lib/taxedo/region.rb in taxedo-0.0.4 vs lib/taxedo/region.rb in taxedo-0.0.5

@@ -1,26 +1,37 @@
+require 'yaml'
 require 'time'
 
 class Taxedo::Region
   def initialize(id)
     @id = id
     @data = YAML.load_file(Taxedo.base_data_path + "regions.yml")['taxedo']['regions'][@id]
   end
 
   def calculate(amount, options={})
-    options = { :on => Time.now, :rule => 'standard' }.merge(options)
+    options = { :on => Time.now, :rule => 'standard', :equations => 'compiled'}.merge(options)
 
     receipt = Taxedo::Receipt.new(@id, amount)
     receipt.currency = @data['currency']
+    receipt.equation_type = equation_type_from_date(options[:on]).nil? ? options[:equations] : equation_type_from_date(options[:on])
 
     taxes(options[:rule], options[:on]).each do |tax|
       receipt.add_tax tax[0], tax[1]
     end
 
     return receipt
   end
 
   private
+
+  def equation_type_from_date(start_at)
+    selection = Time.at(0)
+    @data['equation_types'].each do |equation_start_at, equation|
+      equation_start_at = Time.parse(equation_start_at.to_s)
+      selection = equation_start_at if equation_start_at <= start_at and equation_start_at > selection
+    end
+    @data['equation_types'][selection.strftime('%Y%m%d').to_i]
+  end
 
   def tax_from_start_date(tax_id, start_at)
     selection = Time.at(0)
 
     @data['taxes'][tax_id].each do |tax_start_at, tax_rate|