/**
 * 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.
 */

package org.apache.cassandra.test.microbench;


import org.apache.cassandra.utils.CRC32Factory.CRC32Ex;
import org.apache.cassandra.utils.PureJavaCrc32;
import org.openjdk.jmh.annotations.*;

import java.io.IOException;
import java.nio.ByteBuffer;
import java.util.concurrent.ThreadLocalRandom;
import java.util.concurrent.TimeUnit;
import java.util.zip.Adler32;
import java.util.zip.CRC32;

@BenchmarkMode(Mode.Throughput)
@OutputTimeUnit(TimeUnit.SECONDS)
@Warmup(iterations = 2, time = 2, timeUnit = TimeUnit.SECONDS)
@Measurement(iterations = 2, time = 2, timeUnit = TimeUnit.SECONDS)
@Fork(value = 3)
@Threads(1)
@State(Scope.Benchmark)
public class Sample
{
    @Param({"128", "512", "1024", "1048576"})
    //@Param({"1048576"})
    public int byteSize;

    public byte bytes[];

    public ByteBuffer bufferArray;

    public ByteBuffer bufferDirect;

    public long expected;
    public long expectedAdler;

    public void check(long val) {
        if (val != expected) {
            System.out.println("oh snap");
            System.exit(-1);
        }
    }

    public void checkAdler(long val) {
        if (val != expectedAdler) {
            System.out.println("oh snap");
            System.exit(-1);
        }
    }

    @Setup(Level.Iteration)
    public void setup() {
        bytes = new byte[byteSize];
        bufferArray = ByteBuffer.wrap(bytes);
        bufferDirect = ByteBuffer.allocateDirect(byteSize);
        bufferDirect.put(bytes).clear();
        CRC32 crc = new CRC32();
        crc.update(bytes);
        expected = crc.getValue();
        Adler32 a32 = new Adler32();
        a32.update(bytes);
        expectedAdler = a32.getValue();
    }

    @Benchmark
    public long CRC32OriginalArray()
    {
        CRC32 crc = new CRC32();
        crc.update(bytes, 0, bytes.length);
        check(crc.getValue());
        return crc.getValue();
    }

    @Benchmark
    public long PureJavaCrc32Array() {
        PureJavaCrc32 crc = new PureJavaCrc32();
        crc.update(bytes, 0, bytes.length);
        check(crc.getValue());
        return crc.getValue();
    }

    @Benchmark
    public long Adler32Array()
    {
        Adler32 crc = new Adler32();
        crc.update(bytes, 0, bytes.length);
        checkAdler(crc.getValue());
        return crc.getValue();
    }

//    @Benchmark
//    public long CRC32Array()
//    {
//        CRC32Ex crc = new CRC32Ex();
//        crc.update(bytes, 0, bytes.length);
//        check(crc.getValue());
//        return crc.getValue();
//    }
//
//    @Benchmark
//    public long CRC32ByteBuffer()
//    {
//        bufferArray.clear();
//        CRC32Ex crc = new CRC32Ex();
//        crc.update(bufferArray);
//        return crc.getValue();
//    }
//
//    @Benchmark
//    public long CRC32ByteBufferDirect()
//    {
//        bufferDirect.clear();
//        CRC32Ex crc = new CRC32Ex();
//        crc.update(bufferDirect);
//        return crc.getValue();
//    }
//
//    @Benchmark
//    public long CRC32ByteBufferWrapped()
//    {
//        bufferArray.clear();
//        CRC32Ex crc = new CRC32Ex();
//        crc.update(bufferArray, 0, bytes.length);
//        check(crc.getValue());
//        return crc.getValue();
//    }
//
//    @Benchmark
//    public long CRC32ByteBufferDirectWrapped()
//    {
//        bufferDirect.clear();
//        CRC32Ex crc = new CRC32Ex();
//        crc.update(bufferDirect, 0, bytes.length);
//        check(crc.getValue());
//        return crc.getValue();
//    }
//    @Benchmark
//    public long PureJavaCrc32ByteBuffer() {
//        bufferArray.clear();
//        PureJavaCrc32 crc = new PureJavaCrc32();
//        crc.update(bufferArray, 0, bytes.length);
//        check(crc.getValue());
//        return crc.getValue();
//    }
//
//    @Benchmark
//    public long PureJavaCrc32ByteBufferDirect() {
//        bufferDirect.clear();
//        PureJavaCrc32 crc = new PureJavaCrc32();
//        crc.update(bufferDirect, 0, bytes.length);
//        check(crc.getValue());
//        return crc.getValue();
//    }
}