;;; org-timer.el --- The relative timer code for Org-mode

;; Copyright (C) 2008-2014 Free Software Foundation, Inc.

;; Author: Carsten Dominik <carsten at orgmode dot org>
;; Keywords: outlines, hypermedia, calendar, wp
;; Homepage: http://orgmode.org
;;
;; This file is part of GNU Emacs.
;;
;; GNU Emacs 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.

;; GNU Emacs 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 GNU Emacs.  If not, see <http://www.gnu.org/licenses/>.
;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
;;
;;; Commentary:

;; This file contains the relative timer code for Org-mode

;;; Code:

(require 'org)

(declare-function org-notify "org-clock" (notification &optional play-sound))
(declare-function org-agenda-error "org-agenda" ())

(defvar org-timer-start-time nil
  "t=0 for the running timer.")

(defvar org-timer-pause-time nil
  "Time when the timer was paused.")

(defconst org-timer-re "\\([-+]?[0-9]+\\):\\([0-9]\\{2\\}\\):\\([0-9]\\{2\\}\\)"
  "Regular expression used to match timer stamps.")

(defcustom org-timer-format "%s "
  "The format to insert the time of the timer.
This format must contain one instance of \"%s\" which will be replaced by
the value of the relative timer."
  :group 'org-time
  :type 'string)

(defcustom org-timer-default-timer 0
  "The default timer when a timer is set.
When 0, the user is prompted for a value."
  :group 'org-time
  :version "24.1"
  :type 'number)

(defcustom org-timer-display 'mode-line
  "When a timer is running, org-mode can display it in the mode
line and/or frame title.
Allowed values are:

both         displays in both mode line and frame title
mode-line    displays only in mode line (default)
frame-title  displays only in frame title
nil          current timer is not displayed"
  :group 'org-time
  :type '(choice
	  (const :tag "Mode line" mode-line)
	  (const :tag "Frame title" frame-title)
	  (const :tag "Both" both)
	  (const :tag "None" nil)))

(defvar org-timer-start-hook nil
  "Hook run after relative timer is started.")

(defvar org-timer-stop-hook nil
  "Hook run before relative timer is stopped.")

(defvar org-timer-pause-hook nil
  "Hook run before relative timer is paused.")

(defvar org-timer-continue-hook nil
  "Hook run after relative timer is continued.")

(defvar org-timer-set-hook nil
  "Hook run after countdown timer is set.")

(defvar org-timer-done-hook nil
  "Hook run after countdown timer reaches zero.")

(defvar org-timer-cancel-hook nil
  "Hook run before countdown timer is canceled.")

;;;###autoload
(defun org-timer-start (&optional offset)
  "Set the starting time for the relative timer to now.
When called with prefix argument OFFSET, prompt the user for an offset time,
with the default taken from a timer stamp at point, if any.
If OFFSET is a string or an integer, it is directly taken to be the offset
without user interaction.
When called with a double prefix arg, all timer strings in the active
region will be shifted by a specific amount.  You will be prompted for
the amount, with the default to make the first timer string in
the region 0:00:00."
  (interactive "P")
  (if (equal offset '(16))
      (call-interactively 'org-timer-change-times-in-region)
    (let (delta def s)
      (if (not offset)
	  (setq org-timer-start-time (current-time))
	(cond
	 ((integerp offset) (setq delta offset))
	 ((stringp offset) (setq delta (org-timer-hms-to-secs offset)))
	 (t
	  (setq def (if (org-in-regexp org-timer-re)
			(match-string 0)
		      "0:00:00")
		s (read-string
		   (format "Restart timer with offset [%s]: " def)))
	  (unless (string-match "\\S-" s) (setq s def))
	  (setq delta (org-timer-hms-to-secs (org-timer-fix-incomplete s)))))
	(setq org-timer-start-time
	      (seconds-to-time
	       (- (org-float-time) delta))))
      (setq org-timer-pause-time nil)
      (org-timer-set-mode-line 'on)
      (message "Timer start time set to %s, current value is %s"
	       (format-time-string "%T" org-timer-start-time)
	       (org-timer-secs-to-hms (or delta 0)))
      (run-hooks 'org-timer-start-hook))))

