From 425dc38a6bb93de99bb3f743683591062ed0dac7 Mon Sep 17 00:00:00 2001
From: Colin Okay <colin@cicadas.surf>
Date: Wed, 26 Oct 2022 11:33:58 -0500
Subject: Add: playlist.lisp

---
 keyed.lisp    |   9 ++
 playlist.lisp | 266 +++++++++++++++++++++++++++++++++++++++++++++++
 vampire.asd   |   2 +
 vampire.lisp  | 326 +++++++---------------------------------------------------
 4 files changed, 312 insertions(+), 291 deletions(-)
 create mode 100644 keyed.lisp
 create mode 100644 playlist.lisp

diff --git a/keyed.lisp b/keyed.lisp
new file mode 100644
index 0000000..b38cfe3
--- /dev/null
+++ b/keyed.lisp
@@ -0,0 +1,9 @@
+;;;; keyed.lisp
+
+(in-package :vampire)
+
+(defclass/bknr keyed ()
+  ((key
+    :r :std (nuid)
+    :index-type string-unique-index
+    :index-reader object-with-key)))
diff --git a/playlist.lisp b/playlist.lisp
new file mode 100644
index 0000000..62f9b9e
--- /dev/null
+++ b/playlist.lisp
@@ -0,0 +1,266 @@
+;;;; playlist.lisp
+
+(in-package :vampire)
+
+;;; MODEL
+
+(defclass/bknr playlist (keyed)
+  ((title :with :std (default-name "playlist"))
+   (tracks editors :with :std (list))
+   (cover-image :with :std nil :doc "A url to the cover of this album.")
+   (user :with
+         :std (error "A USER is required to have created the content."))))
+
+(defmethod initialize-instance :after ((pl playlist) &key)
+  (pushnew pl (user-playlists (playlist-user pl)) :test #'eq))
+
+(defclass/bknr track (keyed)
+  ((source file title artist album thumb-url duration codec :with)
+   (playlists :with :std (list) :doc "A list of playlists in which this track appears")))
+
+;;; OPERATIONS
+
+(defun playlist-duration (pl)
+  (reduce #'+
+          (playlist-tracks pl)
+          :key 'track-duration 
+          :initial-value 0))
+
+(defun add-track (tr pl &optional (n -1))
+  (setf (playlist-tracks pl)
+        (insert-nth tr n (playlist-tracks pl))))
+
+(defun remove-nth-from-playlist (pl n)
+  (multiple-value-bind (newlist track)
+      (remove-nth n (playlist-tracks pl) t) 
+    (setf (playlist-tracks pl) newlist
+          (track-playlists track) (delete pl (track-playlists track)
+                                          :test #'eq :count 1))))
+;;; TRANSACTIONS
+
+(defun append-track (pl tr)
+  (with-transaction ()
+    (add-track tr pl)))
+
+(defun new-track (file trackinfo)
+  "Trackinfo is a plist containing information about the track to create."
+  (with-transaction ()
+    (let ((track (apply #'make-instance 'track trackinfo)))
+      (setf (track-file track) (namestring file))
+      track)))
+
+(defun new-playlist (user &key title)
+  (with-transaction ()
+    (make-instance 'playlist :title title :user user)))
+
+;;; CLIENT STATE 
+
+(defclass/std playlist-ctl ()
+  ((playlist :std nil :doc "The playlist instance.")
+   (tracks :std nil :doc "A list of instances of track/client")
+   (now-playing-track :std nil :doc "An instance of track-ctl")
+   (np-title np-artist np-thumb np-dur np-time np-play
+             :std nil :doc "Now Playing Elements")
+   (pl-title pl-tracks
+             :std nil :doc "Playlist Elements"))
+  (:documentation "Holds the complete state for this session's viewing of a particular playlist."))
+
+(defclass/std track-ctl ()
+  ((track audio container :std nil))
+  (:documentation "The state of a particular track in this session's viewing of a playlist."))
+
+(defun audio-for-track (ctl track)
+  "Return the audio element associated with the track"
+  (when-let (trctl (find track (tracks ctl) :test #'eq :key #'track))
