#!/bin/sh
set -e

if [ -d /run/systemd/system ]; then
	systemctl --system daemon-reload >/dev/null || true
fi

if [ "$1" = "remove" ]; then
	if [ -x "/usr/bin/deb-systemd-helper" ]; then
		deb-systemd-helper mask evcc.service >/dev/null || true
	fi
fi

if [ "$1" = "purge" ]; then
	if [ -x "/usr/bin/deb-systemd-helper" ]; then
		deb-systemd-helper purge evcc.service >/dev/null || true
		deb-systemd-helper unmask evcc.service >/dev/null || true
	fi
fi




# if interactive: Call /usr/bin/evcc checkconfig and capture the output (newer version)
# if output contains "config valid" then do nothing
# else: Ask user if he wants to keep the old version (working) or the new version (not working) 
# Remember the choice with /tmp/.evccrollback and fail new-postrm failed-upgrade old-version new-version to initiate dpkg's rollback
if [ "$1" = "upgrade" ]; then
	INTERACTIVE=0
	# is shell script interactive?
	if [ -t 0 ]; then
	  INTERACTIVE=1
	else
	  INTERACTIVE=0
	fi

	if [ $INTERACTIVE -eq 1 ]; then
	    checkConfigOutput=$(/usr/bin/evcc checkconfig 2>&1 || true)
		if ! echo "$checkConfigOutput" | grep -q "config valid"; then
			echo "--------------------------------------------------------------------------------"
			echo "ERROR: your evcc configuration is not compatible with the new version. Please consider reading the release notes: https://github.com/evcc-io/evcc/releases"
			echo "checkconfig Output:" 
			echo "$checkConfigOutput"
			echo "--------------------------------------------------------------------------------"
	
			while true; do
				echo "Do you want to keep your old (working) evcc version? [Y/n]: "
				read choice
				case "$choice" in
					n*|N*|"")
						echo "We will keep the new version. Your evcc configuration stays untouched!"
						break
						;;
					y*|Y*)
						echo "The old version will be restored. Your evcc configuration stays untouched! Following errors are intended:"
						touch /tmp/.evccrollback
						exit 1
						break
						;;
					*)
						;;
				esac
			done
		fi
	fi 
fi

# if upgrade goal fails, new-postrm failed-upgrade old-version new-version is called. It should fail to initiate rollback
if [ "$1" = "failed-upgrade" ]; then
	if [ -f "/tmp/.evccrollback" ]; then
		rm "/tmp/.evccrollback"
		exit 1
	fi
fi