(defun org-timer-pause-or-continue (&optional stop)
  "Pause or continue the relative timer.
With prefix arg STOP, stop it entirely."
  (interactive "P")
  (cond
   (stop (org-timer-stop))
   ((not org-timer-start-time) (error "No timer is running"))
   (org-timer-pause-time
    ;; timer is paused, continue
    (setq org-timer-start-time
	  (seconds-to-time
	   (-
	    (org-float-time)
	    (- (org-float-time org-timer-pause-time)
	       (org-float-time org-timer-start-time))))
	  org-timer-pause-time nil)
    (org-timer-set-mode-line 'on)
    (run-hooks 'org-timer-continue-hook)
    (message "Timer continues at %s" (org-timer-value-string)))
   (t
    ;; pause timer
    (run-hooks 'org-timer-pause-hook)
    (setq org-timer-pause-time (current-time))
    (org-timer-set-mode-line 'pause)
    (message "Timer paused at %s" (org-timer-value-string)))))

(defun org-timer-stop ()
  "Stop the relative timer."
  (interactive)
  (run-hooks 'org-timer-stop-hook)
  (setq org-timer-start-time nil
	org-timer-pause-time nil)
  (org-timer-set-mode-line 'off)
  (message "Timer stopped"))

;;;###autoload
(defun org-timer (&optional restart no-insert-p)
  "Insert a H:MM:SS string from the timer into the buffer.
The first time this command is used, the timer is started.  When used with
a \\[universal-argument] prefix, force restarting the timer.
When used with a double prefix argument \\[universal-argument], change all the timer string
in the region by a fixed amount.  This can be used to recalibrate a timer
that was not started at the correct moment.

If NO-INSERT-P is non-nil, return the string instead of inserting
it in the buffer."
  (interactive "P")
  (if (equal restart '(16))
      (org-timer-start restart)
    (when (or (equal restart '(4)) (not org-timer-start-time))
      (org-timer-start))
    (if no-insert-p
	(org-timer-value-string)
      (insert (org-timer-value-string)))))

(defun org-timer-value-string ()
  "Set the timer string."
  (format org-timer-format
	  (org-timer-secs-to-hms
	   (abs (floor (org-timer-seconds))))))

(defvar org-timer-timer-is-countdown nil)
(defun org-timer-seconds ()
  (if org-timer-timer-is-countdown
      (- (org-float-time org-timer-start-time)
	 (org-float-time (current-time)))
    (- (org-float-time (or org-timer-pause-time (current-time)))
       (org-float-time org-timer-start-time))))

;;;###autoload
(defun org-timer-change-times-in-region (beg end delta)
  "Change all h:mm:ss time in region by a DELTA."
  (interactive
   "r\nsEnter time difference like \"-1:08:26\".  Default is first time to zero: ")
  (let ((re "[-+]?[0-9]+:[0-9]\\{2\\}:[0-9]\\{2\\}") p)
    (unless (string-match "\\S-" delta)
      (save-excursion
	(goto-char beg)
	(when (re-search-forward re end t)
	  (setq delta (match-string 0))
	  (if (equal (string-to-char delta) ?-)
	      (setq delta (substring delta 1))
	    (setq delta (concat "-" delta))))))
    (setq delta (org-timer-hms-to-secs (org-timer-fix-incomplete delta)))
    (when (= delta 0) (error "No change"))
    (save-excursion
      (goto-char end)
      (while (re-search-backward re beg t)
	(setq p (point))
	(replace-match
	 (save-match-data
	   (org-timer-secs-to-hms (+ (org-timer-hms-to-secs (match-string 0)) delta)))
	 t t)
	(goto-char p)))))

;;;###autoload
(defun org-timer-item (&optional arg)
  "Insert a description-type item with the current timer value."
  (interactive "P")
  (let ((itemp (org-in-item-p)) (pos (point)))
    (cond
     ;; In a timer list, insert with `org-list-insert-item',
     ;; then fix the list.
     ((and itemp (goto-char itemp) (org-at-item-timer-p))
      (let* ((struct (org-list-struct))
	     (prevs (org-list-prevs-alist struct))
	     (s (concat (org-timer (when arg '(4)) t) ":: ")))
	(setq struct (org-list-insert-item pos struct prevs nil s))
	(org-list-write-struct struct (org-list-parents-alist struct))
	(looking-at org-list-full-item-re)
	(goto-char (match-end 0))))
     ;; In a list of another type, don't break anything: throw an error.
     (itemp (goto-char pos) (error "This is not a timer list"))
     ;; Else, start a new list.
     (t
      (beginning-of-line)
      (org-indent-line)
      (insert  "- ")
      (org-timer (when arg '(4)))
      (insert ":: ")))))

