matter-operation.ts

export function deQueueWaitingMatters(
  matterQueue: IWaitAnimatingMatter[],
  now = new Date()
): IDeQueueWaitingMattersResult {
  if (!isNeedAnimated(matterQueue, now)) {
    return { newQueue: matterQueue }
  }
  const nextAnimationTime = moment(now)
    .add(300, 'milliseconds')
    .toDate()
  const newQueue: IWaitAnimatingMatter[] = matterQueue
    .slice(1)
    .map<IWaitAnimatingMatter>(e => ({
      expected_animated_time: nextAnimationTime,
      matter: e.matter
    }))
  return {
    newQueue,
    matterToAnimated: matterQueue[0].matter
  }
}

export function isNeedAnimated(
  matterQueue: IWaitAnimatingMatter[],
  now: Date = new Date()
) {
  const animatingMatter = matterQueue[0]
  if (!animatingMatter) {
    return false
  }
  if (animatingMatter.expected_animated_time === null) {
    return true
  }
  if (moment(now).isBefore(moment(animatingMatter.expected_animated_time))) {
    return false
  }
  return true
}