(in-package #:mulk.objective-cl)


(defgeneric objc-eql (x y))
(defgeneric objc-equal (x y))


(defun truep (b)
  (not (or (zerop b)
           (null b))))


(defun id-eql (x y)
  (pointer-eq (pointer-to x) (pointer-to y)))


(defun id-equal (x y)
  (truep (if (typep x '(or id objc-class exception))
             (invoke x :is-equal y)
             (progn
               (assert (typep y '(or id objc-class exception)))
               (invoke y :is-equal x)))))


(defun objc-typep (x class-designator)
  (objc-eql (invoke x 'class)
            (etypecase x
              (class x)
              (id (invoke x 'class))
              ((or string symbol) (find-objc-class class-designator t)))))


(defmethod objc-eql (x y)
  (cl:eql x y))

(defmethod objc-eql ((x id) y)
  (id-eql x y))

(defmethod objc-eql (x (y id))
  (id-eql x y))

(defmethod objc-eql ((x objc-class) y)
  (id-eql x y))

(defmethod objc-eql (x (y objc-class))
  (id-eql x y))

(defmethod objc-eql ((x exception) y)
  (id-eql x y))

(defmethod objc-eql (x (y exception))
  (id-eql x y))

(defmethod objc-eql ((x selector) (y selector))
  (eql (selector-name x) (selector-name y)))

(defmethod objc-eql ((x selector) (y string))
  (eql (selector-name x) y))

(defmethod objc-eql ((x string) (y selector))
  (eql x (selector-name y)))


(defmethod objc-equal (x y)
  (cl:equal x y))

(defmethod objc-equal ((x id) y)
  (id-equal x y))

(defmethod objc-equal (x (y id))
  (id-equal x y))

(defmethod objc-equal ((x objc-class) y)
  (id-equal x y))

(defmethod objc-equal (x (y objc-class))
  (id-equal x y))

(defmethod objc-equal ((x exception) y)
  (id-equal x y))

(defmethod objc-equal (x (y exception))
  (id-equal x y))

(defmethod objc-equal ((x selector) (y selector))
  (equal (selector-name x) (selector-name y)))

(defmethod objc-equal ((x selector) (y string))
  (equal (selector-name x) y))

(defmethod objc-equal ((x string) (y selector))
  (equal x (selector-name y)))


;;; (@* "Object Representation")
(defmethod print-object ((object id) stream)
  (print-unreadable-object (object stream)
    (format stream "~A `~A' {~X}"
            (objcl-class-name (primitive-invoke object "class" :id))
            (primitive-invoke (primitive-invoke object "description" :id)
                              "UTF8String" :string)
            (primitive-invoke object "hash" :unsigned-int))))


(defmethod print-object ((class objc-class) stream)
  (print-unreadable-object (class stream)
    (format stream "~S ~A {~X}"
            'objc-class
            (objcl-class-name class)
            (primitive-invoke class "hash" :unsigned-int))))


(defmethod print-object ((selector selector) stream)
  (print-unreadable-object (selector stream)
    (format stream "~S `~A'"
            'selector
            (selector-name selector))))


(defmethod print-object ((exception exception) stream)
  (print-unreadable-object (exception stream)
    (format stream "~S ~A {~X}"
            'exception
            (primitive-invoke (primitive-invoke exception "name" :id)
                              "UTF8String" :string)
            (primitive-invoke exception "hash" :unsigned-int))))