module Castronaut
  module Presenters

    class Login
      attr_reader :controller, :your_mission
      attr_accessor :messages

      delegate :params, :request, :to => :controller
      delegate :cookies, :env, :to => :request

      def initialize(controller)
        @controller = controller
        @messages = []
        @your_mission = nil
      end

      def service
        params['service']
      end

      def renewal
        params['renew']
      end

      def gateway?
        return true if params['gateway'] == 'true'
        return true if params['gateway'] == '1'
        false
      end

      def ticket_generating_ticket_cookie
        cookies['tgt']
      end

      def redirection_loop?
        params.has_key?('redirection_loop_intercepted')
      end
      
      def client_host
        env['HTTP_X_FORWARDED_FOR'] || env['REMOTE_HOST'] || env['REMOTE_ADDR']
      end
      
      def login_ticket
        Castronaut::Models::LoginTicket.generate_from(client_host).ticket
      end

      def represent!
        ticket_granting_ticket_result = Castronaut::Models::TicketGrantingTicket.validate_cookie(ticket_generating_ticket_cookie)

        if ticket_granting_ticket_result.valid?
        messages << "You are currently logged in as #{ticket_granting_ticket_result.username}.  If this is not you, please log in below."
        end

        if redirection_loop?
          messages << "The client and server are unable to negotiate authentication.  Please try logging in again later."
        else

          if service
            if !renewal && ticket_granting_ticket_result.valid?
              service_ticket = Castronaut::Models::ServiceTicket.generate_ticket_for(service, client_host, ticket_granting_ticket_result.ticket)
            
              if service_ticket.service_uri
                return controller.redirect(service_ticket.service_uri, 303)
              else
                messages << "The target service your browser supplied appears to be invalid. Please contact your system administrator for help."
              end            
            end
          elsif gateway?
            messages << "The server cannot fulfill this gateway request because no service parameter was given."
          end
          
        end
        
        @your_mission = lambda { controller.erb :login, :locals => { :presenter => self } }
                
        self
      end
    
    end

  end
  
end