import type {VpaidCreativeAdUnit} from '../../../types'

export const waitFor = (
  creativeAd: VpaidCreativeAdUnit,
  event: string,
  timeout?: number
): Promise<void> =>
  new Promise<void>((resolve, reject) => {
    let timeoutId: number
    const handler = (): void => {
      if (typeof timeout === 'number') {
        window.clearTimeout(timeoutId)
      }

      creativeAd.unsubscribe(handler, event)
      resolve()
    }

    if (typeof timeout === 'number') {
      timeoutId = window.setTimeout(() => {
        creativeAd.unsubscribe(handler, event)
        reject(new Error(`Timeout waiting for event '${event}'`))
      }, timeout)
    }

    creativeAd.subscribe(handler, event)
  })