;; -*-Emacs-Lisp-*-

;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
;; 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, 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/>.  ;;
;;                                                                       ;;
;; Written by and Copyright (C) Francois Fleuret                         ;;
;; Contact <francois@fleuret.org> for comments & bug reports             ;;
;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;

;; Is it me, or the slave mode of mplayer is ugly to parse ? Did I
;; miss something ?

(defcustom media/mplayer/args nil
  "List of arguments for mplayer."
  :type 'list
  :group 'media)

(defcustom media/mplayer/timing-request-period 0.25
  "Period for the timing requests in second(s). Larger values
load Emacs less. Nil means no timing."
  :type 'float
  :group 'media)

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;; It is impossible to tell mplayer to send information every time dt
;; or so, hence this mess with a timer to avoid overloading emacs with
;; the processing of the information

(defvar media/mplayer/timer nil
  "A timer to request the timing position.")

(defun media/mplayer/timing-request ()
  (if media/mplayer/process
      (unless media/mplayer/paused
        (media/mplayer/write "get_time_pos\n")
        )
    (media/mplayer/stop-timing-requests)
    ))

(defun media/mplayer/start-timing-requests ()
  (when media/mplayer/timing-request-period
    (media/mplayer/stop-timing-requests)
    (setq media/mplayer/timer
          (run-at-time nil
                       media/mplayer/timing-request-period
                       'media/mplayer/timing-request))
    )
  )

(defun media/mplayer/stop-timing-requests ()
  (when media/mplayer/timer
    (cancel-timer media/mplayer/timer)
    (setq media/mplayer/timer nil)
    ))

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(defun media/mplayer/filter-subfunctions (cmd param)
  ;;   (unless (string= cmd "A:")
  ;;   (message "cmd=%s param=%s" cmd param)
  ;;   )
  (eval
   (cdr
    (assoc cmd

           '(

             ;; ----------------------------------------

             ("ANS_LENGTH" .

              (setq media/song-duration
                    (string-to-number (substring param 1))))

             ;; ----------------------------------------

             ("ANS_TIME_POSITION" .

              (progn
                (setq media/song-current-time
                      (string-to-number (substring param 1)))

                (when (and media/duration-to-history
                           (< media/mplayer/cumulated-duration media/duration-to-history))

                  (when media/mplayer/last-current-time
                    (setq media/mplayer/cumulated-duration
                          (+ media/mplayer/cumulated-duration
                             (- media/song-current-time media/mplayer/last-current-time))))

                  (when (>= media/mplayer/cumulated-duration media/duration-to-history)
                    (media/put-in-history)
                    )

                  (setq media/mplayer/last-current-time media/song-current-time)
                  )


                )
              )

             ;; ----------------------------------------

             ("AUDIO:" .

              (progn
                ;; param = "44100 Hz, 2 ch, s16le, 128.0 kbit/9.07% (ratio: 16000->176400)"
                (when (string-match "^\\([0-9]+\\) Hz, \\([0-9]+\\) ch.* \\([0-9.]+\\) kbit"
                                    param)
                  (setq media/current-information
                        (list media/mplayer/url
                              (string-to-number (match-string 1 param))
                              (string-to-number (match-string 2 param))
                              (string-to-number (match-string 3 param))))
                  )
                (run-hooks 'media/play-hook)
                ))

             ;; ----------------------------------------

             ("Starting" .
              (media/mplayer/write "get_time_length\n"))

             ;; ----------------------------------------

             ("Cache fill:" .

              (when (string-match "(\\([0-9]+\\) bytes" param)
                (message "Caching stream (%dkb)"
                         (/ (string-to-number (match-string 1 param)) 1024))))

             ;; ----------------------------------------

             ("Exiting..." .

              (progn
                (setq media/mplayer/exit-type
                      (cdr (assoc param '(("(End of file)" . file-finished)
                                          ("(Quit)" . quit))))
                      media/current-information nil
                      media/song-duration nil
                      media/song-current-time nil)

                (when media/mplayer/process (kill-process media/mplayer/process))

                (force-mode-line-update)))

             ;; ----------------------------------------

             )
           ))))

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(defun media/mplayer/filter (process str)
  (setq media/mplayer/buffer (concat media/mplayer/buffer str))
  (let ((start 0))
    (while (and (< start (length media/mplayer/buffer))
                (string-match "\\(.*\\)[\n
]+" media/mplayer/buffer start))
      (setq start (1+ (match-end 1)))
      (let ((line (match-string 1 media/mplayer/buffer)))
        (when (string-match "^\\(AUDIO:\\|Exiting...\\|Starting\\|ANS_LENGTH\\|ANS_TIME_POSITION\\|Cache fill:\\) *\\(.*\\)$" line)
          (media/mplayer/filter-subfunctions (match-string 1 line) (match-string 2 line)))))
    (setq media/mplayer/buffer (substring media/mplayer/buffer start)))
  )

