#!/usr/bin/env sh

#
#  helper script: update project configs (based on defconfig)
#
#	Copyright (C) 2021, 2023 Leah Rowe <info@minifree.org>
#	Copyright (C) 2022 Ferass El Hafidi <vitali64pmemail@protonmail.com>
#
#	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 3 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, see <http://www.gnu.org/licenses/>.
#

[ "x${DEBUG+set}" = 'xset' ] && set -v
set -u -e

cfgsdir=""
mode=""
project=""

main()
{
	while getopts m:u: option
	do
		case "${1}" in
		-u)
			mode="oldconfig"
			shift ;;
		-m)
			mode="menuconfig"
			shift ;;
		*)
			err "Invalid option" ;;
		esac
		project="${OPTARG}"
		shift
	done
	[ -z "${mode}" ] && err "mode not given (-m menuconfig or -u oldconfig)"
	cfgsdir="resources/${project}"
	[ -f "${cfgsdir}/build.list" ] || err "Invalid project name given"

	printf "Updating %s configs using: make %s\n\n" "${project}" "${mode}"

	if [ $# -gt 0 ]; then
		for target in "${@}"; do
			configure_target "${target}"
		done
	else
		for target in ${cfgsdir}/*; do
			[ ! -d "${target}" ] && continue
			configure_target "${target##*/}"
		done
	fi
}

configure_target()
{
	target=${1}

	targetdir="${cfgsdir}/${target}"

	if [ ! -f "${targetdir}/target.cfg" ]; then
		printf "\nmodify/defconfig %s: no target.cfg for %s. SKIP!\n" \
			"${project}" "${target}"
		return 0
	fi

	tree="undefined"
	. "${targetdir}/target.cfg"
	[ "${tree}" = "undefined" ] && return 0

	codedir="${project}/${tree}"
	[ -d "${codedir}" ] || ./fetch_trees ${project} ${tree} || \
	    err "cant download $project"

	for cfg in "${targetdir}/config/"*; do
		[ ! -f "${cfg}" ] && continue
		make distclean -BC "${codedir}"

		[ -f "${cfg}_" ] && err "${cfg}_ exists from old run"
		cp "${cfg}" "${cfg}_"

		cp "${cfg}_" "${codedir}/.config"
		make ${mode} -BC "${codedir}"
		mv "${codedir}/.config" "${cfg}"

		make distclean -BC "${codedir}"
		rm -f "${cfg}_"
	done
}

err()
{
	printf "ERROR: modify/defconfig: %s\n" "${1}" 1>&2
	exit 1
}

main $@