switch to prisma

helpers/bill.ts

@@ -1,79 +1,27 @@
-import { MILAGE_TARIFS } from '../db/enums'
-import { AdditionalCost, Bill } from '../db/bill'
+import { Bill, Prisma } from '@prisma/client'
 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 {
-  if (tarif === MILAGE_TARIFS.NOCHARGE) {
-    return 0
-  }
-
-  if (km <= 0) {
-    return 0
-  }
-
-  let rate: number
-
-  if (tarif === MILAGE_TARIFS.EXTERN) {
-    if (km <= 200) {
-      rate = 0.42
-    } else if (km <= 1000) {
-      rate = 0.25
-    } else if (km <= 2000) {
-      rate = 0.2
-    } else {
-      rate = 0.18
-    }
-  }
-
-  if (tarif === MILAGE_TARIFS.INTERN) {
-    if (km <= 200) {
-      rate = 0.37
-    } else if (km <= 1000) {
-      rate = 0.22
-    } else if (km <= 2000) {
-      rate = 0.15
-    } else {
-      rate = 0.13
-    }
-  }
-
-  if (rate === undefined) {
-    throw Error('Unable to determine rate')
-  }
-
-  return roundToCent(km * rate)
-}
 
 export function getBillTotal({
   tarif,
   milage,
   additionalCosts,
 }: {
-  tarif: MILAGE_TARIFS
+  tarif: Prisma.Decimal
   milage?: number
-  additionalCosts: AdditionalCost[]
-}): number {
-  const milageCosts = getMilageCosts({ tarif, km: milage })
+  additionalCosts: Prisma.AdditionalCostsCreateInput[]
+}): Prisma.Decimal {
+  const milageCosts = tarif.mul(milage)
   const additionalCostsSum = additionalCosts
-    .map(({ value }) => value)
-    .reduce((acc: number, value: number) => acc + value, 0)
+    .reduce((acc, {value} ) => (value as Prisma.Decimal).plus(acc), new Prisma.Decimal(0))
 
-  return roundToCent(milageCosts + additionalCostsSum)
+
+  return additionalCostsSum.add(milageCosts).toDecimalPlaces(2);
 }
 
 export async function createBill(
   bookingUuid: string,
-  bill: Bill
+  bill: Prisma.BillCreateInput
 ): Promise<Bill> {
   return fetch(`/api/bookings/${bookingUuid}/bill`, {
     method: 'POST',
@@ -83,7 +31,7 @@ export async function createBill(
 
 export async function patchBill(
   bookingUuid: string,
-  bill: Bill
+  bill: Prisma.BillUpdateInput
 ): Promise<Bill> {
   return fetch(`/api/bookings/${bookingUuid}/bill`, {
     method: 'POST',