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/*
 * Copyright 2011 - 2015 Metamarkets Group Inc.
 *
 * Licensed 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 com.metamx.collections.bitmap;

import com.google.common.base.Throwables;
import org.roaringbitmap.IntIterator;
import org.roaringbitmap.buffer.ImmutableRoaringBitmap;

import java.io.ByteArrayOutputStream;
import java.io.DataOutputStream;
import java.nio.ByteBuffer;

public class WrappedImmutableRoaringBitmap implements ImmutableBitmap
{
  /**
   * Underlying bitmap.
   */
  private final ImmutableRoaringBitmap bitmap;

  protected WrappedImmutableRoaringBitmap(ByteBuffer byteBuffer)
  {
    this.bitmap = new ImmutableRoaringBitmap(byteBuffer.asReadOnlyBuffer());
  }

  /**
   * Wrap an ImmutableRoaringBitmap
   *
   * @param immutableRoaringBitmap bitmap to be wrapped
   */
  public WrappedImmutableRoaringBitmap(ImmutableRoaringBitmap immutableRoaringBitmap)
  {
    this.bitmap = immutableRoaringBitmap;
  }

  public ImmutableRoaringBitmap getBitmap()
  {
    return bitmap;
  }

  @Override
  public byte[] toBytes()
  {
    try {
      final ByteArrayOutputStream out = new ByteArrayOutputStream();
      bitmap.serialize(new DataOutputStream(out));
      return out.toByteArray();
    }
    catch (Exception e) {
      throw Throwables.propagate(e);
    }
  }

  @Override
  public int compareTo(ImmutableBitmap other)
  {
    return 0;
  }

  @Override
  public String toString()
  {
    return getClass().getSimpleName() + bitmap.toString();
  }

  @Override
  public IntIterator iterator()
  {
    return bitmap.getIntIterator();
  }

  @Override
  public int size()
  {
    return bitmap.getCardinality();
  }

  @Override
  public boolean isEmpty()
  {
    return bitmap.isEmpty();
  }

  @Override
  public ImmutableBitmap union(ImmutableBitmap otherBitmap)
  {
    WrappedImmutableRoaringBitmap other = (WrappedImmutableRoaringBitmap) otherBitmap;
    ImmutableRoaringBitmap unwrappedOtherBitmap = other.bitmap;
    return new WrappedImmutableRoaringBitmap(ImmutableRoaringBitmap.or(bitmap, unwrappedOtherBitmap));
  }

  @Override
  public boolean get(int value)
  {
    return bitmap.contains(value);
  }

  @Override
  public ImmutableBitmap intersection(ImmutableBitmap otherBitmap)
  {
    WrappedImmutableRoaringBitmap other = (WrappedImmutableRoaringBitmap) otherBitmap;
    ImmutableRoaringBitmap unwrappedOtherBitmap = other.bitmap;
    return new WrappedImmutableRoaringBitmap(ImmutableRoaringBitmap.and(bitmap, unwrappedOtherBitmap));
  }

  @Override
  public ImmutableBitmap difference(ImmutableBitmap otherBitmap)
  {
    WrappedImmutableRoaringBitmap other = (WrappedImmutableRoaringBitmap) otherBitmap;
    ImmutableRoaringBitmap unwrappedOtherBitmap = other.bitmap;
    return new WrappedImmutableRoaringBitmap(ImmutableRoaringBitmap.andNot(bitmap, unwrappedOtherBitmap));
  }
}