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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.hudi.io.hadoop;

import org.apache.hudi.common.bloom.BloomFilter;
import org.apache.hudi.common.model.HoodieFileFormat;
import org.apache.hudi.common.util.AvroOrcUtils;
import org.apache.hudi.common.util.FileFormatUtils;
import org.apache.hudi.common.util.collection.ClosableIterator;
import org.apache.hudi.common.util.collection.Pair;
import org.apache.hudi.exception.HoodieIOException;
import org.apache.hudi.io.storage.HoodieAvroFileReader;
import org.apache.hudi.io.storage.HoodieFileReader;
import org.apache.hudi.io.storage.HoodieIOFactory;
import org.apache.hudi.storage.HoodieStorage;
import org.apache.hudi.storage.StoragePath;

import org.apache.avro.Schema;
import org.apache.avro.generic.IndexedRecord;
import org.apache.hadoop.conf.Configuration;
import org.apache.hadoop.fs.Path;
import org.apache.orc.OrcFile;
import org.apache.orc.Reader;
import org.apache.orc.Reader.Options;
import org.apache.orc.RecordReader;
import org.apache.orc.TypeDescription;

import java.io.IOException;
import java.util.Iterator;
import java.util.Objects;
import java.util.Set;

/**
 * {@link HoodieFileReader} implementation for ORC format.
 */
public class HoodieAvroOrcReader extends HoodieAvroFileReader {

  private final StoragePath path;
  private final HoodieStorage storage;
  private final FileFormatUtils orcUtils;

  public HoodieAvroOrcReader(HoodieStorage storage, StoragePath path) {
    this.storage = storage;
    this.path = path;
    this.orcUtils = HoodieIOFactory.getIOFactory(storage).getFileFormatUtils(HoodieFileFormat.ORC);
  }

  @Override
  public String[] readMinMaxRecordKeys() {
    return orcUtils.readMinMaxRecordKeys(storage, path);
  }

  @Override
  public BloomFilter readBloomFilter() {
    return orcUtils.readBloomFilterFromMetadata(storage, path);
  }

  @Override
  public Set> filterRowKeys(Set candidateRowKeys) {
    return orcUtils.filterRowKeys(storage, path, candidateRowKeys);
  }

  @Override
  public ClosableIterator getIndexedRecordIterator(Schema readerSchema, Schema requestedSchema) {
    if (!Objects.equals(readerSchema, requestedSchema)) {
      throw new UnsupportedOperationException("Schema projections are not supported in HFile reader");
    }

    Configuration hadoopConf = storage.getConf().unwrapAs(Configuration.class);
    try (Reader reader = OrcFile.createReader(new Path(path.toUri()), OrcFile.readerOptions(hadoopConf))) {
      TypeDescription orcSchema = AvroOrcUtils.createOrcSchema(readerSchema);
      RecordReader recordReader = reader.rows(new Options(hadoopConf).schema(orcSchema));
      return new OrcReaderIterator<>(recordReader, readerSchema, orcSchema);
    } catch (IOException io) {
      throw new HoodieIOException("Unable to create an ORC reader.", io);
    }
  }

  @Override
  public ClosableIterator getRecordKeyIterator() {
    final Iterator iterator = orcUtils.readRowKeys(storage, path).iterator();
    return new ClosableIterator() {
      @Override
      public boolean hasNext() {
        return iterator.hasNext();
      }

      @Override
      public String next() {
        return iterator.next();
      }

      @Override
      public void close() {
      }
    };
  }

  @Override
  public Schema getSchema() {
    return orcUtils.readAvroSchema(storage, path);
  }

  @Override
  public void close() {
  }

  @Override
  public long getTotalRecords() {
    return orcUtils.getRowCount(storage, path);
  }
}