module RulesEngine
  module Rule
    class <%=rule_class%> < RulesEngine::Rule::Definition

      ##################################################################
      # class options
      self.options = 
        {
          :group => 'Twitter',
          :display_name => 'Twitter Filter Retweets',    
          :help_partial => '/re_rule_definitions/<%=rule_name%>/help',
          :new_partial => '/re_rule_definitions/<%=rule_name%>/new',
          :edit_partial => '/re_rule_definitions/<%=rule_name%>/edit'
        } 
  
      ##################################################################
      # set the rule data
      def data= data
        if data.nil?
          @title = nil
        else
          @title, ignore = ActiveSupport::JSON.decode(data)
        end  
      end
  
      ##################################################################
      # get the rule attributes
      def title
        @title
      end

      def summary
        "Filter out retweets"
      end
  
      def data
        [title].to_json
      end
  
      def expected_outcomes
          [
            {:outcome => RulesEngine::Rule::Outcome::NEXT}, 
            {:outcome => RulesEngine::Rule::Outcome::STOP_SUCCESS, :title => "Stop if retweet found"}
          ]
      end
  
      ##################################################################
      # set the rule attributes
      def attributes=(params)
        param_hash = params.symbolize_keys

        @title = param_hash[:<%=rule_name%>_title]
      end
  
      ##################################################################
      # validation and errors
      def valid?
        @errors = {}
        @errors[:<%=rule_name%>_title] = "Title required" if title.blank?    
        return @errors.empty?
      end

      ##################################################################
      # callbacks when the rule is added and removed from a workflow
      def before_create()
      end
  
      def before_update()
      end
      
      def before_destroy()
      end
  
      ##################################################################
      # execute the rule
      # if a match is found procees to the expected outcome
      # it gets the data parameter :tweet
      def process(process_id, data)
        tweet = data[:tweet] || data["tweet"]    
        if tweet.blank?
          return RulesEngine::Rule::Outcome.new(RulesEngine::Rule::Outcome::NEXT) 
        end
      
        if /\bRT\b/ =~ tweet
          RulesEngine::Process.auditor.audit(process_id, "Found retweet", RulesEngine::Process::AUDIT_INFO)
          return RulesEngine::Rule::Outcome.new(RulesEngine::Rule::Outcome::STOP_SUCCESS)
        end
        
        RulesEngine::Rule::Outcome.new(RulesEngine::Rule::Outcome::NEXT)
      end      
    end
  end
end