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 * 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
 * <p>
 * http://www.apache.org/licenses/LICENSE-2.0
 * <p>
 * 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.
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package org.apache.cayenne.rop.http;

import org.apache.cayenne.CayenneRuntimeException;
import org.apache.cayenne.rop.ROPConstants;
import org.apache.cayenne.util.Http2TestServer;
import org.eclipse.jetty.client.HttpClient;
import org.eclipse.jetty.http2.client.HTTP2Client;
import org.eclipse.jetty.http2.client.http.HttpClientTransportOverHTTP2;
import org.eclipse.jetty.util.ssl.SslContextFactory;
import org.junit.AfterClass;
import org.junit.BeforeClass;
import org.junit.Test;

import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.io.*;
import java.util.stream.Collectors;

import static org.junit.Assert.assertArrayEquals;
import static org.junit.Assert.assertEquals;

public class JettyHttpROPConnectorIT {

    private static final String MESSAGE = "test message";
    private static final String SEND_MESSAGE_SESSION = "send message session";

    private static JettyHttpROPConnector ropConnector;
    private static Http2TestServer server;

    @BeforeClass
    public static void setUpClass() throws Exception {
        // Start the test server
        class TestServlet extends HttpServlet {
            @Override
            protected void doPost(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
                String sharedSessionName = req.getParameter(ROPConstants.SESSION_NAME_PARAMETER);

                if (sharedSessionName == null) {
                    resp.getOutputStream().write(MESSAGE.getBytes());
                } else if (sharedSessionName.equals(SEND_MESSAGE_SESSION)) {
                    resp.getOutputStream().write(toByteArray(req.getInputStream()));
                } else {
                    resp.getOutputStream().write((MESSAGE + " " + sharedSessionName).getBytes());
                }
            }
        }

        server = Http2TestServer.servlet(new TestServlet()).start();

        ropConnector = new JettyHttpROPConnector(initJettyHttp2Client(), server.getBasePath(), null);
    }

    protected static HttpClient initJettyHttp2Client() {
        try {
            HttpClientTransportOverHTTP2 http2 = new HttpClientTransportOverHTTP2(new HTTP2Client());
            http2.setUseALPN(false);

            HttpClient httpClient = new HttpClient(http2, new SslContextFactory());
            httpClient.start();

            return httpClient;
        } catch (Exception e) {
            throw new CayenneRuntimeException("Exception while starting Jetty HttpClient over HTTP/2.", e);
        }
    }

    @AfterClass
    public static void tearDownClass() throws Exception {
        server.stop();
        ropConnector.close();
    }

    @Test
    public void testEstablishSession() throws Exception {
        String message = read(ropConnector.establishSession());
        assertEquals(MESSAGE, message);
    }

    @Test
    public void testEstablishSharedSession() throws Exception {
        String sharedSessionName = "test session";
        String message = read(ropConnector.establishSharedSession(sharedSessionName));
        assertEquals(MESSAGE + " " + sharedSessionName, message);
    }

    @Test
    public void sendMessage() throws Exception {
        ropConnector.establishSharedSession(SEND_MESSAGE_SESSION);

        byte[] message = toByteArray(ropConnector.sendMessage(MESSAGE.getBytes()));
        assertArrayEquals(MESSAGE.getBytes(), message);
    }

    private static String read(InputStream input) throws IOException {
        try (BufferedReader buffer = new BufferedReader(new InputStreamReader(input))) {
            return buffer.lines().collect(Collectors.joining("\n"));
        }
    }

    private static byte[] toByteArray(InputStream inputStream) throws IOException {
        try (ByteArrayOutputStream baos = new ByteArrayOutputStream()) {

            int reads = inputStream.read();
            while (reads != -1) {
                baos.write(reads);
                reads = inputStream.read();
            }

            return baos.toByteArray();
        }
    }

}