;;; advice

;; buffer auto-association advice

(defun wg-auto-associate-buffer-helper (workgroup buffer assoc)
  "Associate BUFFER with WORKGROUP based on ASSOC.
See `wg-buffer-auto-association' for allowable values of ASSOC."
  (cond ((memq assoc '(weak strong))
         (wg-workgroup-associate-bufobj workgroup buffer (eq assoc 'weak)))
        ((functionp assoc)
         (wg-auto-associate-buffer-helper
          workgroup buffer (funcall assoc workgroup buffer)))
        (t nil)))

(defun wg-auto-associate-buffer (buffer &optional frame)
  "Conditionally associate BUFFER with the current workgroup in FRAME.
Frame defaults to `selected-frame'.  See `wg-buffer-auto-association'."
  (when wg-buffer-auto-association-on
    (wg-when-let ((wg (wg-current-workgroup t frame)))
      (unless (wg-workgroup-bufobj-association-type wg buffer)
        (wg-auto-associate-buffer-helper
         wg buffer (wg-local-value 'wg-buffer-auto-association wg))))))

(defadvice switch-to-buffer (after wg-auto-associate-buffer)
  "Automatically associate the buffer with the current workgroup."
  (wg-auto-associate-buffer ad-return-value))

(defadvice set-window-buffer (after wg-auto-associate-buffer)
  "Automatically associate the buffer with the current workgroup."
  (wg-auto-associate-buffer
   (ad-get-arg 1)
   (window-frame (or (ad-get-arg 0) (selected-window)))))


;; `wg-pre-window-configuration-change-hook' implementation advice

(macrolet ((define-p-w-c-c-h-advice
             (fn)
             `(defadvice ,fn (before wg-pre-window-configuration-change-hook)
                "Call `wg-update-working-wconfig-hook' before this
function to save up-to-date undo information before the
window-configuration changes."
                (run-hooks 'wg-pre-window-configuration-change-hook))))
  (define-p-w-c-c-h-advice split-window)
  (define-p-w-c-c-h-advice enlarge-window)
  (define-p-w-c-c-h-advice delete-window)
  (define-p-w-c-c-h-advice delete-other-windows)
  (define-p-w-c-c-h-advice delete-windows-on)
  (define-p-w-c-c-h-advice switch-to-buffer)
  (define-p-w-c-c-h-advice set-window-buffer))


;; `save-buffers-kill-emacs' advice

(defadvice save-buffers-kill-emacs (around wg-freeze-wconfig)
  "`save-buffers-kill-emacs' calls `list-processes' when active
processes exist, screwing up the window config right before
Workgroups saves it.  This advice freezes `wg-current-wconfig' in
its correct state, prior to any window-config changes caused by
`s-b-k-e'."
  (wg-with-current-wconfig nil (wg-frame-to-wconfig)
    ad-do-it))


;; `select-frame' advice

(defadvice select-frame (before wg-update-current-workgroup-working-wconfig)
  "Update `selected-frame's current workgroup's working-wconfig
before selecting a new frame."
  (when wg-update-current-workgroup-working-wconfig-on-select-frame
    (wg-update-current-workgroup-working-wconfig)))


;; enable all advice

(defun wg-enable-all-advice ()
  "Enable and activate all of Workgroups' advice."

  ;; From advice.el:
  ;;
  ;; (defmacro ad-define-subr-args (subr arglist)
  ;;   `(put ,subr 'ad-subr-arglist (list ,arglist)))

  ;; switch-to-buffer
  ;; (ad-define-subr-args 'switch-to-buffer '(buffer-or-name &optional norecord))
  (ad-enable-advice 'switch-to-buffer 'after 'wg-auto-associate-buffer)
  (ad-enable-advice
   'switch-to-buffer 'before 'wg-pre-window-configuration-change-hook)
  (ad-activate 'switch-to-buffer)

  ;; set-window-buffer
  ;; (ad-define-subr-args 'set-window-buffer '(window buffer-or-name &optional keep-margins))
  (ad-enable-advice 'set-window-buffer 'after 'wg-auto-associate-buffer)
  (ad-enable-advice
   'set-window-buffer 'before 'wg-pre-window-configuration-change-hook)
  (ad-activate 'set-window-buffer)

  ;; split-window
  (ad-enable-advice
   'split-window 'before 'wg-pre-window-configuration-change-hook)
  (ad-activate 'split-window)

  ;; enlarge-window
  (ad-enable-advice
   'enlarge-window 'before 'wg-pre-window-configuration-change-hook)
  (ad-activate 'enlarge-window)

  ;; delete-window
  (ad-enable-advice
   'delete-window 'before 'wg-pre-window-configuration-change-hook)
  (ad-activate 'delete-window)

  ;; delete-other-windows
  (ad-enable-advice
   'delete-other-windows 'before 'wg-pre-window-configuration-change-hook)
  (ad-activate 'delete-other-windows)

  ;; delete-windows-on
  (ad-enable-advice
   'delete-windows-on 'before 'wg-pre-window-configuration-change-hook)
  (ad-activate 'delete-windows-on)

  ;; save-buffers-kill-emacs
  (ad-enable-advice 'save-buffers-kill-emacs 'around 'wg-freeze-wconfig)
  (ad-activate 'save-buffers-kill-emacs)

  ;; select-frame
  ;;(ad-enable-advice 'select-frame 'before
  ;;                  'wg-update-current-workgroup-working-wconfig)
  ;;(ad-activate 'select-frame)
  )


;; disable all advice
;; (wg-disable-all-advice)
(defun wg-disable-all-advice ()
  "Disable and deactivate all of Workgroups' advice."

  ;; switch-to-buffer
  (ad-disable-advice 'switch-to-buffer 'after 'wg-auto-associate-buffer)
  (ad-disable-advice
   'switch-to-buffer 'before 'wg-pre-window-configuration-change-hook)
  (ad-deactivate 'switch-to-buffer)

  ;; set-window-buffer
  (ad-disable-advice 'set-window-buffer 'after 'wg-auto-associate-buffer)
  (ad-disable-advice
   'set-window-buffer 'before 'wg-pre-window-configuration-change-hook)
  (ad-deactivate 'set-window-buffer)

  ;; split-window
  (ad-disable-advice
   'split-window 'before 'wg-pre-window-configuration-change-hook)
  (ad-deactivate 'split-window)

  ;; enlarge-window
  (ad-disable-advice
   'enlarge-window 'before 'wg-pre-window-configuration-change-hook)
  (ad-deactivate 'enlarge-window)

  ;; delete-window
  (ad-disable-advice
   'delete-window 'before 'wg-pre-window-configuration-change-hook)
  (ad-deactivate 'delete-window)

  ;; delete-other-windows
  (ad-disable-advice
   'delete-other-windows 'before 'wg-pre-window-configuration-change-hook)
  (ad-deactivate 'delete-other-windows)

  ;; delete-windows-on
  (ad-disable-advice
   'delete-windows-on 'before 'wg-pre-window-configuration-change-hook)
  (ad-deactivate 'delete-windows-on)

  ;; save-buffers-kill-emacs
  (ad-disable-advice 'save-buffers-kill-emacs 'around 'wg-freeze-wconfig)
  (ad-deactivate 'save-buffers-kill-emacs)

  ;; select-frame
  ;;(ad-disable-advice 'select-frame 'before
  ;;                   'wg-update-current-workgroup-working-wconfig)
  ;;(ad-deactivate 'select-frame)

  )

(provide 'workgroups-advice)