lib/voucherify/utils.rb
module Voucherify
module Utils
def self.round_money(value)
value.round(2)
end
def self.validate_percent_discount(discount)
if !(discount.is_a? Numeric) || !discount.between?(0, 100)
raise 'Invalid voucher, percent discount should be between 0-100.'
end
end
def self.validate_amount_discount(discount)
if !(discount.is_a? Numeric) || discount < 0
raise 'Invalid voucher, amount discount must be bigger than zero.'
end
end
def self.validate_unit_discount(discount)
if !(discount.is_a? Numeric) || discount < 0
raise 'Invalid voucher, unit discount must be bigger than zero.'
end
end
def self.calculate_price(base_price, voucher, unit_price = nil)
e = 100.0
if voucher[:gift]
discount = [voucher[:gift][:balance] / e, base_price].min
return round_money(base_price - discount)
end
if !voucher[:discount]
raise 'Unsupported voucher type.'
end
if voucher[:discount][:type] === 'PERCENT'
discount = voucher[:discount][:percent_off]
validate_percent_discount(discount);
price_discount = base_price * (discount / 100.0)
return round_money(base_price - price_discount)
elsif voucher[:discount][:type] === 'AMOUNT'
discount = voucher[:discount][:amount_off] / e
validate_amount_discount(discount)
new_price = base_price - discount
return round_money(new_price > 0 ? (new_price) : 0)
elsif voucher[:discount][:type] === 'UNIT'
if !unit_price
raise 'Missing unit_price argument.'
end
discount = voucher[:discount][:unit_off]
validate_unit_discount(discount)
new_price = base_price - unit_price * discount
return round_money(new_price > 0 ? (new_price) : 0)
else
raise 'Unsupported discount type'
end
end
def self.calculate_discount(base_price, voucher, unit_price = nil)
e = 100.0
if voucher[:gift]
discount = [voucher[:gift][:balance] / e, base_price].min
return round_money(discount)
end
if !voucher[:discount]
raise 'Unsupported voucher type.'
end
if voucher[:discount][:type] === 'PERCENT'
discount = voucher[:discount][:percent_off]
validate_percent_discount(discount);
price_discount = base_price * (discount / 100.0)
return round_money(price_discount)
elsif voucher[:discount][:type] === 'AMOUNT'
discount = voucher[:discount][:amount_off] / e
validate_amount_discount(discount)
new_price = base_price - discount
return round_money(new_price > 0 ? (discount) : (base_price))
elsif voucher[:discount][:type] === 'UNIT'
if !unit_price
raise 'Missing unit_price argument.'
end
discount = voucher[:discount][:unit_off]
validate_unit_discount(discount)
price_discount = unit_price * discount
return round_money(price_discount > base_price ? (base_price) : (price_discount))
else
raise 'Unsupported discount type'
end
end
end
end