#
# Copyright (c) 2016, 2017, 2018, 2019, 2020, 2021, 2022, 2023 LucĂ­a Andrea Illanes Albornoz <lucia@luciaillanes.de>
# set +o errexit -o noglob -o nounset is assumed.
#

#
# rtlp_fetch_url_git() - fetch Git URL for item
# @_dlcachedir:		absolute pathname to download cache directory
# @_git_args:		optional argument string to pass to git(1)
# @_git_branch:		name of Git branch
# @_mirrors:		optional list of mirror base URLs
# @_name:		single item name
# @_target_subdir:	target subdirectory name
# @_target_dname:	target directory name
# @_url:		single Git URL
#
# Returns:		zero (0) on success, non-zero (>0) on failure
#
rtlp_fetch_url_git() {
	local	_rpfug_dlcachedir="${1}" _rpfug_git_args="${2}" _rpfug_git_branch="${3}"	\
		_rpfug_mirrors="${4}" _rpfug_name="${5}" _rpfug_target_subdir="${6}"		\
		_rpfug_target_dname="${7}" _rpfug_url="${8}"					\
		_rpfug_dlcachedir_full="" _rpfug_clonefl=0 _rpfug_dname=""			\
		_rpfug_git_pull_log_fname="" _rpfug_oldpwd="" _rpfug_url_base="";

	_rpfug_dlcachedir_full="${_rpfug_dlcachedir}/${_rpfug_target_subdir##*/}";
	(set -o errexit -o noglob -o nounset;
	rtl_flock_acquire 4 || exit "${?}";
	trap "rm -f \"${_rpfug_dlcachedir_full%%[/]}.fetching\"" EXIT;
	if [ -e "${_rpfug_dlcachedir_full}" ]; then
		(rtl_fileop cd "${_rpfug_dlcachedir_full}" || exit 1;
		 _rpfug_git_pull_log_fname="$(mktemp)" || exit 1;
		 trap 'rm -f "${_rpfug_git_pull_log_fname}" 2>/dev/null' EXIT HUP INT TERM USR1 USR2;
		 if ! git pull ${_rpfug_git_args} origin "${_rpfug_git_branch:-main}" >"${_rpfug_git_pull_log_fname}" 2>&1; then
			if grep -q '^fatal: refusing to merge unrelated histories$' "${_rpfug_git_pull_log_fname}"; then
				cat "${_rpfug_git_pull_log_fname}"; printf "Detected forced push(es).\n";
			elif grep -q '^Automatic merge failed; fix conflicts and then commit the result.$' "${_rpfug_git_pull_log_fname}"; then
				cat "${_rpfug_git_pull_log_fname}"; printf "Detected forced push(es).\n"; git merge --abort;
			else
				cat "${_rpfug_git_pull_log_fname}"; exit 1;
			fi;
			while true; do
				printf "Attempting git-reset(1) --hard HEAD^ and git-pull(1)...\n";
				if ! git reset --hard "HEAD^"; then
					exit 1;
				elif git pull ${_rpfug_git_args} origin "${_rpfug_git_branch:-main}"; then
					exit 0;
				fi;
			done;
		 else
			cat "${_rpfug_git_pull_log_fname}"; exit 0;
		 fi;) || return 1;
		(rtl_fileop cd "${_rpfug_dlcachedir_full}" &&\
			git submodule update) || return 1;
	else	if git clone ${_rpfug_git_args} -b "${_rpfug_git_branch:-main}" "${_rpfug_url}" "${_rpfug_dlcachedir_full}"; then
			_rpfug_clonefl=1;
		elif [ "${_rpfug_mirrors}" = "skip" ]; then
			return 1;
		else	for _rpfug_url_base in ${_rpfug_mirrors}; do
				if git clone ${_rpfug_git_args} -b "${_rpfug_git_branch:-main}" "${_rpfug_url_base}/${_rpfug_name}/${_rpfug_target_subdir}" "${_rpfug_dlcachedir_full}"; then
					_rpfug_clonefl=1; break;
				fi;
			done;
		fi;
		if [ "${_rpfug_clonefl}" -eq 0 ]; then
			return 1;
		else	if [ "${_rpfug_git_branch:+1}" = 1 ]; then
				(rtl_fileop cd "${_rpfug_dlcachedir_full}" &&\
					git checkout "${_rpfug_git_branch}") || return 1;
			fi;
			(rtl_fileop cd "${_rpfug_dlcachedir_full}" &&\
				git submodule update --init) || return 1;
		fi;
	fi;
	if [ "${_rpfug_dlcachedir}" != "${_rpfug_target_dname}" ]; then
		_rpfug_oldpwd="${PWD}"; rtl_fileop cd "${_rpfug_target_dname}" || return 1;
		rtl_fileop rm "${_rpfug_target_dname}/${_rpfug_target_subdir}" || return 1;
		_rpfug_dname="${_rpfug_target_dname}/${_rpfug_target_subdir}"; rtl_dirname \$_rpfug_dname;
		if ! [ -e "${_rpfug_dname}" ]; then
			rtl_fileop mkdir "${_rpfug_dname}";
		fi;
		rtl_fileop cp "${_rpfug_dlcachedir_full}" "${_rpfug_target_dname}/${_rpfug_target_subdir}" || return 1;
		rtl_fileop cd "${_rpfug_oldpwd}" || return 1;
	fi) 4<>"${_rpfug_dlcachedir_full%%[/]}.fetching";

