/*
 * 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.confignode.manager.load.cache.node;

import org.apache.iotdb.commons.cluster.NodeStatus;
import org.apache.iotdb.commons.utils.TestOnly;
import org.apache.iotdb.confignode.rpc.thrift.TConfigNodeHeartbeatResp;
import org.apache.iotdb.mpp.rpc.thrift.TDataNodeHeartbeatResp;
import org.apache.iotdb.mpp.rpc.thrift.TLoadSample;

public class NodeHeartbeatSample {

  // Unit: ms
  private final long sendTimestamp;
  private final long receiveTimestamp;

  private final NodeStatus status;
  private final String statusReason;

  private TLoadSample loadSample = null;

  @TestOnly
  public NodeHeartbeatSample(long sendTimestamp, long receiveTimestamp) {
    this.sendTimestamp = sendTimestamp;
    this.receiveTimestamp = receiveTimestamp;
    this.status = NodeStatus.Running;
    this.statusReason = null;
  }

  /** Constructor for DataNode sample. */
  public NodeHeartbeatSample(TDataNodeHeartbeatResp heartbeatResp, long receiveTimestamp) {
    this.sendTimestamp = heartbeatResp.getHeartbeatTimestamp();
    this.receiveTimestamp = receiveTimestamp;

    this.status = NodeStatus.parse(heartbeatResp.getStatus());
    this.statusReason = heartbeatResp.isSetStatusReason() ? heartbeatResp.getStatusReason() : null;

    if (heartbeatResp.isSetLoadSample()) {
      this.loadSample = heartbeatResp.getLoadSample();
    }
  }

  /** Constructor for ConfigNode sample. */
  public NodeHeartbeatSample(TConfigNodeHeartbeatResp heartbeatResp, long receiveTimestamp) {
    this.sendTimestamp = heartbeatResp.getTimestamp();
    this.receiveTimestamp = receiveTimestamp;
    this.status = NodeStatus.Running;
    this.statusReason = null;
  }

  public long getSendTimestamp() {
    return sendTimestamp;
  }

  public long getReceiveTimestamp() {
    return receiveTimestamp;
  }

  public NodeStatus getStatus() {
    return status;
  }

  public String getStatusReason() {
    return statusReason;
  }

  public boolean isSetLoadSample() {
    return loadSample != null;
  }

  public TLoadSample getLoadSample() {
    return loadSample;
  }

  /**
   * Generate a default NodeHeartbeatSample.
   *
   * <p>i.e. Only contain timestamp and NodeStatus
   *
   * @param status The NodeStatus in default NodeSample
   * @return A NodeHeartbeatSample that only contain timestamp and NodeStatus
   */
  public static NodeHeartbeatSample generateDefaultSample(NodeStatus status) {
    long currentTime = System.nanoTime();
    return new NodeHeartbeatSample(
        new TDataNodeHeartbeatResp(currentTime, status.getStatus()).setStatusReason(null),
        currentTime);
  }
}
