Sven (AAMOS AI)
41 lines
1.3 KiB
TypeScript
41 lines
1.3 KiB
TypeScript
import { UNIT_INFO, type Unit } from "@app/shared-types";
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export interface ScalableIngredient {
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canonicalIngredientId: string;
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displayNameSv: string;
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quantity: number;
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unit: Unit;
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optional: boolean;
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}
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/** Enheter som avrundas till "köksvänliga" mängder vid skalning. */
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const SPOON_UNITS: ReadonlySet<Unit> = new Set(["TABLESPOON", "TEASPOON", "PINCH"]);
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/**
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* Skala recept till annat antal portioner (Cooking Mode: "skala till sex personer").
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* Kryddmått avrundas till halva mått; styck till kvartar.
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*/
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export function scaleIngredients(
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ingredients: ScalableIngredient[],
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fromPortions: number,
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toPortions: number,
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): ScalableIngredient[] {
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if (fromPortions <= 0 || toPortions <= 0) {
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throw new Error("Portioner måste vara > 0");
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}
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const factor = toPortions / fromPortions;
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return ingredients.map((ing) => ({
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...ing,
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quantity: roundForUnit(ing.quantity * factor, ing.unit),
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}));
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}
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function roundForUnit(value: number, unit: Unit): number {
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if (SPOON_UNITS.has(unit)) return Math.round(value * 2) / 2;
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if (UNIT_INFO[unit].kind === "count") return Math.round(value * 4) / 4;
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if (unit === "KILOGRAM" || unit === "LITER" || unit === "POUND")
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return Math.round(value * 100) / 100;
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if (unit === "CUP_US") return Math.round(value * 4) / 4;
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return Math.round(value * 10) / 10;
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}
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