module Devise
  # Devise::TestHelpers provides a facility to test controllers in isolation
  # when using ActionController::TestCase allowing you to quickly sign_in or
  # sign_out a user. Do not use Devise::TestHelpers in integration tests.
  #
  # Notice you should not test Warden specific behavior (like Warden callbacks)
  # using Devise::TestHelpers since it is a stub of the actual behavior. Such
  # callbacks should be tested in your integration suite instead.
  module TestHelpers
    def self.included(base)
      base.class_eval do
        setup :setup_controller_for_warden, :warden if respond_to?(:setup)
      end
    end

    # This is a Warden::Proxy customized for functional tests. It's meant to
    # some of Warden::Manager responsibilities, as retrieving configuration
    # options and calling the FailureApp.
    class TestWarden < Warden::Proxy #:nodoc:
      attr_reader :controller

      def initialize(controller)
        @controller = controller
        manager = Warden::Manager.new(nil) do |config|
          config.merge! Devise.warden_config
        end
        super(controller.request.env, manager)
      end

      def authenticate!(*args)
        catch_with_redirect { super }
      end

      def user(*args)
        catch_with_redirect { super }
      end

      def catch_with_redirect(&block)
        result = catch(:warden, &block)

        if result.is_a?(Hash) && !custom_failure? && !@controller.send(:performed?)
          result[:action] ||= :unauthenticated

          env = @controller.request.env
          env["PATH_INFO"] = "/#{result[:action]}"
          env["warden.options"] = result
          Warden::Manager._run_callbacks(:before_failure, env, result)

          status, headers, body = Devise.warden_config[:failure_app].call(env).to_a
          @controller.send :render, :status => status, :text => body,
            :content_type => headers["Content-Type"], :location => headers["Location"]

          nil
        else
          result
        end
      end
    end

    # We need to setup the environment variables and the response in the controller.
    def setup_controller_for_warden #:nodoc:
      @request.env['action_controller.instance'] = @controller
    end

    # Quick access to Warden::Proxy.
    def warden #:nodoc:
      @warden ||= (@request.env['warden'] = TestWarden.new(@controller))
    end

    # sign_in a given resource by storing its keys in the session.
    # This method bypass any warden authentication callback.
    #
    # Examples:
    #
    #   sign_in :user, @user   # sign_in(scope, resource)
    #   sign_in @user          # sign_in(resource)
    #
    def sign_in(resource_or_scope, resource=nil)
      scope    ||= Devise::Mapping.find_scope!(resource_or_scope)
      resource ||= resource_or_scope
      warden.session_serializer.store(resource, scope)
    end

    # Sign out a given resource or scope by calling logout on Warden.
    # This method bypass any warden logout callback.
    #
    # Examples:
    #
    #   sign_out :user     # sign_out(scope)
    #   sign_out @user     # sign_out(resource)
    #
    def sign_out(resource_or_scope)
      scope = Devise::Mapping.find_scope!(resource_or_scope)
      @controller.instance_variable_set(:"@current_#{scope}", nil)
      user = warden.instance_variable_get(:@users).delete(scope)
      warden.session_serializer.delete(scope, user)
    end

  end
end