#!/usr/bin/env bash

set -euo pipefail

SYSTEMD_RUN="${SYSTEMD_RUN:-/usr/bin/systemd-run}"
SYSTEMCTL_BIN="${SYSTEMCTL_BIN:-/usr/bin/systemctl}"
UNIT_SUFFIX="$(date +%s)-$$"

if [[ "${EUID}" -ne 0 ]]; then
  echo "control-system.sh skal koeres som root." >&2
  exit 1
fi

if [[ ! -x "$SYSTEMD_RUN" ]]; then
  echo "systemd-run blev ikke fundet." >&2
  exit 1
fi

if [[ ! -x "$SYSTEMCTL_BIN" ]]; then
  echo "systemctl blev ikke fundet." >&2
  exit 1
fi

case "${1:-}" in
  restart-service)
    exec "$SYSTEMD_RUN" \
      --quiet \
      --collect \
      --unit "tuxdmx-restart-service-$UNIT_SUFFIX" \
      --description "Genstart TuxDMX service" \
      /bin/sh -lc "sleep 2 && '$SYSTEMCTL_BIN' restart tuxdmx.service"
    ;;
  reboot-host)
    exec "$SYSTEMD_RUN" \
      --quiet \
      --collect \
      --unit "tuxdmx-reboot-host-$UNIT_SUFFIX" \
      --description "Genstart TuxDMX host" \
      /bin/sh -lc "sleep 2 && '$SYSTEMCTL_BIN' reboot"
    ;;
  *)
    echo "Brug: $0 {restart-service|reboot-host}" >&2
    exit 2
    ;;
esac