/*
 * 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.pipe.event.common.terminate;

import org.apache.iotdb.commons.concurrent.IoTThreadFactory;
import org.apache.iotdb.commons.concurrent.ThreadName;
import org.apache.iotdb.commons.concurrent.threadpool.WrappedThreadPoolExecutor;
import org.apache.iotdb.commons.consensus.index.ProgressIndex;
import org.apache.iotdb.commons.consensus.index.impl.MinimumProgressIndex;
import org.apache.iotdb.commons.pipe.agent.task.meta.PipeTaskMeta;
import org.apache.iotdb.commons.pipe.datastructure.pattern.PipePattern;
import org.apache.iotdb.commons.pipe.event.EnrichedEvent;
import org.apache.iotdb.db.conf.IoTDBDescriptor;
import org.apache.iotdb.db.pipe.agent.PipeDataNodeAgent;
import org.apache.iotdb.db.pipe.agent.task.PipeDataNodeTask;
import org.apache.iotdb.db.pipe.event.common.tsfile.PipeTsFileInsertionEvent;

import java.util.concurrent.ArrayBlockingQueue;
import java.util.concurrent.ExecutorService;
import java.util.concurrent.TimeUnit;

/**
 * The {@link PipeTerminateEvent} is an {@link EnrichedEvent} that controls the termination of pipe,
 * that is, when the historical {@link PipeTsFileInsertionEvent}s are all processed, this will be
 * reported next and mark the {@link PipeDataNodeTask} as completed. WARNING: This event shall never
 * be discarded.
 */
public class PipeTerminateEvent extends EnrichedEvent {

  private final int dataRegionId;

  private final boolean shouldMark;

  // Do not use call run policy to avoid deadlock
  private static final ExecutorService terminateExecutor =
      new WrappedThreadPoolExecutor(
          0,
          IoTDBDescriptor.getInstance().getConfig().getPipeTaskThreadCount(),
          0L,
          TimeUnit.SECONDS,
          new ArrayBlockingQueue<>(
              IoTDBDescriptor.getInstance().getConfig().getPipeTaskThreadCount()),
          new IoTThreadFactory(ThreadName.PIPE_TERMINATE_EXECUTION_POOL.getName()),
          ThreadName.PIPE_TERMINATE_EXECUTION_POOL.getName());

  public PipeTerminateEvent(
      final String pipeName,
      final long creationTime,
      final PipeTaskMeta pipeTaskMeta,
      final int dataRegionId,
      final boolean shouldMark) {
    super(pipeName, creationTime, pipeTaskMeta, null, Long.MIN_VALUE, Long.MAX_VALUE);
    this.dataRegionId = dataRegionId;
    this.shouldMark = shouldMark;

    addOnCommittedHook(this::markCompleted);
  }

  @Override
  public boolean internallyIncreaseResourceReferenceCount(final String holderMessage) {
    return true;
  }

  @Override
  public boolean internallyDecreaseResourceReferenceCount(final String holderMessage) {
    return true;
  }

  @Override
  public ProgressIndex getProgressIndex() {
    return MinimumProgressIndex.INSTANCE;
  }

  @Override
  public EnrichedEvent shallowCopySelfAndBindPipeTaskMetaForProgressReport(
      final String pipeName,
      final long creationTime,
      final PipeTaskMeta pipeTaskMeta,
      final PipePattern pattern,
      final long startTime,
      final long endTime) {
    // Should record PipeTaskMeta, for the terminateEvent shall report progress to
    // notify the pipeTask it's completed.
    return new PipeTerminateEvent(pipeName, creationTime, pipeTaskMeta, dataRegionId, shouldMark);
  }

  @Override
  public boolean isGeneratedByPipe() {
    return false;
  }

  @Override
  public boolean mayEventTimeOverlappedWithTimeRange() {
    return true;
  }

  @Override
  public boolean mayEventPathsOverlappedWithPattern() {
    return true;
  }

  public void markCompleted() {
    // To avoid deadlock
    if (shouldMark) {
      terminateExecutor.submit(
          () -> PipeDataNodeAgent.task().markCompleted(pipeName, dataRegionId));
    }
  }

  @Override
  public String toString() {
    return String.format(
            "PipeTerminateEvent{dataRegionId=%s, shouldMark=%s}", dataRegionId, shouldMark)
        + " - "
        + super.toString();
  }
}
