export const normalizeScale = (value: number | null | undefined) => {
  return Number.isFinite(value) && Number(value) > 0 ? Number(value) : 1
}

export const getDisplayedImageScale = ({
  rasterScale,
  viewScale,
}: {
  rasterScale?: number | null
  viewScale?: number | null
}) => {
  return normalizeScale(rasterScale) * normalizeScale(viewScale)
}

export const getViewScaleFromDisplayedScale = ({
  displayedScale,
  rasterScale,
}: {
  displayedScale?: number | null
  rasterScale?: number | null
}) => {
  return normalizeScale(displayedScale) / normalizeScale(rasterScale)
}