: close\r\n"+
                    "\r\n";
            h=header.getBytes(StandardCharsets.ISO_8859_1);
            out.write(h);
            out.write(content);
            out.flush();
            
            BufferedReader in = new BufferedReader(new InputStreamReader(socket.getInputStream()));
            assertThat(in.readLine(),containsString("HTTP/1.1 200 OK"));
            assertThat(in.readLine(),containsString("Content-Length:"));
            assertThat(in.readLine(),containsString("Server:"));
            in.readLine();
            assertThat(in.readLine(),containsString("XXXXXXX"));
            assertThat(in.readLine(),containsString("HTTP/1.1 200 OK"));
            assertThat(in.readLine(),containsString("Connection: close"));
            assertThat(in.readLine(),containsString("Server:"));
            in.readLine();
            assertThat(in.readLine(),containsString("XXXXXXX"));

        }
    }

    @Test
    public void testPartialReadThenShutdown() throws Exception
    {
        server.setHandler(new PartialReaderHandler());
        server.start();
        
        try (final Socket socket =  new Socket("localhost",connector.getLocalPort()))
        {
            socket.setSoTimeout(10000);
            
            byte[] content = new byte[32*4096];
            Arrays.fill(content, (byte)88);

            OutputStream out = socket.getOutputStream();
            String header=
                "POST /?read=10 HTTP/1.1\r\n"+
                    "Host: localhost\r\n"+
                    "Content-Length: "+content.length+"\r\n"+
                    "Content-Type: bytes\r\n"+
                    "\r\n";
            byte[] h=header.getBytes(StandardCharsets.ISO_8859_1);
            out.write(h);
            out.write(content,0,4096);
            out.flush();
            socket.shutdownOutput();

            BufferedReader in = new BufferedReader(new InputStreamReader(socket.getInputStream()));
            assertThat(in.readLine(),containsString("HTTP/1.1 200 OK"));
            assertThat(in.readLine(),containsString("Content-Length:"));
            assertThat(in.readLine(),containsString("Server:"));
            in.readLine();
            assertThat(in.readLine(),containsString("XXXXXXX"));
        }
    }

    @Test
    public void testPartialReadThenClose() throws Exception
    {
        server.setHandler(new PartialReaderHandler());
        server.start();
        
        try (final Socket socket =  new Socket("localhost",connector.getLocalPort()))
        {
            socket.setSoTimeout(1000);
            
            byte[] content = new byte[32*4096];
            Arrays.fill(content, (byte)88);

            OutputStream out = socket.getOutputStream();
            String header=
                "POST /?read=10 HTTP/1.1\r\n"+
                    "Host: localhost\r\n"+
                    "Content-Length: "+content.length+"\r\n"+
                    "Content-Type: bytes\r\n"+
                    "\r\n";
            byte[] h=header.getBytes(StandardCharsets.ISO_8859_1);
            out.write(h);
            out.write(content,0,4096);
            out.flush();

            BufferedReader in = new BufferedReader(new InputStreamReader(socket.getInputStream()));
            assertThat(in.readLine(),containsString("HTTP/1.1 200 OK"));
            assertThat(in.readLine(),containsString("Content-Length:"));
            assertThat(in.readLine(),containsString("Server:"));
            in.readLine();
            assertThat(in.readLine(),containsString("XXXXXXX"));
            
            socket.close();
        }
    }

    private static class PartialReaderHandler extends AbstractHandler
    {
        @Override
        public void handle(String path, final Request request, HttpServletRequest httpRequest, final HttpServletResponse httpResponse) throws IOException, ServletException
        {
            httpResponse.setStatus(200);
            request.setHandled(true);
                        
            BufferedReader in = request.getReader();
            PrintWriter out =httpResponse.getWriter();
            int read=Integer.valueOf(request.getParameter("read"));
            // System.err.println("read="+read);
            for (int i=read;i-->0;)
            {
                int c=in.read();
                if (c<0)
                    break;
                out.write(c);
            }
            out.println();
        }
    }
}
