import { ISettings } from '../types';

export type CarouselType = 'uniform' | 'spotlight' | 'buy_box';

export const DEFAULT_CAROUSEL_TYPE: CarouselType = 'uniform';

/**
 * Resolve the effective carousel type using backwards-compatible defaults.
 * Legacy behaviour keeps the centered grow variant when the shop this look
 * display is set to product_list unless the new setting is explicitly provided.
 */
export const resolveCarouselType = (settings?: ISettings): CarouselType => {
  if (!settings) {
    return DEFAULT_CAROUSEL_TYPE;
  }

  if (settings.carousel_type) {
    return settings.carousel_type;
  }

  return settings.shop_this_look_display === 'product_list'
    ? 'spotlight'
    : DEFAULT_CAROUSEL_TYPE;
};

export const isSpotlightCarousel = (settings?: ISettings): boolean =>
  resolveCarouselType(settings) === 'spotlight';