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+;;; emms-score.el --- Scoring system for mp3player
+
+;; Copyright (C) 2003, 2004, 2005, 2006, 2007, 2008,
+;;   2009, 2018 Free Software Foundation, Inc.
+
+;; Authors: Jean-Philippe Theberge <jphiltheberge@videotron.ca>,
+;;          Yoni Rabkin <yrk@gnu.org>
+;;
+;; Keywords: emms, mp3, mpeg, multimedia
+
+;; This file is part of EMMS.
+
+;; EMMS 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.
+;;
+;; EMMS 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 EMMS; see the file COPYING.  If not, write to the
+;; Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
+;; Boston, MA 02110-1301, USA.
+
+;;; Commentary:
+
+;; NOTE: This is experimental stuff - comments welcome!  There
+;; shouldn't worky anything in that file... scores aren't saved, they
+;; even don't have any consequence on playing order and there's just
+;; one mood in the moment. But it's a beginning and you can score down
+;; or up tracks... :)
+;;
+;; * How to use scoring in emms
+;;
+;; When you load emms, you are set to a default mood
+;; 'emms-default-mood' A mood is a one word string describing how
+;; you feel (like "funny", "tired", "aggresive"...)  Each mood have is
+;; own set of scoring rules.
+;;
+;; You can change your mood with M-x emms-score-change-mood.
+;;
+;; Every music file start with a default score of 0 the command
+;; emms-score-up-playing and emms-score-down-playing modify the
+;; score of the file you are curently listening by 1 In addition,
+;; skipping a file (with emms-skip) automaticaly score the file
+;; down.
+;;
+;; With scoring on (this mean the variable emms-use-scoring is t),
+;; emms will compare the score of the file with your tolerance to
+;; decide if it is played or not.
+;;
+;; The default tolerance level is 0 (or the variable
+;; emms-score-min-score).  This mean files with a score of 0 or more will
+;; be played and files with a score of -1 or less will be skipped.
+;;
+;; You can change the tolerance (by 1) with M-x
+;; emms-score-lower-tolerance and M-x
+;; emms-score-be-more-tolerant
+
+;;; Code:
+
+(require 'emms)
+
+(defvar emms-scores-list nil)
+(defvar emms-score-current-mood 'default)
+(defvar emms-score-min-score 0)
+(defvar emms-score-default-score 0)
+(defvar emms-score-hash (make-hash-table :test 'equal))
+(defvar emms-score-enabled-p nil
+  "If non-nil, emms score is active.")
+
+(defcustom emms-score-file (concat (file-name-as-directory emms-directory) "scores")
+  "*Directory to store the score file."
+  :type 'directory
+  :group 'emms)
+
+
+;;; User Interfaces
+
+(defun emms-score (arg)
+  "Turn on emms-score if prefix argument ARG is a positive integer,
+off otherwise."
+  (interactive "p")
+  (if (and arg (> arg 0))
+      (progn
+	(setq emms-score-enabled-p t)
+	(emms-score-load-hash)
+	(setq emms-ok-track-function 'emms-score-ok-track-function)
+        (unless noninteractive
+          (add-hook 'kill-emacs-hook 'emms-score-save-hash)))
+    (setq emms-score-enabled-p nil)
+    (emms-score-save-hash)
+    (setq emms-ok-track-function 'emms-default-ok-track-function)
+    (remove-hook 'kill-emacs-hook 'emms-score-save-hash)))
+
+;;;###autoload
+(defun emms-score-enable ()
+  "Turn on emms-score."
+  (interactive)
+  (emms-score 1)
+  (message "emms score enabled"))
+
+;;;###autoload
+(defun emms-score-disable ()
+  "Turn off emms-score."
+  (interactive)
+  (emms-score -1)
+  (message "emms score disabled"))
+
+;;;###autoload
+(defun emms-score-toggle ()
+  "Toggle emms-score."
+  (interactive)
+  (if emms-score-enabled-p
+      (emms-score-disable)
+    (emms-score-enable)))
+
+(defun emms-score-change-mood (mood)
+  "Change the current MOOD.
+The score hash is automatically saved."
+  (interactive "sMood: ")
+  (emms-score-save-hash)
+  (setq emms-score-current-mood (intern (downcase mood))))
+
+(defun emms-score-up-playing ()
+  (interactive)
+  (if emms-player-playing-p
+      (emms-score-change-score 1 (emms-score-current-selected-track-filename))
+    (error "No track currently playing")))
+
+(defun emms-score-down-playing ()
+  (interactive)
+  (if emms-player-playing-p
+      (emms-score-change-score -1 (emms-score-current-selected-track-filename))
+    (error "No track currently playing")))
+
+(defun emms-score-up-file-on-line ()
+  (interactive)
+  (emms-score-change-score 1 (emms-score-track-at-filename)))
+
+(defun emms-score-down-file-on-line ()
+  (interactive)
+  (emms-score-change-score -1 (emms-score-track-at-filename)))
+
+(defun emms-score-less-tolerant ()
+  "Only play mp3 with a higher score"
+  (interactive)
+  (setq emms-score-min-score (+ emms-score-min-score 1))
+  (message "Will play songs with a score >= %d" emms-score-min-score))
+
+(defun emms-score-more-tolerant ()
+  "Allow playing of mp3 with a lower score."
