fix:manage edit for extra bezoekers payments

packages/api/src/routers/index.ts

@@ -172,11 +172,28 @@ export const appRouter = {
 		.handler(async ({ input }) => {
 			const row = await getActiveRegistration(input.token);
 
-			// If already paid and switching to a watcher with fewer guests, we
-			// still allow the update — payment adjustments are handled manually.
 			const isPerformer = input.registrationType === "performer";
 			const guests = isPerformer ? [] : (input.guests ?? []);
 
+			// Detect whether an already-paid watcher is adding extra guests so we
+			// can charge them the delta instead of the full amount.
+			const isPaid = row.paymentStatus === "paid";
+			const oldGuestCount = isPerformer
+				? 0
+				: parseGuestsJson(row.guests).length;
+			const newGuestCount = guests.length;
+			const extraGuests =
+				!isPerformer && isPaid ? newGuestCount - oldGuestCount : 0;
+
+			// Determine the new paymentStatus and paymentAmount (delta in cents).
+			// Only flag extra_payment_pending when the watcher genuinely owes more.
+			const newPaymentStatus =
+				isPaid && extraGuests > 0 ? "extra_payment_pending" : row.paymentStatus;
+			const newPaymentAmount =
+				newPaymentStatus === "extra_payment_pending"
+					? extraGuests * 2 * 100 // €2 per extra guest, in cents
+					: row.paymentAmount;
+
 			await db
 				.update(registration)
 				.set({
@@ -191,6 +208,8 @@ export const appRouter = {
 					drinkCardValue: isPerformer ? 0 : drinkCardEuros(guests.length),
 					guests: guests.length > 0 ? JSON.stringify(guests) : null,
 					extraQuestions: input.extraQuestions || null,
+					paymentStatus: newPaymentStatus,
+					paymentAmount: newPaymentAmount,
 				})
 				.where(eq(registration.managementToken, input.token));
 
@@ -202,9 +221,6 @@ export const appRouter = {
 				artForm: input.artForm,
 			}).catch((err) => console.error("Failed to send update email:", err));
 
-			// Satisfy the linter — row is used to confirm the record existed.
-			void row;
-
 			return { success: true };
 		}),
 
@@ -540,11 +556,27 @@ export const appRouter = {
 			if (!row) throw new Error("Inschrijving niet gevonden");
 			if (row.paymentStatus === "paid")
 				throw new Error("Betaling is al voltooid");
+			if (
+				row.paymentStatus !== "pending" &&
+				row.paymentStatus !== "extra_payment_pending"
+			)
+				throw new Error("Onverwachte betalingsstatus");
 			if (row.registrationType === "performer")
 				throw new Error("Artiesten hoeven niet te betalen");
 
 			const guests = parseGuestsJson(row.guests);
-			const amountInCents = drinkCardCents(guests.length);
+
+			// For an extra_payment_pending registration, charge only the delta
+			// (stored in paymentAmount in cents). For a fresh pending registration
+			// charge the full drink card price.
+			const isExtraPayment = row.paymentStatus === "extra_payment_pending";
+			const amountInCents = isExtraPayment
+				? (row.paymentAmount ?? 0)
+				: drinkCardCents(guests.length);
+
+			const productDescription = isExtraPayment
+				? `Extra bijdrage voor ${row.paymentAmount != null ? row.paymentAmount / 200 : 0} extra gast(en)`
+				: `Toegangskaart voor ${1 + guests.length} perso(o)n(en)`;
 
 			const response = await fetch(
 				"https://api.lemonsqueezy.com/v1/checkouts",
@@ -562,7 +594,7 @@ export const appRouter = {
 								custom_price: amountInCents,
 								product_options: {
 									name: "Kunstenkamp Evenement",
-									description: `Toegangskaart voor ${1 + guests.length} perso(o)n(en)`,
+									description: productDescription,
 									redirect_url: `${env.CORS_ORIGIN}/manage/${input.token}`,
 								},
 								checkout_data: {