import type { IngredientView } from "@batch-cooking/shared";

/**
 * The display name for an ingredient line.
 *
 * A real catalog ingredient has no name in the database — its French label
 * lives in i18n under `catalog.ingredients.<key>` — so it's resolved
 * through `t`. A **placeholder** (`IngredientView.isPlaceholder`, the
 * free text a user typed when the catalog fell short — see
 * `Ingredient.isPlaceholder` in schema.prisma) has its name stored on the
 * row as `displayName` and no i18n key at all, so it's shown verbatim.
 *
 * Every place that used to inline `t(\`catalog.ingredients.${ingredient.key}\`)`
 * goes through this instead, so a placeholder never renders as the raw,
 * missing translation key `catalog.ingredients.placeholder:<uuid>`.
 *
 * `t` is passed in (rather than calling `useTranslation` here) so this
 * stays a plain function usable from non-component code and unit-testable
 * without mounting i18next — same split as `shopping-list.ts`.
 */
export function ingredientLabel(
  ingredient: Pick<IngredientView, "key" | "displayName">,
  t: (key: string) => string,
): string {
  return ingredient.displayName ?? t(`catalog.ingredients.${ingredient.key}`);
}