#!/usr/bin/env sh
# SPDX-License-Identifier: GPL-3.0-only
# 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>

. "include/err.sh"
. "include/git.sh"

name=""
revision=""
location=""
url=""
bkup_url=""
tmp_dir="${PWD}/tmp/gitclone"
depend=""

main()
{
	[ $# -gt 0 ] || fail "no argument given"

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

	read_config
	verify_config

	clone_project
	[ "${depend}" = "" ] || for d in ${depend} ; do
		./update project repo ${d} || \
		  fail "Cannot fetch dependency, ${d}, for project, ${name}"
	done

	rm -Rf "${tmp_dir}" || fail "cannot remove tmpdir, ${tmp_dir}"
}

read_config()
{
	revfile="$(mktemp -t gitrevisions.XXXXXXXXXX)" || \
	    fail "read_config: Cannot initialise tmpfile"

	cat config/git/* > "${revfile}" || \
	    fail "read_config: Cannot concatenate revision files"

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

	rm -f "${revfile}" || \
	    fail "read_config: can't remove tmp revfile"
}

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

clone_project()
{
	rm -Rf "${tmp_dir}" || fail "clone_project: cannot remove old tmpdir"
	mkdir -p "${tmp_dir%/*}" || fail "clone_project: can't mkdir"

	git clone ${url} "${tmp_dir}" || git clone ${bkup_url} "${tmp_dir}" || \
	    fail "clone_project: could not download ${name}"
	(
	cd "${tmp_dir}" || fail "clone_project: tmpdir not created"
	git reset --hard ${revision} || \
	    fail "clone_project: Cannot reset revision"
	)
	git_am_patches "${tmp_dir}" "${PWD}/config/${name}/patches" "fail" || \
	    fail "clone_project ${location}/: cannot apply patches"

	[ ! -d "${location}" ] || \
		rm -Rf "${location}" || \
		    fail "clone_project: Can't remove directory '${location}'"
	[ "${location}" = "${location%/*}" ] || mkdir -p ${location%/*} || \
	    fail "clone_project: cannot make directory for ${name}"
	mv "${tmp_dir}" "${location}" || \
	    fail "clone_project: could not copy temp file to destination"
}

fail()
{
	for x in "${location}" "${tmp_dir}"; do
		[ -z "${x}" ] || [ ! -d "${x}" ] || rm -Rf "${location}" || :
	done
	usage
	err "${1}"
}

usage()
{
	cat <<- EOF
	Usage: ./update project repo [name]

	Options:
	name: Module name as specified in files under config/git/
	EOF
}

main $@