# SPDX-License-Identifier: GPL-3.0-or-later
# SPDX-FileCopyrightText: 2020,2021,2023 Leah Rowe <leah@libreboot.org>
# SPDX-FileCopyrightText: 2022 Caleb La Grange <thonkpeasant@protonmail.com>

# This file is only used by update/project/trees

eval "$(setvars "" _target rev _xm loc url bkup_url depend)"
tmp_git_dir="${PWD}/tmp/gitclone"

fetch_project_trees()
{
	_target="${target}"
	[ -d "src/${project}/${project}" ] || fetch_from_upstream
	fetch_config
	[ -z "${rev}" ] && err "fetch_project_trees $target: undefined rev"
	if [ -d "src/${project}/${tree}" ]; then
		printf "download/%s %s (%s): exists\n" \
		    "${project}" "${tree}" "${_target}" 1>&2
		return 0
	fi
	prepare_new_tree
}

fetch_from_upstream()
{
	[ -d "src/${project}/${project}" ] && return 0

	x_ mkdir -p "src/${project}"
	fetch_project_repo "${project}"
}

fetch_config()
{
	rm -f "${cfgsdir}/"*/seen || err "fetch_config ${cfgsdir}: !rm seen"
	while true; do
		eval "$(setvars "" rev tree)"
		_xm="fetch_config ${project}/${_target}"
		load_target_config "${_target}"
		[ "${_target}" != "${tree}" ] && _target="${tree}" && continue
		break
	done
}

load_target_config()
{
	[ -f "${cfgsdir}/${1}/target.cfg" ] || \
		err "${_xm} check: target.cfg does not exist"
	[ -f "${cfgsdir}/${1}/seen" ] && \
		err "${_xm} check: infinite loop in tree definitions"

	. "${cfgsdir}/${1}/target.cfg" || \
	    err "load_target_config ${cfgsdir}/${1}: cannot load config"

	touch "${cfgsdir}/${1}/seen" || err "load_config $cfgsdir/$1: !mk seen"
}

prepare_new_tree()
{
	printf "Creating %s tree %s (%s)\n" "${project}" "${tree}" "${_target}"

	x_ cp -R "src/${project}/${project}" "src/${project}/${tree}"
	git_reset_rev "src/${project}/${tree}" "${rev}"
	(
	x_ cd "src/${project}/${tree}"
	if [ -f ".gitmodules" ]; then
		git submodule update --init --checkout || \
		    err "prepare_new_tree ${project}/${tree}: !submodules"
	fi
	)
	git_am_patches "$PWD/src/$project/$tree" "$PWD/$cfgsdir/$tree/patches"
}

fetch_project_repo()
{
	scan_config "${project}" "config/git" "err"
	verify_config

	clone_project
	[ -z "${depend}" ] || for d in ${depend} ; do
		x_ ./update trees -f ${d}
	done
	rm -Rf "${tmp_git_dir}" || err "fetch_repo: !rm -Rf ${tmp_git_dir}"
}

verify_config()
{
	[ -z "${rev+x}" ] && err 'verify_config: rev not set'
	[ -z "${loc+x}" ] && err 'verify_config: loc not set'
	[ -z "${url+x}" ] && err 'verify_config: url not set'
	return 0
}

clone_project()
{
	rm -Rf "${tmp_git_dir}" || err "clone_project: !rm -Rf ${tmp_git_dir}"
	mkdir -p "${tmp_git_dir%/*}" || \
	    err "clone_project: !mkdir -p ${tmp_git_dir%/*}"

	loc="${loc#src/}"
	loc="src/${loc}"
	if [ -d "${loc}" ]; then
		printf "%s already exists, so skipping download\n" "$loc" 1>&2
		return 0
	fi

	git clone ${url} "${tmp_git_dir}" || \
	    git clone ${bkup_url} "${tmp_git_dir}" || \
	    err "clone_project: could not download ${project}"
	git_reset_rev "${tmp_git_dir}" "${rev}"
	git_am_patches "${tmp_git_dir}" "${PWD}/config/${project}/patches"

	x_ rm -Rf "${loc}"
	[ "${loc}" = "${loc%/*}" ] || x_ mkdir -p ${loc%/*}
	mv "${tmp_git_dir}" "${loc}" || \
	    err "clone_project: !mv ${tmp_git_dir} ${loc}"
}

git_reset_rev()
{
	(
	cd "${1}" || err "git_reset_rev: !cd ${1}"
	git reset --hard ${2} || err "!git reset ${1} <- ${2}"
	if [ "${project}" != "coreboot" ] && [ "${project}" != "u-boot" ] && \
	    [ -f ".gitmodules" ]; then
		git submodule update --init --checkout || \
		    err "git_reset_rev ${1}: can't download submodules"
	fi
	)
}

git_am_patches()
{
	sdir="${1}" # assumed to be absolute path
	patchdir="${2}" # ditto
	(
	cd "${sdir}" || err "git_am_patches: !cd ${sdir}"
	for patch in "${patchdir}/"*; do
		[ -L "${patch}" ] && continue
		[ -f "${patch}" ] || continue
		if ! git am "${patch}"; then
			git am --abort || err  "${sdir}: !git am --abort"
			err  "!git am ${patch} -> ${sdir}"
		fi
	done
	)
	for patches in "${patchdir}/"*; do
		[ -L "${patches}" ] && continue
		[ ! -d "${patches}" ] && continue
		git_am_patches "${sdir}" "${patches}"
	done
}
