module Rodauth
  module Rails
    # Roda plugin that sets up Rails flash integration.
    module Flash
      def self.load_dependencies(app)
        app.plugin :hooks
      end

      def self.configure(app)
        app.before { request.flash }        # load flash
        app.after  { request.commit_flash } # save flash
      end

      module InstanceMethods
        def flash
          request.flash
        end
      end

      module RequestMethods
        # If the redirect would bubble up outside of the Roda app, the after
        # hook would never get called, so we make sure to commit the flash.
        def redirect(*)
          commit_flash
          super
        end

        def flash
          rails_request.flash
        end

        def commit_flash
          if ActionPack.version >= Gem::Version.new("5.0")
            rails_request.commit_flash
          else
            # ActionPack 4.2 automatically commits flash
          end
        end

        private

        def rails_request
          ActionDispatch::Request.new(env)
        end
      end
    end
  end
end