+    (audio-elem trctl)))
+
+(defun track-for-audio (ctl audio)
+  "Return the track instance associated with the AUDIO element."
+  (when-let (trctl (find audio (tracks ctl) :test #'eq :key #'audio-elem))
+    (track trctl)))
+
+(defun track-ctl-with-audio (ctl audio)
+  (find audio (tracks ctl) :key #'audio-elem))
+
+(defun find-next-track (ctl &optional track)
+  "Return the TRACK-CTL instance that appeqars after TRACK in the
+  TRACKS list, or NIL.  If TRACK is NIL, return the first TRACK in the
+  list."
+  (if (null track)
+      (first (tracks ctl))
+      (when-let (pos (position track (tracks ctl)))
+        (nth (1+ pos) (tracks ctl)))))
+
+(defun find-previous-track (ctl &optional track)
+  (when-let (pos (position track (tracks ctl)))
+    (when (plusp pos)
+      (nth (1- pos) (tracks ctl)))))
+
+;;; CLIENT SESSION
+
+(defun install-new-playlist-ctl (playlist body)
+  (setf (connection-data-item body "playlist-ctl")
+        (make-instance 'playlist-ctl :playlist playlist)))
+
+(defun get-playlist-ctl (obj)
+  (connection-data-item obj "playlist-ctl"))
+
+;;; PLAYBACK CONTROL
+
+(defun start-playback (ctl)
+  (when-let (tr (now-playing-track ctl))
+    (play-media (audio tr))
+    (setf (text (np-play ctl)) "||")))
+
+(defun pause-playback (ctl)
+  (when-let (tr (now-playing-track ctl))
+    (pause-media (audio tr))
+    (setf (text (np-play ctl)) "|>")))
+
+(defun stop-playback (ctl)
+  (when-let (tr (now-playing-track ctl))
+    (pause-media (audio tr))
+    (setf (media-position (audio tr)) 0
+          (now-playing-track ctl) nil
+          (text (np-play ctl)) "|>")))
+
+
+;;; CLIENT CONTROL
+
+(defun load-track-display (ctl track-ctl)
+  (let ((tr (track track-ctl)))
+    (setf (text (np-title ctl)) (track-title tr)
+          (text (np-artist ctl)) (or (track-artist tr) "")
+          (url-src (np-thumb ctl)) (or (track-thumb-url tr) "")
+          (text (np-dur ctl)) (secs-to-hms (or (track-duration tr) 0))
+          (text (np-time ctl)) (secs-to-hms 0)
+          (text (np-play ctl)) "|>")))
+
+(defun toggle-now-playing (e)
+  (when-let (ctl (get-playlist-ctl e))
+    (if-let (np (now-playing-track ctl))
+      (if (pausedp (audio np))
+          (start-playback ctl)
+          (pause-playback ctl))
+      (advance-now-playing e))))
+
+(defun advance-now-playing (e)
+  (when-let* ((ctl
+               (get-playlist-ctl e))
+              (next
+               (find-next-track ctl (now-playing-track ctl))))
+    (stop-playback ctl)
+    (setf (now-playing-track ctl) next)
+    (load-track-display ctl next)
+    (start-playback ctl)))
+
+(defun previous-now-playing (e)
+  (when-let* ((ctl
+               (get-playlist-ctl e))
+              (prev
+               (find-previous-track ctl (now-playing-track ctl))))
+    (stop-playback ctl)
+    (setf (now-playing-track ctl) prev)
+    (load-track-display ctl prev)
+    (start-playback ctl)))
+
+(defun update-now-playing-time (e)
+  (when-let* ((ctl (get-playlist-ctl e))
+              (tr (now-playing-track ctl)))
+    (setf (text (np-time ctl))
+          (secs-to-hms
+           (media-position (audio tr))))))
+
+
+(defun play-this-audio (audio)
+  (when-let (ctl (get-playlist-ctl audio))
+    (let ((np (now-playing-track ctl)))
+      (unless (and np (eq audio (audio np)))
+        (let ((tr
+                (track-ctl-with-audio ctl audio)))
+          (stop-playback ctl)
+          (setf (now-playing-track ctl) tr)
+          (start-playback ctl)
