Sven (AAMOS AI)
70 lines
2.0 KiB
TypeScript
70 lines
2.0 KiB
TypeScript
import type { Substitution, Unit } from "@app/shared-types";
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export interface SubstitutableIngredient {
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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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export interface SubstitutionResult {
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ingredients: SubstitutableIngredient[];
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applied: {
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fromId: string;
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toId: string;
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ratio: number;
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instructionsSv?: string | undefined;
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warningSv?: string | undefined;
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};
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}
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/**
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* Substitutionsmotor (spec §20): byt ingrediens med mängdfaktor och
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* instruktionspåverkan. Näringen räknas ALLTID om av nutrition-engine efteråt –
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* denna modul ändrar bara ingredienslistan.
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*/
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export function applySubstitution(
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ingredients: SubstitutableIngredient[],
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substitution: Pick<
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Substitution,
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"fromIngredientId" | "toIngredientId" | "ratio" | "instructionsSv" | "notRecommendedFor"
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>,
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toDisplayNameSv: string,
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context?: string,
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): SubstitutionResult {
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const target = ingredients.find((i) => i.canonicalIngredientId === substitution.fromIngredientId);
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if (!target) {
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throw new Error(
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`Ingrediensen ${substitution.fromIngredientId} finns inte i receptet och kan inte bytas.`,
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);
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}
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let warningSv: string | undefined;
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if (context && substitution.notRecommendedFor.includes(context)) {
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warningSv = `Observera: detta byte rekommenderas inte för ${context}.`;
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}
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const next = ingredients.map((ing) =>
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ing.canonicalIngredientId === substitution.fromIngredientId
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? {
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...ing,
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canonicalIngredientId: substitution.toIngredientId,
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displayNameSv: toDisplayNameSv,
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quantity: Math.round(ing.quantity * substitution.ratio * 100) / 100,
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}
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: ing,
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);
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return {
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ingredients: next,
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applied: {
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fromId: substitution.fromIngredientId,
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toId: substitution.toIngredientId,
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ratio: substitution.ratio,
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instructionsSv: substitution.instructionsSv ?? undefined,
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warningSv,
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},
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};
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}
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