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post_install() {
  _reload_udev
  _enable_user_service
  _restart_for_active_users
  _post_msg
}

post_upgrade() {
  if systemctl list-unit-files 'lianli-daemon@*.service' 2>/dev/null | grep -q '\.service'; then
    cat <<MSG
NOTE: The templated system service lianli-daemon@USER.service has been removed.
Disabling any enabled instances:

MSG
    for inst in $(systemctl list-units --all --no-legend 'lianli-daemon@*.service' 2>/dev/null | awk '{print $1}'); do
      systemctl disable --now "$inst" 2>/dev/null || true
    done
    systemctl disable --now lianli-evdi-setup.service 2>/dev/null || true
  fi
  _reload_udev
  _enable_user_service
  _restart_for_active_users
  _post_msg
}

post_remove() {
  systemctl --global disable lianli-daemon.service 2>/dev/null || true
}

_reload_udev() {
  if command -v udevadm &>/dev/null; then
    udevadm control --reload-rules 2>/dev/null || true
    udevadm trigger 2>/dev/null || true
    # Module uevents live under /sys/module, which `udevadm trigger` skips by
    # default; trigger evdi explicitly so the chmod rule applies to an already-
    # loaded module without requiring reboot or rmmod+modprobe.
    [ -e /sys/module/evdi ] && udevadm trigger --action=add /sys/module/evdi 2>/dev/null || true
  fi
}

_enable_user_service() {
  systemctl --global enable lianli-daemon.service 2>/dev/null || true
}

_restart_for_active_users() {
  [ -d /run/user ] || return 0
  local dir uid user
  for dir in /run/user/*; do
    [ -d "$dir" ] || continue
    uid="${dir##*/}"
    [ -S "$dir/bus" ] || continue
    user="$(id -nu "$uid" 2>/dev/null)" || continue
    # runuser drops the caller's env; systemctl --user needs both XDG_RUNTIME_DIR
    # and DBUS_SESSION_BUS_ADDRESS to find the target user's manager.
    runuser -u "$user" -- \
      env XDG_RUNTIME_DIR="$dir" DBUS_SESSION_BUS_ADDRESS="unix:path=$dir/bus" \
      systemctl --user daemon-reload 2>/dev/null || true
    runuser -u "$user" -- \
      env XDG_RUNTIME_DIR="$dir" DBUS_SESSION_BUS_ADDRESS="unix:path=$dir/bus" \
      systemctl --user restart lianli-daemon.service 2>/dev/null || true
  done
}

_post_msg() {
  cat <<MSG
lianli-daemon.service has been enabled globally for all users — it will
auto-start on login for every account. Any user with an active session
during install has had the daemon (re)started automatically to pick up
the new binary.

Config: ~/.config/lianli/config.json (created on first run).

Desktop-mode devices (HydroShift II, Lancool 207, Universal Screen 8.8")
work out of the box — evdi auto-loads at boot and udev grants user access.
If this is a first install without a reboot, run: sudo modprobe evdi

Optional: to keep the daemon running without an active desktop login:
  sudo loginctl enable-linger \$USER

MSG
}