/*
 * 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.heartbeat;

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.connection.UnboundedBlockingPendingQueue;
import org.apache.iotdb.commons.pipe.agent.task.meta.PipeTaskMeta;
import org.apache.iotdb.commons.pipe.datastructure.pattern.TablePattern;
import org.apache.iotdb.commons.pipe.datastructure.pattern.TreePattern;
import org.apache.iotdb.commons.pipe.event.EnrichedEvent;
import org.apache.iotdb.db.pipe.metric.overview.PipeDataNodeSinglePipeMetrics;
import org.apache.iotdb.db.pipe.metric.overview.PipeHeartbeatEventMetrics;
import org.apache.iotdb.db.pipe.source.dataregion.realtime.disruptor.RingBuffer;
import org.apache.iotdb.db.utils.DateTimeUtils;
import org.apache.iotdb.pipe.api.event.Event;

import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

import java.util.Objects;

public class PipeHeartbeatEvent extends EnrichedEvent {

  private static final Logger LOGGER = LoggerFactory.getLogger(PipeHeartbeatEvent.class);

  private final String dataRegionId;

  private long timePublished;
  private long timeAssigned;
  private long timeProcessed;
  private long timeTransferred;

  // Do not report disruptor tablet or tsFile size separately since
  // The disruptor is usually nearly empty.
  private int disruptorSize;

  private int extractorQueueTabletSize;
  private int extractorQueueTsFileSize;
  private int extractorQueueSize;

  private int connectorQueueTabletSize;
  private int connectorQueueTsFileSize;
  private int connectorQueueSize;

  private final boolean shouldPrintMessage;

  public PipeHeartbeatEvent(final String dataRegionId, final boolean shouldPrintMessage) {
    super(null, 0, null, null, null, null, null, null, true, Long.MIN_VALUE, Long.MAX_VALUE);
    this.dataRegionId = dataRegionId;
    this.shouldPrintMessage = shouldPrintMessage;
  }

  public PipeHeartbeatEvent(
      final String pipeName,
      final long creationTime,
      final PipeTaskMeta pipeTaskMeta,
      final String dataRegionId,
      final long timePublished,
      final boolean shouldPrintMessage) {
    super(
        pipeName,
        creationTime,
        pipeTaskMeta,
        null,
        null,
        null,
        null,
        null,
        true,
        Long.MIN_VALUE,
        Long.MAX_VALUE);
    this.dataRegionId = dataRegionId;
    this.timePublished = timePublished;
    this.shouldPrintMessage = shouldPrintMessage;
  }

  @Override
  public boolean internallyIncreaseResourceReferenceCount(final String holderMessage) {
    if (Objects.nonNull(pipeName)) {
      PipeDataNodeSinglePipeMetrics.getInstance()
          .increaseHeartbeatEventCount(pipeName, creationTime);
    }
    return true;
  }

  @Override
  public boolean internallyDecreaseResourceReferenceCount(final String holderMessage) {
    // PipeName == null indicates that the event is the raw event at disruptor,
    // not the event copied and passed to the extractor
    if (Objects.nonNull(pipeName)) {
      PipeDataNodeSinglePipeMetrics.getInstance()
          .decreaseHeartbeatEventCount(pipeName, creationTime);
      if (shouldPrintMessage && LOGGER.isDebugEnabled()) {
        LOGGER.debug(this.toString());
      }
    }
    return true;
  }

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

  @Override
  public EnrichedEvent shallowCopySelfAndBindPipeTaskMetaForProgressReport(
      final String pipeName,
      final long creationTime,
      final PipeTaskMeta pipeTaskMeta,
      final TreePattern treePattern,
      final TablePattern tablePattern,
      final String userId,
      final String userName,
      final String cliHostname,
      final boolean skipIfNoPrivileges,
      final long startTime,
      final long endTime) {
    // Should record PipeTaskMeta, for sometimes HeartbeatEvents should report exceptions.
    // Here we ignore parameters `pattern`, `startTime`, and `endTime`.
    return new PipeHeartbeatEvent(
        pipeName, creationTime, pipeTaskMeta, dataRegionId, timePublished, shouldPrintMessage);
  }

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

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

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

  /////////////////////////////// Whether to print ///////////////////////////////

  public boolean isShouldPrintMessage() {
    return shouldPrintMessage;
  }

  /////////////////////////////// Delay Reporting ///////////////////////////////

  public void onPublished() {
    if (shouldPrintMessage) {
      timePublished = System.currentTimeMillis();
    }
  }

  public void onAssigned() {
    if (shouldPrintMessage) {
      timeAssigned = System.currentTimeMillis();
      if (timePublished != 0) {
        PipeHeartbeatEventMetrics.getInstance()
            .recordPublishedToAssignedTime(timeAssigned - timePublished);
      }
    }
  }

  public void onProcessed() {
    if (shouldPrintMessage) {
      timeProcessed = System.currentTimeMillis();
      if (timeAssigned != 0) {
        PipeHeartbeatEventMetrics.getInstance()
            .recordAssignedToProcessedTime(timeProcessed - timeAssigned);
      }
    }
  }

  public void onTransferred() {
    if (shouldPrintMessage) {
      timeTransferred = System.currentTimeMillis();
      if (timeProcessed != 0) {
        PipeHeartbeatEventMetrics.getInstance()
            .recordProcessedToTransferredTime(timeTransferred - timeProcessed);
      }
    }
  }