+          (load-track-display ctl tr))))))
+
+
+;;; CLIENT UI
+
+(defun playlist-title-content (playlist)
+  (format nil "~a -- ~a"
+          (playlist-title playlist)
+          (secs-to-hms (playlist-duration playlist))))
+
+(defun create-track-display (parent ctl)
+  (with-clog-create parent
+      (div (:class "track-display")
+           (section (:h3 :content "Now Playing"))
+           (img (:bind thumb))
+           (p ()
+              (span (:bind title))
+              (span (:bind artist)))
+           (p ()
+              (span (:bind time))
+              (span (:content " / "))
+              (span (:bind dur)))
+           (button (:content "<<" :bind back))
+           (button (:content "|>" :bind play))
+           (button (:content ">>" :bind forward)))
+    (setf (np-title ctl) title
+          (np-artist ctl) artist
+          (np-thumb ctl) thumb
+          (np-dur ctl) dur
+          (np-time ctl) time
+          (np-play ctl) play) 
+    (set-on-click back 'previous-now-playing)
+    (set-on-click forward 'advance-now-playing)
+    (set-on-click play 'toggle-now-playing)))
+
+(defun create-track-list-item (list track ctl)
+  (with-clog-create list
+      (list-item (:bind container)
+                 (p ()
+                    (span (:content (track-listing-line track)))
+                    (span (:content " -- "))
+                    (span (:content (secs-to-hms (or (track-duration track) 0)))))
+                 (audio (:source (media-url-path track) :controls nil :bind audio)))
+    (setf (tracks ctl)
+          (insert-nth (make-instance 'track-ctl
+                                     :container container
+                                     :audio audio
+                                     :track track)
+                      -1
+                      (tracks ctl)))
+    (set-on-time-update audio 'update-now-playing-time)
+    (set-on-ended audio 'advance-now-playing)
+    (set-on-click container (alambda (play-this-audio audio)))))
+
+(defun create-track-listing (parent pl ctl)
+  (let ((ol (create-ordered-list parent)))
+    (setf (pl-tracks ctl) ol)
+    (dolist (track (playlist-tracks pl))
+      (create-track-list-item ol track ctl))))
+
+(defun create-new-track-form (parent pl ctl)
+  )
+
+
+(defun playlist-key-from-url (url)
+  (first (last (ppcre:split "/" (nth 4 (multiple-value-list (quri:parse-uri url)))))))
+
+(defun playlist-page (body)
+  (when-let* ((list-id
+               (playlist-key-from-url (url (location body))))
+              (pl
+               (object-with-key list-id)))
+    (let ((ctl
+            (install-new-playlist-ctl pl body)))
+      (with-clog-create body
+          (div ()
+               (section (:h2 :content (playlist-title-content pl) :bind title-elem))
+               (track-display (ctl))
+               (track-listing (pl ctl :bind tracks-elem))
+               ;(new-track-form (pl ctl))
+               )
+          (setf (pl-title ctl) title-elem
+                (pl-tracks ctl) tracks-elem)))))
diff --git a/vampire.asd b/vampire.asd
index b68f05a..6dc0aa3 100644
--- a/vampire.asd
+++ b/vampire.asd
@@ -17,4 +17,6 @@
                (:file "definition-macros")
                (:file "utilities")
                (:file "downloader")
+               (:file "keyed")
+               (:file "playlist")
                (:file "vampire")))
diff --git a/vampire.lisp b/vampire.lisp
index 57e474f..8ca4b79 100644
--- a/vampire.lisp
+++ b/vampire.lisp
@@ -19,25 +19,6 @@
 
