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/*
 * Copyright © 2017 camunda services GmbH ([email protected])
 *
 * Licensed 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 io.zeebe.gossip.membership;

public class GossipTerm {
  private long epoch;
  private long heartbeat;

  public GossipTerm() {
    epoch = 0;
    heartbeat = 0;
  }

  public long getEpoch() {
    return epoch;
  }

  public GossipTerm epoch(long epoch) {
    this.epoch = epoch;
    return this;
  }

  public long getHeartbeat() {
    return heartbeat;
  }

  public GossipTerm heartbeat(long heartBeat) {
    this.heartbeat = heartBeat;
    return this;
  }

  public void increment() {
    heartbeat += 1;
  }

  public GossipTerm wrap(GossipTerm otherTerm) {
    return epoch(otherTerm.getEpoch()).heartbeat(otherTerm.getHeartbeat());
  }

  public boolean isGreaterThan(GossipTerm otherTerm) {
    return epoch > otherTerm.epoch || (epoch == otherTerm.epoch && heartbeat > otherTerm.heartbeat);
  }

  public boolean isEqual(GossipTerm otherTerm) {
    return epoch == otherTerm.epoch && heartbeat == otherTerm.heartbeat;
  }

  @Override
  public String toString() {
    final StringBuilder builder = new StringBuilder();
    builder.append("[epoch=");
    builder.append(epoch);
    builder.append(", heartBeat=");
    builder.append(heartbeat);
    builder.append("]");
    return builder.toString();
  }

  @Override
  public int hashCode() {
    final int prime = 31;
    int result = 1;
    result = prime * result + (int) (epoch ^ (epoch >>> 32));
    result = prime * result + (int) (heartbeat ^ (heartbeat >>> 32));
    return result;
  }

  @Override
  public boolean equals(Object obj) {
    if (this == obj) {
      return true;
    }
    if (obj == null) {
      return false;
    }
    if (getClass() != obj.getClass()) {
      return false;
    }
    final GossipTerm other = (GossipTerm) obj;
    if (epoch != other.epoch) {
      return false;
    }
    if (heartbeat != other.heartbeat) {
      return false;
    }
    return true;
  }
}