#!/bin/bash

# Copyright (C) 2024 Pädagogisches Landesinstitut Rheinland-Pfalz
# Copyright (C) 2024 Daniel Teichmann <daniel.teichmann@das-netzwerkteam.de>
#
# This program is free software; you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation; either version 2 of the License, or
# (at your option) any later version.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with this program; if not, write to the
# Free Software Foundation, Inc.,
# 51 Franklin St, Fifth Floor, Boston, MA 02110-1301, USA.

# postinst script for debian-edu-router-fai
#
# see: dh_installdeb(1)

set -e

# DEBCONF IS NOT AVAILABLE, PLEASE AMEND TO Pre-Depends BEFORE ENABLING.
#. /usr/share/debconf/confmodule || exit 255

if [ -e /etc/debian-edu/router.conf ]; then
	source /etc/debian-edu/router.conf
fi
PRODUCTNAME="${PRODUCTNAME:-"Debian Edu Router"}"
PRODUCTNAME_FAI="${PRODUCTNAME_FAI:-"${PRODUCTNAME} FAI"}"
PRODUCTVERSION=$(dpkg-query --show --showformat='${Version}' "${DPKG_MAINTSCRIPT_PACKAGE}" 2>/dev/null || echo "UNKNOWN")
# db_title "${PRODUCTNAME_FAI}"

common_file="/usr/share/debian-edu-router/debian-edu-router.common"

# Load common functions, variables and stuff.
if [ -s "$common_file" ]; then
	source "$common_file"
else
	echo "Could not load common file at "$common_file"."
	exit 0;
fi

# db_version 2.0
# db_capb backup escape

# summary of how this script can be called:
#        * <postinst> `configure' <most-recently-configured-version>
#        * <old-postinst> `abort-upgrade' <new version>
#        * <conflictor's-postinst> `abort-remove' `in-favour' <package>
#          <new-version>
#        * <postinst> `abort-remove'
#        * <deconfigured's-postinst> `abort-deconfigure' `in-favour'
#          <failed-install-package> <version> `removing'
#          <conflicting-package> <version>
# for details, see https://www.debian.org/doc/debian-policy/ or
# the debian-policy package

# Load dialog answers
# db_get debian-edu-router-fai... || true
# question="${RET}"

function center() {
    local total_width="$1"
    local str="$2"
    local str_length=${#str}
    local padding=$(( (total_width - str_length) / 2 ))
    local left_padding=$padding
    local right_padding=$(( total_width - str_length - left_padding ))

    printf "%${left_padding}s%s%${right_padding}s" "" "$str" ""
}

function create_files_from_templates() {
	product_name_and_version="${PRODUCTNAME_FAI} ${PRODUCTVERSION}"
	# Pad $product_name_and_version, with spaces left and right, to make it center aligned.
	product_name_and_version="$(center 54 "$product_name_and_version")"

	fai_templates_dir="/usr/share/debian-edu-router/templates/debian-edu-router-fai.TEMPLATE/"

	# NOTE: .temp, not .in! .in files are also used by FAI.
	for conf_tpl in $(ls ${fai_templates_dir}/*.temp); do
		conf="/etc/debian-edu/fai/debian-edu-router-fai.TEMPLATE/$(basename ${conf_tpl/.temp/})"

		cp "${conf_tpl}" "${conf}"
		sed -i "${conf}" -e "s|@PRODUCT_NAME_AND_VERSION@|${product_name_and_version}|" \
		                 ${NULL}
	done
}

function main() {
	create_files_from_templates

	debug_log "Configuration of '$PRODUCTNAME' FAI finished."
}

case "$1" in
	configure)
		main
		;;

	abort-upgrade)
		notice_log "Upgrade of debian-edu-router-fai package was aborted."
		;;
	*)
		error_log "postinst called with unknown argument \`$1'" >&2
		exit 1
		;;
esac

# dh_installdeb will replace this with shell code automatically
# generated by other debhelper scripts.



exit 0