58 lines
2.2 KiB
TypeScript
58 lines
2.2 KiB
TypeScript
import type { Recipe, RecipeIngredient } from "@/app/types";
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import { CATALOG_BY_ID } from "./catalog";
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// ---------------------------------------------------------------------------
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// Human-friendly ingredient lines, scaled to a serving count.
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//
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// ing("white_rice", 1.5, "cup") for 4 → shown for 2 as "¾ cup Long Grain White Rice"
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// ing("black_beans", 1, "each") → "1 × Black Beans, canned (15 oz can)"
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// ---------------------------------------------------------------------------
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const FRACTIONS: [number, string][] = [
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[0, ""],
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[1 / 8, "⅛"],
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[1 / 4, "¼"],
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[1 / 3, "⅓"],
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[1 / 2, "½"],
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[2 / 3, "⅔"],
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[3 / 4, "¾"],
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[1, ""],
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];
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/** 0.75 → "¾", 1.5 → "1½", 2.33 → "2⅓", 13.2 → "13". */
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export function formatQuantity(value: number): string {
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if (value >= 10) return String(Math.round(value));
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const whole = Math.floor(value);
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const fraction = value - whole;
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const [nearest, glyph] = FRACTIONS.reduce((best, f) => (Math.abs(f[0] - fraction) < Math.abs(best[0] - fraction) ? f : best));
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const total = whole + (nearest === 1 ? 1 : 0);
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if (total === 0 && glyph === "") return "⅛"; // never show "0" for a real ingredient
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return `${total > 0 ? total : ""}${glyph}` || "0";
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}
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export interface IngredientLine {
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quantity: string;
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/** e.g. "cup", "lb", or "×" for counted items. */
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unit: string;
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name: string;
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/** Package hint for counted items, e.g. "15 oz can". */
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detail?: string;
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}
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export function ingredientLine(ingredient: RecipeIngredient, scale: number): IngredientLine {
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const item = CATALOG_BY_ID.get(ingredient.itemId);
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const name = item?.name ?? ingredient.itemId;
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const quantity = formatQuantity(ingredient.amount * scale);
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if (ingredient.unit === "each") {
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// Single-unit packages (a can, a jar) read better with the package size.
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const detail = item && item.packageSize === 1 && item.packageLabel !== "each" ? item.packageLabel : undefined;
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return { quantity, unit: "×", name, detail };
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}
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return { quantity, unit: ingredient.unit, name };
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}
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export function ingredientLines(recipe: Recipe, servings: number): IngredientLine[] {
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const scale = servings / recipe.servings;
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return recipe.ingredients.map((i) => ingredientLine(i, scale));
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}
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