module DataMapper
  module CubaPlugin
   
    # matcher
    def no_path
      Proc.new { env[ 'PATH_INFO' ].empty? }
    end

    # matcher
    def head
      req.head?
    end

    def option
      req.options?
    end

    # convenient method for status only responses
    def no_body( status )
      res.status = ::Rack::Utils.status_code( status )
      res.write ::Rack::Utils::HTTP_STATUS_CODES[ res.status ]
      res['Content-Type' ] = 'text/plain'
    end

    # params
    def to_float( name, default = nil )
     v = req[ name ]
     if v
       v.to_f
     else
       default
     end
    end

    def to_int( name, default = nil )
      v = req[ name ]
      if v
        v.to_i
      else
        default
      end
    end

    def to_boolean( name, default = nil )
      v = req[ name ]
      if v
        v == 'true'
      else
        default
      end
    end

    def offset_n_limit( method, set )
      count = set.count
      offset = to_int( 'offset' ).to_i
      limit = ( to_int( 'count' ) || count ) - 1 + offset
      { method => set[ offset..limit ], :offset => offset, :total_count => count }
    end
    
    def last_modified( last )
      if last
        res[ 'Last-Modified' ] = rfc2616( last )
        res[ 'Cache-Control' ] = "private, max-age=0, must-revalidate"
      end
    end

    def modified_since
      @modified_since ||=
        if date = env[ 'HTTP_IF_MODIFIED_SINCE' ]
          DateTime.parse( date )
        end
    end
  end
end