322 lines
8.5 KiB
Python
322 lines
8.5 KiB
Python
import re
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from datetime import date, datetime, timedelta
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from decimal import Decimal
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from enum import Enum
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from functools import reduce
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from http import HTTPStatus
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from typing import Any, Literal
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from uuid import uuid4
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from aws_lambda_powertools.event_handler.api_gateway import Router
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from aws_lambda_powertools.event_handler.exceptions import (
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NotFoundError,
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)
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from layercake.dateutils import now, ttl
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from layercake.dynamodb import DynamoDBPersistenceLayer, KeyPair, SortKey
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from layercake.extra_types import CnpjStr, CpfStr, CreditCard, NameStr
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from pydantic import (
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UUID4,
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BaseModel,
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ConfigDict,
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EmailStr,
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Field,
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field_validator,
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model_validator,
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)
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from api_gateway import JSONResponse
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from boto3clients import dynamodb_client
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from config import DUE_DAYS, ORDER_TABLE
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from routes.enrollments.enroll import Enrollment
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router = Router()
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dyn = DynamoDBPersistenceLayer(ORDER_TABLE, dynamodb_client)
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class CouponNotFoundError(NotFoundError): ...
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class PaymentMethod(str, Enum):
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PIX = 'PIX'
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CREDIT_CARD = 'CREDIT_CARD'
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BANK_SLIP = 'BANK_SLIP'
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MANUAL = 'MANUAL'
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class User(BaseModel):
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id: UUID4 | str
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name: NameStr
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class Address(BaseModel):
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model_config = ConfigDict(str_strip_whitespace=True)
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postcode: str
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address1: str
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address2: str | None = None
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neighborhood: str
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city: str
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state: str
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@field_validator('postcode')
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@classmethod
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def ensure_numbers(cls, v: str) -> str:
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return re.sub(r'\D', '', v)
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class Item(BaseModel):
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id: UUID4
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name: str
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unit_price: Decimal
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quantity: int = 1
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class Coupon(BaseModel):
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code: str
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type: Literal['PERCENT', 'FIXED']
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amount: Decimal
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class Checkout(BaseModel):
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model_config = ConfigDict(
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str_strip_whitespace=True,
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use_enum_values=True,
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)
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id: UUID4 = Field(default_factory=uuid4)
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name: str
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email: EmailStr
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address: Address
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payment_method: PaymentMethod
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items: tuple[Item, ...]
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enrollments: tuple[Enrollment, ...] = tuple()
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coupon: Coupon | None = None
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org_id: UUID4 | str | None = None
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user_id: UUID4 | str | None = None
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cnpj: CnpjStr | None = None
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cpf: CpfStr | None = None
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created_by: User | None = None
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credit_card: CreditCard | None = None
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installments: int | None = Field(None, ge=1, le=12)
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@model_validator(mode='after')
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def verify_fields(self):
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if not any([self.cnpj, self.cpf]):
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raise ValueError('cnpj or cpf is required')
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if self.cnpj is not None:
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if self.org_id is None:
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raise ValueError('org_id is missing')
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if self.created_by is None:
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raise ValueError('created_by is missing')
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if self.cpf is not None and self.user_id is None:
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raise ValueError('user_id is missing')
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return self
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def model_dump(self, **kwargs) -> dict[str, Any]:
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return super().model_dump(
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exclude_none=True,
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exclude={
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'items',
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'address',
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'created_by',
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'coupon',
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'credit_card',
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'enrollments',
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},
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**kwargs,
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)
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@router.post('/')
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def checkout(payload: Checkout):
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now_ = now()
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order_id = payload.id
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org_id = payload.org_id
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address = payload.address
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credit_card = payload.credit_card
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items = payload.items
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enrollments = payload.enrollments
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coupon = payload.coupon
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payment_method = payload.payment_method
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installments = payload.installments
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subtotal = _sum_items(items)
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due_date = (
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_calc_due_date(now_, _get_due_days(org_id) if org_id else DUE_DAYS)
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if payment_method == 'BANK_SLIP'
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else now_ + timedelta(hours=1)
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)
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discount = (
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_apply_discount(subtotal, coupon.amount, coupon.type) * -1 if coupon else 0
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)
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total = subtotal + discount if subtotal > 0 else 0
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interest_amount = (
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_calc_interest(total, installments) - total
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if payment_method == 'CREDIT_CARD' and installments
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else 0
