#!/bin/sh

set -e

pathfind() {
	OLDIFS="$IFS"
	IFS=:
	for p in $PATH; do
		if [ -x "$p/$*" ]; then
			IFS="$OLDIFS"
			return 0
		fi
	done
	IFS="$OLDIFS"
	return 1
}

apache_remove() {
    if [ diff /etc/taler-exchange/apache.conf /etc/apache2/conf-available/taler-exchange.conf >/dev/null 2>&1 ];
    then
	    rm -f /etc/apache2/conf-available/taler-exchange.conf
    fi
}

nginx_remove() {
    if [ diff /etc/taler-exchange/nginx.conf /etc/nginx/conf-available/taler-exchange.conf >/dev/null 2>&1 ];
    then
	    rm -f /etc/nginx/conf-available/taler-exchange.conf
    fi
}

if [ -f /usr/share/debconf/confmodule ];
then
    . /usr/share/debconf/confmodule
fi

if [ "$1" = "remove" ] || [ "$1" = "purge" ]; then
	db_version 2.0
	db_get taler-exchange/reconfigure-webserver
	webservers="$RET"
	for webserver in $webservers; do
		webserver=${webserver%,}
		if [ "$webserver" = "nginx" ] ; then
			nginx_remove
		else
			apache_remove
		fi
	done
fi


case "${1}" in
	purge)
		db_version 2.0

		db_get taler-exchange/eusername
		_EUSERNAME="${RET:-taler-exchange-httpd}"

		db_get taler-exchange/rsecusername
		_RSECUSERNAME="${RET:-taler-exchange-helper-rsa}"

		db_get taler-exchange/esecusername
		_ESECUSERNAME="${RET:-taler-exchange-helper-eddsa}"

		db_get taler-exchange/wireusername
		_WIREUSERNAME="${RET:-taler-exchange-wire}"

		db_get taler-exchange/aggrusername
		_AGGRUSERNAME="${RET:-taler-exchange-aggregator}"

		db_get taler-exchange/groupname
		_GROUPNAME="${RET:-taler-private}"

		if pathfind deluser
		then
			deluser --quiet --system ${_EUSERNAME} || true
			deluser --quiet --system ${_RSECUSERNAME} || true
			deluser --quiet --system ${_ESECUSERNAME} || true
			deluser --quiet --system ${_WIREUSERNAME} || true
			deluser --quiet --system ${_AGGRUSERNAME} || true
		fi

		if pathfind delgroup
		then
			delgroup --quiet --system --only-if-empty ${_GROUPNAME} || true
		fi

		rm -rf /var/log/taler-exchange/ /var/lib/taler-exchange /etc/default/taler-exchange
		;;

	remove|upgrade|failed-upgrade|abort-install|abort-upgrade|disappear)

		;;

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

#DEBHELPER#

exit 0