Module: Voucherify::Utils

Defined in:
lib/voucherify/utils.rb

Class Method Summary collapse

Class Method Details

.calculate_discount(base_price, voucher, unit_price = nil) ⇒ Object 



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# File 'lib/voucherify/utils.rb', line 63

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

.calculate_price(base_price, voucher, unit_price = nil) ⇒ Object 



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# File 'lib/voucherify/utils.rb', line 25

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

.round_money(value) ⇒ Object 



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# File 'lib/voucherify/utils.rb', line 3

def self.round_money(value)
  value.round(2)
end

.validate_amount_discount(discount) ⇒ Object 



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# File 'lib/voucherify/utils.rb', line 13

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

.validate_percent_discount(discount) ⇒ Object 



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# File 'lib/voucherify/utils.rb', line 7

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

.validate_unit_discount(discount) ⇒ Object 



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# File 'lib/voucherify/utils.rb', line 19

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