 ;;; RESOURCE MODEL
 
-(defclass/bknr keyed ()
-  ((key
-    :r :std (nuid)
-    :index-type string-unique-index
-    :index-reader object-with-key)))
-
-(defclass/bknr playlist (keyed)
-  ((title :with :std (default-name "playlist"))
-   (tracks editors :with :std (list))
-   (cover-image :with :std nil :doc "A url to the cover of this album.")
-   (user :with
-         :std (error "A USER is required to have created the content."))))
-
-(defmethod initialize-instance :after ((pl playlist) &key)
-  (pushnew pl (user-playlists (playlist-user pl)) :test #'eq))
-
-(defclass/bknr track (keyed)
-  ((source file title artist album thumb-url duration codec :with)
-   (playlists :with :std (list) :doc "A list of playlists in which this track appears")))
 
 (defclass/bknr user (keyed)
   ((name :with :std "")
@@ -46,43 +27,18 @@
 
 ;;; RESOURCE ACCESS OPERATIONS 
 
-(defun playlist-duration (pl)
-  (reduce #'+
-          (playlist-tracks pl)
-          :key 'track-duration 
-          :initial-value 0))
-
-(defun add-track (tr pl &optional (n -1))
-  (setf (playlist-tracks pl)
-        (insert-nth tr n (playlist-tracks pl))))
-
-(defun remove-nth-from-playlist (pl n)
-  (multiple-value-bind (newlist track)
-      (remove-nth n (playlist-tracks pl) t) 
-    (setf (playlist-tracks pl) newlist
-          (track-playlists track) (delete pl (track-playlists track)
-                                          :test #'eq :count 1))))
 
 ;;; TRANSACTIONS
 
-(defun append-track (pl tr)
-  (with-transaction ()
-    (add-track tr pl)))
+
 
 (defun new-user (&key name)
   (with-transaction ()
     (make-instance 'user :name name)))
 
-(defun new-playlist (user &key title)
-  (with-transaction ()
-    (make-instance 'playlist :title title :user user)))
 
-(defun new-track (file trackinfo)
-  "Trackinfo is a plist containing information about the track to create."
-  (with-transaction ()
-    (let ((track (apply #'make-instance 'track trackinfo)))
-      (setf (track-file track) (namestring file))
-      track)))
+
+
 
 ;;; CLIENT
 
@@ -146,251 +102,39 @@
       (princ title out))))
 
