/*
 * 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.engine.memtable;

import org.apache.iotdb.commons.path.AlignedPath;
import org.apache.iotdb.commons.path.PartialPath;
import org.apache.iotdb.db.wal.buffer.IWALByteBufferView;
import org.apache.iotdb.tsfile.utils.BitMap;
import org.apache.iotdb.tsfile.utils.Pair;
import org.apache.iotdb.tsfile.write.schema.IMeasurementSchema;

import java.io.DataInputStream;
import java.io.IOException;
import java.util.ArrayList;
import java.util.Collections;
import java.util.List;
import java.util.Map;
import java.util.Set;

import static org.apache.iotdb.commons.conf.IoTDBConstant.MULTI_LEVEL_PATH_WILDCARD;
import static org.apache.iotdb.commons.conf.IoTDBConstant.ONE_LEVEL_PATH_WILDCARD;

public class AlignedWritableMemChunkGroup implements IWritableMemChunkGroup {

  private AlignedWritableMemChunk memChunk;

  public AlignedWritableMemChunkGroup(List<IMeasurementSchema> schemaList) {
    memChunk = new AlignedWritableMemChunk(schemaList);
  }

  private AlignedWritableMemChunkGroup() {}

  @Override
  public boolean writeValuesWithFlushCheck(
      long[] times,
      Object[] columns,
      BitMap[] bitMaps,
      List<IMeasurementSchema> schemaList,
      int start,
      int end) {
    return memChunk.writeAlignedValuesWithFlushCheck(
        times, columns, bitMaps, schemaList, start, end);
  }

  @Override
  public void release() {
    memChunk.release();
  }

  @Override
  public long count() {
    return memChunk.count();
  }

  /**
   * Check whether this MemChunkGroup contains a measurement. If a VECTOR_PLACEHOLDER passed from
   * outer, always return true because AlignedMemChunkGroup existing.
   */
  @Override
  public boolean contains(String measurement) {
    // used for calculate memtable size
    if (AlignedPath.VECTOR_PLACEHOLDER.equals(measurement)) {
      return true;
    }
    return memChunk.containsMeasurement(measurement);
  }

  @Override
  public boolean writeWithFlushCheck(
      long insertTime, Object[] objectValue, List<IMeasurementSchema> schemaList) {
    return memChunk.writeAlignedValueWithFlushCheck(insertTime, objectValue, schemaList);
  }

  @Override
  public Map<String, IWritableMemChunk> getMemChunkMap() {
    if (memChunk.count() == 0) {
      return Collections.emptyMap();
    }
    return Collections.singletonMap("", memChunk);
  }

  @Override
  public int delete(
      PartialPath originalPath, PartialPath devicePath, long startTimestamp, long endTimestamp) {
    int deletedPointsNumber = 0;
    Set<String> measurements = memChunk.getAllMeasurements();
    List<String> columnsToBeRemoved = new ArrayList<>();
    String targetMeasurement = originalPath.getMeasurement();
    if (targetMeasurement.equals(ONE_LEVEL_PATH_WILDCARD)
        || targetMeasurement.equals(MULTI_LEVEL_PATH_WILDCARD)) {
      for (String measurement : measurements) {
        Pair<Integer, Boolean> deleteInfo =
            memChunk.deleteDataFromAColumn(startTimestamp, endTimestamp, measurement);
        deletedPointsNumber += deleteInfo.left;
        if (Boolean.TRUE.equals(deleteInfo.right)) {
          columnsToBeRemoved.add(measurement);
        }
      }
    } else {
      if (measurements.contains(targetMeasurement)) {
        Pair<Integer, Boolean> deleteInfo =
            memChunk.deleteDataFromAColumn(startTimestamp, endTimestamp, targetMeasurement);
        deletedPointsNumber += deleteInfo.left;
        if (Boolean.TRUE.equals(deleteInfo.right)) {
          columnsToBeRemoved.add(targetMeasurement);
        }
      }
    }

    for (String columnToBeRemoved : columnsToBeRemoved) {
      memChunk.removeColumn(columnToBeRemoved);
    }
    return deletedPointsNumber;
  }

  @Override
  public long getCurrentTVListSize(String measurement) {
    return memChunk.getTVList().rowCount();
  }

  @Override
  public long getMaxTime() {
    return memChunk.getMaxTime();
  }

  public AlignedWritableMemChunk getAlignedMemChunk() {
    return memChunk;
  }

  @Override
  public int serializedSize() {
    return memChunk.serializedSize();
  }

  @Override
  public void serializeToWAL(IWALByteBufferView buffer) {
    memChunk.serializeToWAL(buffer);
  }

  public static AlignedWritableMemChunkGroup deserialize(DataInputStream stream)
      throws IOException {
    AlignedWritableMemChunkGroup memChunkGroup = new AlignedWritableMemChunkGroup();
    memChunkGroup.memChunk = AlignedWritableMemChunk.deserialize(stream);
    return memChunkGroup;
  }
}
