require File.dirname(__FILE__) + "/depth_first_search_iterator"
require File.dirname(__FILE__) + "/xml_visitor"

module Glimmer
  module XML
    class Node
      include Parent, Glimmer

      attr_accessor :children, :name, :contents, :attributes, :is_name_space, :is_attribute, :name_space, :parent

      def initialize(parent, name, attributes, &contents)
        @is_name_space = false
        @children = []
        @parent = parent
        if (parent and parent.is_name_space)
          @name_space = parent
          @parent = @name_space.parent
        end
        @parent.children << self if @parent
        @name = name
        @contents = contents
        @attributes = attributes
        if @attributes
          @attributes.each_key do |attribute|
            if attribute.is_a?(Node)
              attribute.is_attribute = true
              attribute.parent.children.delete(attribute) if attribute.parent
              attribute.parent = nil #attributes do not usually have parents
            end
          end
          Glimmer.logger.debug(attributes)
        end
      end

      def method_missing(symbol, *args, &block)
        @is_name_space = true
        parent.children.delete(self) if parent
        Glimmer.add_contents(self) {@tag = super}
        @tag
      end

      def to_xml
        xml_visitor = XmlVisitor.new
        DepthFirstSearchIterator.new(self, xml_visitor).iterate
        xml_visitor.document
      end

      def process_block(block)
        return_value = block.call(@widget) #TODO fix (remove @widget reference)
        if return_value.is_a?(String) and !@children.include?(return_value)
          text = return_value
          first_match = text.match(/[#][^{]+[{][^}]+[}]/)
          match = first_match
          while (match)
            Glimmer.module_eval(text_command(match.pre_match))
            tag_text = match.to_s
            Glimmer.module_eval(rubyize(tag_text))
            text = tag_text
            post_match = match.post_match
            match = text.match(/[#]\w+[{]\w+[}]/)
          end
          Glimmer.module_eval(text_command(post_match)) if post_match
          @children << return_value unless first_match
        end
      end

      def text_command(text)
        "text \"#{text}\""
      end

      def rubyize(text)
        text = text.gsub(/[}]/, '"}')
        text = text.gsub(/[{]/, '{"')
          text = text.gsub(/[#]/, '')
        end

        #override Object default id method and route it to Glimmer engine
        def id
          method_missing(:id)
        end

      end
  end
end