/*
 * 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.iotdb.cluster.query.fill;

import org.apache.iotdb.cluster.query.reader.ClusterReaderFactory;
import org.apache.iotdb.cluster.server.member.MetaGroupMember;
import org.apache.iotdb.db.exception.StorageEngineException;
import org.apache.iotdb.db.exception.query.QueryProcessException;
import org.apache.iotdb.db.metadata.PartialPath;
import org.apache.iotdb.db.qp.physical.crud.FillQueryPlan;
import org.apache.iotdb.db.query.context.QueryContext;
import org.apache.iotdb.db.query.executor.FillQueryExecutor;
import org.apache.iotdb.db.query.executor.fill.IFill;
import org.apache.iotdb.db.query.executor.fill.LinearFill;
import org.apache.iotdb.db.query.executor.fill.PreviousFill;
import org.apache.iotdb.db.query.reader.series.IReaderByTimestamp;
import org.apache.iotdb.tsfile.file.metadata.enums.TSDataType;
import org.apache.iotdb.tsfile.read.TimeValuePair;
import org.apache.iotdb.tsfile.utils.TsPrimitiveType;

import java.io.IOException;
import java.util.ArrayList;
import java.util.List;
import java.util.Set;

public class ClusterFillExecutor extends FillQueryExecutor {

  private MetaGroupMember metaGroupMember;
  private ClusterReaderFactory clusterReaderFactory;

  public ClusterFillExecutor(FillQueryPlan plan, MetaGroupMember metaGroupMember) {
    super(plan);
    this.metaGroupMember = metaGroupMember;
    this.clusterReaderFactory = new ClusterReaderFactory(metaGroupMember);
  }

  @Override
  protected IFill configureFill(
      IFill fill,
      PartialPath path,
      TSDataType dataType,
      long queryTime,
      Set<String> deviceMeasurements,
      QueryContext context)
      throws QueryProcessException, StorageEngineException {
    if (fill instanceof LinearFill) {
      IFill clusterFill = new ClusterLinearFill((LinearFill) fill, metaGroupMember);
      clusterFill.configureFill(path, dataType, queryTime, deviceMeasurements, context);
      return clusterFill;
    } else if (fill instanceof PreviousFill) {
      IFill clusterFill = new ClusterPreviousFill((PreviousFill) fill, metaGroupMember);
      clusterFill.configureFill(path, dataType, queryTime, deviceMeasurements, context);
      return clusterFill;
    } else {
      fill.configureFill(path, dataType, queryTime, deviceMeasurements, context);
      return fill;
    }
  }

  @Override
  protected List<TimeValuePair> getTimeValuePairs(QueryContext context)
      throws QueryProcessException, StorageEngineException, IOException {
    List<TimeValuePair> ret = new ArrayList<>(selectedSeries.size());

    for (int i = 0; i < selectedSeries.size(); i++) {
      PartialPath path = selectedSeries.get(i);
      TSDataType dataType = dataTypes.get(i);
      IReaderByTimestamp reader =
          clusterReaderFactory.getReaderByTimestamp(
              path,
              plan.getAllMeasurementsInDevice(path.getDevice()),
              dataTypes.get(i),
              context,
              plan.isAscending());

      Object[] results = reader.getValuesInTimestamps(new long[] {queryTime}, 1);
      if (results != null && results[0] != null) {
        ret.add(new TimeValuePair(queryTime, TsPrimitiveType.getByType(dataType, results[0])));
      } else {
        ret.add(null);
      }
    }

    return ret;
  }
}
