From 768453fae711eec9817a6afd1cc4ce9020d0248d Mon Sep 17 00:00:00 2001
From: Alexandr Abramov <alexandr.abramovvv@yandex.ru>
Date: Wed, 27 Sep 2023 20:40:45 +0300
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---
 products/models.py | 15 +++++++++++++++
 products/views.py  |  3 +++
 2 files changed, 18 insertions(+)

diff --git a/products/models.py b/products/models.py
index 9fa9a5c..686760f 100644
--- a/products/models.py
+++ b/products/models.py
@@ -1,5 +1,6 @@
 from django.contrib.auth import get_user_model
 from django.db import models
+from decimal import Decimal
 
 
 class Product(models.Model):
@@ -23,6 +24,20 @@ class Product(models.Model):
     def shop_name(self):
         return self.seller.shop_name
 
+    def calculate_final_price(self):
+        """
+        Расчет финальной стоимости товара
+        """
+
+        base_price = self.price
+        tax = base_price * Decimal('0.06')  #: Налог
+        bank_fee = base_price * Decimal('0.02')  #: Комиссия банку
+        author_commission = base_price * Decimal('0.02')  #: Комиссия за транзакцию продавца
+        marketplace_fee = base_price * Decimal('0.20')  #: Выручка маркетплейса
+
+        final_price = base_price + tax + bank_fee + author_commission + marketplace_fee
+        return final_price
+
     def __str__(self):
         return f'{self.product_title} {self.shop_name} {self.seller}'
 
diff --git a/products/views.py b/products/views.py
index de50c0e..cae9933 100644
--- a/products/views.py
+++ b/products/views.py
@@ -18,6 +18,9 @@ def perform_create(self, serializer):
 
         new_product = serializer.save(seller=self.request.user)
         new_product.seller = self.request.user
+
+        total_price = new_product.calculate_final_price()
+        new_product.price = total_price
         new_product.save()