require_relative "html_converter"

class SourceView < ElementView

  def initialize interpreter
    @interpreter = interpreter
    @interpreter.register_event(:instruction_changed,  self)
  end

  def draw
    @text = div(".text")
    @ticker = div(".ticker")
    @element = div(".source_view") << div("h4.source" , "Class.Method") << @ticker << @text
    @element
  end

  def instruction_changed
    i = @interpreter.instruction
    return "" unless i
    update_method
    case i.source
    when AST::Node
      id = i.source.object_id
      if e = @text.at_css("#i#{id}")
        if (old = @text.at_css(".fade_in"))
          old.remove_class("fade_in")
        end
        e.add_class "fade_in"
      end
    when String
      @ticker.text = i.source
    else
      raise i.source.class.name
    end
  end

  def update_method
    i = @interpreter.instruction
    case i
    when Register::Label
      if i.name.include?(".")
        cl_name , method_name = *i.name.split(".")
        clazz = Register.machine.space.get_class_by_name cl_name
        method = clazz.get_instance_method( method_name)
      else
        return
      end
      @element.at_css(".source").text = i.name
    when Register::FunctionReturn
      object = @interpreter.object_for( i.register )
      link = object.internal_object_get( i.index )
      method = link.method
      @element.at_css(".source").text = method.name
    else
      return
    end
    @text.inner_html = HtmlConverter.new.process( method.source )
  end

end