first commit

cart/cart.py

@@ -0,0 +1,127 @@
+from decimal import Decimal
+from django.conf import settings
+from product.models import Product
+from .models import Cart as CartModel, CartItem
+
+class Cart(object):
+    def __init__(self, request):
+        """
+        Initialize the cart.
+        """
+        self.session = request.session
+        self.user = request.user
+        
+        # Session cart initialization
+        cart = self.session.get(settings.CART_SESSION_ID)
+        if not cart:
+            cart = self.session[settings.CART_SESSION_ID] = {}
+        self.cart = cart
+
+    def add(self, product, quantity=1, override_quantity=False):
+        """
+        Add a product to the cart or update its quantity.
+        """
+        if self.user.is_authenticated:
+            self._add_db(product, quantity, override_quantity)
+        else:
+            self._add_session(product, quantity, override_quantity)
+
+    def _add_session(self, product, quantity, override_quantity):
+        product_id = str(product.id)
+        if product_id not in self.cart:
+            self.cart[product_id] = {'quantity': 0, 'price': str(product.price)}
+        
+        if override_quantity:
+            self.cart[product_id]['quantity'] = quantity
+        else:
+            self.cart[product_id]['quantity'] += quantity
+            
+        if self.cart[product_id]['quantity'] <= 0:
+            self.remove(product)
+        else:
+            self.save()
+
+    def _add_db(self, product, quantity, override_quantity):
+        cart, created = CartModel.objects.get_or_create(user=self.user)
+        cart_item, item_created = CartItem.objects.get_or_create(cart=cart, product=product)
+        
+        if override_quantity:
+            cart_item.quantity = quantity
+        else:
+            if not item_created:
+                cart_item.quantity += quantity
+            else:
+                cart_item.quantity = quantity # Yeni oluşturulduysa zaten default 1 değil, gelen quantity olmalı
+        
+        if cart_item.quantity <= 0:
+            cart_item.delete()
+        else:
+            cart_item.save()
+
+    def save(self):
+        # mark the session as "modified" to make sure it gets saved
+        self.session.modified = True
+
+    def remove(self, product):
+        """
+        Remove a product from the cart.
+        """
+        if self.user.is_authenticated:
+            CartItem.objects.filter(cart__user=self.user, product=product).delete()
+        else:
+            product_id = str(product.id)
+            if product_id in self.cart:
+                del self.cart[product_id]
+                self.save()
+
+    def __iter__(self):
+        """
+        Iterate over the items in the cart and get the products
+        from the database.
+        """
+        if self.user.is_authenticated:
+            # DB'den oku
+            cart, created = CartModel.objects.get_or_create(user=self.user)
+            for item in cart.items.select_related('product').all():
+                yield {
+                    'product': item.product,
+                    'quantity': item.quantity,
+                    'price': Decimal(item.product.price),
+                    'total_price': Decimal(item.product.price) * item.quantity
+                }
+        else:
+            # Session'dan oku
+            product_ids = self.cart.keys()
+            products = Product.objects.filter(id__in=product_ids)
+            cart = self.cart.copy()
+            for product in products:
+                cart[str(product.id)]['product'] = product
+            for item in cart.values():
+                item['price'] = Decimal(item['price'])
+                item['total_price'] = item['price'] * item['quantity']
+                yield item
+
+    def __len__(self):
+        """
+        Count all items in the cart.
+        """
+        if self.user.is_authenticated:
+            cart, created = CartModel.objects.get_or_create(user=self.user)
+            return sum(item.quantity for item in cart.items.all())
+        else:
+            return sum(item['quantity'] for item in self.cart.values())
+
+    def get_total_price(self):
+        if self.user.is_authenticated:
+            cart, created = CartModel.objects.get_or_create(user=self.user)
+            return sum(item.total_price for item in cart.items.all())
+        else:
+            return sum(Decimal(item['price']) * item['quantity'] for item in self.cart.values())
+
+    def clear(self):
+        if self.user.is_authenticated:
+            cart, created = CartModel.objects.get_or_create(user=self.user)
+            cart.items.all().delete()
+        else:
+            del self.session[settings.CART_SESSION_ID]
+            self.save()