/*
 * 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.db.query.reader.series;

import org.apache.iotdb.db.engine.querycontext.QueryDataSource;
import org.apache.iotdb.db.query.context.QueryContext;
import org.apache.iotdb.db.query.filter.TsFileFilter;
import org.apache.iotdb.tsfile.file.metadata.enums.TSDataType;
import org.apache.iotdb.tsfile.file.metadata.statistics.Statistics;
import org.apache.iotdb.tsfile.read.common.BatchData;
import org.apache.iotdb.tsfile.read.common.Path;
import org.apache.iotdb.tsfile.read.filter.basic.Filter;

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


public class SeriesAggregateReader implements IAggregateReader {

  private final SeriesReader seriesReader;

  public SeriesAggregateReader(Path seriesPath, Set<String> allSensors,  TSDataType dataType,
      QueryContext context, QueryDataSource dataSource, Filter timeFilter, Filter valueFilter,
      TsFileFilter fileFilter) {
    this.seriesReader = new SeriesReader(seriesPath, allSensors, dataType, context, dataSource,
        timeFilter, valueFilter, fileFilter);
  }

  @Override
  public boolean hasNextFile() throws IOException {
    return seriesReader.hasNextFile();
  }

  @Override
  public boolean canUseCurrentFileStatistics() throws IOException {
    Statistics fileStatistics = currentFileStatistics();
    return !seriesReader.isFileOverlapped() && containedByTimeFilter(fileStatistics)
        && !seriesReader.currentFileModified();
  }

  @Override
  public Statistics currentFileStatistics() throws IOException {
    return seriesReader.currentFileStatistics();
  }

  @Override
  public void skipCurrentFile() {
    seriesReader.skipCurrentFile();
  }

  @Override
  public boolean hasNextChunk() throws IOException {
    return seriesReader.hasNextChunk();
  }

  @Override
  public boolean canUseCurrentChunkStatistics() throws IOException {
    Statistics chunkStatistics = currentChunkStatistics();
    return !seriesReader.isChunkOverlapped() && containedByTimeFilter(chunkStatistics)
        && !seriesReader.currentChunkModified();
  }

  @Override
  public Statistics currentChunkStatistics() {
    return seriesReader.currentChunkStatistics();
  }

  @Override
  public void skipCurrentChunk() {
    seriesReader.skipCurrentChunk();
  }

  @Override
  public boolean hasNextPage() throws IOException {
    return seriesReader.hasNextPage();
  }

  @Override
  public boolean canUseCurrentPageStatistics() throws IOException {
    Statistics currentPageStatistics = currentPageStatistics();
    if (currentPageStatistics == null) {
      return false;
    }
    return !seriesReader.isPageOverlapped() && containedByTimeFilter(currentPageStatistics)
        && !seriesReader.currentPageModified();
  }

  @Override
  public Statistics currentPageStatistics() {
    return seriesReader.currentPageStatistics();
  }

  @Override
  public void skipCurrentPage() {
    seriesReader.skipCurrentPage();
  }

  @Override
  public BatchData nextPage() throws IOException {
    return seriesReader.nextPage();
  }

  private boolean containedByTimeFilter(Statistics statistics) {
    Filter timeFilter = seriesReader.getTimeFilter();
    return timeFilter == null
        || timeFilter.containStartEndTime(statistics.getStartTime(), statistics.getEndTime());
  }
}
