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

    # Override process to consider warden.
    def process(*)
      result = nil
      _catch_warden { result = super }
      result
    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 ||= begin
        manager = Warden::Manager.new(nil) do |config|
          config.merge! Devise.warden_config
        end
        @request.env['warden'] = Warden::Proxy.new(@request.env, manager)
      end
    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

    protected

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

      if result.is_a?(Hash) && !warden.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
end