 
-;;; PLAYLIST CONTROL
-
-(defclass/std playlist/ctl ()
-  ((playlist track-list track-display audio->track now-playing :std nil)))
-
-(defmethod (setf now-playing) :before (newval ctl)
-  (with-slots (now-playing) ctl
-    (when now-playing
-      (remove-class (parent-element now-playing) "now-playing")))
-  (when newval
-    (add-class (parent-element newval) "now-playing")))
-
-(defclass/std track-display ()
-  ((title-elem
-    thumb-elem
-    artist-elem
-    time-elem
-    duration-elem
-    play/pause-btn)))
-
-(defun get-audio-track (ctl audio)
-  (cdr (assoc audio (audio->track ctl))))
-
-(defun get-next-audio-track (ctl &optional audio)
-  (with-slots (audio->track) ctl
-   (if (null audio)
-       (first audio->track)
-       (let ((pos
-               (position audio audio->track :key #'car)))
-         (assert pos () "Audio element ~a not found in this playlist control." audio)
-         (nth (1+ pos) audio->track)))))
-
-(defun stop-playback (ctl)
-  (with-slots (now-playing) ctl
-    (when now-playing
-      (pause-media now-playing)
-      (setf (media-position now-playing) 0
-            now-playing nil
-            (text (play/pause-btn (track-display ctl))) "⏵"))))
-
-(defun pause-playback (ctl)
-  (when-let  (audio (now-playing ctl))
-    (pause-media audio)
-    (setf (text (play/pause-btn (track-display ctl))) "⏵")))
-
-(defun start-playback (ctl)
-  (when-let (audio (now-playing ctl))
-    (play-media audio)
-    (setf (text (play/pause-btn (track-display ctl)))
-          "⏸")))
-
-(defun load-track-display (ctl)
-  (when-let (track (get-audio-track ctl (now-playing ctl)))
-    (with-slots
-          (title-elem thumb-elem artist-elem
-           time-elem duration-elem)
-        (track-display ctl)
-      (with-slots (title artist thumb-url duration) track
-        (setf (text title-elem) title
-              (text duration-elem) (secs-to-hms duration)
-              (text time-elem) (secs-to-hms 0)
-              (url-src thumb-elem) thumb-url)))))
-
-(defun initialize-playlist/ctl (body)
-  (let ((ctl (playlist/ctl body)))
-    (setf now-playing (car (first (audio->track ctl))))
-    (load-track-display ctl)))
-
-(defun playlist/ctl (obj)
-  (connection-data-item obj "playlist/ctl"))
-
-(defun install-playlist/ctl (playlist obj)
-  (setf (connection-data-item obj "playlist/ctl")
-        (make-instance 'playlist/ctl :playlist playlist)))
-
-(defun install-track-list (list)
-  (let ((ctl (playlist/ctl list)))
-    (setf (track-list ctl) list)))
-
-(defun install-track-display (thumb title artist time dur play/pause)
-  (let ((ctl (playlist/ctl thumb)))
-    (setf (track-display ctl)
-          (make-instance 'track-display
-                         :duration-elem dur
-                         :time-elem time
-                         :artist-elem artist
-                         :thumb-elem thumb
-                         :title-elem title
-                         :play/pause-btn play/pause))))
-
-(defun install-audio-track (audio track &optional (position -1))
-  (when-let (ctl (playlist/ctl audio))
-    (setf (audio->track ctl)
-          (insert-nth (cons audio track) position (audio->track ctl)))))
-
-(defun ctl/now-playing (elem)
-  (when-let (ctl (playlist/ctl elem))
-    (now-playing ctl)))
-
-(defun ctl/pause (elem)
-  (when-let (ctl (playlist/ctl elem))
-    (pause-playback ctl)))
-
-(defun ctl/stop (elem)
-  (when-let (ctl (playlist/ctl elem))
-    (stop-playback ctl)))
-
-(defun ctl/play-audio (audio)
-  (when-let (ctl (playlist/ctl audio))
-    (unless (eq audio (now-playing ctl))
-      (stop-playback ctl)
-      (setf (now-playing ctl) audio)
-      (start-playback ctl)
-      (load-track-display ctl))))
-
-(defun ctl/toggle-play (elem)
-  (when-let (ctl (playlist/ctl elem))
-    (if (now-playing ctl)
-        (if (pausedp (now-playing ctl))
-            (start-playback ctl)
-            (pause-playback ctl))
-        (ctl/next-track elem))))
-
-(defun ctl/next-track (elem)
-  (when-let (ctl (playlist/ctl elem))
-    (let ((next
-            (get-next-audio-track ctl (now-playing ctl))))
-      (stop-playback ctl)
-      (when next
-        (setf (now-playing ctl) (car next))
-        (start-playback ctl)
-        (load-track-display ctl)))))
-
-(defun ctl/update-playback-time (audio)
-  (when-let (ctl (playlist/ctl audio))
-    (setf (text (time-elem (track-display ctl)))
-          (secs-to-hms (media-position audio)))))
-
-(defun create-track-list-item (parent track)
-  (with-clog-create parent
-      (div (:bind view)
-           (p ()
-              (span (:content (track-listing-line track)))
-              (span (:content " -- "))
-              (span (:content (secs-to-hms (or (track-duration track) 0)))))
-           (audio (:source (media-url-path track) :controls nil :bind audio)))
-    (install-audio-track audio track)
-    (set-on-time-update 
-     audio
-     'ctl/update-playback-time)
-    (set-on-ended
-     audio
-     (alambda (ctl/next-track audio)))
-    (set-on-click
-     view
-     (alambda
-         (ctl/play-audio audio)))))
+;; (defun create-track-form (parent playlist &rest args)
+;;   (declare (ignorable args))
+;;   (with-clog-create parent
+;;       (div ()
+;;            (section (:h3 :content "Add Track"))
+;;            (label (:content "Paste URL: " :bind url-label))
+;;            (form-element (:text :bind url-input))
+;;            (button (:content "Fetch Track" :bind submit-button))
+;;            (div (:bind notice-area)))
+;;     (label-for url-label url-input)
+;;     (setf (place-holder url-input) "https://www.youtube.com/watch?v=dQw4w9WgXcQ")
+;;     (set-on-click
+;;      submit-button
+;;      (alambda
+;;          (let* ((url
+;;                   (value url-input))
+;;                 (notice
+;;                   (create-p notice-area :content (format nil "... Fetching ~a" url))))
+;;            (setf (value url-input) "")
+;;            (add-fetch-track-job
+;;             url
+;;             (lambda (track)
+;;               (remove-from-dom notice)
+;;               (append-track playlist track)
+;;               (add-track-to-listing parent track))
+;;             (lambda (err)
+;;               (remove-from-dom notice)
+;;               (format t "Error: ~a~%" err)
+;;               (alert (window (connection-body parent))
+;;                      (format nil "Error while fetching track at: ~a~%"
+;;                              url)))))))))
+
 
