/*
 * 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.lucene.codecs.blocktreeords;

import java.io.IOException;
import org.apache.lucene.codecs.FieldsConsumer;
import org.apache.lucene.codecs.FieldsProducer;
import org.apache.lucene.codecs.PostingsFormat;
import org.apache.lucene.codecs.PostingsReaderBase;
import org.apache.lucene.codecs.PostingsWriterBase;
import org.apache.lucene.codecs.lucene90.Lucene90PostingsReader;
import org.apache.lucene.codecs.lucene90.Lucene90PostingsWriter;
import org.apache.lucene.codecs.lucene90.blocktree.Lucene90BlockTreeTermsWriter;
import org.apache.lucene.index.SegmentReadState;
import org.apache.lucene.index.SegmentWriteState;
import org.apache.lucene.util.IOUtils;

/** Uses {@link OrdsBlockTreeTermsWriter} with {@link Lucene90PostingsWriter}. */
public class BlockTreeOrdsPostingsFormat extends PostingsFormat {

  private final int minTermBlockSize;
  private final int maxTermBlockSize;

  /** Fixed packed block size, number of integers encoded in a single packed block. */
  // NOTE: must be multiple of 64 because of PackedInts long-aligned encoding/decoding
  public static final int BLOCK_SIZE = 128;

  /** Creates {@code Lucene41PostingsFormat} with default settings. */
  public BlockTreeOrdsPostingsFormat() {
    this(
        OrdsBlockTreeTermsWriter.DEFAULT_MIN_BLOCK_SIZE,
        OrdsBlockTreeTermsWriter.DEFAULT_MAX_BLOCK_SIZE);
  }

  /**
   * Creates {@code Lucene41PostingsFormat} with custom values for {@code minBlockSize} and {@code
   * maxBlockSize} passed to block terms dictionary.
   *
   * @see
   *     OrdsBlockTreeTermsWriter#OrdsBlockTreeTermsWriter(SegmentWriteState,PostingsWriterBase,int,int)
   */
  public BlockTreeOrdsPostingsFormat(int minTermBlockSize, int maxTermBlockSize) {
    super("BlockTreeOrds");
    this.minTermBlockSize = minTermBlockSize;
    this.maxTermBlockSize = maxTermBlockSize;
    Lucene90BlockTreeTermsWriter.validateSettings(minTermBlockSize, maxTermBlockSize);
  }

  @Override
  public String toString() {
    return getName() + "(blocksize=" + BLOCK_SIZE + ")";
  }

  @Override
  public FieldsConsumer fieldsConsumer(SegmentWriteState state) throws IOException {
    PostingsWriterBase postingsWriter = new Lucene90PostingsWriter(state);

    boolean success = false;
    try {
      FieldsConsumer ret =
          new OrdsBlockTreeTermsWriter(state, postingsWriter, minTermBlockSize, maxTermBlockSize);
      success = true;
      return ret;
    } finally {
      if (!success) {
        IOUtils.closeWhileHandlingException(postingsWriter);
      }
    }
  }

  @Override
  public FieldsProducer fieldsProducer(SegmentReadState state) throws IOException {
    PostingsReaderBase postingsReader = new Lucene90PostingsReader(state);
    boolean success = false;
    try {
      FieldsProducer ret = new OrdsBlockTreeTermsReader(postingsReader, state);
      success = true;
      return ret;
    } finally {
      if (!success) {
        IOUtils.closeWhileHandlingException(postingsReader);
      }
    }
  }
}
