/*
 * 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.storageengine.dataregion.compaction.utils;

import org.apache.iotdb.commons.conf.IoTDBConstant;
import org.apache.iotdb.db.conf.IoTDBDescriptor;
import org.apache.iotdb.db.storageengine.buffer.BloomFilterCache;
import org.apache.iotdb.db.storageengine.buffer.ChunkCache;
import org.apache.iotdb.db.storageengine.buffer.TimeSeriesMetadataCache;
import org.apache.iotdb.db.storageengine.dataregion.compaction.execute.utils.log.CompactionLogger;
import org.apache.iotdb.db.storageengine.dataregion.modification.ModificationFile;
import org.apache.iotdb.db.storageengine.dataregion.read.control.FileReaderManager;
import org.apache.iotdb.db.storageengine.dataregion.tsfile.TsFileResource;
import org.apache.iotdb.tsfile.common.constant.TsFileConstant;
import org.apache.iotdb.tsfile.fileSystem.FSFactoryProducer;

import org.apache.commons.io.FileUtils;

import java.io.File;
import java.io.IOException;

public class CompactionClearUtils {

  /** Clear all generated and merged files in the test directory */
  public static void clearAllCompactionFiles() throws IOException {
    FileReaderManager.getInstance().closeAndRemoveAllOpenedReaders();
    deleteAllFilesInOneDirBySuffix("target", TsFileConstant.TSFILE_SUFFIX);
    deleteAllFilesInOneDirBySuffix("target", TsFileResource.RESOURCE_SUFFIX);
    deleteAllFilesInOneDirBySuffix("target", ModificationFile.FILE_SUFFIX);
    deleteAllFilesInOneDirBySuffix("target", IoTDBConstant.INNER_COMPACTION_TMP_FILE_SUFFIX);
    deleteAllFilesInOneDirBySuffix("target", IoTDBConstant.CROSS_COMPACTION_TMP_FILE_SUFFIX);
    deleteAllFilesInOneDirBySuffix("target", CompactionLogger.INNER_COMPACTION_LOG_NAME_SUFFIX);
    deleteAllFilesInOneDirBySuffix("target", CompactionLogger.CROSS_COMPACTION_LOG_NAME_SUFFIX);
    // clean cache
    if (IoTDBDescriptor.getInstance().getConfig().isMetaDataCacheEnable()) {
      ChunkCache.getInstance().clear();
      TimeSeriesMetadataCache.getInstance().clear();
      BloomFilterCache.getInstance().clear();
    }
    FileReaderManager.getInstance().closeAndRemoveAllOpenedReaders();
  }

  private static void deleteAllFilesInOneDirBySuffix(String dirPath, String suffix)
      throws IOException {
    File dir = new File(dirPath);
    if (!dir.isDirectory()) {
      return;
    }
    if (!dir.exists()) {
      return;
    }
    for (File f : FSFactoryProducer.getFSFactory().listFilesBySuffix(dirPath, suffix)) {
      FileUtils.delete(f);
    }
    File[] tmpFiles = dir.listFiles();
    if (tmpFiles != null) {
      for (File f : tmpFiles) {
        if (f.isDirectory()) {
          deleteAllFilesInOneDirBySuffix(f.getAbsolutePath(), suffix);
        }
      }
    }
  }

  public static void deleteEmptyDir(File dir) {
    if (!dir.isDirectory()) {
      return;
    }
    for (File f : dir.listFiles()) {
      deleteEmptyDir(f);
    }
    dir.delete();
  }
}
