class ConditionController(object):

    or Discount objects. '''

    def __init__(self):

    @staticmethod

    def for_condition(condition):

        CONTROLLERS = {

            rego.IncludedProductDiscount: ProductConditionController,

            rego.TimeOrStockLimitDiscount:

                TimeOrStockLimitDiscountController,

            rego.VoucherDiscount: VoucherConditionController,

        }

        try:

    }

    @classmethod

            cls, user, products=None, product_quantities=None):

        If `product_quantities` is supplied, the condition is only met if it

        will permit the sum of the product quantities for all of the products

        it covers. Otherwise, it will be met if at least one item can be

        accepted.

        a list is returned containing all of the products that are *not

        enabled*. '''

            quantities = {}

        # Get the conditions covered by the products themselves

        prods = (

            for product in products

        )

        # Get the conditions covered by their categories

        cats = (

            for category in set(product.category for product in products)

        )

        else:

            all_conditions = []

        messages = {}

                message = base % {"items": items, "remainder": remainder}

            for product in all_products:

                else:

                if not met and product not in messages:

                    messages[product] = message

        error_fields = [

            (product, messages[product])

        return error_fields

    def user_quantity_remaining(self, user):

        user can add to the current cart. This default implementation returns

        a big number if is_met() is true, otherwise 0.

        return 99999999 if self.is_met(user) else 0

    def is_met(self, user):

        False.

        Either this method, or user_quantity_remaining() must be overridden

class ProductConditionController(ConditionController):

    IncludedProductDiscount. '''

    def __init__(self, condition):

class TimeOrStockLimitConditionController(ConditionController):

    Discount.'''

    def __init__(self, ceiling):

        return self.ceiling.limit - count

        TimeOrStockLimitConditionController):

    def _items(self):

class VoucherConditionController(ConditionController):

    def __init__(self, condition):

        self.condition = condition