ipg/apps/pg/views.py

from django.contrib import messages
from django.http import HttpResponseRedirect, HttpResponse
from django.urls import reverse
from django.utils.decorators import method_decorator
from django.views.decorators.csrf import csrf_exempt
from django.views.generic import UpdateView
from oauth2_provider.contrib.rest_framework import IsAuthenticatedOrTokenHasScope
from rest_framework import generics
from rest_framework.response import Response
from rest_framework.views import APIView

from utils.commons import calculate_pna_commission
from .constans import StateChoices
from .forms import PaymentRequestForm
from .models import PaymentRequest
from .serializers import PaymentRequestSerializer, CommissionSerializer
from ..gooyal_oauth2.utils import get_application
from ..users.models import User


class CalculateCommissionView(APIView):
    def get(self, request):
        serializer = CommissionSerializer(data=request.query_params)
        serializer.is_valid(raise_exception=True)
        amount = serializer.validated_data['amount']
        commission = calculate_pna_commission(amount)
        serializer = CommissionSerializer({
            "amount": amount,
            "commission": commission
        })
        return Response(serializer.data)

class PaymentRequestCreateApiView(generics.CreateAPIView):
    permission_classes = [IsAuthenticatedOrTokenHasScope]
    serializer_class = PaymentRequestSerializer
    required_scopes = ['wallet.wallet:get_balance']  # TODO: is it good scope?
    model = PaymentRequest

    def perform_create(self, serializer):
        user = self.request.user
        application = get_application(self.request)
        charge_request: PaymentRequest = serializer.save(user=user, application=application)

        # TODO: web view
        # charge_request.charge_wallet_balance()

class ApplicationPaymentRequestCreateApiView(generics.CreateAPIView):
    permission_classes = [IsAuthenticatedOrTokenHasScope]
    serializer_class = PaymentRequestSerializer
    required_scopes = ['ipg.application:request_user_charge']  # TODO: is it good scope?
    model = PaymentRequest

    def perform_create(self, serializer):
        user_uuid = self.kwargs.get('uuid')
        user, created = User.objects.get_or_create(uuid=user_uuid)
        application = get_application(self.request)
        charge_request: PaymentRequest = serializer.save(user=user, application=application)

        # TODO: web view
        # charge_request.charge_wallet_balance()

@method_decorator(csrf_exempt, name='dispatch')
class PaymentRequestView(UpdateView):
    template_name = 'pg/payment-request.html'
    form_class = PaymentRequestForm
    # pk_url_kwarg = 'uuid'
    slug_field = 'uuid'
    slug_url_kwarg = 'uuid'

    # TODO: remove it in future
    def get(self, request, *args, **kwargs):
        charge_request: PaymentRequest = self.get_object()
        charge_request.set_gateway({'pna': True})
        charge_request.save_commission()
        tool = charge_request.get_gateway_tools()
        tool.make_request()
        redirect_url = tool.get_pg_page_url()
        return HttpResponseRedirect(redirect_url)

    # TODO: remove it in future
    def post(self, request, *args, **kwargs):
        charge_request: PaymentRequest = self.get_object()
        charge_request.set_gateway({'pna': True})
        tool = charge_request.get_gateway_tools()
        tool.make_request()
        redirect_url = tool.get_pg_page_url()
        return HttpResponseRedirect(redirect_url)

    def get_queryset(self):
        # return ChargeRequest.objects.all()
        # return Charge.objects.filter(state__in=[StateChoices.CREATED.value, StateChoices.SUCCESS.value])
        return PaymentRequest.objects.filter(state__in=[StateChoices.CREATED.value])

    def form_valid(self, form):
        self.object = form.save()
        charge_request: PaymentRequest = self.get_object()

        charge_request.set_gateway(form.data)

        tool = charge_request.get_gateway_tools()

        tool.make_request()

        redirect_url = tool.get_pg_page_url()

        if redirect_url:
            return HttpResponseRedirect(redirect_url)
        else:
            messages.error(self.request, 'can not redirect to payment gateway')
            messages.info(self.request, 'در پردازش صفحه خطایی وجود دارد.')
            # TODO: redirect to error page
            return HttpResponseRedirect(reverse('pg:payment-confirm-view', kwargs={'uuid': charge_request.uuid}))


@method_decorator(csrf_exempt, name='dispatch')
class PaymentConfirmView(UpdateView):
    template_name = 'pg/payment_failure.html'
    # template_name = 'pg/payment_success.html'
    form_class = PaymentRequestForm
    # pk_url_kwarg = 'uuid'
    slug_field = 'uuid'
    slug_url_kwarg = 'uuid'

    def get_queryset(self):
        return PaymentRequest.objects.all()
        # return Charge.objects.filter(state__in=[StateChoices.CREATED.value, StateChoices.SUCCESS.value])

    def get(self, request, *args, **kwargs):

        print('get')
        print(args)
        print(kwargs)
        self.object = self.get_object()
        tool = self.object.get_gateway_tools()
        tool.confirm_request(request)

        context = self.get_context_data()
        return self.render_to_response(context)

    def post(self, request, *args, **kwargs):
        print("post")
        print(request.POST)
        print(args)
        print(kwargs)
        self.object = self.get_object()

        if 'redirect-to-app' in request.POST:
            response = HttpResponse(status=302)
            response['Location'] = self.object.callback_url + f'?state={self.object.state}'
            return response

        tool = self.object.get_gateway_tools()
        state, message = tool.confirm_request(request)
        if state:
            self.template_name = 'pg/payment_success.html'
        context = self.get_context_data(object=self.object)
        context['message'] = message
        return self.render_to_response(context)


    # def form_valid(self, form):
        # self.object = form.save()
        # charge_request: ChargeRequest = self.get_object()
        # try:
        #
        #     # transaction = Transaction.objects.create(
        #     #     uuid=charge.uuid,
        #     #     payee_id=charge.user.pk,
        #     #     payee_type=1,
        #     #     payer_id=payer_pk,
        #     #     payer_type=2,
        #     #     amount=amount,
        #     #     details={'description': 'شارژ مجازی کیف پول'}
        #     # )
        #     # transaction.submit()
        #     # transaction.verify()
        #     # charge.change_state(from_state=StateChoices.PENDING.value, to_state=StateChoices.SUCCESS.value)
        #
        # except Exception as e:
        #     print(e)
        #     messages.error(self.request, 'خطایی رخ داده است')
        #     charge_request.change_state(from_state=StateChoices.PENDING.value, to_state=StateChoices.EXPECTED_FAILURE.value)
        #
        #     return HttpResponseRedirect(self.get_success_url())