+  (interactive)
+  (setq emms-score-min-score (- emms-score-min-score 1))
+  (message "Will play songs with a score >= %d" emms-score-min-score))
+
+(defun emms-score-set-playing (score)
+  "Set score for current playing track."
+  (interactive "nSet score for playing track: ")
+  (let ((filename (emms-score-current-selected-track-filename)))
+    (if emms-player-playing-p
+	(emms-score-change-score
+	 (- score (emms-score-get-score filename))
+	 filename)
+      (error "No track currently playing"))))
+
+(defun emms-score-set-file-on-line (score)
+  "Set score for track at point in emms-playlist buffer."
+  (interactive "nSet score for track at point: ")
+  (let ((filename (emms-score-track-at-filename)))
+    (if emms-player-playing-p
+	(emms-score-change-score
+	 (- score (emms-score-get-score filename))
+	 filename))))
+
+(defun emms-score-set-tolerance (tolerance)
+  "Allow playing tracks with a score >= tolerance."
+  (interactive "nSet tolerance: ")
+  (setq emms-score-min-score tolerance)
+  (message "Will play songs with a score >= %d" emms-score-min-score))
+
+(defun emms-score-show-playing ()
+  "Show score for current playing track in minibuf."
+  (interactive)
+  (message "track/tolerance score: %d/%d"
+	   (emms-score-get-score
+	    (emms-score-current-selected-track-filename))
+	   emms-score-min-score))
+
+(defun emms-score-show-file-on-line ()
+  "Show score for track at point in emms-playlist buffer."
+  (interactive)
+  (message "track/tolerance score: %d/%d"
+	   (emms-score-get-score
+            (emms-score-track-at-filename))
+	   emms-score-min-score))
+
+
+;;; Internal Functions
+
+(defun emms-score-current-selected-track-filename ()
+  "Return filename of current selected track."
+  (emms-track-get (emms-playlist-current-selected-track) 'name))
+
+(defun emms-score-track-at-filename ()
+  "Return file of track at point in emms-playlist buffer."
+  (emms-track-get (emms-playlist-track-at) 'name))
+
+(defun emms-score-ok-track-function (track)
+  "Decide if to skip or play TRACK."
+  (emms-score-check-score (emms-track-get track 'name)))
+
+(defun emms-score-save-hash ()
+  "Save score hash in `emms-score-file'."
+  (interactive)
+  (unless (file-directory-p (file-name-directory emms-score-file))
+    (make-directory (file-name-directory emms-score-file)))
+  (with-temp-file emms-score-file
+    (let ((standard-output (current-buffer)))
+      (insert "(")
+      (maphash (lambda (key value)
+		 (prin1 (cons key value)))
+	       emms-score-hash)
+      (insert ")"))))
+
+(defun emms-score-load-hash ()
+  "Load score hash from `emms-score-file'."
+  (interactive)
+  (if (file-exists-p emms-score-file)
+      (let ((score-string (with-temp-buffer
+			    (emms-insert-file-contents emms-score-file)
+			    (buffer-string))))
+	(if (> (length score-string) 0)
+	    (mapc (lambda (elt)
+		    (puthash (car elt) (cdr elt) emms-score-hash))
+		  (read score-string)))
+	;; when file not exists, make empty but valid score file
+	(emms-score-save-hash))))
+
+(defun emms-score-get-plist (filename)
+  (gethash filename emms-score-hash))
+
+(defun emms-score-change-score (score filename)
+  (let ((sp (emms-score-get-plist filename) )
+	(sc (emms-score-get-score filename)))
+    (puthash filename
+	     (plist-put sp emms-score-current-mood (+ sc score))
+	     emms-score-hash)
+    (message "New score is %s" (+ score sc))))
+
+(defun emms-score-create-entry (filename)
+  (puthash filename
+	   `(,emms-score-current-mood ,emms-score-default-score)
+	   emms-score-hash))
+
+(defun emms-score-get-score (filename)
+  "Return score of TRACK."
+  (let ((plist (emms-score-get-plist filename)))
+    (if (member emms-score-current-mood plist)
+	(plist-get plist emms-score-current-mood)
+      (emms-score-create-entry filename)
+      (emms-score-get-score filename))))
+
+(defun emms-score-check-score (filename)
+  (>= (emms-score-get-score filename) emms-score-min-score))
+
+(provide 'emms-score)
+
+;;; emms-scores.el ends here