export type VariantPlanItem = {
  kind: "thumb" | "poster";
  size: number;
};

export function pickSmallestVariantSize(plan: VariantPlanItem[]): number | null {
  if (plan.length === 0) return null;
  return plan.reduce((min, item) => (item.size < min ? item.size : min), plan[0].size);
}

export function computeImageVariantPlan(): VariantPlanItem[] {
  return [
    { kind: "thumb", size: 256 },
    { kind: "thumb", size: 768 },
  ];
}

export function computeVideoPosterPlan(): VariantPlanItem[] {
  return [
    { kind: "poster", size: 256 },
    { kind: "poster", size: 768 },
  ];
}