from django.db.models import Q

from oauth2_provider.contrib.rest_framework import TokenHasScope, IsAuthenticatedOrTokenHasScope
from rest_framework import generics, permissions
from rest_framework.response import Response

from apps.transactions.models import Transaction
from apps.transactions.serializers import TransactionSerializer


class TransactionList(generics.ListCreateAPIView):
    permission_classes = [permissions.IsAuthenticated, IsAuthenticatedOrTokenHasScope]
    serializer_class = TransactionSerializer
    required_scopes = []

    def get_queryset(self):
        user = self.request.user
        return Transaction.objects.filter(Q(payee_id=user.id) | Q(payer_id=user.id)).all()

    def perform_create(self, serializer):
        try:
            application = self.request.auth.application
            application_id = application.id
        except:
            application_id = None

        user = self.request.user
        serializer.save(payee=user, application_id=application_id )


class TransactionDetail(generics.RetrieveAPIView):
    permission_classes = [permissions.IsAuthenticated, IsAuthenticatedOrTokenHasScope]
    serializer_class = TransactionSerializer
    lookup_field = 'uuid'
    required_scopes = []

    def get_queryset(self):
        user = self.request.user
        return Transaction.objects.filter(Q(payee_id=user.id) | Q(payer_id=user.id) | Q(payer__isnull=True)).all()


class TransactionPay(generics.RetrieveAPIView):
    permission_classes = [permissions.IsAuthenticated, IsAuthenticatedOrTokenHasScope]
    serializer_class = TransactionSerializer
    lookup_field = 'uuid'
    required_scopes = []

    def get_queryset(self):
        user = self.request.user
        return Transaction.objects.filter(Q(payer_id=user.id) | Q(payer__isnull=True)).all()

    def retrieve(self, request, *args, **kwargs):
        instance = self.get_object()
        instance.pay(payer=self.request.user)
        serializer = self.get_serializer(instance)
        return Response(serializer.data)


class TransactionReceipt(generics.RetrieveAPIView):
    permission_classes = [permissions.IsAuthenticated, IsAuthenticatedOrTokenHasScope]
    serializer_class = TransactionSerializer
    lookup_field = 'uuid'
    required_scopes = []

    def get_queryset(self):
        user = self.request.user
        return Transaction.objects.filter(payer_id=user.id).all()

    def retrieve(self, request, *args, **kwargs):
        instance = self.get_object()
        instance.receipt()
        serializer = self.get_serializer(instance)
        return Response(serializer.data)