module VagrantPlugins
  module Parallels
    module Action
      class HandleGuestTools
        def initialize(app, env)
          @app = app
          @logger = Log4r::Logger.new('vagrant_parallels::action::handle_guest_tools')
        end

        def call(env)
          @machine = env[:machine]

          if !@machine.provider_config.check_guest_tools
            @logger.info('Not checking Parallels Tools because of configuration')
            return @app.call(env)
          end

          env[:ui].output(I18n.t('vagrant_parallels.actions.vm.handle_guest_tools.checking'))

          tools_state = parallels_tools_state

          if tools_state == :installed
            @logger.info('The proper version of Parallels Tools is already installed')
            return @app.call(env)
          elsif tools_state == :outdated
            env[:ui].warn(I18n.t('vagrant_parallels.actions.vm.handle_guest_tools.outdated'))
          else
            env[:ui].warn(I18n.t('vagrant_parallels.actions.vm.handle_guest_tools.not_detected'))
          end

          if !@machine.provider_config.update_guest_tools
            @logger.info('Not updating Parallels Tools because of configuration')
            return @app.call(env)
          end

          # Update/Install Parallels Tools
          if @machine.guest.capability?(:install_parallels_tools)
            env[:ui].output(I18n.t('vagrant_parallels.actions.vm.handle_guest_tools.installing'))
            @machine.guest.capability(:install_parallels_tools)

            # The VM should be rebooted to enable kernel modules
            # bundled with Parallels Tools.
            env[:ui].output(I18n.t('vagrant_parallels.actions.vm.handle_guest_tools.rebooting'))
            @machine.action(:simple_reboot)
          else
            env[:ui].warn(I18n.t('vagrant_parallels.actions.vm.handle_guest_tools.cant_install'))
          end

          # Continue
          @app.call(env)
        end

        private

        # Determines the state of Parallels Tools
        #
        # @return [Symbol] Parallels Tools state (ex. :installed, :outdated,
        # :not_installed, :possibly_installed)
        def parallels_tools_state
          # Sometimes tools can define their state with a little delay.
          # If it is 'possibly_installed', then just wait a bit and try again.
          3.times do
            state = @machine.provider.driver.read_guest_tools_state
            return state if state != :possibly_installed
            sleep 2
          end

          @machine.provider.driver.read_guest_tools_state
        end
      end
    end
  end
end