	if [ "${?}" -eq 0 ]; then
		cd "$(pwd)";
	else
		return 1;
	fi;
};

#
# rtlp_fetch_mirror_urls_git() - setup mirror for Git URL(s)
# @_git_args:		optional argument string to pass to git(1)
# @_target_dname:	target directory name
# @...:			list of Git URLs
#
# Returns:		zero (0) on success, non-zero (>0) on failure
#
rtl_fetch_mirror_urls_git() {
	local	_rfmug_git_args="${1}" _rfmug_target_dname="${2}"				\
		_rfmug_dname="" _rfmug_rc=0 _rfmug_repo_dname="" _rfmug_target_subdir=""	\
		_rfmug_url="" _rfmug_url_spec=""; shift 2;

	for _rfmug_url_spec in "${@}"; do
		_rfmug_target_subdir="${_rfmug_url_spec%=*}"; _rfmug_target_subdir="${_rfmug_target_subdir##*/}"; _rfmug_url="${_rfmug_url_spec#*=}"; _rfmug_url="${_rfmug_url%@*}";
		_rfmug_repo_dname="${_rfmug_target_subdir}"; [ "${_rfmug_repo_dname%.git}" = "${_rfmug_repo_dname}" ] && _rfmug_repo_dname="${_rfmug_repo_dname}.git";

		_rfmug_dname="${_rfmug_target_dname}"; rtl_dirname \$_rfmug_dname;
		if ! [ -e "${_rfmug_dname}" ]; then
			rtl_fileop mkdir "${_rfmug_dname}";
		fi;
		(set -o errexit -o noglob -o nounset;
		rtl_flock_acquire 4 || exit "${?}";
		trap "rm -f \"${_rfmug_target_dname}/.fetching\"" EXIT;
		if [ -e "${_rfmug_target_dname}/${_rfmug_repo_dname}" ]; then
			(rtl_fileop cd "${_rfmug_target_dname}/${_rfmug_repo_dname}" && git fetch ${_rfmug_git_args} --all) || return 1;
		else	(rtl_fileop cd "${_rfmug_target_dname}" && git clone ${_rfmug_git_args} --mirror "${_rfmug_url}" "${_rfmug_repo_dname}") || return 1;
		fi) 4<>"${_rfmug_target_dname}/.fetching";
		if [ "${?}" -ne 0 ]; then
			_rfmug_rc=1;
		fi;
	done;

	return "${_rfmug_rc}";
};

#
# rtl_fetch_url_git() - fetch Git URL(s) for item
# @_dlcachedir:		absolute pathname to download cache directory
# @_git_args:		optional argument string to pass to git(1)
# @_target_dname:	target directory name
# @_name:		single item name
# @_mirrors:		optional list of mirror base URLs
# @...:			list of Git URLs
#
# Returns:		zero (0) on success, non-zero (>0) on failure
#
rtl_fetch_urls_git() {
	local	_rfug_dlcachedir="${1}" _rfug_git_args="${2}" _rfug_target_dname="${3}"	\
		_rfug_name="${4}" _rfug_mirrors="${5}"					\
	       	_rfug_git_branch="" _rfug_target_subdir="" _rfug_url="" _rfug_url_spec="";
	shift 5;

	for _rfug_url_spec in "${@}"; do
		_rfug_target_subdir="${_rfug_url_spec%=*}";
		_rfug_url="${_rfug_url_spec#*=}";
		_rfug_url="${_rfug_url%@*}";
		if [ "${_rfug_url_spec#*@}" != "${_rfug_url_spec}" ]; then
			_rfug_git_branch=${_rfug_url_spec#*@};
		fi;
		if ! rtlp_fetch_url_git	\
				"${_rfug_dlcachedir}" "${_rfug_git_args}"	\
				"${_rfug_git_branch}" "${_rfug_mirrors}"	\
				"${_rfug_name}" "${_rfug_target_subdir}"	\
				"${_rfug_target_dname}" "${_rfug_url}";
		then
			return 1;
		fi;
	done;

	return 0;
};

# vim:filetype=sh textwidth=0