(defun media/mplayer/sentinel (process str) ()
  ;; (message "Media process got \"%s\"" (replace-regexp-in-string "\n" "" str))
  (unless (eq (process-status media/mplayer/process) 'run)
    (setq media/current-information nil
          media/mplayer/process nil
          media/song-current-time nil
          media/song-duration nil)

    (media/mplayer/stop-timing-requests)

    (if (eq media/mplayer/exit-type 'file-finished)
        (run-hooks 'media/finished-hook)
      (run-hooks 'media/error-hook))

    (force-mode-line-update))
  )

(defun media/mplayer/write (&rest l)
  ;;   (message "****** WROTE \"%s\"" (replace-regexp-in-string "\n" "[RETURN]" (apply 'format l)))
  (if media/mplayer/process (process-send-string media/mplayer/process (apply 'format l))
    (error "No mplayer process"))
  )

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;; Player control abstract layer ;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;

(defun media/api/init () "Called once when the media application starts"
  (setq media/player-id "MPlayer"
        media/mplayer/url nil
        media/mplayer/buffer "" ;; Used as read buffer
        media/mplayer/process nil
        media/mplayer/exit-type nil
        media/mplayer/paused nil
        media/song-duration nil
        media/song-current-time nil
        media/mplayer/cumulated-duration 0
        media/mplayer/last-current-time nil
        ))

(defun media/api/cleanup () "Called when killing the application's buffer"
  (when media/mplayer/process
    (delete-process media/mplayer/process)
    (media/mplayer/stop-timing-requests)
    (setq media/mplayer/process nil)))

(defun media/api/play (url) (interactive)
  (setq media/mplayer/url url)

  (when media/mplayer/process (kill-process media/mplayer/process))

  ;; (if media/mplayer/process
  ;; (media/mplayer/write (concat "loadfile "
  ;; (replace-regexp-in-string "^file://" "" media/mplayer/url)
  ;; "\n"))

  (setq media/mplayer/process
        (apply
         'start-process
         (append
          '("mplayer" nil "mplayer" "-slave" "-quiet")
          media/mplayer/args
          (if (string-match  "\\(asx\\|m3u\\|pls\\|ram\\)$" media/mplayer/url)
              (list "-playlist"))
          (list (replace-regexp-in-string "^file://" "" media/mplayer/url))))
        media/mplayer/exit-type 'unknown
        media/mplayer/paused nil
        media/song-duration nil
        media/song-current-time nil
        media/mplayer/cumulated-duration 0
        media/mplayer/last-current-time nil
        )

  (set-process-filter media/mplayer/process 'media/mplayer/filter)
  (set-process-sentinel media/mplayer/process 'media/mplayer/sentinel)
  (process-kill-without-query media/mplayer/process)
  (media/mplayer/start-timing-requests)
  (media/mplayer/write "get_time_pos\n")

  )

(defun media/api/stop () (interactive)
  (media/mplayer/write "quit\n")
  )

(defun media/api/pause () (interactive)
  (media/mplayer/write "pause\n")
  (setq media/mplayer/paused (not media/mplayer/paused))
  )

(defun media/api/set-volume (mode value) (interactive)
  (if (eq mode 'absolute)
      (media/mplayer/write "volume %s 1\n" value)
    (if (>= value 0)
        (media/mplayer/write "volume +%s\n" value)
      (media/mplayer/write "volume %s\n" value))))

(defun media/api/jump-at-percent (percent) (interactive)
  (setq media/song-current-time nil)
  (when (< media/mplayer/cumulated-duration media/duration-to-history)
    (setq media/mplayer/cumulated-duration 0
          media/mplayer/last-current-time nil))
  (media/mplayer/write "seek %s 1\n" percent)
  (media/mplayer/write "get_time_pos\n")
  )

(defun media/api/jump-at-time (mode time) (interactive)
  (setq media/song-current-time nil)
  (when (< media/mplayer/cumulated-duration media/duration-to-history)
    (setq media/mplayer/cumulated-duration 0
          media/mplayer/last-current-time nil))
  (if (eq mode 'absolute)
      (media/mplayer/write "seek %s 2\n" time)
    (media/mplayer/write "seek %s 0\n" time))
  (media/mplayer/write "get_time_pos\n")
  )

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