module Slippers
  module AttributeToRenderNode

    def eval(object_to_render, template_group)
      [object_to_render].flatten.inject('') { |rendered, item| rendered + render(value_of(item), template_group) }
    end

    def value_of(item)
      return '' if to_s == ''
      return item.send(to_s) if item.respond_to?(to_s)
      return item[to_sym] if item.respond_to?('[]'.to_sym) && item[to_sym]
      ''
    end

    def render(object_to_render, template_group)
      return template_group.render(object_to_render) if template_group && template_group.has_registered?(object_to_render.class)
      object_to_render.to_s
    end
    
    def to_sym
      text_value.to_sym
    end
    
    def to_s
      text_value
    end

  end

  class TemplateNode < Treetop::Runtime::SyntaxNode

    def eval(object_to_render, template_group)
      apply_attribute_to_subtemplate(object_to_render, template_group)
    end

    def apply_attribute_to_subtemplate(item, template_group)
      return '' unless template_group
      subtemplate = template_group.find(template_path.to_s)
      return '' unless (subtemplate && subtemplate.respond_to?('render')) 
      subtemplate.render(item)
    end

    def to_s
      text_value
    end
  end
  
  class AnonymousTemplateNode < Treetop::Runtime::SyntaxNode
    
    def eval(object_to_render, template_group)
      apply_attribute_to_subtemplate(object_to_render, template_group)
    end
    
    def apply_attribute_to_subtemplate(item, template_group)
      SlippersParser.new.parse(anonymous_template_words.to_s).eval(item, template_group)
    end
    
    def to_s
      text_value
    end
  end

  class ApplyAttributeToTemplateNode < Treetop::Runtime::SyntaxNode

    def eval(object_to_render, template_group)
      [object_to_render].flatten.inject('') { |rendered, item| rendered + find_attribute_and_render(item, template_group) }
    end

    def find_attribute_and_render(item, template_group)
      object_to_render = attribute.value_of(item)
      [object_to_render].flatten.inject('') { |rendered, i| rendered + template.apply_attribute_to_subtemplate(i, template_group).to_s }
    end


    def to_s
      text_value
    end

  end

  class TemplatedExpressionNode < Treetop::Runtime::SyntaxNode

    def eval(object_to_render, template_group)
      foo.eval(object_to_render, template_group)
    end

  end

  class ExpressionNode < Treetop::Runtime::SyntaxNode

    def eval(object_to_render, template_group=nil)
      before.eval(object_to_render, template_group) + templated_expression.eval(object_to_render, template_group) + space.eval + after.eval(object_to_render, template_group)
    end

  end
end