module HoptoadNotifier
  module Rails
    module ActionControllerCatcher

      # Sets up an alias chain to catch exceptions when Rails does
      def self.included(base) #:nodoc:
        base.send(:alias_method, :rescue_action_in_public_without_hoptoad, :rescue_action_in_public)
        base.send(:alias_method, :rescue_action_in_public, :rescue_action_in_public_with_hoptoad)
      end

      private

      # Overrides the rescue_action method in ActionController::Base, but does not inhibit
      # any custom processing that is defined with Rails 2's exception helpers.
      def rescue_action_in_public_with_hoptoad(exception)
        unless hoptoad_ignore_user_agent?
          error_id = HoptoadNotifier.notify_or_ignore(exception, hoptoad_request_data)
          request.env['hoptoad.error_id'] = error_id
        end
        rescue_action_in_public_without_hoptoad(exception)
      end

      def hoptoad_ignore_user_agent? #:nodoc:
        # Rails 1.2.6 doesn't have request.user_agent, so check for it here
        user_agent = request.respond_to?(:user_agent) ? request.user_agent : request.env["HTTP_USER_AGENT"]
        HoptoadNotifier.configuration.ignore_user_agent.flatten.any? { |ua| ua === user_agent }
      end
    end
  end
end