;;; Gacela, a GNU Common Lisp extension for fast games development
;;; Copyright (C) 2009 by Javier Sancho Fernandez <jsf at jsancho dot org>
;;;
;;; This program is free software: you can redistribute it and/or modify
;;; it under the terms of the GNU General Public License as published by
;;; the Free Software Foundation, either version 3 of the License, or
;;; (at your option) any later version.
;;;
;;; This program is distributed in the hope that it will be useful,
;;; but WITHOUT ANY WARRANTY; without even the implied warranty of
;;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
;;; GNU General Public License for more details.
;;;
;;; You should have received a copy of the GNU General Public License
;;; along with this program.  If not, see <http://www.gnu.org/licenses/>.


;;; World of Mob

;(in-package :gacela)

(defmacro makemob (name variables &rest methods)
  `(let ,variables
     (defun ,name (&rest args &aux (option (car args)))
       ,(mob-options methods))))

(defun mob-options (methods)
  (labels ((options (m &aux (option (car m)) (vars (cadr m)) (body (caddr m)))
		    (cond ((null m) nil)
			  (t (cons option (cons (lambda body (options (cdddr m))))))))
	  (cons 'case (cons 'option (options methods)))))

(defmacro defmob (name variables &key init logic render)
  `(let ((make-name ',(intern (concatenate 'string "MAKE-" (string name)))))
     (setf (symbol-function make-name)
	   (makemob ,variables :init ,init :logic ,logic :render ,render))
     make-name))

;(defmacro makemob (variables &key init logic render)
;  `(lambda
;     ,(if (null variables) () (cons '&key variables))
;     (mob-structure ,variables ,init ,logic ,render)))

(defmacro mob-structure (variables init logic render)
  `(list
    :init (lambda () ,init)
    :logic (lambda () ,logic)
    :render (lambda () ,render)
    :context (lambda ()
	       ,(if variables
		    `(mapcar #'list
			     ',(mapcar #'car+ variables)
			     (multiple-value-list
			      (values-list ,(cons 'list (mapcar #'car+ variables)))))
		  nil))))

(defun init-mob (mob)
  (funcall (getf mob :init)))

(defun logic-mob (mob)
  (funcall (getf mob :logic)))

(defun render-mob (mob)
  (funcall (getf mob :render)))

(let (running-mobs mobs-to-add mobs-to-quit)
  (defun mob-on (mob)
    (push mob mobs-to-add))

  (defun mob-off (mob)
    (push mob mobs-to-quit)))