#!/bin/bash

# summary of how this script can be called:
#        * <postrm> `remove'
#        * <postrm> `purge'
#        * <old-postrm> `upgrade' <new-version>
#        * <new-postrm> `failed-upgrade' <old-version>
#        * <new-postrm> `abort-install'
#        * <new-postrm> `abort-install' <old-version>
#        * <new-postrm> `abort-upgrade' <old-version>
#        * <disappearer's-postrm> `disappear' <overwriter>
#          <overwriter-version>
# for details, see https://www.debian.org/doc/debian-policy/ or
# the debian-policy package

set -e # fail on any error

PROJECT=armaconsole

# USERS CONFIG
PROJECT_USER="${PROJECT}"
SUDOERS_FILE_PATH="/etc/sudoers.d/${PROJECT}"

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

# AMC DIRS
AMC_ETC="/etc/${PROJECT}"
AMC_HOME="/usr/local/${PROJECT}"
AMC_WWW="/var/www/${PROJECT}"
AMC_LOG="/var/log/${PROJECT}"
AMC_PUBLIC="${AMC_WWW}/public"

# CERTS PATHES
NGINX_SSL_PATH="/etc/nginx/ssl/${PROJECT}"

# ======[ 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"
}

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

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

function restore_config() {
  fpath="$1"
  if [ -f "${fpath}.AMCBK" ]; then
    rm -f "${fpath}"
    mv "${fpath}.AMCBK" "${fpath}"
  fi
}

set -u # treat unset variables as errors
case "$1" in
disappear)
  exit 1
  ;;
remove | upgrade | abort-install | abort-upgrade | failed-upgrade)

  # shellcheck disable=SC2086
  systemctl stop $SYSCTL_AMC_SERVICES &>/dev/null || true
  # shellcheck disable=SC2086
  systemctl disable $SYSCTL_AMC_SERVICES &>/dev/null || true

  # Nginx
  rm -f "/etc/nginx/sites-enabled/${PROJECT}*" &>/dev/null
  rm -rf "${NGINX_SSL_PATH}"

  # Elasticsearch
  restore_config "/etc/elasticsearch/elasticsearch.yml"
  rm -rf "/usr/share/elasticsearch/data" &>/dev/null

  # Logstash
  # restore_config "/etc/logstash/logstash.yml"
  # rm -f "${AMC_PUBLIC}/logstash/armaif_"* &>/dev/null

  # if [ -f /.dockerenv ]; then
  #   restore_config "/etc/elasticsearch/jvm.options"
  #   restore_config "/etc/logstash/jvm.options"
  # fi

  # Vector
  rm -f "${AMC_PUBLIC}/vector/"* &>/dev/null

  # VENV

  # User
  rm -rf "${SUDOERS_FILE_PATH}"
  userdel "${PROJECT_USER}" &>/dev/null || true

  # Hosts, docker container not permit /etc/hosts
  sed -i '/^127.0.0.1\slicense-client/d' /etc/hosts &>/dev/null || true

  # Dirs
  rm -rf "${AMC_ETC}"/.[^.]* "${AMC_ETC}"/*
  rm -rf "${AMC_HOME}"/.[^.]* "${AMC_HOME}"/*
  rm -rf "${AMC_WWW}"/.[^.]* "${AMC_WWW}"/*
  rm -rf "${AMC_LOG}"/.[^.]* "${AMC_LOG}"/*
  ;;
purge)
  # Nginx
  rm -f "/etc/nginx/sites-available/${PROJECT}*" &>/dev/null

  # DB
  if which ucf &>/dev/null; then
    ucf --purge "${AMC_ETC}/debconf_dbconfig"
    ucfr --purge ${PROJECT} "${AMC_ETC}/debconf_dbconfig"
  fi

  ;;
*)
  echo "postrm called with unknown argument \`$1'" >&2
  exit 1
  ;;
esac
exit 0