_update_assets() {
	/usr/bin/unvanquished-update-paks
}

_delete_assets() {
	rm -f /var/lib/unvanquished/main/*.pk3
	rm -f /var/cache/unvanquished/update-paks/*
}

_update_desktop_environment() {
	# update icon cache
	xdg-icon-resource forceupdate --theme hicolor &> /dev/null

	# install unv:// protocol handler
	update-desktop-database -q
	update-mime-database /usr/share/mime >/dev/null
}

_add_server_user() {
	if ! getent passwd unvanquished >/dev/null; then
		useradd -rM -d /var/lib/unvanquished-server -c "Unvanquished dedicated server" -s /bin/false unvanquished
	fi
}

_delete_server_user() {
	if getent passwd unvanquished >/dev/null; then
		userdel unvanquished
	fi
}

_chown_server_home() {
	chown -R unvanquished:unvanquished /var/lib/unvanquished-server
}

_migrate() {
	# if there is /opt/unvanquished/main (containing untracked asset files) we have to migrate to the new filesystem layout
	if [ -d /opt/unvanquished/main ]; then
		# move assets
		echo "Moving assets from /opt/unvanquished to /var/lib/unvanquished..."
		mv -v /opt/unvanquished/main/*.pk3 /var/lib/unvanquished/main/

		# delete old asset directory
		rmdir /opt/unvanquished/main && rmdir /opt/unvanquished

		# chown new server directory
		_chown_server_home
	fi
}

post_install() {
	_add_server_user
	_chown_server_home
	_update_desktop_environment
	_update_assets
}

post_upgrade() {
	_migrate
	_update_assets
}

pre_remove() {
	_delete_assets
}

post_remove() {
	_delete_server_user
	_update_desktop_environment
}