/*
 * Copyright 2018 the original author or authors.
 *
 * 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 dev.failsafe.internal.util;

/**
 * Utilities for computing random delays.
 *
 * @author Jonathan Halterman
 */
public final class RandomDelay {
  private RandomDelay() {
  }

  public static long randomDelayInRange(long delayMin, long delayMax, double random) {
    return (long) (random * (delayMax - delayMin)) + delayMin;
  }

  public static long randomDelay(long delay, long jitter, double random) {
    double randomAddend = (1 - random * 2) * jitter;
    return (long) (delay + randomAddend);
  }

  public static long randomDelay(long delay, double jitterFactor, double random) {
    double randomFactor = 1 + (1 - random * 2) * jitterFactor;
    return (long) (delay * randomFactor);
  }
}
