#!/usr/bin/env sh

# SPDX-FileCopyrightText: 2022 Caleb La Grange <thonkpeasant@protonmail.com>
# SPDX-FileCopyrightText: 2022 Ferass El Hafidi <vitali64pmemail@protonmail.com>
# SPDX-FileCopyrightText: 2023 Leah Rowe <leah@libreboot.org>
# SPDX-License-Identifier: GPL-3.0-only

. "include/err.sh"

name=""
revision=""
location=""
url=""
bkup_url=""
tmp_dir=""
depend=""

main()
{
	[ -z "${1+x}" ] && fail 'Error: name not set'
	name=${1}

	read_config
	verify_config

	clone_project
	[ "${depend}" = "" ] || ./fetch ${depend} || exit 1

	rm -Rf ${tmp_dir} >/dev/null 2>&1 || exit 1
}

read_config()
{
	awkstr=" /\{.*${name}.*}{/ {flag=1;next} /\}/{flag=0} flag { print }"
	while read -r line ; do
		set ${line} >/dev/null 2>&1
		case ${line} in
		rev:*)
			revision=${2} ;;
		loc:*)
			location=${2} ;;
		url:*)
			url=${2} ;;
		bkup_url:*)
			bkup_url=${2} ;;
		depend:*)
			depend=${2} ;;
		esac
	done << EOF
	$(eval "awk '${awkstr}' resources/git/revisions")
EOF
}

verify_config()
{
	[ -z "${revision+x}" ] && fail 'Error: revision not set'
	[ -z "${location+x}" ] && fail 'Error: location not set'
	[ -z "${url+x}" ] && fail 'Error: url not set'
}

clone_project()
{
	tmp_dir=$(mktemp -dt "${name}_XXXXX")

	git clone ${url} ${tmp_dir} || git clone ${bkup_url} ${tmp_dir} || \
	    fail "ERROR: could not download ${name}"
	(
	cd ${tmp_dir} || fail "tmpdir not created"
	git reset --hard ${revision} || fail "Cannot reset revision"
	)
	patch_project

	[ ! -d "${location}" ] || \
		rm -Rf ${location} || fail "Can't remove directory '${location}'"
	mv ${tmp_dir} ${location} && return 0

	printf "ERROR: Could not copy temp file to destination.\n"
	fail " ${tmp_dir} > ${location} check permissions"
}

patch_project()
{
	patchdir="resources/${name}/patches"

	for patchfile in ${PWD}/${patchdir}/*.patch ; do
		[ -f "${patchfile}" ] || continue
		(
		cd ${tmp_dir} || fail "tmpdir not created"
		git am ${patchfile} || fail "Cannot patch project: $name"
		)
	done
}

fail()
{
	usage
	rm -Rf "${tmp_dir}" > /dev/null 2>&1 | :
	err "${1}"
}

usage()
{
	cat <<- EOF
	Usage: ./fetch [name]

	Options:
	name: Module name as specified in resources/git/revisions
	EOF
}

main $@