;;;; vampire.lisp

(in-package #:vampire)

;;; SYSTEM CONFIG COMPONENT

(defvar *config* nil)

(defclass/std config ()
  ((datastore-directory :ir :std #P"/srv/parasite/store/")
   (static-directory :ir :std #P"/srv/parasite/static/")
   (port :ir :std 4919)
   (downloader-threads :ir :std 5)))

(defun config-from-file (path)
  "PATH should be a path to a file containing a PLIST suitable for
   passing as the keyword arguments to (MAKE-INSTANCE 'CONFIG ...)"
  (apply #'make-instance 'config (read-from-file path)))

;;; 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 "")
   (playlists :with :std (list))
   (pw pwhash :with)))

;;; 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

(defparameter +user-key+ "vampire.userkey")

(defun user-key (window)
  (jonathan:parse (storage-element window :local +user-key+)))

(defun (setf user-key) (val window)
  (setf (storage-element window :local +user-key+) (jonathan:to-json val)))

(defun session-user (clog-obj)
  (object-with-key (user-key (window (connection-body clog-obj)))))

(defun create-new-playlist-form (parent &rest args)
  (declare (ignorable args))
  (with-clog-create parent
      (div ()
           (section (:h2 :content "Create New Playlist"))
           (label (:content "Playlist Title:"))
           (form-element (:text :bind pl-title))
           (button (:content "Create" :bind btn)))
    (set-on-click
     btn
     (alambda
       (new-playlist (session-user parent) :title (value pl-title))
       (reload (location (connection-body parent)))))))

(defun url-to-playlist (pl location)
  (format nil "~a//~a/playlist?list=~a"
          (protocol location)
          (host location)
          (key pl)))

(defun create-playlist-listing (parent &rest args)
  (declare (ignorable args))
  (dolist (pl (user-playlists (session-user parent)))
    (let ((url
            (url-to-playlist pl (location (connection-body parent)))))
      (with-clog-create parent
          (div ()
               (section (:h4)
                        (a (:link url :content (playlist-title pl) :bind pl-link))))
        (set-on-click
         pl-link
         (alambda
           (setf (url (location (connection-body parent)))
                 url)))))))

(defun media-url-path (track)
  (format nil "/media/~a.~a"
          (pathname-name (track-file track))
          (pathname-type (track-file track))))

(create-audio )

(defun create-track-listing (parent playlist &rest args)
  (declare (ignorable args))
  (dolist (track (playlist-tracks playlist))
    (with-clog-create parent
        (div (:bind view)
             (section (:h4 :content (track-title track)))
             (img (:bind thumb))
             (audio (:source (media-url-path track) :controls nil :bind audio)))
      (set-on-click
       view
       (alambda
           (play-media audio)))
      (if (track-thumb-url track)
        (setf (url-src thumb) (track-thumb-url track)
              (height thumb) "100px")))))

(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)
              (append-track playlist track)
              (reload (location (connection-body parent))))
            (lambda (err)
              (remove-from-dom notice)
              (format t "Error: ~a~%" err)
              (alert (window (connection-body parent))
                     (format nil "Error whiel fetching track at: ~a~%"
                             url)))))))))

(defun playlist-page (body)
  (when-let* ((listid
               (form-data-item (form-get-data body) "list"))
              (playlist
               (object-with-key listid)))
    (with-clog-create body
        (div ()
             (section (:h2 :content (playlist-title playlist)))
             (div ()
                  (track-listing (playlist)))
             (track-form (playlist))))))

(defun user-page (body)
  (if-let (user (session-user body)) 
    (with-clog-create body
        (div ()
             (p (:content (format nil "Welcome ~a" (user-name user))))
             (new-playlist-form ())
             (playlist-listing ())))
    (setf (url (location body)) "/")))

(defun login-page (body)
  (with-clog-create body
      (div ()
           (p (:content "LOGIN"))
           (form-element (:text :bind name))
           (button (:bind btn :content "Click here to log in")))
    (set-on-click
     btn
     (lambda (obj)
       (declare (ignore obj))
       (let ((u (new-user :name (value name))))
         (setf (user-key (window body)) (key u))
         (setf (url (location body)) "/"))))))

(defun main (body)
  (if (session-user body)
      (setf (url (location body)) "/user")
      (setf (url (location body)) "/login")))

;;; STARTUP

(defun initialize-database (config)
  (ensure-directories-exist (datastore-directory config))
  (make-instance
   'bknr.datastore:mp-store
   :directory (datastore-directory config)
   :subsystems (list (make-instance 'bknr.datastore:store-object-subsystem))))

(defun start (config)
  (setf *config* config)
  (initialize-database config )
  (start-downloader-service config)
  (initialize 'main
              :extended-routing t
              :static-root (static-directory config))
  (set-on-new-window 'user-page :path "/user")
  (set-on-new-window 'login-page :path "/login")
  (set-on-new-window 'playlist-page :path "/playlist")
  (open-browser))

(defun hacking-start ()
  (start (make-instance
          'config
          :static-directory (merge-pathnames "vampire-static/" (user-homedir-pathname))
          :datastore-directory (merge-pathnames "vampire-store/" (user-homedir-pathname)))))