(defun org-timer-fix-incomplete (hms)
  "If hms is a H:MM:SS string with missing hour or hour and minute, fix it."
  (if (string-match "\\(?:\\([0-9]+:\\)?\\([0-9]+:\\)\\)?\\([0-9]+\\)" hms)
      (replace-match
       (format "%d:%02d:%02d"
	       (if (match-end 1) (string-to-number (match-string 1 hms)) 0)
	       (if (match-end 2) (string-to-number (match-string 2 hms)) 0)
	       (string-to-number (match-string 3 hms)))
       t t hms)
    (error "Cannot parse HMS string \"%s\"" hms)))

(defun org-timer-hms-to-secs (hms)
  "Convert h:mm:ss string to an integer time.
If the string starts with a minus sign, the integer will be negative."
  (if (not (string-match
	    "\\([-+]?[0-9]+\\):\\([0-9]\\{2\\}\\):\\([0-9]\\{2\\}\\)"
	    hms))
      0
    (let* ((h (string-to-number (match-string 1 hms)))
	   (m (string-to-number (match-string 2 hms)))
	   (s (string-to-number (match-string 3 hms)))
	   (sign (equal (substring (match-string 1 hms) 0 1) "-")))
      (setq h (abs h))
      (* (if sign -1 1) (+ s (* 60 (+ m (* 60 h))))))))

(defun org-timer-secs-to-hms (s)
  "Convert integer S into h:mm:ss.
If the integer is negative, the string will start with \"-\"."
  (let (sign m h)
    (setq sign (if (< s 0) "-" "")
	  s (abs s)
	  m (/ s 60) s (- s (* 60 m))
	  h (/ m 60) m (- m (* 60 h)))
    (format "%s%d:%02d:%02d" sign h m s)))

(defvar org-timer-mode-line-timer nil)
(defvar org-timer-mode-line-string nil)

(defun org-timer-set-mode-line (value)
  "Set the mode-line display of the relative timer.
VALUE can be `on', `off', or `pause'."
  (when (or (eq org-timer-display 'mode-line)
	    (eq org-timer-display 'both))
    (or global-mode-string (setq global-mode-string '("")))
    (or (memq 'org-timer-mode-line-string global-mode-string)
	(setq global-mode-string
	      (append global-mode-string '(org-timer-mode-line-string)))))
  (when (or (eq org-timer-display 'frame-title)
	    (eq org-timer-display 'both))
    (or (memq 'org-timer-mode-line-string frame-title-format)
	(setq frame-title-format
	      (append frame-title-format '(org-timer-mode-line-string)))))
  (cond
   ((equal value 'off)
    (when org-timer-mode-line-timer
      (cancel-timer org-timer-mode-line-timer)
      (setq org-timer-mode-line-timer nil))
    (when (or (eq org-timer-display 'mode-line)
	      (eq org-timer-display 'both))
      (setq global-mode-string
	    (delq 'org-timer-mode-line-string global-mode-string)))
    (when (or (eq org-timer-display 'frame-title)
	      (eq org-timer-display 'both))
      (setq frame-title-format
	    (delq 'org-timer-mode-line-string frame-title-format)))
    (force-mode-line-update))
   ((equal value 'pause)
    (when org-timer-mode-line-timer
      (cancel-timer org-timer-mode-line-timer)
      (setq org-timer-mode-line-timer nil)))
   ((equal value 'on)
    (when (or (eq org-timer-display 'mode-line)
	      (eq org-timer-display 'both))
      (or global-mode-string (setq global-mode-string '("")))
      (or (memq 'org-timer-mode-line-string global-mode-string)
	  (setq global-mode-string
		(append global-mode-string '(org-timer-mode-line-string)))))
    (when (or (eq org-timer-display 'frame-title)
	      (eq org-timer-display 'both))
      (or (memq 'org-timer-mode-line-string frame-title-format)
	  (setq frame-title-format
		(append frame-title-format '(org-timer-mode-line-string)))))
    (org-timer-update-mode-line)
    (when org-timer-mode-line-timer
      (cancel-timer org-timer-mode-line-timer)
      (setq org-timer-mode-line-timer nil))
    (when org-timer-display
      (setq org-timer-mode-line-timer
	    (run-with-timer 1 1 'org-timer-update-mode-line))))))

(defun org-timer-update-mode-line ()
  "Update the timer time in the mode line."
  (if org-timer-pause-time
      nil
    (setq org-timer-mode-line-string
	  (concat " <" (substring (org-timer-value-string) 0 -1) ">"))
    (force-mode-line-update)))

