Add the invoice template

uncloud_pay/migrations/0025_auto_20210803_2118.py

@@ -0,0 +1,24 @@
+# Generated by Django 3.2.4 on 2021-08-03 21:18
+
+from django.db import migrations, models
+import django.db.models.deletion
+
+
+class Migration(migrations.Migration):
+
+    dependencies = [
+        ('uncloud_pay', '0024_auto_20210730_1441'),
+    ]
+
+    operations = [
+        migrations.AlterField(
+            model_name='billrecord',
+            name='bill',
+            field=models.ForeignKey(on_delete=django.db.models.deletion.CASCADE, related_name='bill_records', to='uncloud_pay.bill'),
+        ),
+        migrations.AlterField(
+            model_name='payment',
+            name='type',
+            field=models.CharField(choices=[('withdraw', 'Withdraw Money'), ('deposit', 'Deposit Money')], default='deposit', max_length=256),
+        ),
+    ]

uncloud_pay/migrations/0026_remove_order_description.py

@@ -0,0 +1,17 @@
+# Generated by Django 3.2.4 on 2021-08-03 21:40
+
+from django.db import migrations
+
+
+class Migration(migrations.Migration):
+
+    dependencies = [
+        ('uncloud_pay', '0025_auto_20210803_2118'),
+    ]
+
+    operations = [
+        migrations.RemoveField(
+            model_name='order',
+            name='description',
+        ),
+    ]

uncloud_pay/models.py

@@ -649,8 +649,6 @@ class Order(models.Model):
 
     customer = models.ForeignKey(StripeCustomer, on_delete=models.CASCADE, null=True)
 
-    description = models.TextField()
-
     product = models.ForeignKey(Product, blank=False, null=False, on_delete=models.CASCADE)
     config = models.JSONField()
 
@@ -806,6 +804,19 @@ class Order(models.Model):
     @property
     def is_one_time(self):
         return not self.is_recurring
+    
+    @property
+    def description(self):
+        desc = self.product.description + "( "
+        config = json.loads(self.config)
+        if config and config["cores"]:
+            desc = f"{desc} {config['cores']} Cores,"
+        if config and config["memory"]:
+            desc = f"{desc} {config['memory']} RAM,"
+        if config and config["storage"]:
+            desc = f"{desc} {config['storage']} GB SSD,"
+        desc += " )"
+        return desc
 
     def replace_with(self, new_order):
         new_order.replaces = self
@@ -1011,6 +1022,11 @@ class Bill(models.Model):
         bill_records = BillRecord.objects.filter(bill=self)
         return sum([ br.sum for br in bill_records ])
 
+    @property
+    def subtotal(self):
+        bill_records = BillRecord.objects.filter(bill=self)
+        return sum([ br.subtotal for br in bill_records ])
+
     @property
     def vat_rate(self):
         return VATRate.get_vat_rate(self.billing_address, when=self.ending_date)
@@ -1114,7 +1130,7 @@ class BillRecord(models.Model):
     Entry of a bill, dynamically generated from an order.
     """
 
-    bill = models.ForeignKey(Bill, on_delete=models.CASCADE)
+    bill = models.ForeignKey(Bill, on_delete=models.CASCADE, related_name='bill_records')
     order = models.ForeignKey(Order, on_delete=models.CASCADE)
 
     creation_date = models.DateTimeField(auto_now_add=True)
@@ -1142,12 +1158,30 @@ class BillRecord(models.Model):
         else:
             return self.order.one_time_price
 
+    @property
+    def description(self):
+        if self.order:
+            return self.order.description
+        return ''
+
     @property
     def price(self):
         if self.is_recurring_record:
             return self.order.recurring_price
         else:
             return self.order.one_time_price
+    
+    @property
+    def subtotal(self):
+        billing_address_ins = self.order.billing_address
+        vat_rate = VATRate.get_vat_rate(billing_address_ins)
+        vat_validation_status = "verified" if billing_address_ins.vat_number_validated_on and billing_address_ins.vat_number_verified else False
+        config = json.loads(self.order.config)
+        pricing = uncloud_pay.utils.get_order_total_with_vat(
+            config["cores"], config["memory"], config["storage"], self.order.pricing_plan.name,
+            vat_rate=vat_rate * 100, vat_validation_status = vat_validation_status
+        )
+        return pricing['subtotal_after_discount']
 
     def __str__(self):
         if self.is_recurring_record:

uncloud_pay/utils.py

@@ -124,10 +124,11 @@ def apply_vat_discount(subtotal, pricing_plan, vat_rate=False, vat_validation_st
         'amount_with_vat': round(float(discount_amount_with_vat), 2)
     }
     subtotal_after_discount = subtotal - discount["amount"]
+    vat_amount = round(vat_percent * 0.01 * subtotal_after_discount, 2)
     price_after_discount_with_vat = round((subtotal - discount['amount']) * (1 + vat_percent * 0.01), 2)
 
     return (subtotal, round(float(subtotal_after_discount), 2), price_after_discount_with_vat, 
-            round(float(vat), 2), vat_percent, discount)
+            round(float(vat), 2), vat_percent, vat_amount, discount)
 
 
 def get_order_total_with_vat(cores, memory, storage,
@@ -149,13 +150,14 @@ def get_order_total_with_vat(cores, memory, storage,
         (decimal.Decimal(memory) * pricing.ram_unit_price) +
         (decimal.Decimal(storage) * (pricing.storage_unit_price)) 
     )
-    subtotal, subtotal_after_discount, price_after_discount_with_vat, vat, vat_percent, discount = \
+    subtotal, subtotal_after_discount, price_after_discount_with_vat, vat, vat_percent, vat_amount, discount = \
                                     apply_vat_discount(subtotal, pricing, vat_rate, vat_validation_status)
     return {
             "name": pricing.name,
             "subtotal": subtotal, 
             "discount": discount, 
             "vat": vat, "vat_percent": vat_percent,
+            'vat_amount': vat_amount,
             "vat_validation_status": vat_validation_status,
             "subtotal_after_discount": subtotal_after_discount,
             "total": price_after_discount_with_vat