add interest

api.saladeaula.digital/app/routes/orders/checkout.py

@@ -19,6 +19,7 @@ from pydantic import (
 from api_gateway import JSONResponse
 from boto3clients import dynamodb_client
 from config import ORDER_TABLE
+from routes.enrollments.enroll import Enrollment
 
 router = Router()
 dyn = DynamoDBPersistenceLayer(ORDER_TABLE, dynamodb_client)
@@ -66,6 +67,7 @@ class Checkout(BaseModel):
     address: Address
     payment_method: Literal['PIX', 'CREDIT_CARD', 'BANK_SLIP', 'MANUAL']
     items: tuple[Item, ...]
+    enrollments: tuple[Enrollment, ...] | None = None
     coupon: Coupon | None = None
     user: User | None = None
     org_id: UUID4 | str | None = None

apps/admin.saladeaula.digital/app/routes/_.$orgid.enrollments.buy/payment.tsx

@@ -29,10 +29,13 @@ import {
   NativeSelect,
   NativeSelectOption
 } from '@repo/ui/components/ui/native-select'
+import { Currency } from '@repo/ui/components/currency'
 
 import { useWizard } from '@/components/wizard'
 import { isName } from '../_.$orgid.users.add/data'
 import type { PaymentMethod } from '@repo/ui/routes/orders/data'
+import type { WizardState } from './route'
+import { applyDiscount } from './discount'
 
 const creditCard = z.object({
   holder_name: z
@@ -52,31 +55,32 @@ const creditCard = z.object({
   cvv: z.string().min(3).max(4)
 })
 
-const formSchema = z.discriminatedUnion(
-  'payment_method',
-  [
+const formSchema = z.discriminatedUnion('payment_method', [
   z.object({
     payment_method: z.literal('PIX')
   }),
+
   z.object({
     payment_method: z.literal('BANK_SLIP')
   }),
+
   z.object({
     payment_method: z.literal('MANUAL')
   }),
+
   z.object({
     payment_method: z.literal('CREDIT_CARD'),
-      credit_card: creditCard
+    credit_card: creditCard,
+    installments: z.coerce.number().int().min(1).max(12)
   })
-  ],
-  { error: 'Escolha uma forma de pagamento' }
-)
+])
 
-type Schema = z.infer<typeof formSchema>
+type Schema = z.input<typeof formSchema>
 
 export type CreditCard = z.infer<typeof creditCard>
 
 type PaymentProps = {
+  state: WizardState
   onSubmit: (value: any) => void | Promise<void>
   payment_method?: PaymentMethod
   credit_card?: CreditCard
@@ -84,6 +88,7 @@ type PaymentProps = {
 
 export function Payment({
   onSubmit,
+  state,
   payment_method: paymentMethodInit,
   credit_card: creditCardInit = undefined
 }: PaymentProps) {
@@ -91,11 +96,23 @@ export function Payment({
   const { control, handleSubmit } = useForm<Schema>({
     defaultValues: {
       payment_method: paymentMethodInit,
+      installments: state?.installments ?? 1,
       credit_card: creditCardInit
     },
     resolver: zodResolver(formSchema)
   })
   const paymentMethod = useWatch({ control, name: 'payment_method' })
+  const subtotal = state.items.reduce(
+    (acc, { course, quantity }) =>
+      acc +
+      (course?.unit_price || 0) *
+        (Number.isFinite(quantity) && quantity > 0 ? quantity : 1),
+    0
+  )
+  const discount = state.coupon
+    ? applyDiscount(subtotal, state.coupon.amount, state.coupon.type) * -1
+    : 0
+  const total = subtotal > 0 ? subtotal + discount : 0
 
   const onSubmit_ = async (data: Schema) => {
     await onSubmit({ credit_card: undefined, ...data })
@@ -147,7 +164,7 @@ export function Payment({
       />
 
       {paymentMethod === 'CREDIT_CARD' ? (
-        <CreditCard control={control} />
+        <CreditCard control={control} total={total} />
       ) : null}
 
       <Separator />
@@ -171,7 +188,13 @@ export function Payment({
   )
 }
 
-export function CreditCard({ control }: { control: Control<Schema> }) {
+export function CreditCard({
+  total,
+  control
+}: {
+  total: number
+  control: Control<Schema>
+}) {
   const currentYear = new Date().getFullYear()
   const years = Array.from({ length: 10 }, (_, i) => currentYear + i)
 
