/**
 * 将 Directus 返回的 Homepage 数据转换为 HomepageView 视图模型
 *
 * @param raw: 原始的 Homepage 数据
 * @returns 转换后的 HomepageView 对象
 *
 * @example
 * const view = toHomepageView(rawHomepage);
 */
export function toHomepageView(raw: Homepage): HomepageView {
  const carousel = (raw.carousel ?? [])
    .filter(isObject<HomepageFile>)
    .map((item) => item.directus_files_id)
    .filter((item) => typeof item === 'string');

  const products = (raw.recommend_products ?? [])
    .filter(isObject<Product>)
    .map((item) => {
      const cover = isObject<DirectusFile>(item.cover)
        ? item.cover.id
        : item.cover;
      return {
        id: item.id,
        name: item.translations?.[0].name,
        summary: item.translations?.[0].summary,
        cover: cover,
      } satisfies HomepageProductView;
    });

  const solutions = (raw.recommend_solutions ?? [])
    .filter(isObject<Solution>)
    .map((item) => {
      const cover = isObject<DirectusFile>(item.cover)
        ? item.cover.id
        : item.cover;

      return {
        id: item.id,
        title: item.translations?.[0].title,
        summary: item.translations?.[0].summary,
        cover: cover,
      } satisfies HomepageSolutionView;
    });

  return {
    id: raw.id,
    carousel: carousel ?? [],
    recommendProducts: products ?? [],
    recommendSolutions: solutions ?? [],
  };
}