feat:drinkkaart

apps/web/src/lib/drinkkaart.ts

@@ -0,0 +1,18 @@
+// Frontend constants and utilities for the Drinkkaart feature.
+
+export const TOPUP_PRESETS_CENTS = [500, 1000, 2000, 5000] as const;
+// = €5, €10, €20, €50
+
+export const DEDUCTION_PRESETS_CENTS = [150, 200, 300, 500] as const;
+// = €1,50 / €2,00 / €3,00 / €5,00 — typical drink prices
+
+export const TOPUP_MIN_CENTS = 100; // €1
+export const TOPUP_MAX_CENTS = 50000; // €500
+
+/** Format a cents integer as a Belgian euro string, e.g. 1250 → "€ 12,50". */
+export function formatCents(cents: number): string {
+	return new Intl.NumberFormat("nl-BE", {
+		style: "currency",
+		currency: "EUR",
+	}).format(cents / 100);
+}