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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.pinot.plugin.stream.kafka20;

import com.google.common.base.Preconditions;
import java.io.IOException;
import java.time.Duration;
import java.util.Collections;
import java.util.concurrent.TimeoutException;
import javax.annotation.Nonnull;
import org.apache.pinot.spi.stream.LongMsgOffset;
import org.apache.pinot.spi.stream.OffsetCriteria;
import org.apache.pinot.spi.stream.StreamConfig;
import org.apache.pinot.spi.stream.StreamMetadataProvider;
import org.apache.pinot.spi.stream.StreamPartitionMsgOffset;


public class KafkaStreamMetadataProvider extends KafkaPartitionLevelConnectionHandler implements StreamMetadataProvider {

  public KafkaStreamMetadataProvider(String clientId, StreamConfig streamConfig) {
    this(clientId, streamConfig, Integer.MIN_VALUE);
  }

  public KafkaStreamMetadataProvider(String clientId, StreamConfig streamConfig, int partition) {
    super(clientId, streamConfig, partition);
  }

  @Override
  public int fetchPartitionCount(long timeoutMillis) {
    return _consumer.partitionsFor(_topic, Duration.ofMillis(timeoutMillis)).size();
  }

  public synchronized long fetchPartitionOffset(@Nonnull OffsetCriteria offsetCriteria, long timeoutMillis)
      throws java.util.concurrent.TimeoutException {
    throw new UnsupportedOperationException("The use of this method is not supported");
  }

  @Override
  public StreamPartitionMsgOffset fetchStreamPartitionOffset(@Nonnull OffsetCriteria offsetCriteria, long timeoutMillis)
      throws TimeoutException {
    Preconditions.checkNotNull(offsetCriteria);
    long offset = -1;
    if (offsetCriteria.isLargest()) {
      offset =  _consumer.endOffsets(Collections.singletonList(_topicPartition), Duration.ofMillis(timeoutMillis))
          .get(_topicPartition);
    } else if (offsetCriteria.isSmallest()) {
      offset =  _consumer.beginningOffsets(Collections.singletonList(_topicPartition), Duration.ofMillis(timeoutMillis))
          .get(_topicPartition);
    } else {
      throw new IllegalArgumentException("Unknown initial offset value " + offsetCriteria.toString());
    }
    return new LongMsgOffset(offset);
  }

  @Override
  public void close()
      throws IOException {
    super.close();
  }
}