/**
 * Copyright 2023 Gravitational, Inc
 *
 * 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.
 */

import { useEffect, useRef } from 'react';

export function useInterval(callback: () => void, delay: number | null): void {
  const savedCallback = useRef<() => void>();

  // Remember the latest callback
  useEffect(() => {
    savedCallback.current = callback;
  }, [callback]);

  // Set up the interval
  useEffect(() => {
    function tick() {
      savedCallback.current();
    }

    if (delay !== null) {
      const id = setInterval(tick, delay);
      return () => clearInterval(id);
    }
  }, [delay]);
}