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+;;;; model.lisp
+
+(in-package :vampire)
+
+(defclass/bknr keyed ()
+  ((key
+    :r :std (nuid)
+       :index-type string-unique-index
+       :index-reader object-with-key)))
+
+(defclass/bknr user (keyed)
+  ((name :with :std "")
+   (playlists :with :std (list))
+   (pw pwhash :with)))
+
+(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")))
+
+
+;;; MODEL OPERATIONS
+
+(defun user-with-key (key)
+  (when-let (obj (object-with-key key))
+    (when (typep obj 'user)
+      obj)))
+
+(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))))
+
+(defun track-with-source (source)
+  (find source (store-objects-with-class 'track) :test #'string-equal :key 'track-source))
+
+;;; TRANSACTIONS
+
+(defun new-user (&key name)
+  (with-transaction ()
+    (make-instance 'user :name name)))
+
+(defun append-track (pl tr)
+  (with-transaction ()
+    (add-track tr pl)))
+
+(defun delete-track-at (pl pos)
+  (when-let (tr (nth pos (playlist-tracks pl)))
+    (with-transaction ()
+      (setf (playlist-tracks pl)
+            (delete tr (playlist-tracks pl)))
+      t)))
+
+(defun swap-tracks (pl n m)
+  (unless (or (minusp (min m n))
+              (>= (max m n) (length (playlist-tracks pl)) ))
+    (with-transaction ()
+      (setf (playlist-tracks pl)
+            (nswap (playlist-tracks pl) n m)))))
+
+(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)))
+
+(defun update-playlist-title (playlist title)
+  (with-transaction ()
+    (setf (playlist-title playlist) title)))