from rest_framework import viewsets, permissions
from rest_framework.response import Response
from django.db import transaction

from .models import MatrixServiceProduct
from .serializers import MatrixServiceProductSerializer

from uncloud_pay.helpers import ProductViewSet
from uncloud_pay.models import Order
from uncloud_vm.models import VMProduct

class MatrixServiceProductViewSet(ProductViewSet):
    permission_classes = [permissions.IsAuthenticated]
    serializer_class = MatrixServiceProductSerializer

    def get_queryset(self):
        return MatrixServiceProduct.objects.filter(owner=self.request.user)

    @transaction.atomic
    def create(self, request):
        # Extract serializer data.
        serializer = self.get_serializer(data=request.data)
        serializer.is_valid(raise_exception=True)
        order_recurring_period = serializer.validated_data.pop("recurring_period")

        # Create base order.
        order = Order.objects.create(
                recurring_period=order_recurring_period,
                owner=request.user
                )
        order.save()

        # Create unerderlying VM.
        # TODO: move this logic to a method for use with other
        # products.
        vm_data = serializer.validated_data.pop('vm')
        vm_data['owner'] = request.user
        vm_data['order'] = order
        vm = VMProduct.objects.create(**vm_data)

        # XXX: Move this to some kind of on_create hook in parent
        # Product class?
        order.add_record(
                vm.one_time_price,
                vm.recurring_price(order.recurring_period),
                vm.description)

        # Create service.
        service = serializer.save(
                order=order,
                owner=self.request.user,
                vm=vm)

        # XXX: Move this to some kind of on_create hook in parent
        # Product class?
        order.add_record(
                service.one_time_price,
                service.recurring_price(order.recurring_period),
                service.description)

        return Response(serializer.data)