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2121 varun.gupt 1 
'''
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Created on 08-Jun-2011
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@author: varungupta
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'''
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from shop2020.thriftpy.model.v1.user.ttypes import PromotionException
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from shop2020.model.v1.user.impl.PromotionRuleDataUtilities import get_coupon_usage_count, get_coupon_usage_count_by_user
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def execute(cart, coupon_code, args):
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    #Allow a user to use the coupon only once.
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    count_users_usage = get_coupon_usage_count_by_user(coupon_code, cart.userId)
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    if count_users_usage > 0:
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        raise PromotionException(111, 'You have already used this Coupon.')
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    #Allow only first 100 users to use the coupon
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    count_coupon_usage = get_coupon_usage_count(coupon_code)
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    if count_coupon_usage >= 100:
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        raise PromotionException(112, 'This promotion is over.')
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    if cart.lines:
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        total_selling_price = 0
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        for line in cart.lines:
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            #Disabling Coupon for Samsung Galaxy SII
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            if line.itemId == 1502:
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                raise PromotionException(115, 'This coupon is not applicable for Samsung Galaxy S II')
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            if line.itemId == 1491:
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                raise PromotionException(115, 'This coupon is not applicable for HTC Desire A8181')
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            if line.actualPrice:
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                total_selling_price +=  line.actualPrice * line.quantity
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        #MAX Discount 1500
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        if total_selling_price * 0.05 >= 1500:
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            discount_perc = 1500 / total_selling_price
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        elif total_selling_price >= 5000:
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            discount_perc = 0.05
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        else:
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            discount_perc = 0.03
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        cart.totalPrice = round(total_selling_price, 2)
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        cart.discountedPrice = round((1 - discount_perc) * total_selling_price, 2)
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        for line in cart.lines:
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            if line.actualPrice:
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                line.discountedPrice = round((1 - discount_perc) * line.actualPrice, 2)
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                print "The final price, after discount is " + str(cart.discountedPrice)
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    return cart