// 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 streamer;

import java.nio.charset.Charset;

/**
 * Assert that writes to this buffer are matching expected data.
 */
public class AssertingByteBuffer extends ByteBuffer {

  public AssertingByteBuffer(byte[] expectedData) {
    super(expectedData);
  }

  private void assertEquals(int expected, int actual) {
    if (expected != actual)
      throw new RuntimeException("Expected value does not match actual value. Expected value: " + expected + ", actual value: " + actual + ", buf: "+this+".");
  }

  @Override
  public void writeByte(int b) {
    if(b<0)
      throw new RuntimeException();
    //*DEBUG*/System.out.println("WriteByte: "+b+", cursor:"+cursor+".");
    assertEquals(readUnsignedByte(), b&0xff);
  }

  @Override
  public void writeShort(int x) {
    //*DEBUG*/System.out.println("WriteShort: "+x+", cursor:"+cursor+".");
    assertEquals(readUnsignedShort(), x&0xFFff);
  }

  @Override
  public void writeShortLE(int x) {
    //*DEBUG*/System.out.println("WriteShortLE: "+x+", cursor:"+cursor+".");
    assertEquals(readUnsignedShortLE(), x&0xFFff);
  }

  @Override
  public void writeInt(int i) {
    //*DEBUG*/System.out.println("WriteInt: "+i+", cursor:"+cursor+".");
    assertEquals(readSignedInt(), i);
  }

  @Override
  public void writeIntLE(int i) {
    //*DEBUG*/System.out.println("WriteIntLE: "+i+", cursor:"+cursor+".");
    assertEquals(readSignedIntLE(), i);
  }

  @Override
  public void writeVariableIntLE(int i) {
    //*DEBUG*/System.out.println("WriteVariableIntLE: "+i+", cursor:"+cursor+".");
    assertEquals(readVariableSignedIntLE(), i);
  }

  @Override
  public void writeString(String actual, Charset charset) {
    //*DEBUG*/System.out.println("WriteString: "+actual+", cursor:"+cursor+".");
    String expected = readString(actual.length(), charset);
    if (!actual.equals(expected))
      throw new RuntimeException("Expected value does not match actual value. Expected value: " + expected + ", actual value: " + actual + ".");
  }

  @Override
  public void writeBytes(ByteBuffer actual) {
    //*DEBUG*/System.out.println("WriteString: "+actual+", cursor:"+cursor+".");
    ByteBuffer expected = readBytes(actual.length);
    if (!actual.equals(expected))
      throw new RuntimeException("Expected value does not match actual value. Expected value: " + expected + ", actual value: " + actual + ".");
  }

  @Override
  public void writeBytes(byte[] actualData) {
    ByteBuffer actual = new ByteBuffer(actualData);
    //*DEBUG*/System.out.println("WriteString: "+actual+", cursor:"+cursor+".");
    ByteBuffer expected = readBytes(actual.length);
    if (!actual.equals(expected))
      throw new RuntimeException("Expected value does not match actual value. Expected value: " + expected + ", actual value: " + actual + ".");
  }

  @Override
  public void writeBytes(byte[] actualData, int offset, int length) {
    ByteBuffer actual = new ByteBuffer(actualData, offset, length);
    //*DEBUG*/System.out.println("WriteString: "+actual+", cursor:"+cursor+".");
    ByteBuffer expected = readBytes(actual.length);
    if (!actual.equals(expected))
      throw new RuntimeException("Expected value does not match actual value. Expected value: " + expected + ", actual value: " + actual + ".");
  }

}