ruvector/studio/hooks/misc/useSynchronizedAnimation.ts

import { useIsomorphicLayoutEffect } from 'common'
import { useRef } from 'react'

// Source: https://youtu.be/3kDVachh-BM

let stashedTime: number | null = null

export function useSynchronizedAnimation<T>(name: string) {
  const ref = useRef<T>(null)

  useIsomorphicLayoutEffect(() => {
    const animations = document
      .getAnimations()
      .filter(
        (animation) => animation instanceof CSSAnimation && animation.animationName === 'shimmer'
      )

    const myAnimation = animations.find(
      (animation) =>
        animation.effect instanceof KeyframeEffect && animation.effect.target === ref.current
    )

    if (myAnimation === undefined) {
      return
    }

    const leadAnimation = animations[0]

    if (myAnimation === leadAnimation && stashedTime) {
      myAnimation.currentTime = stashedTime
    }

    if (myAnimation !== leadAnimation) {
      myAnimation.currentTime = leadAnimation.currentTime
    }

    return () => {
      if (myAnimation === leadAnimation && myAnimation.currentTime) {
        stashedTime = Number(myAnimation.currentTime)
      }
    }
  }, [])

  return ref
}