#!/bin/bash

# summary of how this script can be called:
#        * <prerm> `remove'
#        * <old-prerm> `upgrade' <new-version>
#        * <new-prerm> `failed-upgrade' <old-version>
#        * <conflictor's-prerm> `remove' `in-favour' <package> <new-version>
#        * <deconfigured's-prerm> `deconfigure' `in-favour'
#          <package-being-installed> <version> `removing'
#          <conflicting-package> <version>
# for details, see https://www.debian.org/doc/debian-policy/ or
# the debian-policy package

set -e # fail on any error

PROJECT=armaconsole

# SYSTEMCTL CONFIG
SYSCTL_AMC_SERVICES="amcgunicorn amccelery amccelerybeat amccorrelator amclicense amcchecker amcvector"

# ======[ Trap Errors ]======#
set -E                        # let shell functions inherit ERR trap
trap err_handler 1 2 3 15 ERR # Trap non-normal exit signals: 1/HUP, 2/INT, 3/QUIT, 15/TERM, ERR
# shellcheck disable=SC2128
function err_handler() {
  local exit_status=${1:-$?}
  logger -s -p "syslog.err" -t "${PROJECT}.deb" \
    "${PROJECT}.deb script '$0' error code $exit_status (line $BASH_LINENO: '$BASH_COMMAND')"
  exit "$exit_status"
}

. /usr/share/debconf/confmodule
if [ -f /usr/share/dbconfig-common/dpkg/prerm.pgsql ]; then
  . /usr/share/dbconfig-common/dpkg/prerm.pgsql
  dbc_go "${PROJECT}" "$@" || true
  db_stop
fi

DEBUG_INSTALL="${DEBUG_INSTALL:-0}"
[ "$DEBUG_INSTALL" == "1" ] && set -x
[ "$DEBUG_INSTALL" == "1" ] && echo "Calling prerm $*"

set -u # treat unset variables as errors
case "$1" in
remove)
  # shellcheck disable=SC2086
  systemctl stop $SYSCTL_AMC_SERVICES || true
  # shellcheck disable=SC2086
  systemctl disable $SYSCTL_AMC_SERVICES || true
  ;;
upgrade | deconfigure) ;;
failed-upgrade)
  exit 1
  ;;
*)
  echo "prerm called with unknown argument \`$1'" >&2
  exit 1
  ;;
esac
exit 0