/*
 * Copyright 2014 Amazon.com, Inc. or its affiliates. All Rights Reserved.
 *
 * Licensed under the Apache License, Version 2.0 (the "License").
 * You may not use this file except in compliance with the License.
 * A copy of the License is located at
 *
 *  http://aws.amazon.com/apache2.0
 *
 * or in the "license" file accompanying this file. This file 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 com.amazonaws.services.dynamodbv2.datamodeling.internal;

import static org.testng.AssertJUnit.assertArrayEquals;
import static org.testng.AssertJUnit.assertEquals;
import static org.testng.AssertJUnit.assertFalse;

import java.io.IOException;
import java.nio.ByteBuffer;
import org.testng.annotations.Test;

public class ByteBufferInputStreamTest {

  @Test
  public void testRead() throws IOException {
    ByteBufferInputStream bis =
        new ByteBufferInputStream(ByteBuffer.wrap(new byte[] {0, 1, 2, 3, 4, 5, 6, 7, 8, 9}));
    for (int x = 0; x < 10; ++x) {
      assertEquals(10 - x, bis.available());
      assertEquals(x, bis.read());
    }
    assertEquals(0, bis.available());
    bis.close();
  }

  @Test
  public void testReadByteArray() throws IOException {
    ByteBufferInputStream bis =
        new ByteBufferInputStream(ByteBuffer.wrap(new byte[] {0, 1, 2, 3, 4, 5, 6, 7, 8, 9}));
    assertEquals(10, bis.available());

    byte[] buff = new byte[4];

    int len = bis.read(buff);
    assertEquals(4, len);
    assertEquals(6, bis.available());
    assertArrayEquals(new byte[] {0, 1, 2, 3}, buff);

    len = bis.read(buff);
    assertEquals(4, len);
    assertEquals(2, bis.available());
    assertArrayEquals(new byte[] {4, 5, 6, 7}, buff);

    len = bis.read(buff);
    assertEquals(2, len);
    assertEquals(0, bis.available());
    assertArrayEquals(new byte[] {8, 9, 6, 7}, buff);
    bis.close();
  }

  @Test
  public void testSkip() throws IOException {
    ByteBufferInputStream bis =
        new ByteBufferInputStream(
            ByteBuffer.wrap(new byte[] {(byte) 0xFA, 15, 15, 0, 1, 2, 3, 4, 5, 6, 7, 8, 9}));
    assertEquals(13, bis.available());
    assertEquals(0xFA, bis.read());
    assertEquals(12, bis.available());
    bis.skip(2);
    assertEquals(10, bis.available());
    for (int x = 0; x < 10; ++x) {
      assertEquals(x, bis.read());
    }
    assertEquals(0, bis.available());
    assertEquals(-1, bis.read());
    bis.close();
  }

  @Test
  public void testMarkSupported() throws IOException {
    try (ByteBufferInputStream bis = new ByteBufferInputStream(ByteBuffer.allocate(0))) {
      assertFalse(bis.markSupported());
    }
  }
}