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4186 varun.gupt 1 
'''
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Created on 06-Dec-2011
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@author: varungupta
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'''
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from shop2020.thriftpy.model.v1.user.ttypes import PromotionException, Discount
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from shop2020.clients.UserClient import UserClient
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from shop2020.model.v1.user.impl.PromotionRuleDataUtilities import get_coupon_usage_count_by_user
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def execute(cart, coupon_code, args):
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    user_client = UserClient().get_client()
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    user = user_client.getUserByCartId(cart.id)
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    email = user.email.lower().strip()
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    if email in args['emails']:
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        discount_value = args['discount']
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    else:
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        raise PromotionException(111, 'You are not allowed to use this coupon')
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    count_coupon_usage = get_coupon_usage_count_by_user(coupon_code, user.userId)
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    if count_coupon_usage >= args['usage_limit_for_user']:
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        raise PromotionException(112, 'Your usage limit for this coupon is exhausted.')
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    discounts = []
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    if cart.lines:
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        total_selling_price = 0
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        total_discounted_price = 0
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        for line in cart.lines:
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            line_total_price = line.actualPrice * line.quantity
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            line_total_discount = 0
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            while line_total_discount < line_total_price and discount_value > 0:
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                if line.actualPrice < discount_value:
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                    discountGiven = line.actualPrice
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                    quantity = min(line.quantity,int(discount_value/discountGiven))
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                else:
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                    discountGiven = discount_value
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                    quantity = 1
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                discount = Discount()
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                discount.cart_id = cart.id
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                discount.item_id = line.itemId
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                discount.discount = discountGiven
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                discount.quantity = quantity
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                discounts.append(discount)
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                discount_value = discount_value - discountGiven*quantity
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                line_total_discount += discountGiven*quantity
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            total_selling_price += line_total_price
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            total_discounted_price += line_total_price - line_total_discount
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        cart.totalPrice = total_selling_price
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        cart.discountedPrice = total_discounted_price
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    return cart, discounts
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def getDiscountOnItem(item):
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    return None