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/**
 * 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.hadoop.hbase.client;

import java.io.IOException;
import java.util.ArrayList;
import java.util.Iterator;
import java.util.List;
import java.util.concurrent.CompletableFuture;
import java.util.stream.Collectors;
import java.util.stream.Stream;

import org.apache.hadoop.conf.Configuration;
import org.apache.hadoop.hbase.TableName;
import org.apache.yetus.audience.InterfaceAudience;

/**
 * The implementation of {@link AsyncBufferedMutator}. Simply wrap an {@link AsyncTable}.
 */
@InterfaceAudience.Private
class AsyncBufferedMutatorImpl implements AsyncBufferedMutator {

  private final AsyncTable table;

  private final long writeBufferSize;

  private List mutations = new ArrayList<>();

  private List> futures = new ArrayList<>();

  private long bufferedSize;

  private boolean closed;

  AsyncBufferedMutatorImpl(AsyncTable table, long writeBufferSize) {
    this.table = table;
    this.writeBufferSize = writeBufferSize;
  }

  @Override
  public TableName getName() {
    return table.getName();
  }

  @Override
  public Configuration getConfiguration() {
    return table.getConfiguration();
  }

  private void internalFlush() {
    List toSend = this.mutations;
    if (toSend.isEmpty()) {
      return;
    }
    List> toComplete = this.futures;
    assert toSend.size() == toComplete.size();
    this.mutations = new ArrayList<>();
    this.futures = new ArrayList<>();
    bufferedSize = 0L;
    Iterator> toCompleteIter = toComplete.iterator();
    for (CompletableFuture future : table.batch(toSend)) {
      CompletableFuture toCompleteFuture = toCompleteIter.next();
      future.whenComplete((r, e) -> {
        if (e != null) {
          toCompleteFuture.completeExceptionally(e);
        } else {
          toCompleteFuture.complete(null);
        }
      });
    }
  }

  @Override
  public CompletableFuture mutate(Mutation mutation) {
    CompletableFuture future = new CompletableFuture();
    long heapSize = mutation.heapSize();
    synchronized (this) {
      if (closed) {
        future.completeExceptionally(new IOException("Already closed"));
        return future;
      }
      mutations.add(mutation);
      futures.add(future);
      bufferedSize += heapSize;
      if (bufferedSize >= writeBufferSize) {
        internalFlush();
      }
    }
    return future;
  }

  @Override
  public List> mutate(List mutations) {
    List> futures =
        Stream.> generate(CompletableFuture::new).limit(mutations.size())
            .collect(Collectors.toList());
    long heapSize = mutations.stream().mapToLong(m -> m.heapSize()).sum();
    synchronized (this) {
      if (closed) {
        IOException ioe = new IOException("Already closed");
        futures.forEach(f -> f.completeExceptionally(ioe));
        return futures;
      }
      this.mutations.addAll(mutations);
      this.futures.addAll(futures);
      bufferedSize += heapSize;
      if (bufferedSize >= writeBufferSize) {
        internalFlush();
      }
    }
    return futures;
  }

  @Override
  public synchronized void flush() {
    internalFlush();
  }

  @Override
  public synchronized void close() {
    internalFlush();
    closed = true;
  }

  @Override
  public long getWriteBufferSize() {
    return writeBufferSize;
  }
}