module Devise
  module Controllers
    # Provide sign in and sign out functionality.
    # Included by default in all controllers.
    module SignInOut
      # Return true if the given scope is signed in session. If no scope given, return
      # true if any scope is signed in. Does not run authentication hooks.
      def signed_in?(scope=nil)
        [scope || Devise.mappings.keys].flatten.any? do |_scope|
          warden.authenticate?(scope: _scope)
        end
      end

      # Sign in a user that already was authenticated. This helper is useful for logging
      # users in after sign up. All options given to sign_in is passed forward
      # to the set_user method in warden.
      #
      # Examples:
      #
      #   sign_in :user, @user                      # sign_in(scope, resource)
      #   sign_in @user                             # sign_in(resource)
      #   sign_in @user, event: :authentication     # sign_in(resource, options)
      #   sign_in @user, store: false               # sign_in(resource, options)
      #
      def sign_in(resource_or_scope, *args)
        options  = args.extract_options!
        scope    = Devise::Mapping.find_scope!(resource_or_scope)
        resource = args.last || resource_or_scope

        expire_data_after_sign_in!

        if options[:bypass]
          ActiveSupport::Deprecation.warn(<<-DEPRECATION.strip_heredoc, caller)
          [Devise] bypass option is deprecated and it will be removed in future version of Devise.
          Please use bypass_sign_in method instead.
          Example:

            bypass_sign_in(user)
          DEPRECATION
          warden.session_serializer.store(resource, scope)
        elsif warden.user(scope) == resource && !options.delete(:force)
          # Do nothing. User already signed in and we are not forcing it.
          true
        else
          warden.set_user(resource, options.merge!(scope: scope))
        end
      end

      # Sign in a user bypassing the warden callbacks and stores the user
      # straight in session. This option is useful in cases the user is already
      # signed in, but we want to refresh the credentials in session.
      #
      # Examples:
      #
      #   bypass_sign_in @user, scope: :user
      #   bypass_sign_in @user
      def bypass_sign_in(resource, scope: nil)
        scope ||= Devise::Mapping.find_scope!(resource)
        expire_data_after_sign_in!
        warden.session_serializer.store(resource, scope)
      end

      # Sign out a given user or scope. This helper is useful for signing out a user
      # after deleting accounts. Returns true if there was a logout and false if there
      # is no user logged in on the referred scope
      #
      # Examples:
      #
      #   sign_out :user     # sign_out(scope)
      #   sign_out @user     # sign_out(resource)
      #
      def sign_out(resource_or_scope=nil)
        return sign_out_all_scopes unless resource_or_scope
        scope = Devise::Mapping.find_scope!(resource_or_scope)
        user = warden.user(scope: scope, run_callbacks: false) # If there is no user

        warden.logout(scope)
        warden.clear_strategies_cache!(scope: scope)
        instance_variable_set(:"@current_#{scope}", nil)

        !!user
      end

      # Sign out all active users or scopes. This helper is useful for signing out all roles
      # in one click. This signs out ALL scopes in warden. Returns true if there was at least one logout
      # and false if there was no user logged in on all scopes.
      def sign_out_all_scopes(lock=true)
        users = Devise.mappings.keys.map { |s| warden.user(scope: s, run_callbacks: false) }

        warden.logout
        expire_data_after_sign_out!
        warden.clear_strategies_cache!
        warden.lock! if lock

        users.any?
      end

      private

      def expire_data_after_sign_in!
        # session.keys will return an empty array if the session is not yet loaded.
        # This is a bug in both Rack and Rails.
        # A call to #empty? forces the session to be loaded.
        session.empty?
        session.keys.grep(/^devise\./).each { |k| session.delete(k) }
      end

      alias :expire_data_after_sign_out! :expire_data_after_sign_in!
    end
  end
end