@@ -325,9 +348,58 @@ export function CreditCard({ control }: { control: Control<Schema> }) {
                 )}
               />
             </FieldSet>
+
+            <Controller
+              control={control}
+              name="installments"
+              defaultValue={1}
+              render={({ field, fieldState }) => (
+                <Field data-invalid={fieldState.invalid}>
+                  <FieldLabel htmlFor={field.name}>Parcelas</FieldLabel>
+                  <NativeSelect
+                    id={field.name}
+                    value={String(field.value)}
+                    onChange={field.onChange}
+                    aria-invalid={fieldState.invalid}
+                  >
+                    {Array.from({ length: 12 }, (_, index) => {
+                      const installment = index + 1 // 1 -> 12
+
+                      if (installment === 1) {
+                        return (
+                          <NativeSelectOption key={installment} value={1}>
+                            <Currency>{total}</Currency> à vista
+                          </NativeSelectOption>
+                        )
+                      }
+
+                      const value =
+                        calcInterest(total, installment) / installment
+
+                      return (
+                        <NativeSelectOption
+                          key={installment}
+                          value={installment}
+                        >
+                          {installment}x <Currency>{value}</Currency> com juros
+                        </NativeSelectOption>
+                      )
+                    })}
+                  </NativeSelect>
+                </Field>
+              )}
+            />
           </FieldSet>
         </FieldGroup>
       </CardContent>
     </Card>
   )
 }
+
+export const calcInterest = (total: number, installment: number) => {
+  const rate2to6 = 0.055
+  const rate7to12 = 0.0608
+  const rate = installment >= 7 ? rate7to12 : rate2to6
+
+  return total * ((1 - 0.0382) / (1 - rate))
+}

apps/admin.saladeaula.digital/app/routes/_.$orgid.enrollments.buy/review.tsx

@@ -57,6 +57,7 @@ import {
   InputGroupButton,
   InputGroupInput
 } from '@repo/ui/components/ui/input-group'
+import { calcInterest } from './payment'
 
 type ReviewProps = {
   state: WizardState
@@ -79,6 +80,13 @@ export function Review({ state, onSubmit }: ReviewProps) {
     ? applyDiscount(subtotal, coupon.amount, coupon.type) * -1
     : 0
   const total = subtotal > 0 ? subtotal + discount : 0
+  const installments = state.installments
+  const interest_amount =
+    state.payment_method === 'CREDIT_CARD' &&
+    typeof installments === 'number' &&
+    installments > 1
+      ? calcInterest(total, installments) - total
+      : 0
 
   return (
     <>
@@ -117,6 +125,8 @@ export function Review({ state, onSubmit }: ReviewProps) {
               )
             })}
           </TableBody>
+
+          {/* Summary */}
           <TableFooter>
             <TableRow>
               <TableCell className="text-right" colSpan={3}>
@@ -126,6 +136,7 @@ export function Review({ state, onSubmit }: ReviewProps) {
                 <Currency>{subtotal}</Currency>
               </TableCell>
             </TableRow>
+            {/* Discount */}
             <TableRow>
               <TableCell className="text-right" colSpan={3}>
                 Descontos
@@ -134,12 +145,26 @@ export function Review({ state, onSubmit }: ReviewProps) {
                 <Currency>{discount}</Currency>
               </TableCell>
             </TableRow>
+            {/* Interest */}
+            {interest_amount ? (
+              <TableRow>
+                <TableCell className="text-right" colSpan={3}>
+                  Juros
+                </TableCell>
+                <TableCell>
+                  <Currency>{interest_amount}</Currency>
+                </TableCell>
+              </TableRow>
+            ) : (
+              <></>
+            )}
+            {/* Total */}
             <TableRow>
               <TableCell className="text-right" colSpan={3}>
                 Total
               </TableCell>
               <TableCell>
-                <Currency>{total}</Currency>
+                <Currency>{total + interest_amount}</Currency>
               </TableCell>
             </TableRow>
           </TableFooter>

apps/admin.saladeaula.digital/app/routes/_.$orgid.enrollments.buy/route.tsx

@@ -43,6 +43,7 @@ export type WizardState = {
   items: Item[]
   enrollments: Enrollment[]
   coupon?: Coupon
+  installments?: number
   payment_method?: PaymentMethod
   credit_card?: CreditCard
 }
@@ -54,6 +55,7 @@ const emptyWizard: WizardState = {
   enrollments: [],
   coupon: undefined,
   payment_method: undefined,
+  installments: undefined,
   credit_card: undefined
 }
 
@@ -204,6 +206,7 @@ export default function Route({
               {/* Payment */}
               <WizardStep name="payment">
                 <Payment
+                  state={state}
                   payment_method={state.payment_method}
                   credit_card={state.credit_card}
                   onSubmit={(data: any) => {