shahikitchen-prod/application/menu/filter-menu.ts

import type { MenuCategory, MenuFilter, MenuItem } from '@/domain/menu/entities';

export function filterMenuCategories(
  categories: MenuCategory[],
  filter: MenuFilter
): MenuCategory[] {
  const query = filter.searchQuery?.toLowerCase().trim() ?? '';

  return categories
    .map((category) => {
      if (filter.categoryId && filter.categoryId !== 'All' && category.id !== filter.categoryId) {
        return { ...category, items: [] };
      }

      let items = category.items;

      if (query) {
        items = items.filter(
          (item) =>
            item.name.toLowerCase().includes(query) ||
            (item.description?.toLowerCase().includes(query) ?? false)
        );
      }

      if (filter.vegetarianOnly) {
        items = items.filter((item) => item.isVegetarian);
      }

      return { ...category, items };
    })
    .filter((category) => category.items.length > 0);
}

export function filterMenuItems(items: MenuItem[], filter: MenuFilter): MenuItem[] {
  const query = filter.searchQuery?.toLowerCase().trim() ?? '';

  return items.filter((item) => {
    if (filter.vegetarianOnly && !item.isVegetarian) return false;
    if (!query) return true;
    return (
      item.name.toLowerCase().includes(query) ||
      (item.description?.toLowerCase().includes(query) ?? false)
    );
  });
}