# The UID and GID for the lightdm package in [community] is 620 (for whatever
# reason), so we'll keep that

post_install() {
  if ! getent group lightdm >/dev/null; then
    groupadd -g 620 lightdm
  fi

  if ! getent passwd lightdm >/dev/null; then
    useradd -u 620 -c "Light Display Manager" -g lightdm -d /var/lib/lightdm -s /sbin/nologin lightdm
  fi

  if ! getent group nopasswdlogin >/dev/null; then
    groupadd --system nopasswdlogin
  fi

  if [ ! -d /var/lib/lightdm ]; then
    mkdir -p /var/lib/lightdm
  fi

  chown -R lightdm:lightdm /var/lib/lightdm
  chmod -R 0750 /var/lib/lightdm

  systemd-tmpfiles --create /usr/lib/tmpfiles.d/lightdm.conf
}

post_upgrade() {
  if getent group lightdm >/dev/null; then
    if [ "x$(id -g lightdm 2>/dev/null)" != "x620" ]; then
      userdel lightdm &>/dev/null || :
      groupdel lightdm &>/dev/null || :
      groupadd -g 620 lightdm
    fi
  fi

  if ! getent passwd lightdm >/dev/null; then
    if [ "x$(id -u lightdm 2>/dev/null)" != "x620" ]; then
      userdel lightdm &>/dev/null || :
      useradd -u 620 -c "Light Display Manager" -g lightdm -d /var/lib/lightdm -s /sbin/nologin lightdm
    fi
  fi

  chown -R lightdm:lightdm /var/lib/lightdm
  chmod -R 0750 /var/lib/lightdm
}

post_remove() {
  rm -f /etc/lightdm.conf

  if [ -d /var/lib/lightdm ]; then
    rm -r /var/lib/lightdm
  fi

  if [ -d /var/log/lightdm ]; then
    rm -r /var/log/lightdm
  fi  

  if [ -d /var/cache/lightdm ]; then
    rm -r /var/cache/lightdm
  fi  

  if [ -d /var/run/lightdm/authority ]; then
    rm -r /var/run/lightdm/authority
  fi  

  if getent passwd lightdm >/dev/null; then
    userdel -r -f lightdm
  fi  
  if getent group lightdm >/dev/null; then
    groupdel lightdm
  fi
}