Add basics of eboutic, still need to implement the ET API to get bank payment

eboutic/models.py

@@ -0,0 +1,68 @@
+from django.db import models, DataError
+from django.utils.translation import ugettext_lazy as _
+
+from accounting.models import CurrencyField
+from counter.models import Counter, Product
+from core.models import User
+
+class Eboutic(Counter):
+    class Meta:
+        proxy = True
+
+class Basket(models.Model):
+    """
+    Basket is built when the user validate its session basket and asks for payment
+    """
+    user = models.ForeignKey(User, related_name='baskets', verbose_name=_('user'), blank=False)
+    date = models.DateTimeField(_('date'), auto_now=True)
+
+    def get_total(self):
+        total = 0
+        for i in self.items.all():
+            total += i.quantity * i.product_unit_price
+        return total
+
+class Invoice(models.Model):
+    """
+    Invoices are generated once the payment has been validated
+    """
+    user = models.ForeignKey(User, related_name='invoices', verbose_name=_('user'), blank=False)
+    date = models.DateTimeField(_('date'), auto_now=True)
+    payment_method = models.CharField(choices=[('CREDIT_CARD', _('Credit card')), ('SITH_ACCOUNT', _('Sith account'))],
+            max_length=20, verbose_name=_('payment method'))
+    validated = models.BooleanField(_("validated"), default=False)
+
+
+    def get_total(self):
+        total = 0
+        for i in self.items.all():
+            total += i.quantity * i.product_unit_price
+        return total
+
+    def validate(self, *args, **kwargs):
+        if self.validated:
+            raise DataError(_("Invoice already validated"))
+        if self.payment_method == "SITH_ACCOUNT":
+            self.user.customer.amount -= self.get_total()
+            self.user.customer.save()
+            self.validated = True
+            self.save()
+
+
+
+class AbstractBaseItem(models.Model):
+    product_name = models.CharField(_('product name'), max_length=255)
+    product_unit_price = CurrencyField(_('unit price'))
+    quantity = models.IntegerField(_('quantity'))
+
+    class Meta:
+        abstract = True
+
+    def __str__(self):
+        return "Item: %s (%s) x%d" % (self.product_name, self.product_unit_price, self.quantity)
+
+class BasketItem(AbstractBaseItem):
+    basket = models.ForeignKey(Basket, related_name='items', verbose_name=_('basket'))
+
+class InvoiceItem(AbstractBaseItem):
+    invoice = models.ForeignKey(Invoice, related_name='items', verbose_name=_('invoice'))