/*
 * 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.reef.io.storage;

import org.apache.reef.exception.evaluator.ServiceException;
import org.apache.reef.io.Accumulator;
import org.junit.Assert;
import org.junit.Test;

import java.io.ByteArrayInputStream;
import java.io.ByteArrayOutputStream;
import java.io.IOException;
import java.util.Arrays;

public class FramingTest {

  @Test
  public void frameRoundTripTest() throws IOException, ServiceException {
    final ByteArrayOutputStream baos = new ByteArrayOutputStream();
    final ByteArrayOutputStream baos2 = new ByteArrayOutputStream();
    final FramingOutputStream o = new FramingOutputStream(baos);
    final FramingOutputStream o2 = new FramingOutputStream(baos2);
    final Accumulator<byte[]> a = o2.accumulator();
    int offset = 0;
    for (int i = 0; i < 256; i++) {
      final byte[] b = new byte[i];
      Arrays.fill(b, (byte) i);
      o.write(b);
      if (i == 255) {
        o.close();
      } else {
        o.nextFrame();
      }
      offset += 4 + i;
      Assert.assertEquals(offset, o.getCurrentOffset());
      a.add(b);
      Assert.assertEquals(offset, o2.getCurrentOffset());
    }
    a.close();
    o2.close();
    final byte[] b1 = baos.toByteArray();
    final byte[] b2 = baos2.toByteArray();
    Assert.assertArrayEquals(b1, b2);
    final FramingInputStream inA1 = new FramingInputStream(new ByteArrayInputStream(b1));
    final FramingInputStream inA2 = new FramingInputStream(new ByteArrayInputStream(b2));
    for (int i = 0; i <= 256; i++) {
      final byte[] b = new byte[i];
      Arrays.fill(b, (byte) i);
      final byte[] f = inA1.readFrame();
      final byte[] g = inA2.readFrame();
      if (i == 256) {
        Assert.assertNull(f);
        Assert.assertNull(g);
      } else {
        Assert.assertArrayEquals(b, f);
        Assert.assertArrayEquals(b, g);
      }
    }
    inA2.close();
    inA1.close();

    final FramingInputStream inB1 = new FramingInputStream(new ByteArrayInputStream(b1));
    int i = 0;
    for (final byte[] bin : inB1) {
      final byte[] b = new byte[i];
      Arrays.fill(b, (byte) i);
      Assert.assertArrayEquals(b, bin);
      i++;
    }
    Assert.assertEquals(256, i);
    inB1.close();

    final FramingInputStream inB2 = new FramingInputStream(new ByteArrayInputStream(b2));
    i = 0;
    for (final byte[] bin : inB2) {
      final byte[] b = new byte[i];
      Arrays.fill(b, (byte) i);
      Assert.assertArrayEquals(b, bin);
      i++;
    }
    Assert.assertEquals(256, i);
    inB2.close();
    Assert.assertArrayEquals(b1, b2);
  }

}