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;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
;;
;; Implements a chess clock
;;
(defvar chess-clock-last-time nil)
(defvar chess-clock-timer nil)
(make-variable-buffer-local 'chess-clock-last-time)
(make-variable-buffer-local 'chess-clock-timer)
(defsubst chess-clock-add-seconds (time seconds)
"To TIME, add SECONDS. Return result as a time value."
(let* ((secint (truncate seconds))
(hi (/ secint 65536))
(lo (% secint 65536))
(calc (+ (cadr time) lo)))
(if (< calc 65536)
(list (+ (car time) hi) calc)
(list (+ (car time) (1+ hi)) (% calc 65536)))))
(defsubst chess-clock-time-to-seconds (time)
"Convert TIME to a floating point number."
(+ (* (car time) 65536.0)
(cadr time)
(/ (or (car (cdr (cdr time))) 0) 1000000.0)))
(defsubst chess-clock-time-diff (t1 t2)
"Return the difference in seconds between T1 and T2."
(- (chess-clock-time-to-seconds t1)
(chess-clock-time-to-seconds t2)))
(defun chess-clock-handler (game event &rest args)
(cond
((eq event 'initialize)
(unless (chess-game-data game 'white-remaining)
(chess-game-set-data game 'white-remaining (float (or (car args) 0))))
(unless (chess-game-data game 'black-remaining)
(chess-game-set-data game 'black-remaining (float (or (car args) 0))))
(setq chess-clock-timer
(run-with-timer 0 1 'chess-clock-tick-tock (current-buffer)))
t)
((eq event 'post-undo)
(let ((last-ply (car (last (chess-game-plies game) 2))))
(chess-game-set-data game 'white-remaining
(chess-ply-keyword last-ply :white))
(chess-game-set-data game 'black-remaining
(chess-ply-keyword last-ply :black))))
((eq event 'move)
(when (> (chess-game-index game) 0)
(let ((last-ply (car (last (chess-game-plies game) 2))))
(chess-ply-set-keyword last-ply :white
(chess-game-data game 'white-remaining))
(chess-ply-set-keyword last-ply :black
(chess-game-data game 'black-remaining)))))
((eq event 'destroy)
(cancel-timer chess-clock-timer))))
(defvar chess-clock-tick-tocking nil)
(defun chess-clock-tick-tock (module)
(unless chess-clock-tick-tocking
(let ((chess-clock-tick-tocking t))
(with-current-buffer module
(let ((last-time chess-clock-last-time) counter)
(setq chess-clock-last-time (current-time))
(when (> (chess-game-index chess-module-game) 0)
(if (chess-pos-side-to-move (chess-game-pos chess-module-game))
(setq counter 'white-remaining)
(setq counter 'black-remaining))
(chess-game-set-data
chess-module-game counter
(- (chess-game-data chess-module-game counter)
(chess-clock-time-diff chess-clock-last-time last-time))))))
(force-mode-line-update))))
(provide 'chess-clock)
;;; chess-clock.el ends here
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