module Quickbooks
  module Model
    class PurchaseLineItem < BaseModel

      #== Constants
      ITEM_BASED_EXPENSE_LINE_DETAIL = 'ItemBasedExpenseLineDetail'
      ACCOUNT_BASED_EXPENSE_LINE_DETAIL = 'AccountBasedExpenseLineDetail'
      GROUP_LINE_DETAIL = 'GroupLineDetail'

      xml_accessor :id, :from => 'Id'
      xml_accessor :line_num, :from => 'LineNum', :as => Integer
      xml_accessor :description, :from => 'Description'
      xml_accessor :amount, :from => 'Amount', :as => BigDecimal, :to_xml => Proc.new { |val| val.to_f }
      xml_accessor :detail_type, :from => 'DetailType'
      xml_accessor :received, :from => 'Received', :as => BigDecimal, :to_xml => to_xml_big_decimal

      #== Various detail types
      xml_accessor :account_based_expense_line_detail, :from => ACCOUNT_BASED_EXPENSE_LINE_DETAIL, :as => AccountBasedExpenseLineDetail
      xml_accessor :item_based_expense_line_detail, :from => ITEM_BASED_EXPENSE_LINE_DETAIL, :as => ItemBasedExpenseLineDetail
      xml_accessor :group_line_detail, :from => GROUP_LINE_DETAIL, :as => GroupLineDetail

      def account_based?
        detail_type.to_s == ACCOUNT_BASED_EXPENSE_LINE_DETAIL
      end

      def item_based?
        detail_type.to_s == ITEM_BASED_EXPENSE_LINE_DETAIL
      end

      def account_based_expense!
        self.detail_type = ACCOUNT_BASED_EXPENSE_LINE_DETAIL
        self.account_based_expense_line_detail = AccountBasedExpenseLineDetail.new

        yield self.account_based_expense_line_detail if block_given?
      end

      def item_based_expense!
        self.detail_type = ITEM_BASED_EXPENSE_LINE_DETAIL
        self.item_based_expense_line_detail = ItemBasedExpenseLineDetail.new

        yield self.item_based_expense_line_detail if block_given?
      end
    end
  end
end