require 'nokogiri'

# = XmlMini Nokogiri implementation
module ActiveSupport
  module XmlMini_Nokogiri #:nodoc:
    extend self

    # Parse an XML Document string or IO into a simple hash using libxml / nokogiri.
    # data::
    #   XML Document string or IO to parse
    def parse(data)
      if !data.respond_to?(:read)
        data = StringIO.new(data || '')
      end
      
      char = data.getc
      if char.nil?
        {}
      else
        data.ungetc(char)
        doc = Nokogiri::XML(data) { |cfg| cfg.noblanks }
        raise doc.errors.first if doc.errors.length > 0
        doc.to_hash
      end
    end

    module Conversions #:nodoc:
      module Document #:nodoc:
        def to_hash
          root.to_hash
        end
      end

      module Node #:nodoc:
        CONTENT_ROOT = '__content__'

        # Convert XML document to hash
        #
        # hash::
        #   Hash to merge the converted element into.
        def to_hash(hash = {})
          attributes = attributes_as_hash
          if hash[name]
            hash[name] = [hash[name]].flatten
            hash[name] << attributes
          else
            hash[name] ||= attributes
          end

          children.each { |child|
            next if child.blank? && 'file' != self['type']

            if child.text? || child.cdata?
              (attributes[CONTENT_ROOT] ||= '') << child.content
              next
            end

            child.to_hash attributes
          }

          hash
        end

        def attributes_as_hash
          Hash[*(attribute_nodes.map { |node|
            [node.node_name, node.value]
          }.flatten)]
        end
      end
    end

    Nokogiri::XML::Document.send(:include, Conversions::Document)
    Nokogiri::XML::Node.send(:include, Conversions::Node)
  end
end