mirror of
https://github.com/LaCasemate/fab-manager.git
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86 lines
2.9 KiB
Ruby
86 lines
2.9 KiB
Ruby
# frozen_string_literal: true
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# This class provides helper methods to deal with coupons
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class CouponService
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##
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# Apply the provided coupon, if active, to the given price. Usability tests will be run depending on the
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# provided parameters.
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# If no coupon/coupon code or if the code does not match, return origin price without change
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#
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# @param total {Number} invoice total, before any coupon is applied
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# @param coupon {String|Coupon} Coupon's code OR Coupon object
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# @param user_id {Number} user's id against the coupon will be tested for usability
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# @return {Number}
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##
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def apply(total, coupon, user_id = nil)
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price = total
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coupon_object = nil
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if coupon.instance_of? Coupon
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coupon_object = coupon
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elsif coupon.instance_of? String
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coupon_object = Coupon.find_by(code: coupon)
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end
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unless coupon_object.nil?
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if coupon_object.status(user_id, total) == 'active'
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if coupon_object.type == 'percent_off'
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price -= (price * coupon_object.percent_off / 100.00).truncate
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elsif coupon_object.type == 'amount_off'
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# do not apply cash coupon unless it has a lower amount that the total price
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price -= coupon_object.amount_off if coupon_object.amount_off <= price
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end
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end
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end
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price
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end
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##
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# Find the coupon associated with the given code and check it is valid for the given user
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# @param code {String} the literal code of the coupon
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# @param user_id {Number} identifier of the user who is applying the coupon
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# @return {Coupon}
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##
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def validate(code, user_id)
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return nil unless code && user_id
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coupon = Coupon.find_by(code: code)
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raise InvalidCouponError if coupon.nil? || coupon.status(user_id) != 'active'
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coupon
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end
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##
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# Ventilate the discount of the provided coupon over the given amount proportionately to the invoice's total
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# @param total {Number} total amount of the invoice expressed in centimes
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# @param amount {Number} price of the invoice's sub-item expressed in centimes
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# @param coupon {Coupon} coupon applied to the invoice, amount_off expressed in centimes if applicable
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##
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def ventilate(total, amount, coupon)
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price = amount
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if !coupon.nil? && total != 0
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if coupon.type == 'percent_off'
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price = amount - (amount * coupon.percent_off / 100.00)
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elsif coupon.type == 'amount_off'
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ratio = (coupon.amount_off / 100.00) / total
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discount = (amount * ratio.abs) * 100
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price = amount - discount
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else
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raise InvalidCouponError
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end
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end
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price
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end
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##
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# Compute the total amount of the given invoice, without the applied coupon
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# Invoice.total stores the amount payed by the customer, coupon deducted
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# @param invoice {Invoice} invoice object, its total before discount will be computed
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# @return {Number} total in centimes
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##
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def invoice_total_no_coupon(invoice)
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invoice.invoice_items.map(&:amount).map(&:to_i).reduce(:+) or 0
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end
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end
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