87 lines
2.8 KiB
Python
87 lines
2.8 KiB
Python
import itertools
|
|
|
|
from django.db.models import Q
|
|
from registrasion import models as rego
|
|
|
|
from conditions import ConditionController
|
|
|
|
|
|
class ProductController(object):
|
|
|
|
def __init__(self, product):
|
|
self.product = product
|
|
|
|
@classmethod
|
|
def available_products(cls, user, category=None, products=None):
|
|
''' Returns a list of all of the products that are available per
|
|
enabling conditions from the given categories.
|
|
TODO: refactor so that all conditions are tested here and
|
|
can_add_with_enabling_conditions calls this method. '''
|
|
if category is None and products is None:
|
|
raise ValueError("You must provide products or a category")
|
|
|
|
if category is not None:
|
|
all_products = rego.Product.objects.filter(category=category)
|
|
else:
|
|
all_products = []
|
|
|
|
if products is not None:
|
|
all_products = itertools.chain(all_products, products)
|
|
|
|
out = [
|
|
product
|
|
for product in all_products
|
|
if cls(product).can_add_with_enabling_conditions(user, 0)
|
|
]
|
|
out.sort(key=lambda product: product.order)
|
|
return out
|
|
|
|
def user_can_add_within_limit(self, user, quantity):
|
|
''' Return true if the user is able to add _quantity_ to their count of
|
|
this Product without exceeding _limit_per_user_.'''
|
|
|
|
carts = rego.Cart.objects.filter(user=user)
|
|
items = rego.ProductItem.objects.filter(
|
|
product=self.product,
|
|
cart=carts)
|
|
|
|
count = 0
|
|
for item in items:
|
|
count += item.quantity
|
|
|
|
if quantity + count > self.product.limit_per_user:
|
|
return False
|
|
else:
|
|
return True
|
|
|
|
def can_add_with_enabling_conditions(self, user, quantity):
|
|
''' Returns true if the user is able to add _quantity_ to their count
|
|
of this Product without exceeding the ceilings the product is attached
|
|
to. '''
|
|
|
|
conditions = rego.EnablingConditionBase.objects.filter(
|
|
Q(products=self.product) | Q(categories=self.product.category)
|
|
).select_subclasses()
|
|
|
|
mandatory_violated = False
|
|
non_mandatory_met = False
|
|
|
|
for condition in conditions:
|
|
cond = ConditionController.for_condition(condition)
|
|
met = cond.is_met(user, quantity)
|
|
|
|
if condition.mandatory and not met:
|
|
mandatory_violated = True
|
|
break
|
|
if met:
|
|
non_mandatory_met = True
|
|
|
|
if mandatory_violated:
|
|
# All mandatory conditions must be met
|
|
return False
|
|
|
|
if len(conditions) > 0 and not non_mandatory_met:
|
|
# If there's any non-mandatory conditions, one must be met
|
|
return False
|
|
|
|
return True
|