-(defun create-track-listing (parent playlist &rest args)
-  (declare (ignorable args))
-  (let ((list (create-ordered-list parent))) 
-    (install-track-list list)
-    (dolist (track (playlist-tracks playlist))
-      (with-clog-create list
-          (list-item () 
-                     (track-list-item (track)))))))
-
-(defun add-track-to-listing (elem track)
-  (with-slots (track-list) (playlist/ctl elem)
-    (with-clog-create track-list
-        (list-item ()
-                   (track-list-item (track))))))
-
-(defun create-track-form (parent playlist &rest args)
-  (declare (ignorable args))
-  (with-clog-create parent
-      (div ()
-           (section (:h3 :content "Add Track"))
-           (label (:content "Paste URL: " :bind url-label))
-           (form-element (:text :bind url-input))
-           (button (:content "Fetch Track" :bind submit-button))
-           (div (:bind notice-area)))
-    (label-for url-label url-input)
-    (setf (place-holder url-input) "https://www.youtube.com/watch?v=dQw4w9WgXcQ")
-    (set-on-click
-     submit-button
-     (alambda
-         (let* ((url
-                  (value url-input))
-                (notice
-                  (create-p notice-area :content (format nil "... Fetching ~a" url))))
-           (setf (value url-input) "")
-           (add-fetch-track-job
-            url
-            (lambda (track)
-              (remove-from-dom notice)
-              (append-track playlist track)
-              (add-track-to-listing parent track))
-            (lambda (err)
-              (remove-from-dom notice)
-              (format t "Error: ~a~%" err)
-              (alert (window (connection-body parent))
-                     (format nil "Error while fetching track at: ~a~%"
-                             url)))))))))
-
-(defun playlist-key-from-url (url)
-  (first (last (ppcre:split "/" (nth 4 (multiple-value-list (quri:parse-uri url)))))))
-
-(defun create-track-display (obj)
-  (with-clog-create obj
-      (div ()
-           (section (:h3 :content "Now Playing"))
-           (img (:bind thumb-elem))
-           (p (:bind title-elem))
-           (p (:bind artist-elem :hidden t))
-           (p ()
-              (span (:bind time-elem))
-              (span (:content "/"))
-              (span (:bind duration-elem)))
-           (button (:bind stop-button :content "⏹"))
-           (button (:bind next-button :content "⏭"))
-           (button (:bind pause/play-button :content "⏵")))
-    (setf (height thumb-elem) 120)
-    (set-on-click stop-button 'ctl/stop)
-    (set-on-click next-button 'ctl/next-track)
-    (set-on-click
-     pause/play-button
-     #'ctl/toggle-play)
-    (install-track-display thumb-elem title-elem artist-elem time-elem duration-elem
-                           pause/play-button)))
-
-(defun playlist-page (body)
-  (when-let* ((listid
-               (playlist-key-from-url (url (location body))))
-              (playlist
-               (object-with-key listid)))
-    (install-playlist/ctl playlist body)
-    (with-clog-create body
-        (div ()
-             (section (:h2 :content (format nil "~a -- ~a"
-                                            (playlist-title playlist)
-                                            (secs-to-hms (playlist-duration playlist)))))
-             (track-display ())
-             (div () (track-listing (playlist)))
-             (track-form (playlist))))))
 
 (defun user-page (body)
   (if-let (user (session-user body)) 
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