;; Now-playing widget for the thin client. Installed to
;; /home/<KIOSK_USERNAME>/.config/eww/eww.yuck by build-thin-client-iso.sh.
;;
;; Data source: /usr/local/bin/now-playing-json, a separate `playerctl --follow`
;; process, NOT thinclient_agent's MprisBridge. The agent is a *system* service that
;; deliberately outlives the compositor, whereas this widget is session-scoped and dies
;; with sway; wiring the widget to the agent would mean either restarting the agent
;; whenever the widget restarts, or opening a second inbound control channel into it,
;; which the security boundary in mqtt_discovery.py rules out. The cost is one extra
;; playerctl subscription, which is negligible.
;;
;; The :onclick strings below are fixed constants in this file. Nothing from MQTT, HA,
;; or player metadata is ever interpolated into them.

(defvar players "mpv,spotifyd,%any")

(deflisten nowplaying
  :initial '{"visible":false,"title":"","artist":"","art":"","controls":false}'
  "/usr/local/bin/now-playing-json")

(defwidget np-meta []
  (box :orientation "vertical" :space-evenly false :halign "start" :valign "center" :hexpand true
    (label :class "np-title"  :text nowplaying.title  :halign "start" :limit-width 34 :truncate true)
    (label :class "np-artist" :text nowplaying.artist :halign "start" :limit-width 34 :truncate true)))

;; Hidden rather than absent when the player exposes no transport control (some
;; sources only report metadata) — the widget then degrades to art + text.
(defwidget np-controls []
  (box :class "np-controls" :orientation "horizontal" :space-evenly true :spacing 4
       :visible {nowplaying.controls} :valign "center"
    (button :class "np-btn" :onclick "playerctl -p ${players} previous"   "⏮")
    (button :class "np-btn" :onclick "playerctl -p ${players} play-pause" "⏯")
    (button :class "np-btn" :onclick "playerctl -p ${players} next"       "⏭")))

(defwidget np-root []
  (box :class "np-root" :orientation "horizontal" :space-evenly false :spacing 12
       :visible {nowplaying.visible}
    (image :class "np-art" :path nowplaying.art :image-width 72 :image-height 72)
    (np-meta)
    (np-controls)))

;; :exclusive false — the widget floats over whatever is on screen and must never
;; reserve layer-shell space, or it would shrink the fullscreen media surfaces this
;; whole image exists to show. Visibility is owned by fullscreen-watcher.sh, which
;; opens and closes this window; the :visible binding above only handles "nothing is
;; playing at all".
(defwindow now-playing
  :monitor 0
  :geometry (geometry :x "24px" :y "24px" :anchor "bottom left"
                      :width "420px" :height "96px")
  :stacking "overlay"
  :exclusive false
  :focusable false
  (np-root))