module Cucumber
  module WireSupport
    # Represents the packet of data sent over the wire as JSON data, containing
    # a message and a hash of arguments
    class WirePacket
      class << self
        def parse(raw)
          attributes = JSON.parse(raw.strip)
          message = attributes[0]
          params  = attributes[1]
          new(message, params)
        end
      end
      
      attr_reader :message, :params
      
      def initialize(message, params)
        @message, @params = message, params
      end
      
      def to_json
        [@message, @params].to_json
      end
      
      def raise_if_bad
        raise WireException.new(@params) if @message == 'fail' || @message == 'step_failed'
      end
      
      def handle_with(handler)
        handler.send("handle_#{@message}", @params)
      end
    end
  end
end