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/*
 * Copyright (c) 2019 by Andrew Charneski.
 *
 * The author 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 com.simiacryptus.util.io;

import com.simiacryptus.ref.lang.RefAware;
import com.simiacryptus.ref.wrappers.*;
import com.simiacryptus.util.Util;

import javax.annotation.Nonnull;
import java.io.DataInputStream;
import java.io.IOException;
import java.util.Spliterator;

public final class BinaryChunkIterator extends RefIteratorBase {

  private final DataInputStream in;
  private final int recordSize;

  public BinaryChunkIterator(final DataInputStream in, final int recordSize) {
    super();
    this.in = in;
    this.recordSize = recordSize;
  }

  public static  RefStream toIterator(@Nonnull final RefIterator iterator) {
    return RefStreamSupport
        .stream(RefSpliterators.spliterator(iterator, 1, Spliterator.ORDERED), false);
  }

  public static  RefStream toStream(@Nonnull final RefIteratorBase iterator) {
    return BinaryChunkIterator.toStream(iterator, 0);
  }

  public static  RefStream toStream(@Nonnull final @RefAware RefIteratorBase iterator, final int size) {
    return BinaryChunkIterator.toStream(iterator, size, false);
  }

  public static  RefStream toStream(@Nonnull final @RefAware RefIteratorBase iterator, final int size,
                                          final boolean parallel) {
    return RefStreamSupport
        .stream(RefSpliterators.spliterator(iterator, size, Spliterator.ORDERED), parallel);
  }

  @Nonnull
  private static byte[] read(@Nonnull final DataInputStream i, final int s) throws IOException {
    @Nonnull final byte[] b = new byte[s];
    int pos = 0;
    while (b.length > pos) {
      final int read = i.read(b, pos, b.length - pos);
      if (0 == read) {
        throw new RuntimeException();
      }
      pos += read;
    }
    return b;
  }

  @Override
  public boolean hasNext() {
    try {
      return 0 < in.available();
    } catch (@Nonnull final Throwable e) {
      return false;
    }
  }

  @Nonnull
  @Override
  public byte[] next() {
    assert hasNext();
    try {
      return BinaryChunkIterator.read(in, recordSize);
    } catch (@Nonnull final IOException e) {
      throw Util.throwException(e);
    }
  }

  public RefStream toStream() {
    return BinaryChunkIterator.toStream(this.addRef());
  }

  public @SuppressWarnings("unused")
  void _free() {
    super._free();
  }

  @Nonnull
  public @Override
  @SuppressWarnings("unused")
  BinaryChunkIterator addRef() {
    return (BinaryChunkIterator) super.addRef();
  }
}