Implement voucher per event and for all events of an organizer: apply voucher in billing setting

pyproject.toml

@@ -102,7 +102,8 @@ dependencies = [
         'eventyay-paypal @ git+https://[email protected]/fossasia/eventyay-tickets-paypal.git@master',
         'django_celery_beat==2.7.0',
         'cron-descriptor==1.4.5',
-        'django-allauth[socialaccount]==65.3.0'
+        'django-allauth[socialaccount]==65.3.0',
+        'pydantic==2.10.4'
 ]
 
 [project.optional-dependencies]

src/pretix/base/migrations/0007_billinginvoice_final_ticket_fee_and_more.py

@@ -0,0 +1,29 @@
+# Generated by Django 5.1.4 on 2024-12-26 08:14
+
+import django.db.models.deletion
+from django.db import migrations, models
+
+
+class Migration(migrations.Migration):
+
+    dependencies = [
+        ('pretixbase', '0006_create_invoice_voucher'),
+    ]
+
+    operations = [
+        migrations.AddField(
+            model_name='billinginvoice',
+            name='final_ticket_fee',
+            field=models.DecimalField(decimal_places=2, default=0, max_digits=10),
+        ),
+        migrations.AddField(
+            model_name='billinginvoice',
+            name='voucher_discount',
+            field=models.DecimalField(decimal_places=2, default=0, max_digits=10),
+        ),
+        migrations.AddField(
+            model_name='organizerbillingmodel',
+            name='invoice_voucher',
+            field=models.ForeignKey(null=True, on_delete=django.db.models.deletion.CASCADE, related_name='billing', to='pretixbase.invoicevoucher'),
+        )
+    ]

src/pretix/base/models/billing.py

@@ -30,6 +30,8 @@ class BillingInvoice(LoggedModel):
     currency = models.CharField(max_length=3)
 
     ticket_fee = models.DecimalField(max_digits=10, decimal_places=2)
+    final_ticket_fee = models.DecimalField(max_digits=10, decimal_places=2, default=0)
+    voucher_discount = models.DecimalField(max_digits=10, decimal_places=2, default=0)
     payment_method = models.CharField(max_length=20, null=True, blank=True)
     paid_datetime = models.DateTimeField(null=True, blank=True)
     note = models.TextField(null=True, blank=True)

src/pretix/base/models/organizer.py

@@ -464,6 +464,13 @@ class OrganizerBillingModel(models.Model):
         verbose_name=_("Tax ID"),
     )
 
+    invoice_voucher = models.ForeignKey(
+        "pretixbase.InvoiceVoucher",
+        on_delete=models.CASCADE,
+        related_name="billing",
+        null=True
+    )
+
     stripe_customer_id = models.CharField(
         max_length=255,
         verbose_name=_("Stripe Customer ID"),

src/pretix/base/models/vouchers.py

@@ -583,3 +583,27 @@ def is_active(self):
         if self.valid_until and self.valid_until < now():
             return False
         return True
+
+    def calculate_price(self, original_price: Decimal, max_discount: Decimal=None, event: Event=None) -> Decimal:
+        """
+        Returns how the price given in original_price would be modified if this
+        voucher is applied, i.e. replaced by a different price or reduced by a
+        certain percentage. If the voucher does not modify the price, the
+        original price will be returned.
+        """
+        if self.value is not None:
+            if self.price_mode == 'set':
+                p = self.value
+            elif self.price_mode == 'subtract':
+                p = max(original_price - self.value, Decimal('0.00'))
+            elif self.price_mode == 'percent':
+                p = round_decimal(original_price * (Decimal('100.00') - self.value) / Decimal('100.00'))
+            else:
+                p = original_price
+            places = settings.CURRENCY_PLACES.get(event.currency, 2)
+            if places < 2:
+                p = p.quantize(Decimal('1') / 10 ** places, ROUND_HALF_UP)
+            if max_discount is not None:
+                p = max(p, original_price - max_discount)
+            return p
+        return original_price

src/pretix/control/forms/organizer_forms/organizer_form.py

@@ -5,6 +5,7 @@
 
 from pretix.base.forms import I18nModelForm
 from pretix.base.models.organizer import Organizer, OrganizerBillingModel
+from pretix.base.models.vouchers import InvoiceVoucher
 from pretix.helpers.countries import CachedCountries, get_country_name
 from pretix.helpers.stripe_utils import (
     create_stripe_customer, update_customer_info,
@@ -44,6 +45,7 @@ class Meta:
             "country",
             "preferred_language",
             "tax_id",
+            "invoice_voucher"
         ]
 
     primary_contact_name = forms.CharField(
@@ -132,6 +134,14 @@ class Meta:
         required=False,
     )
 
