move CRUD operations to helpers

helpers/bill.ts

@@ -1,11 +1,18 @@
 import { MILAGE_TARIFS } from '../db/enums'
-import { AdditionalCost } from '../db/bill'
+import { AdditionalCost, Bill } from '../db/bill'
+import fetch from './fetch'
 
 function roundToCent(amount: number): number {
   return Math.round(amount * 100) / 100
 }
 
-export function getMilageCosts({ tarif, km }: { tarif: MILAGE_TARIFS; km: number }): number {
+export function getMilageCosts({
+  tarif,
+  km,
+}: {
+  tarif: MILAGE_TARIFS
+  km: number
+}): number {
   if (tarif === MILAGE_TARIFS.NOCHARGE) {
     return 0
   }
@@ -63,3 +70,23 @@ export function getBillTotal({
 
   return roundToCent(milageCosts + additionalCostsSum)
 }
+
+export async function createBill(
+  bookingUuid: string,
+  bill: Bill
+): Promise<Bill> {
+  return fetch(`/api/admin/booking/${bookingUuid}/bill`, {
+    method: 'POST',
+    body: bill,
+  })
+}
+
+export async function patchBill(
+  bookingUuid: string,
+  bill: Bill
+): Promise<Bill> {
+  return fetch(`/api/admin/booking/${bookingUuid}/bill`, {
+    method: 'POST',
+    body: bill,
+  })
+}