import type { Appliance, CookingStyle, Cuisine, MealKind, RecipeData, RecipeIngredient, RecipeUnit } from "@/app/types";

// ---------------------------------------------------------------------------
// Compact recipe format, used for the big recipe library in ./extra/.
//
// Instead of a 12-line object per recipe, each dish is one entry with its
// ingredients written like a shopping list:
//
//   { title: "Beef Stroganoff", mins: 30, tools: ["stovetop"], styles: ["comfort"],
//     about: "Creamy mushroom sauce over egg noodles.",
//     items: "ground_beef 1 lb; egg_noodles 12 oz; mushrooms 8 oz; sour_cream 0.5 cup" }
//
// Each ingredient is "<catalog item id> <amount> <unit>". Bad units throw at
// module load, so typos fail loudly in dev instead of producing $0 groceries.
// ---------------------------------------------------------------------------

interface DishInput {
  title: string;
  /** Defaults to a slug of the title. Set it explicitly to keep saved plans stable if you rename. */
  id?: string;
  about: string;
  mins: number;
  tools: Appliance[];
  styles?: CookingStyle[];
  /** Defaults to the file's cuisine/kind (see `dishes`). */
  cuisine?: Cuisine;
  kind?: MealKind;
  /** People one batch feeds. Default 4. */
  serves?: number;
  /** "item_id amount unit; item_id amount unit; …" */
  items: string;
  /** Optional cook's tip shown under the steps. */
  tip?: string;
}

const UNITS = new Set<RecipeUnit>(["g", "oz", "lb", "ml", "tsp", "tbsp", "cup", "each"]);

const slugify = (text: string) =>
  text
    .normalize("NFD") // "Étouffée" → "Etouffee" + combining accents…
    .replace(/[\u0300-\u036f]/g, "") // …which this strips
    .replace(/ı/g, "i") // Turkish dotless i (doesn't decompose)
    .toLowerCase()
    .replace(/['’]/g, "") // "Shepherd's" → "shepherds", not "shepherd-s"
    .replace(/&/g, "and")
    .replace(/[^a-z0-9]+/g, "-")
    .replace(/^-|-$/g, "");

function parseItems(items: string, title: string): RecipeIngredient[] {
  return items
    .split(";")
    .map((part) => part.trim())
    .filter(Boolean)
    .map((part) => {
      const [itemId, amountText, unit] = part.split(/\s+/);
      const amount = Number(amountText);
      if (!itemId || !Number.isFinite(amount) || amount <= 0 || !UNITS.has(unit as RecipeUnit)) {
        throw new Error(`Recipe "${title}": can't parse ingredient "${part}" (expected "item_id amount unit")`);
      }
      return { itemId, amount, unit: unit as RecipeUnit };
    });
}

/** Build a list of recipes that share a default cuisine and meal kind. */
export function dishes(defaults: { cuisine: Cuisine; kind?: MealKind }, list: DishInput[]): RecipeData[] {
  return list.map((d) => ({
    id: d.id ?? slugify(d.title),
    title: d.title,
    description: d.about,
    cuisine: d.cuisine ?? defaults.cuisine,
    styles: d.styles ?? [],
    kind: d.kind ?? defaults.kind ?? "main",
    prepTime: d.mins,
    requiredAppliances: d.tools,
    servings: d.serves ?? 4,
    ingredients: parseItems(d.items, d.title),
    ...(d.tip ? { tip: d.tip } : {}),
  }));
}