_good_ver="1.14.4_28.1.0-1"

post_install() {
	if ! getent group "forge" &>/dev/null; then
		echo "Adding forge system group..."
		groupadd -r forge 1>/dev/null
	fi

	if ! getent passwd "forge" &>/dev/null; then
		echo "Adding forge system user..."
		useradd -r -g forge -d /srv/forge forge 1>/dev/null
	fi

	chown -R forge:forge /srv/forge

	echo "The world data is stored under /srv/forge and the server runs as the forge user to increase security."
	echo "Use the forged script under /usr/bin/forged to start, stop or backup the server."
	echo "Adjust the configuration file under /etc/conf.d/forge to your liking."
	echo "Make sure to change the SERVER_START_CMD variable if you want to use a JVM other than OpenJDK 8."
	echo "Please note that you need Java 8 in order to run Forge."
	echo "For the server to start you have to accept the EULA in /srv/forge/eula.txt!"
	echo "The EULA file is generated after the first server start."
}

post_upgrade() {
	if [ "$(vercmp "$2" "$_good_ver")" -lt 0 ]; then
		post_install

		IFS="_" read -ra _good_ver_temp <<< "$_good_ver"
		_minecraft_ver=${_good_ver_temp[0]}
		_old_name="forge-${_minecraft_ver}"

		echo "==> NOTICE: All filenames have been changed from \"${_old_name}d\" to \"forged\"!"
		echo "==> For example:"
		echo "==> /usr/lib/systemd/system/${_old_name}d.service -> /usr/lib/systemd/system/forged.service"
		echo "==> /usr/bin/${_old_name}d -> /usr/bin/forged"
		echo "==> /srv/${_old_name} -> /srv/forge"

		if [ -d "/srv/${_old_name}" ]; then
			find "/srv/${_old_name}" -mindepth 1 -maxdepth 1 | while read -r _file; do
				mv "$_file" "/srv/forge${_file#"/srv/${_old_name}"}"
			done
			rm -rf "/srv/${_old_name}"
			echo "==> Game saves in /srv/${_old_name} were moved to /srv/forge."
		fi

		echo "==> The ${_old_name//./-} user was preserved on your system."
	fi
	chown -R forge:forge /srv/forge
}

post_remove() {
	[ -d "/srv/forge" ] && echo "Game saves in /srv/forge were kept on your system."
	echo "The forge user was preserved on your system."
}