/*
 * ====================================================================
 * 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
 *
 *   http://www.apache.org/licenses/LICENSE-2.0
 *
 * 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.
 * ====================================================================
 *
 * This software consists of voluntary contributions made by many
 * individuals on behalf of the Apache Software Foundation.  For more
 * information on the Apache Software Foundation, please see
 * <http://www.apache.org/>.
 *
 */

package org.apache.hc.core5.testing.classic;

import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;
import java.util.Arrays;
import java.util.Collection;

import org.apache.hc.core5.http.ClassicHttpRequest;
import org.apache.hc.core5.http.ClassicHttpResponse;
import org.apache.hc.core5.http.ContentType;
import org.apache.hc.core5.http.HttpHost;
import org.apache.hc.core5.http.Method;
import org.apache.hc.core5.http.URIScheme;
import org.apache.hc.core5.http.impl.bootstrap.HttpRequester;
import org.apache.hc.core5.http.impl.bootstrap.RequesterBootstrap;
import org.apache.hc.core5.http.impl.io.DefaultBHttpClientConnectionFactory;
import org.apache.hc.core5.http.impl.io.MonitoringResponseOutOfOrderStrategy;
import org.apache.hc.core5.http.io.SocketConfig;
import org.apache.hc.core5.http.io.entity.AbstractHttpEntity;
import org.apache.hc.core5.http.io.entity.EntityUtils;
import org.apache.hc.core5.http.message.BasicClassicHttpRequest;
import org.apache.hc.core5.http.protocol.HttpCoreContext;
import org.apache.hc.core5.io.CloseMode;
import org.apache.hc.core5.testing.SSLTestContexts;
import org.apache.hc.core5.util.Timeout;
import org.junit.Assert;
import org.junit.Rule;
import org.junit.Test;
import org.junit.rules.ExternalResource;
import org.junit.runner.RunWith;
import org.junit.runners.Parameterized;

@RunWith(Parameterized.class)
public class MonitoringResponseOutOfOrderStrategyIntegrationTest {

    // Use a 16k buffer for consistent results across systems
    private static final int BUFFER_SIZE = 16 * 1024;
    private static final Timeout TIMEOUT = Timeout.ofSeconds(3);

    @Parameterized.Parameters(name = "{0}")
    public static Collection<Object[]> protocols() {
        return Arrays.asList(new Object[][]{
                { URIScheme.HTTP },
                { URIScheme.HTTPS }
        });
    }

    private final URIScheme scheme;
    private ClassicTestServer server;
    private HttpRequester requester;

    public MonitoringResponseOutOfOrderStrategyIntegrationTest(final URIScheme scheme) {
        this.scheme = scheme;
    }

    @Rule
    public ExternalResource serverResource = new ExternalResource() {

        @Override
        protected void before() throws Throwable {
            server = new ClassicTestServer(
                    scheme == URIScheme.HTTPS ? SSLTestContexts.createServerSSLContext() : null,
                    SocketConfig.custom()
                            .setSoTimeout(TIMEOUT)
                            .setSndBufSize(BUFFER_SIZE)
                            .setRcvBufSize(BUFFER_SIZE)
                            .setSoKeepAlive(false)
                            .build());
        }

        @Override
        protected void after() {
            if (server != null) {
                try {
                    server.shutdown(CloseMode.IMMEDIATE);
                    server = null;
                } catch (final Exception ignore) {
                }
            }
        }

    };

    @Rule
    public ExternalResource requesterResource = new ExternalResource() {

        @Override
        protected void before() throws Throwable {
            requester = RequesterBootstrap.bootstrap()
                    .setSslContext(scheme == URIScheme.HTTPS  ? SSLTestContexts.createClientSSLContext() : null)
                    .setSocketConfig(SocketConfig.custom()
                            .setSoTimeout(TIMEOUT)
                            .setRcvBufSize(BUFFER_SIZE)
                            .setSndBufSize(BUFFER_SIZE)
                            .setSoKeepAlive(false)
                            .build())
                    .setStreamListener(LoggingHttp1StreamListener.INSTANCE)
                    .setConnPoolListener(LoggingConnPoolListener.INSTANCE)
                    .setConnectionFactory(DefaultBHttpClientConnectionFactory.builder()
                            .responseOutOfOrderStrategy(MonitoringResponseOutOfOrderStrategy.INSTANCE)
                            .build())
                    .create();
        }

        @Override
        protected void after() {
            if (requester != null) {
                try {
                    requester.close(CloseMode.IMMEDIATE);
                    requester = null;
                } catch (final Exception ignore) {
                }
            }
        }

    };

    @Test(timeout = 5000) // Failures may hang
    public void testResponseOutOfOrderWithDefaultStrategy() throws Exception {
        this.server.registerHandler("*", (request, response, context) -> {
            response.setCode(400);
            response.setEntity(new AllOnesHttpEntity(200000));
        });

        this.server.start(null, null, null);

        final HttpCoreContext context = HttpCoreContext.create();
        final HttpHost host = new HttpHost(scheme.id, "localhost", this.server.getPort());

        final ClassicHttpRequest post = new BasicClassicHttpRequest(Method.POST, "/");
        post.setEntity(new AllOnesHttpEntity(200000));

        try (final ClassicHttpResponse response = requester.execute(host, post, TIMEOUT, context)) {
            Assert.assertEquals(400, response.getCode());
            EntityUtils.consumeQuietly(response.getEntity());
        }
    }

    private static final class AllOnesHttpEntity extends AbstractHttpEntity {
        private long remaining;

        protected AllOnesHttpEntity(final long length) {
            super(ContentType.APPLICATION_OCTET_STREAM, null, true);
            this.remaining = length;
        }

        @Override
        public InputStream getContent() {
            throw new UnsupportedOperationException();
        }

        @Override
        public void writeTo(final OutputStream outStream) throws IOException {
            final byte[] buf = new byte[1024];
            while (remaining > 0) {
                final int writeLength = (int) Math.min(remaining, buf.length);
                outStream.write(buf, 0, writeLength);
                outStream.flush();
                remaining -= writeLength;
            }
        }

        @Override
        public boolean isStreaming() {
            return true;
        }

        @Override
        public void close() {
        }

        @Override
        public long getContentLength() {
            return -1L;
        }
    }
}