(defvar org-timer-current-timer nil)
(defun org-timer-cancel-timer ()
  "Cancel the current timer."
  (interactive)
  (if (not org-timer-current-timer)
      (message "No timer to cancel")
    (run-hooks 'org-timer-cancel-hook)
    (cancel-timer org-timer-current-timer)
    (setq org-timer-current-timer nil
	  org-timer-start-time nil
	  org-timer-timer-is-countdown nil)
    (org-timer-set-mode-line 'off)
    (message "Last timer canceled")))

(defun org-timer-show-remaining-time ()
  "Display the remaining time before the timer ends."
  (interactive)
  (require 'time)
  (if (not org-timer-current-timer)
      (message "No timer set")
    (let* ((rtime (decode-time
		   (time-subtract (timer--time org-timer-current-timer)
				  (current-time))))
	   (rsecs (nth 0 rtime))
	   (rmins (nth 1 rtime)))
      (message "%d minute(s) %d seconds left before next time out"
	       rmins rsecs))))

(defvar org-clock-sound)

;;;###autoload
(defun org-timer-set-timer (&optional opt)
  "Prompt for a duration and set a timer.

If `org-timer-default-timer' is not zero, suggest this value as
the default duration for the timer.  If a timer is already set,
prompt the user if she wants to replace it.

Called with a numeric prefix argument, use this numeric value as
the duration of the timer.

Called with a `C-u' prefix arguments, use `org-timer-default-timer'
without prompting the user for a duration.

With two `C-u' prefix arguments, use `org-timer-default-timer'
without prompting the user for a duration and automatically
replace any running timer.

By default, the timer duration will be set to the number of
minutes in the Effort property, if any.  You can ignore this by
using three `C-u' prefix arguments."
  (interactive "P")
  (let* ((effort-minutes (org-get-at-eol 'effort-minutes 1))
	 (minutes (or (and (not (equal opt '(64)))
			   effort-minutes
			   (number-to-string effort-minutes))
		     (and (numberp opt) (number-to-string opt))
		     (and (listp opt) (not (null opt))
			  (number-to-string org-timer-default-timer))
		     (read-from-minibuffer
		      "How many minutes left? "
		      (if (not (eq org-timer-default-timer 0))
			  (number-to-string org-timer-default-timer))))))
    (if (not (string-match "[0-9]+" minutes))
	(org-timer-show-remaining-time)
      (let* ((mins (string-to-number (match-string 0 minutes)))
	     (secs (* mins 60))
	     (hl (cond
		  ((string-match "Org Agenda" (buffer-name))
		   (let* ((marker (or (get-text-property (point) 'org-marker)
				      (org-agenda-error)))
			  (hdmarker (or (get-text-property (point) 'org-hd-marker)
					marker))
			  (pos (marker-position marker)))
		     (with-current-buffer (marker-buffer marker)
		       (widen)
		       (goto-char pos)
		       (org-show-entry)
		       (or (ignore-errors (org-get-heading))
			   (concat "File:" (file-name-nondirectory (buffer-file-name)))))))
		  ((derived-mode-p 'org-mode)
		   (or (ignore-errors (org-get-heading))
		       (concat "File:" (file-name-nondirectory (buffer-file-name)))))
		  (t (error "Not in an Org buffer"))))
	     timer-set)
	(if (or (and org-timer-current-timer
		     (or (equal opt '(16))
			 (y-or-n-p "Replace current timer? ")))
		(not org-timer-current-timer))
	    (progn
	      (require 'org-clock)
	      (when org-timer-current-timer
		(cancel-timer org-timer-current-timer))
	      (setq org-timer-current-timer
		    (run-with-timer
		     secs nil `(lambda ()
				 (setq org-timer-current-timer nil)
				 (setq org-timer-start-time nil)
				 (org-notify ,(format "%s: time out" hl) ,org-clock-sound)
				 (setq org-timer-timer-is-countdown nil)
				 (org-timer-set-mode-line 'off)
				 (run-hooks 'org-timer-done-hook))))
	      (run-hooks 'org-timer-set-hook)
	      (setq org-timer-timer-is-countdown t
		    org-timer-start-time
		    (time-add (current-time) (seconds-to-time (* mins 60))))
	      (org-timer-set-mode-line 'on))
	  (message "No timer set"))))))

(provide 'org-timer)

;; Local variables:
;; generated-autoload-file: "org-loaddefs.el"
;; End:

;;; org-timer.el ends here