Implement payment backends and interaction

Advances #3 (closed)

aleksis/apps/tezor/models/invoice.py

 from django.contrib.contenttypes.fields import GenericForeignKey
 from django.contrib.contenttypes.models import ContentType
 from django.db import models
+from django.shortcuts import reverse
 from django.utils.translation import gettext_lazy as _
 
 from djmoney.models.fields import CurrencyField, MoneyField
@@ -32,6 +33,13 @@ class InvoiceGroup(ExtensibleModel):
 
 
 class Invoice(BasePayment, PureDjangoModel):
+    VARIANT_DISPLAY = {
+        "paypal": (_("PayPal"), "logos:paypal"),
+        "sofort": (_("Klarna / Sofort"), "simple-icons:klarna"),
+        "pledge": (_("Payment pledge / manual payment"), "mdi:hand-coin"),
+        "sdd": (_("SEPA Direct Debit"), "mdi:bank-transfer"),
+    }
+
     group = models.ForeignKey(
         InvoiceGroup, verbose_name=_("Invoice group"), related_name="invoices", on_delete=models.SET_NULL, null=True
     )
@@ -42,12 +50,26 @@ class Invoice(BasePayment, PureDjangoModel):
     for_object_id = models.PositiveIntegerField()
     for_object = GenericForeignKey("for_content_type", "for_object_id")
 
+    def get_variant_name(self):
+        return self.__class__.VARIANT_DISPLAY[self.variant][0]
+
+    def get_variant_icon(self):
+        return self.__class__.VARIANT_DISPLAY[self.variant][1]
+
     def get_purchased_items(self):
         return self.for_object.get_purchased_items()
 
+    def get_person(self):
+        if hasattr(self.for_object, "person"):
+            return self.for_object.person
+        elif hasattr(self.for_object, "get_person"):
+            return self.for_object.get_person()
+
+        return None
+
     class Meta:
         constraints = [
-            models.UniqueConstraint(fields=["transaction_id", "group"], name="number_uniq_per_group")
+            models.UniqueConstraint(fields=["number", "group"], name="number_uniq_per_group")
         ]
 
     @property
@@ -77,3 +99,9 @@ class Invoice(BasePayment, PureDjangoModel):
         })
 
         return TotalsTable(values)
+
+    def get_success_url(self):
+        return reverse("invoice_by_token", kwargs={"slug": self.token})
+
+    def get_failure_url(self):
+        return reverse("invoice_by_token", kwargs={"slug": self.token})