/*
 * ====================================================================
 * 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.http.nio.entity;

import java.io.IOException;
import java.nio.ByteBuffer;
import java.util.concurrent.atomic.AtomicLong;

import org.apache.hc.core5.concurrent.FutureCallback;
import org.apache.hc.core5.http.ContentType;
import org.apache.hc.core5.http.HttpException;
import org.apache.hc.core5.http.impl.BasicEntityDetails;
import org.apache.hc.core5.http.nio.AsyncEntityConsumer;
import org.apache.hc.core5.util.ByteArrayBuffer;
import org.junit.Assert;
import org.junit.Test;

public class TestAbstractBinAsyncEntityConsumer {

    static private class ByteArrayAsyncEntityConsumer extends AbstractBinAsyncEntityConsumer<byte[]> {

        private final ByteArrayBuffer buffer;

        public ByteArrayAsyncEntityConsumer() {
            super();
            this.buffer = new ByteArrayBuffer(1024);
        }

        @Override
        protected void streamStart(final ContentType contentType) throws HttpException, IOException {
        }

        @Override
        protected int capacity() {
            return Integer.MAX_VALUE;
        }

        @Override
        protected void data(final ByteBuffer src, final boolean endOfStream) throws IOException {
            if (src == null) {
                return;
            }
            if (src.hasArray()) {
                buffer.append(src.array(), src.arrayOffset() + src.position(), src.remaining());
            } else {
                while (src.hasRemaining()) {
                    buffer.append(src.get());
                }
            }
        }

        @Override
        protected byte[] generateContent() throws IOException {
            return buffer.toByteArray();
        }

        @Override
        public void releaseResources() {
        }

    };

    @Test
    public void testConsumeData() throws Exception {

        final AsyncEntityConsumer<byte[]> consumer = new ByteArrayAsyncEntityConsumer();

        final AtomicLong count = new AtomicLong(0);
        consumer.streamStart(new BasicEntityDetails(-1, ContentType.APPLICATION_OCTET_STREAM), new FutureCallback<byte[]>() {

            @Override
            public void completed(final byte[] result) {
                count.incrementAndGet();
            }

            @Override
            public void failed(final Exception ex) {
                count.incrementAndGet();
            }

            @Override
            public void cancelled() {
                count.incrementAndGet();
            }

        });

        consumer.consume(ByteBuffer.wrap(new byte[]{'1', '2', '3'}));
        consumer.consume(ByteBuffer.wrap(new byte[]{'4', '5'}));
        consumer.consume(ByteBuffer.wrap(new byte[]{}));

        Assert.assertEquals(null, consumer.getContent());
        consumer.streamEnd(null);

        Assert.assertArrayEquals(new byte[] {'1', '2', '3', '4', '5'}, consumer.getContent());
        Assert.assertEquals(1L, count.longValue());
    }

}