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)
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with dyn.transact_writer() as transact:
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transact.put(
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item={
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'id': order_id,
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'sk': '0',
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'status': 'PENDING',
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'subtotal': subtotal,
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'total': total + interest_amount,
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'discount': discount,
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'due_date': due_date,
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# Post-migration (orders): rename `create_date` to `created_at`
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'create_date': now_,
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}
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| ({'coupon': coupon.code} if coupon else {})
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| (
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{
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'installments': payload.installments,
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'interest_amount': interest_amount,
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}
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if payload.installments
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else {}
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)
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| payload.model_dump()
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)
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transact.put(
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item={
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'id': order_id,
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'sk': 'ITEMS',
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'items': [item.model_dump() for item in items],
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'created_at': now_,
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}
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)
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transact.put(
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item={
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'id': order_id,
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'sk': 'ADDRESS',
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'created_at': now_,
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}
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| address.model_dump()
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)
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if credit_card:
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transact.put(
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item={
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'id': order_id,
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'sk': 'CREDIT_CARD',
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'brand': credit_card.brand,
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'last4': credit_card.last4,
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'created_at': now_,
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}
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)
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transact.put(
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item={
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'id': 'TRANSACTION',
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'sk': order_id,
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'ttl': ttl(start_dt=now_, minutes=5),
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'created_at': now_,
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}
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| credit_card.model_dump(),
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)
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if coupon:
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transact.put(
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item={
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'id': order_id,
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'sk': 'METADATA#COUPON',
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'created_at': now_,
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}
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| coupon.model_dump()
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)
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transact.condition(
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key=KeyPair('COUPON', coupon.code),
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cond_expr='attribute_exists(sk) \
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AND discount_type = :type \
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AND discount_amount = :amount',
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expr_attr_values={
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':type': coupon.type,
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':amount': coupon.amount,
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},
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exc_cls=CouponNotFoundError,
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)
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for enrollment in enrollments:
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transact.put(
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item={
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'id': order_id,
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'sk': f'ENROLLMENT#{enrollment.id}',
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'status': 'PENDING',
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'created_at': now_,
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}
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| enrollment.model_dump(exclude={'id'})
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)
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return JSONResponse(
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body={'id': order_id},
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status_code=HTTPStatus.CREATED,
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)
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def _sum_items(items: tuple[Item, ...]):
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def sum(total: Decimal, item: Item) -> Decimal:
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return total + item.unit_price * item.quantity
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return reduce(sum, items, Decimal(0))
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def _calc_interest(total, installments: int) -> Decimal:
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rate2to6 = 0.055
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rate7to12 = 0.0608
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rate = rate7to12 if installments >= 7 else rate2to6
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return total * Decimal((1 - 0.0382) / (1 - rate))
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def _apply_discount(
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subtotal: Decimal,
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discount_amount: Decimal,
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discount_type: Literal['FIXED', 'PERCENT'],
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) -> Decimal:
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if subtotal <= Decimal('0'):
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return Decimal('0')
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amount = (
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(subtotal * discount_amount) / Decimal('100')
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if discount_type == 'PERCENT'
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else discount_amount
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)
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return min(amount, subtotal)
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def _calc_due_date(
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start_date: datetime,
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business_days: int,
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holidays: set[date] | None = None,
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) -> datetime:
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holidays = holidays or set()
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current_dt = start_date
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while business_days > 0:
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current_dt += timedelta(days=1)
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if current_dt.weekday() < 5 and current_dt.date() not in holidays:
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business_days -= 1
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return current_dt
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def _get_due_days(
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org_id: str | UUID4,
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default: int = DUE_DAYS,
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) -> int:
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return dyn.collection.get_item(
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KeyPair(
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pk=str(org_id),
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sk=SortKey('METADATA#PAYMENT_POLICY', path_spec='due_days'),
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),
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raise_on_error=False,
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default=default,
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)
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