  /////////////////////////////// Queue size Reporting ///////////////////////////////

  public void recordDisruptorSize(final RingBuffer ringBuffer) {
    if (shouldPrintMessage) {
      disruptorSize = ringBuffer.getBufferSize() - (int) ringBuffer.remainingCapacity();
    }
  }

  public void recordExtractorQueueSize(final UnboundedBlockingPendingQueue<Event> pendingQueue) {
    if (shouldPrintMessage) {
      extractorQueueTabletSize = pendingQueue.getTabletInsertionEventCount();
      extractorQueueTsFileSize = pendingQueue.getTsFileInsertionEventCount();
      extractorQueueSize = pendingQueue.size();
    }
  }

  public void recordConnectorQueueSize(final UnboundedBlockingPendingQueue<Event> pendingQueue) {
    if (shouldPrintMessage) {
      connectorQueueTabletSize = pendingQueue.getTabletInsertionEventCount();
      connectorQueueTsFileSize = pendingQueue.getTsFileInsertionEventCount();
      connectorQueueSize = pendingQueue.size();
    }
  }

  /////////////////////////////// For Commit Ordering ///////////////////////////////

  /** {@link PipeHeartbeatEvent}s do not need to be committed in order. */
  @Override
  public boolean needToCommit() {
    return false;
  }

  /////////////////////////////// Object ///////////////////////////////

  @Override
  public String toString() {
    final String unknownMessage = "Unknown";

    final String startTimeMessage =
        (timePublished != 0)
            ? DateTimeUtils.convertLongToDate(timePublished, "ms")
            : unknownMessage;
    final String publishedToAssignedMessage =
        (timeAssigned != 0 && timePublished != 0)
            ? (timeAssigned - timePublished) + "ms"
            : unknownMessage;
    final String assignedToProcessedMessage =
        (timeProcessed != 0 && timeAssigned != 0)
            ? (timeProcessed - timeAssigned) + "ms"
            : unknownMessage;
    final String processedToTransferredMessage =
        (timeTransferred != 0 && timeProcessed != 0)
            ? (timeTransferred - timeProcessed) + "ms"
            : unknownMessage;
    final String totalTimeMessage =
        (timeTransferred != 0 && timePublished != 0)
            ? (timeTransferred - timePublished) + "ms"
            : unknownMessage;

    final String disruptorSizeMessage = Integer.toString(disruptorSize);

    final String extractorQueueTabletSizeMessage =
        timeAssigned != 0 ? Integer.toString(extractorQueueTabletSize) : unknownMessage;
    final String extractorQueueTsFileSizeMessage =
        timeAssigned != 0 ? Integer.toString(extractorQueueTsFileSize) : unknownMessage;
    final String extractorQueueSizeMessage =
        timeAssigned != 0 ? Integer.toString(extractorQueueSize) : unknownMessage;

    final String connectorQueueTabletSizeMessage =
        timeProcessed != 0 ? Integer.toString(connectorQueueTabletSize) : unknownMessage;
    final String connectorQueueTsFileSizeMessage =
        timeProcessed != 0 ? Integer.toString(connectorQueueTsFileSize) : unknownMessage;
    final String connectorQueueSizeMessage =
        timeProcessed != 0 ? Integer.toString(connectorQueueSize) : unknownMessage;

    return "PipeHeartbeatEvent{"
        + "pipeName='"
        + pipeName
        + "', dataRegionId="
        + dataRegionId
        + ", startTime="
        + startTimeMessage
        + ", publishedToAssigned="
        + publishedToAssignedMessage
        + ", assignedToProcessed="
        + assignedToProcessedMessage
        + ", processedToTransferred="
        + processedToTransferredMessage
        + ", totalTimeCost="
        + totalTimeMessage
        + ", disruptorSize="
        + disruptorSizeMessage
        + ", extractorQueueTabletSize="
        + extractorQueueTabletSizeMessage
        + ", extractorQueueTsFileSize="
        + extractorQueueTsFileSizeMessage
        + ", extractorQueueSize="
        + extractorQueueSizeMessage
        + ", connectorQueueTabletSize="
        + connectorQueueTabletSizeMessage
        + ", connectorQueueTsFileSize="
        + connectorQueueTsFileSizeMessage
        + ", connectorQueueSize="
        + connectorQueueSizeMessage
        + "}";
  }
}
