# Tacking categories look like:
#
# <TrackingCategory>
#   <Name>Region</Name>
#   <Status>ACTIVE</Status>
#   <TrackingCategoryID>e4a95e64-ebaa-401e-81cf-b625c7532d01</TrackingCategoryID>
#   <Options>
#     <Option>
#       <TrackingOptionID>ea7f7b6a-0d22-4d5c-9317-54542a10215e</TrackingOptionID>
#       <Name>North</Name>
#     </Option>
#     <Option>
#       <TrackingOptionID>8e8b8d7b-fa75-4b24-b429-8cbc1a21af23</TrackingOptionID>
#       <Name>South</Name>
#     </Option>
#   </Options>
# </TrackingCategory>
#
module XeroGateway
  class TrackingCategory
    attr_accessor :tracking_category_id, :name, :options
    
    def initialize(params = {})
      @options = []
      params.each do |k,v|
        self.send("#{k}=", v)
      end
    end
    
    def option
       options[0] if options.size == 1
    end
        
    def to_xml(b = Builder::XmlMarkup.new)
      b.TrackingCategory {
        b.TrackingCategoryID tracking_category_id unless tracking_category_id.nil?
        b.Name self.name
        b.Options {
          if self.options.is_a?(Array)
            self.options.each do |option|
              b.Option {
                b.Name option
              }
            end
          else
            b.Option {
              b.Name self.options.to_s
            }            
          end
        }
      }
    end
    
    # When a tracking category is serialized as part of an invoice it may only have a single
    # option, and the Options tag is omitted
    def to_xml_for_invoice_messages(b = Builder::XmlMarkup.new)
      b.TrackingCategory {
        b.TrackingCategoryID self.tracking_category_id
        b.Name self.name
        b.Option self.options.is_a?(Array) ? self.options.first : self.options.to_s 
      }      
    end
    
    def self.from_xml(tracking_category_element)
      tracking_category = TrackingCategory.new
      tracking_category_element.children.each do |element|
        case(element.name)
          when "TrackingCategoryID" then tracking_category.tracking_category_id = element.text
          when "Name" then tracking_category.name = element.text
          when "Options" then
            element.children.each do |option_child|
              tracking_category.options << option_child.children.detect {|c| c.name == "Name"}.text
            end
          when "Option" then tracking_category.options << element.text
        end
      end
      tracking_category              
    end  
    
    def ==(other)
      [:tracking_category_id, :name, :options].each do |field|
        return false if send(field) != other.send(field)
      end
      return true
    end      
  end
end