module Useless
  module Doc
    class Proxy

      # +Doc::Proxy::HTML+ is the base application for +Useless::Doc::Proxy+.
      # It expects a +Doc::UI+ instance to be set as 'useless.doc.ui', and a
      # +Doc::Core+ entity to be set as 'useless.doc.subject', and then simply
      # passes the latter to the former's +#html+ method.
      #
      module HTML
        def self.call(env)
          if html = env['useless.doc.ui'].html(env['useless.doc.subject'])
            if env['useless.doc.logger']
              env['useless.doc.logger'].info "rendered subject HTML for #{env['useless.doc.url']}"
              env['useless.doc.logger'].debug "rendered HTML: #{html}"
            end

            [200, {'Content-Type' => 'text/html'}, [html]]
          else
            [404, {'Content-Type' => 'text/plain'}, ['Could not render documentation.']]
          end
        end
      end
    end
  end
end