from decimal import Decimal

from django.core.exceptions import ObjectDoesNotExist

from django.core.exceptions import ValidationError

from django.db import transaction

from django.db.models import Sum

from django.utils import timezone

from registrasion.models import commerce

from registrasion.models import conditions

from registrasion.models import people

from cart import CartController

from credit_note import CreditNoteController

from for_id import ForId

class InvoiceController(ForId, object):

    __MODEL__ = commerce.Invoice

                price=cls.resolve_discount_value(item) * -1,

                product=item.product,

            )

            line_items.append(line_item)

            invoice_value += line_item.quantity * line_item.price

        commerce.LineItem.objects.bulk_create(line_items)

        invoice.value = invoice_value

        invoice.save()

        return invoice

    def can_view(self, user=None, access_code=None):

        ''' Returns true if the accessing user is allowed to view this invoice,

        or if the given access code matches this invoice's user's access code.

        '''

        if user == self.invoice.user:

            return True

        if user.is_staff:

            return True

        if self.invoice.is_void:

            raise ValidationError("Void invoices cannot be refunded")

        # Raises a credit note fot the value of the invoice.

        amount = self.total_payments()

        if amount == 0:

            self.void()

            return

        CreditNoteController.generate_from_invoice(self.invoice, amount)

        self.update_status()