batchCooking/apps/api/src/modules/reference/reference.service.ts

import type {
  AllergyView,
  DietView,
  IngredientView,
  TechStepView,
  UnitView,
} from "@batch-cooking/shared";
import { prisma } from "../../db/prisma.js";

/**
 * All reference dietary regimes, ordered by `key` — small, static list (see
 * prisma/seed.ts). `key` is a stable slug, not the display label (see
 * {@link DietView}), so this is an alphabetical-by-slug order rather than a
 * true French alphabetical one — close enough for a 5-item list, and the
 * server has no other order to offer now that the label itself only exists
 * client-side (`apps/web`'s `locales/fr/translation.json`).
 */
export async function getDiets(): Promise<DietView[]> {
  return prisma.diet.findMany({ orderBy: { key: "asc" } });
}

/**
 * All reference allergens, ordered by key (see {@link getDiets} for why key,
 * not label). `Allergy` carries no `key` of its own — it's the selectable
 * instance of a keyed `Category` (see schema.prisma) — so this resolves
 * each allergen's key from its category and flattens the split away for
 * callers.
 */
export async function getAllergies(): Promise<AllergyView[]> {
  const allergies = await prisma.allergy.findMany({
    include: { category: { select: { key: true, kind: true } } },
    orderBy: { category: { key: "asc" } },
  });
  return allergies.map((allergy) => ({
    id: allergy.id,
    key: allergy.category.key,
    kind: allergy.category.kind,
  }));
}

/**
 * All reference recipe-ingredient units, ordered by key (see {@link getDiets}
 * for why) — small, static list (see `reference-seed-data.ts`'s `UNITS`).
 * `toBaseFactor` comes back as a Prisma `Decimal`, converted to a plain
 * `number` here the same way `recipe.service.ts` does for
 * `RecipeIngredient.quantity`.
 */
export async function getUnits(): Promise<UnitView[]> {
  const units = await prisma.unit.findMany({ orderBy: { key: "asc" } });
  return units.map((unit) => ({
    id: unit.id,
    key: unit.key,
    type: unit.type,
    toBaseFactor: Number(unit.toBaseFactor),
  }));
}

/**
 * All reference cooking techniques, ordered by key (see {@link getDiets}
 * for why) — small, static list (see `reference-seed-data.ts`'s
 * `TECH_STEPS`). Not consumed by the recipe UI yet — see {@link TechStepView}.
 */
export async function getTechSteps(): Promise<TechStepView[]> {
  return prisma.techStep.findMany({ orderBy: { key: "asc" } });
}

/**
 * All reference ingredients, ordered by key (see {@link getDiets} for why),
 * each resolved to its allergens (see `IngredientAllergy` in schema.prisma)
 * and compatible diet regimes (see `IngredientDiet`) — same flattening
 * approach as {@link getAllergies}. Ingredients with no linked
 * allergen/diet come back with `allergens: []`/`diets: []`.
 */
export async function getIngredients(): Promise<IngredientView[]> {
  const ingredients = await prisma.ingredient.findMany({
    include: {
      allergies: { include: { allergy: { include: { category: true } } } },
      diets: { include: { diet: true } },
    },
    orderBy: { key: "asc" },
  });
  return ingredients.map((ingredient) => ({
    id: ingredient.id,
    key: ingredient.key,
    icon: ingredient.icon,
    category: ingredient.category,
    subcategory: ingredient.subcategory,
    reproducible: ingredient.reproducible,
    allergens: ingredient.allergies.map(({ allergy }) => ({
      id: allergy.id,
      key: allergy.category.key,
      kind: allergy.category.kind,
    })),
    diets: ingredient.diets.map(({ diet }) => ({ id: diet.id, key: diet.key })),
  }));
}