+    invoice_voucher = forms.CharField(
+        label=_("Invoice Voucher"),
+        help_text=_("If you have a voucher code, enter it here."),
+        max_length=255,
+        widget=forms.TextInput(attrs={"placeholder": ""}),
+        required=False,
+    )
+
     def __init__(self, *args, **kwargs):
         self.organizer = kwargs.pop("organizer", None)
         self.warning_message = None
@@ -162,6 +172,25 @@ def validate_vat_number(self, country_code, vat_number):
         result = pyvat.is_vat_number_format_valid(vat_number, country_code)
         return result
 
+    def clean_invoice_voucher(self):
+        voucher_code = self.cleaned_data['invoice_voucher']
+        if not voucher_code:
+            return None
+
+        voucher_instance = InvoiceVoucher.objects.filter(code=voucher_code).first()
+        if not voucher_instance:
+            raise forms.ValidationError("Voucher code not found!")
+
+        if not voucher_instance.is_active():
+            raise forms.ValidationError("The voucher code has either expired or reached its usage limit.")
+
+        if voucher_instance.limit_organizer.exists():
+            limit_organizer = voucher_instance.limit_organizer.values_list("id", flat=True)
+            if self.organizer.id not in limit_organizer:
+                raise forms.ValidationError("Voucher code is not valid for this organizer!")
+
+        return voucher_instance
+
     def clean(self):
         cleaned_data = super().clean()
         country_code = cleaned_data.get("country")
@@ -174,14 +203,16 @@ def clean(self):
                 self.add_error("tax_id", _("Invalid VAT number for {}".format(country_name)))
 
     def save(self, commit=True):
+        def set_attribute(instance):
+            for field in self.Meta.fields:
+                setattr(instance, field, self.cleaned_data[field])
+
         instance = OrganizerBillingModel.objects.filter(
             organizer_id=self.organizer.id
         ).first()
 
         if instance:
-            for field in self.Meta.fields:
-                setattr(instance, field, self.cleaned_data[field])
-
+            set_attribute(instance)
             if commit:
                 update_customer_info(
                     instance.stripe_customer_id,
@@ -191,9 +222,7 @@ def save(self, commit=True):
                 instance.save()
         else:
             instance = OrganizerBillingModel(organizer_id=self.organizer.id)
-            for field in self.Meta.fields:
-                setattr(instance, field, self.cleaned_data[field])
-
+            set_attribute(instance)
             if commit:
                 stripe_customer = create_stripe_customer(
                     email=self.cleaned_data.get("primary_contact_email"),

src/pretix/control/templates/pretixcontrol/organizers/billing.html

@@ -28,6 +28,7 @@ <h1>{% trans "Billing settings" %}</h1>
                 {% bootstrap_field form.city layout="control" %}
                 {% bootstrap_field form.country layout="control" %}
                 {% bootstrap_field form.tax_id layout="control" %}
+                {% bootstrap_field form.invoice_voucher layout="control" %}
                 {% bootstrap_field form.preferred_language layout="control" %}
                 <div class="form-group submit-group">
                     <button type="submit" class="btn btn-primary btn-save">

src/pretix/eventyay_common/billing_invoice.py

@@ -164,15 +164,17 @@ def generate_invoice_pdf(billing_invoice, organizer_billing_info):
             Paragraph("#", row_header_style),
             Paragraph("DESCRIPTION", row_header_style),
             Paragraph("PRICE", row_header_style),
+            Paragraph("DISCOUNT", row_header_style),
             Paragraph("QUANTITY", row_header_style),
             Paragraph("AMOUNT", row_header_style),
         ],
         [
             "1",
             "Ticket fee for " + f"{billing_invoice.monthly_bill.strftime('%B %Y')}",
             f"{billing_invoice.ticket_fee} {billing_invoice.currency}",
+            f"{billing_invoice.voucher_discount} {billing_invoice.currency}",
             "1",
-            f"{billing_invoice.ticket_fee} {billing_invoice.currency}",
+            f"{billing_invoice.final_ticket_fee} {billing_invoice.currency}",
         ],
     ]
     item_table = Table(
@@ -195,12 +197,12 @@ def generate_invoice_pdf(billing_invoice, organizer_billing_info):
 
     # Footer Totals Section
     totals_data = [
-        ["SUBTOTAL", f"{billing_invoice.ticket_fee}"],
+        ["SUBTOTAL", f"{billing_invoice.final_ticket_fee}"],
         ["TAX", "0"],
         [
             Paragraph("<b>GRAND TOTAL</b>", bold_style),
             Paragraph(
-                f"<b>{billing_invoice.ticket_fee} {billing_invoice.currency}</b>",
+                f"<b>{billing_invoice.final_ticket_fee} {billing_invoice.currency}</b>",
                 bold_style,
             ),
         ],

src/pretix/eventyay_common/schemas/billing.py

@@ -0,0 +1,8 @@
+from decimal import Decimal
+
+from pydantic import BaseModel, Field
+
+
+class CollectBillingResponse(BaseModel):
+    status: bool = Field(description="Status of collecting billing invoice", default=False)
+    voucher_discount: Decimal = Field(default=Decimal('0.00'))