/*
 * Copyright 2014 The Netty Project
 *
 * The Netty Project 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.
 */
package io.netty.handler.codec.compression;

import io.netty.buffer.ByteBuf;
import io.netty.buffer.CompositeByteBuf;
import io.netty.buffer.Unpooled;
import io.netty.channel.embedded.EmbeddedChannel;
import io.netty.util.ReferenceCountUtil;

import static org.hamcrest.Matchers.*;
import static org.junit.Assert.*;

public class FastLzIntegrationTest extends IntegrationTest {

    public static class TestWithChecksum extends IntegrationTest {

        @Override
        protected EmbeddedChannel createEncoderEmbeddedChannel() {
            return new EmbeddedChannel(new FastLzFrameEncoder(true));
        }

        @Override
        protected EmbeddedChannel createDecoderEmbeddedChannel() {
            return new EmbeddedChannel(new FastLzFrameDecoder(true));
        }
    }

    public static class TestRandomChecksum extends IntegrationTest {

        @Override
        protected EmbeddedChannel createEncoderEmbeddedChannel() {
            return new EmbeddedChannel(new FastLzFrameEncoder(rand.nextBoolean()));
        }

        @Override
        protected EmbeddedChannel createDecoderEmbeddedChannel() {
            return new EmbeddedChannel(new FastLzFrameDecoder(rand.nextBoolean()));
        }
    }

    @Override
    protected EmbeddedChannel createEncoderEmbeddedChannel() {
        return new EmbeddedChannel(new FastLzFrameEncoder(rand.nextBoolean()));
    }

    @Override
    protected EmbeddedChannel createDecoderEmbeddedChannel() {
        return new EmbeddedChannel(new FastLzFrameDecoder(rand.nextBoolean()));
    }

    @Override   // test batched flow of data
    protected void testIdentity(final byte[] data) {
        final ByteBuf original = Unpooled.wrappedBuffer(data);
        final EmbeddedChannel encoder = createEncoderEmbeddedChannel();
        final EmbeddedChannel decoder = createDecoderEmbeddedChannel();

        try {
            int written = 0, length = rand.nextInt(100);
            while (written + length < data.length) {
                ByteBuf in = Unpooled.wrappedBuffer(data, written, length);
                encoder.writeOutbound(in);
                written += length;
                length = rand.nextInt(100);
            }
            ByteBuf in = Unpooled.wrappedBuffer(data, written, data.length - written);
            encoder.writeOutbound(in);
            encoder.finish();

            ByteBuf msg;
            final CompositeByteBuf compressed = Unpooled.compositeBuffer();
            while ((msg = encoder.readOutbound()) != null) {
                compressed.addComponent(msg);
                compressed.writerIndex(compressed.writerIndex() + msg.readableBytes());
            }
            assertThat(compressed, is(notNullValue()));

            final byte[] compressedArray = new byte[compressed.readableBytes()];
            compressed.readBytes(compressedArray);
            written = 0;
            length = rand.nextInt(100);
            while (written + length < compressedArray.length) {
                in = Unpooled.wrappedBuffer(compressedArray, written, length);
                decoder.writeInbound(in);
                written += length;
                length = rand.nextInt(100);
            }
            in = Unpooled.wrappedBuffer(compressedArray, written, compressedArray.length - written);
            decoder.writeInbound(in);

            assertFalse(compressed.isReadable());
            final CompositeByteBuf decompressed = Unpooled.compositeBuffer();
            while ((msg = decoder.readInbound()) != null) {
                decompressed.addComponent(msg);
                decompressed.writerIndex(decompressed.writerIndex() + msg.readableBytes());
            }
            assertEquals(original, decompressed);

            compressed.release();
            decompressed.release();
            original.release();
        } finally {
            encoder.close();
            decoder.close();

            for (;;) {
                Object msg = encoder.readOutbound();
                if (msg == null) {
                    break;
                }
                ReferenceCountUtil.release(msg);
            }

            for (;;) {
                Object msg = decoder.readInbound();
                if (msg == null) {
                    break;
                }
                ReferenceCountUtil.release(msg);
            }
        }
    }
}
