#!/usr/bin/env bash
# rice-session - start everything the desktop needs, exactly once.
#
#   rice-session start     called by bspwmrc (safe to call again on bspwm restart)
#   rice-session restart   stop and start the rice daemons
#
# Output goes to ~/.local/state/rice/session.log.
set -u

state="${XDG_STATE_HOME:-$HOME/.local/state}/rice"
theme="$state/theme"
mkdir -p "$state"
exec >>"$state/session.log" 2>&1

running() { pgrep -u "$UID" -x "$1" >/dev/null; }

# start <process-name> <command...>: launch detached unless already running
launch() {
  local name="$1"; shift
  if running "$name"; then return 0; fi
  command -v "$1" >/dev/null || { echo "missing: $1"; return 0; }
  setsid -f "$@" >/dev/null 2>&1 && echo "started $name"
}

daemons=(xsettingsd picom sxhkd dunst greenclip flameshot eww polybar xidlehook xss-lock)

start() {
  echo "== $(date -Is) session start"
  systemctl --user import-environment DISPLAY XAUTHORITY XDG_CURRENT_DESKTOP PATH QT_QPA_PLATFORMTHEME GTK_THEME
  dbus-update-activation-environment --systemd DISPLAY XAUTHORITY XDG_CURRENT_DESKTOP

  [[ -d $theme ]] || rice-theme render
  [[ -f $theme/Xresources ]] && xrdb -merge "$theme/Xresources"

  # Daemons left over from another setup keep their old config files, so a
  # bspwm restart alone would never switch them. Replace those.
  local pid args
  for pid in $(pgrep -u "$UID" -x sxhkd); do
    args=$(tr '\0' ' ' < "/proc/$pid/cmdline" 2>/dev/null)
    if [[ $args == *" -c "* && $args != *panel-keys* ]]; then kill "$pid" && echo "replaced: $args"; fi
  done
  for pid in $(pgrep -u "$UID" -x picom); do
    args=$(tr '\0' ' ' < "/proc/$pid/cmdline" 2>/dev/null)
    if [[ $args != *"$HOME/.config/picom/picom.conf"* ]]; then kill "$pid" && echo "replaced: $args"; fi
  done
  for _ in {1..20}; do
    pgrep -u "$UID" -f 'sxhkd -c .*bspwm|picom --config .*bspwm' >/dev/null || break
    sleep 0.1
  done
  pgrep -u "$UID" -x dunst >/dev/null && dunstctl reload

  launch xsettingsd xsettingsd -c "$theme/xsettingsd.conf"
  launch picom      picom --config "$HOME/.config/picom/picom.conf"
  launch sxhkd      sxhkd
  launch dunst      dunst
  launch greenclip  greenclip daemon
  launch flameshot  flameshot
  launch eww        eww daemon

  if ! pgrep -u "$UID" -f polkit-gnome-authentication-agent-1 >/dev/null; then
    setsid -f /usr/lib/polkit-gnome/polkit-gnome-authentication-agent-1 >/dev/null 2>&1
  fi

  rice-wallpaper restore
  rice-bar start
  rice-idle start

  (sleep 2 && rice-hook post-boot) &
}

stop() {
  echo "== $(date -Is) session stop"
  for d in "${daemons[@]}"; do pkill -u "$UID" -x "$d"; done
}

case "${1:-start}" in
  start)   start ;;
  stop)    stop ;;
  restart) stop; sleep 0.5; start ;;
  *) echo "usage: rice-session start|stop|restart" >&2; exit 2 ;;
esac