#
# set -o errexit -o noglob are assumed.
#

# N.B.	URLs ($1) may contain `?' or '&' characters.
pkgp_fetch() {
	local _url="${1}" _sha256sum_src="${2}";
	if [ -z "${3}" ]; then
		_url_dst="${DLCACHEDIR}/$(basename "${_url}")";
	else
		_url_dst="${DLCACHEDIR}/${3}";
	fi;
	if [ "${ARG_OFFLINE:-0}" -eq 1 ]\
	|| [ -e "${_url_dst}.fetched" ]; then
		return 0;
	else
		wget ${DEFAULT_WGET_ARGS} -c -O "${_url_dst}" "${_url}";
	fi;
	if [ -n "${_sha256sum_src}" ]; then
		set -- $(openssl dgst -sha256 "${_url_dst}"); shift $((${#}-1));
		if [ "${_sha256sum_dst:=${1}}" != "${_sha256sum_src}" ]; then
			if [ "${ARG_IGNORE_SHA256SUMS:-0}" -eq 0 ]; then
				log_msg failexit "Error: hash mismatch for URL \`${_url}' (is: ${_sha256sum_dst}, should be: ${_sha256sum_src}.)";
			else
				log_msg warn "Warning: hash mismatch for URL \`${_url}' (is: ${_sha256sum_dst}, should be: ${_sha256sum_src}.)";
			fi;
		fi;
	fi;
	touch "${_url_dst}.fetched";
};

pkgp_fetch_git() {
	local _tgtdir="${1}" _subdir="${2}" _url="${3}" _branch="${4}";
	if [ "${ARG_OFFLINE:-0}" -eq 0 ]; then
		if [ -e "${DLCACHEDIR}/${_subdir}" ]; then
			(build_fileop cd "${DLCACHEDIR}/${_subdir}" &&\
				git pull origin "${_branch:-main}");
		else
			git clone "${_url}" "${DLCACHEDIR}/${_subdir}";
			if [ -n "${_branch}" -a		\
			     \( -z "${_branch#main}" \) -a	\
			     \( -z "${_branch#master}" \) ]; then
				(build_fileop cd "${DLCACHEDIR}/${_subdir}"	&&\
					git checkout -b "${_branch}");
			fi;
		fi;
	fi;
	build_fileop rm "${_tgtdir}/${_subdir}";
	build_fileop cp "${DLCACHEDIR}/${_subdir}" "${_tgtdir}";
};

pkgp_fetch_urls_git() {
	local _tgtdir="${2}" _url_spec _subdir _url _git_branch;
	for _url_spec in ${1}; do
		_subdir="${_url_spec%=*}";
		_url="${_url_spec#*=}";
		_url="${_url%@*}";
		if [ "${_url_spec#*@}" != "${_url_spec}" ]; then
			_git_branch=${_url_spec#*@};
		fi;
		pkgp_fetch_git "${_tgtdir}" "${_subdir}" "${_url}" "${_git_branch}";
	done;
};

pkg_fetch() {
	if [ -n "${1}" ]; then
		if [ "${1}" = "-git" ]; then
			shift; pkgp_fetch_urls_git "${1}" "${PKG_BASE_DIR}";
		else
			pkgp_fetch "${1}" "${2}";
		fi;
	else
		if [ -n "${PKG_URL}" ]; then
			pkgp_fetch "${PKG_URL}" "${PKG_SHA256SUM}" "${PKG_FNAME}";
		fi;
		if [ -n "${PKG_URLS_GIT}" ]; then
			pkgp_fetch_urls_git "${PKG_URLS_GIT}" "${PKG_BASE_DIR}";
		fi;
	fi;
};

# vim:filetype=sh