end of day

apps/promotions/admin.py

@@ -2,9 +2,10 @@ from functools import update_wrapper
 
 from django.contrib import admin
 
-from .models import Promotion, Plan
+from .models import Promotion, Plan, Event
 
 
 admin.site.register(Plan)
 admin.site.register(Promotion)
+admin.site.register(Event)
 

apps/promotions/migrations/0005_event_plan_event_list.py

@@ -0,0 +1,32 @@
+# Generated by Django 5.2.6 on 2025-09-16 17:32
+
+import uuid
+from django.db import migrations, models
+
+
+class Migration(migrations.Migration):
+
+    dependencies = [
+        ('promotions', '0004_promotion_base_amount'),
+    ]
+
+    operations = [
+        migrations.CreateModel(
+            name='Event',
+            fields=[
+                ('uuid', models.UUIDField(db_index=True, default=uuid.uuid4, editable=False, primary_key=True, serialize=False, unique=True)),
+                ('created_at', models.DateTimeField(auto_now_add=True, db_index=True)),
+                ('updated_at', models.DateTimeField(auto_now=True, db_index=True)),
+                ('label', models.CharField(db_index=True, max_length=255)),
+                ('details', models.JSONField()),
+            ],
+            options={
+                'abstract': False,
+            },
+        ),
+        migrations.AddField(
+            model_name='plan',
+            name='event_list',
+            field=models.JSONField(default=list),
+        ),
+    ]

apps/promotions/models.py

@@ -16,15 +16,19 @@ class EventQuerySet(models.QuerySet):
 
 class Event(BaseModel):
     label = models.CharField(max_length=255, db_index=True)
-    details = models.JSONField()  # from to amount application user etc
+    data = models.JSONField()  # from to amount application user etc
 
     objects = EventQuerySet.as_manager()
 
+    def __str__(self):
+        return self.label
+
     def analyze(self):
         for plan in Plan.objects.get_related_to_event(self):
             plan.process_event(self)
 
 
+
 class PlanQuerySet(models.QuerySet):
 
     # this is for list of discount code for example
@@ -65,20 +69,29 @@ class Plan(BaseModel):
     def calculate_promotion(self, **kwargs):
         handler = self.handler
         self.base_amount = kwargs.get('base_amount', 0)
-        self.promotion_amount = handler.calculate(**kwargs)
-        return self.promotion_amount
+        return handler.calculate(**kwargs)
 
-    def reserve_promotion(self, promotion):
+    def reserve_promotion_amount(self, amount):
         updated = False
-        if self.balance >= promotion.promotion_amount:
-            updated = Plan.objects.filter(pk=self.pk, balance__gte=promotion.promotion_amount).update(
-                balance=F('balance') - promotion.promotion_amount
+        if amount and self.balance >= amount:
+            updated = Plan.objects.filter(pk=self.pk, balance__gte=amount).update(
+                balance=F('balance') - amount
             )
         return updated
 
     def process_event(self, event=None):
-        promotion, created = Promotion.objects.get_or_create()
-        promotion.promote()
+        referral_code = event.data.get('referral_code')
+        user_uuid = event.data.get('user_uuid')
+        promotion_amount = self.calculate_promotion()
+        if referral_code and promotion_amount and not self.promotions.filter(user_id=referral_code, data__user_uuid=user_uuid).exists():
+            with transaction.atomic():
+                if self.reserve_promotion_amount(promotion_amount):
+                    promotion, created = Promotion.objects.get_or_create()
+                    if created:
+                        raise Exception('Promotion already reserved')
+                else:
+                    raise Exception('Promotion already reserved')
+            promotion.promote()
 
 
 class PromotionQuerySet(models.QuerySet):
@@ -127,7 +140,7 @@ class Promotion(BaseModel):
 
     def promote(self, **kwargs):
         with transaction.atomic():
-            self.plan.reserve_promotion(self)
+            self.plan.reserve_promotion_amount(self)
             self.change_state(from_states=[Promotion.StateChoices.CREATED], to_state=Promotion.StateChoices.ASSIGNED,
                               same_ok=False, raise_exception=True)