;;;; cl-scopes/core - here comes the real action

(defpackage :scopes/core
  (:use :common-lisp)
  (:local-nicknames (:config :scopes/config))
  (:export #:config #:service-config
           #:context #:name #:actions #:send
           #:action-spec
           #:printer))

(in-package :scopes/core)

;;;; config

(defclass config (config:root) 
  (services))

(defclass service-config (config:base)
  (start))

;;;; actions

(defclass action-spec ()
  ((pattern :initarg :pattern :initform nil)
   (handlers :reader handlers :initarg :handlers)))

;;;; context

(defclass context () 
  ((name :reader name :initarg :name)
   (actions :accessor actions :initform nil)))

(defgeneric send (rcvr msg)
  (:method ((rcvr context) msg)
    (let* ((acts (actions rcvr))
           (selected (car acts)))
      (dolist (hdlr (handlers selected))
        (funcall hdlr rcvr msg)))))

(defvar *context* nil)

;;;; simple printer service

(defun do-print (ctx msg)
  (declare (ignore ctx))
  (format t "~&~s~%" msg))

(defclass printer (context)
  ((actions :initform 
            (list (make-instance 'action-spec 
                                 :handlers (list #'do-print))))))

(defun printer (name)
  (make-instance 'printer :name name))