Module: Magelex::TaxGuess
- Defined in:
- lib/magelex/tax_guess.rb
Class Method Summary collapse
-
.guess(total, tax_amount) ⇒ Object
Guesses the tax category.
Class Method Details
.guess(total, tax_amount) ⇒ Object
Guesses the tax category. Question is: how many percent of total is tax_amount.
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# File 'lib/magelex/tax_guess.rb', line 5 def self.guess(total, tax_amount) if total == 0 && tax_amount == 0 return :empty_item end if total == 0 raise "TaxGuess: Cannot guess tax of "\ "#{total}/#{tax_amount} (#{total - total/tax_amount})" end # net: netto, gro: gross/brutto # gro_price = net_price + taxes ## (1: net_price = gro_price - taxes) # gro_price = net_price + net_price * tax_perce # tax_perce = (gro_price - net_price) / net_price # tax_perce = gro_price / net_price - 1 ## (see 1) percentage = total.to_f / (total - tax_amount) - 1 case percentage when -0.01..0.01 :tax0 when 0.06..0.09 :tax7 when 0.16..0.20 :tax19 else raise "TaxGuess: Cannot guess tax of "\ "#{total}/#{tax_amount} (#{total - total/tax_amount}) - #{tax_amount/total if total != 0}" end end |