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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.iceberg.connect;

import java.util.Collection;
import java.util.Map;
import org.apache.iceberg.catalog.Catalog;
import org.apache.iceberg.relocated.com.google.common.base.Preconditions;
import org.apache.iceberg.relocated.com.google.common.collect.ImmutableMap;
import org.apache.kafka.clients.consumer.OffsetAndMetadata;
import org.apache.kafka.common.TopicPartition;
import org.apache.kafka.connect.sink.SinkRecord;
import org.apache.kafka.connect.sink.SinkTask;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

public class IcebergSinkTask extends SinkTask {

  private static final Logger LOG = LoggerFactory.getLogger(IcebergSinkTask.class);

  private IcebergSinkConfig config;
  private Catalog catalog;
  private Committer committer;

  @Override
  public String version() {
    return IcebergSinkConfig.version();
  }

  @Override
  public void start(Map props) {
    this.config = new IcebergSinkConfig(props);
  }

  @Override
  public void open(Collection partitions) {
    Preconditions.checkArgument(catalog == null, "Catalog already open");
    Preconditions.checkArgument(committer == null, "Committer already open");

    catalog = CatalogUtils.loadCatalog(config);
    committer = CommitterFactory.createCommitter(config);
    committer.start(catalog, config, context);
  }

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

  private void close() {
    if (committer != null) {
      committer.stop();
      committer = null;
    }

    if (catalog != null) {
      if (catalog instanceof AutoCloseable) {
        try {
          ((AutoCloseable) catalog).close();
        } catch (Exception e) {
          LOG.warn("An error occurred closing catalog instance, ignoring...", e);
        }
      }
      catalog = null;
    }
  }

  @Override
  public void put(Collection sinkRecords) {
    Preconditions.checkNotNull(committer, "Committer wasn't initialized");
    committer.save(sinkRecords);
  }

  @Override
  public void flush(Map currentOffsets) {
    Preconditions.checkNotNull(committer, "Committer wasn't initialized");
    committer.save(null);
  }

  @Override
  public Map preCommit(
      Map currentOffsets) {
    // offset commit is handled by the worker
    return ImmutableMap.of();
  }

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