module Parser
  
  def parser_context(page_content, attributes = {})
    Radius::Context.new do |c|
      c.define_tag 'content' do |tag|
        page_content
      end
      c.define_tag 'snippet' do |tag|
        snippet = Snippet.first(:conditions => {:name => tag.attr['name']})
        if snippet
          snippet.content
        else
          t('nothing')
        end
      end
      c.define_tag 'language_bar' do
        @site.in_use_locales.map{ |locale|
          lang = I18nVariable.first(:conditions => {:key => locale})[locale]
          if I18n.locale.to_s.eql?(locale)
            lang
          else
            "<a href='?locale=#{locale}'>#{lang}</a>"
          end
        }.join(' | ')
      end
      c.define_tag 'locale' do |tag|
        case attributes[:locale]
          when 'create'
            var = I18nVariable.new(:key => (tag.attr['name'] rescue nil), :document_class => 'Text')
            @site.valid_locales.each do |locale|
              var[locale] = tag.attr[locale] rescue nil
            end
            var.save!
            res = ''
            res << "<r:locale id='#{var.id}' " 
            res << "name='#{var.key}' " if var.key
            @site.valid_locales.each do |locale|
              res << "#{locale}='#{var[locale]}' "
            end
            res << '/>'
          when 'show'
            var = I18nVariable.find(tag.attr['id'])
            res = ''
            res << "<r:locale " 
            res << "name='#{var.key}' " if var.key
            @site.valid_locales.each do |locale|
              res << "#{locale}='#{var[locale]}' "
            end
            res << '/>'
          when 'destroy'
            var = I18nVariable.find(tag.attr['id'])
            var.destroy
          else
            tag.attr[I18n.locale.to_s] rescue nil
        end
      end
    end
  end
  
  def parse_content(page_content, attributes = {})
    context = parser_context(page_content, attributes)
    parser = Radius::Parser.new(context, :tag_prefix => 'r')
    parser.parse(page_content)
  end
  
  def parse_page(page)
    layout_content = (page.layout)? page.layout.content : "<r:content />"  
    context = parser_context(page.content)
    parser = Radius::Parser.new(context, :tag_prefix => 'r')
    parser.parse(parser.parse(layout_content))
  end

end