Add invoicing

aleksis/apps/paweljong/models.py

 from datetime import datetime
 
+from django.contrib.contenttypes.models import ContentType
 from django.db import models
 from django.urls import reverse
 from django.utils.text import slugify
@@ -8,7 +9,10 @@ from django.utils.translation import gettext_lazy as _
 
 from ckeditor.fields import RichTextField
 from django_iban.fields import IBANField
+from payments import PurchasedItem
 
+from aleksis.apps.tezor.models.base import Client
+from aleksis.apps.tezor.models.invoice import Invoice, InvoiceGroup
 from aleksis.core.mixins import ExtensibleModel
 from aleksis.core.models import Group, Person
 from aleksis.core.util.core_helpers import generate_random_code, get_site_preferences
@@ -261,6 +265,49 @@ class EventRegistration(ExtensibleModel):
         blank=True,
     )
 
+    def get_invoice(self):
+        # FIXME Maybe do not hard-code this
+        client, __ = Client.objects.get_or_create(name="Teckids e.V.")
+        group, __ = InvoiceGroup.objects.get_or_create(name="Hack'n'Fun-Veranstaltungen", client=client)
+
+        invoice, __ = Invoice.objects.get_or_create(for_content_type=ContentType.objects.get_for_model(self), for_object_id=self.pk, defaults={
+            "group": group,
+            "variant": "dummy",
+            "transaction_id": f"HNF-{self.date_registered.strftime('%Y-%m')}-{self.id}",
+            "currency": "EUR",
+            "total": self._get_total_amount()[0],
+            "tax": self._get_total_amount()[1],
+            "description": _("Participation of {} in event {}").format(self.person.addressing_name, self.event.display_name),
+            "billing_first_name": self.person.first_name,
+            "billing_last_name": self.person.last_name,
+            "billing_address_1": f"{self.person.street} {self.person.housenumber}",
+            "billing_address_city": self.person.place,
+            "billing_address_postcode": self.person.postal_code,
+            "billing_email": self.perosn.email,
+        })
+
+        return invoice
+
+    def get_purchased_items(self):
+        # FIXME Maybe do not hard-code the tax rate and currency
+        # First, return main amount
+        yield PurchasedItem(name=self.event.display_name, quantity=1, price=self.event.cost, currency="EUR", sku="", tax_rate=7)
+
+        # If a dnoation was made, add it
+        if self.donation:
+            yield PurchasedItem(name=_("Social Sponsoring / Extra Donation"), quantity=1, price=self.donation, currency="EUR", sku="", tax_rate=0)
+
+        # If a voucher was used, add it
+        if self.voucher:
+            yield PurchasedItem(name=_("Voucher / Granted discount"), quantity=1, price=-1 * self.voucher.discount * self.event.cost / 100, currency="EUR", sku="", tax_rate=7)
+
+    def _get_total_amount(self):
+        total, tax = 0, 0
+        for item in self.get_purchased_items():
+            total += item.price
+            tax += item.price * item.tax_rate / 100
+        return total, tax
+
     def __str__(self) -> str:
         return f"{self.event}, {self.person.first_name} {self.person.last_name}"
 

pyproject.toml

@@ -30,6 +30,7 @@ django-iban-field = "^0.8"
 django-formtools = "^2.3"
 django-starfield = "^1.0"
 aleksis-app-postbuero = "1.0+20220218233830.a212f707"
+aleksis-app-tezor = "^1.0.dev0"
 
 [tool.poetry.dev-dependencies]
 aleksis-builddeps = "*"