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# -*- coding: utf-8 -*- 

from django.contrib.auth.models import AnonymousUser 

from django.db import models, transaction 

from django.db.models.aggregates import Count 

from polymorphic.manager import PolymorphicManager 

 

 

#============================================================================== 

# Product 

#============================================================================== 

 

 

class ProductStatisticsManager(PolymorphicManager): 

    """ 

    A Manager for all the non-object manipulation needs, mostly statistics and 

    other "data-mining" toys. 

    """ 

 

    def top_selling_products(self, quantity): 

        """ 

        This method "mines" the previously passed orders, and gets a list of 

        products (of a size equal to the quantity parameter), ordered by how  

        many times they have been purchased. 

        """ 

        # Importing here is fugly, but it saves us from circular imports... 

        from shop.models.ordermodel import OrderItem 

        # Get an aggregate of product references and their respective counts 

        top_products_data = OrderItem.objects.values( 

                'product').annotate( 

                    product_count=Count('product') 

                ).order_by('product_count' 

            )[:quantity] 

 

        # The top_products_data result should be in the form: 

        # [{'product_reference': '<product_id>', 'product_count': <count>}, ...] 

 

        top_products_list = [] # The actual list of products 

        for values in top_products_data: 

            prod = values.get('product') 

            # We could eventually return the count easily here, if needed. 

            top_products_list.append(prod) 

 

        return top_products_list 

 

 

class ProductManager(PolymorphicManager): 

    """ 

    A more classic manager for Product filtering and manipulation. 

    """ 

    def active(self): 

        return self.filter(active=True) 

 

 

#============================================================================== 

# Order 

#============================================================================== 

 

class OrderManager(models.Manager): 

 

    def get_latest_for_user(self, user): 

        """ 

        Returns the last Order (from a time perspective) a given user has placed. 

        """ 

        if user and not isinstance(user, AnonymousUser): 

            return self.filter(user=user).order_by('-modified')[0] 

        else: 

            return None 

 

    @transaction.commit_on_success 

    def create_from_cart(self, cart): 

        """ 

        This creates a new Order object (and all the rest) from a passed Cart  

        object. 

         

        Specifically, it creates an Order with corresponding OrderItems and 

        eventually corresponding ExtraPriceFields 

         

        This will only actually commit the transaction once the function exits 

        to minimize useless database access. 

        """ 

        # must be imported here! 

        from shop.models.ordermodel import OrderItem, ExtraOrderPriceField, ExtraOrderItemPriceField 

        from shop.models.cartmodel import CartItem 

        # Let's create the Order itself: 

        o = self.model() 

        o.user = cart.user 

        o.status = self.model.PROCESSING # Processing 

 

        o.order_subtotal = cart.subtotal_price 

        o.order_total = cart.total_price 

 

        o.save() 

 

        # Let's serialize all the extra price arguments in DB 

        for label, value in cart.extra_price_fields: 

            eoi = ExtraOrderPriceField() 

            eoi.order = o 

            eoi.label = str(label) 

            eoi.value = value 

            eoi.save() 

 

        # There, now move on to the order items. 

        cart_items = CartItem.objects.filter(cart=cart) 

        for item in cart_items: 

            item.update() 

            i = OrderItem() 

            i.order = o 

            i.product_reference = item.product.id 

            i.product_name = item.product.name 

            i.product = item.product 

            i.unit_price = item.product.get_price() 

            i.quantity = item.quantity 

            i.line_total = item.line_total 

            i.line_subtotal = item.line_subtotal 

            i.save() 

            # For each order item, we save the extra_price_fields to DB  

118            for label, value in item.extra_price_fields: 

                eoi = ExtraOrderItemPriceField() 

                eoi.order_item = i 

                eoi.label = str(label) 

                eoi.value = value 

                eoi.save() 

        return o