#
# set +o errexit -o noglob is assumed.
#

#
# ex_pkg_check_depends() - check single named package for unsatisfied dependencies
# @_pkg_disabled:	list of disabled packages
# @_pkg_finished:	list of finished packages
# @_pkg_name:		single package name
# @_pkg_wait:		list of in-progress packages
# @_restart_recursive:	optional flag specifiying either no dependency expansion (0,) dependency expansion (1,) dependency expansion and forcibly rebuild (2,) forcibly rebuild reverse dependencies (3.)
#
# Return:		zero (0) given no outstanding dependencies, non-zero (>0) otherwise
#
ex_pkg_check_depends() {
	local	_pkg_disabled="${1}" _pkg_finished="${2}" _pkg_name="${3}"	\
		_pkg_wait="${4}" _restart_recursive="${5}"			\
		_pkg_depends="" _pkg_name_depend="" _dependfl=0;
	if _pkg_depends="$(rtl_uniq $(rtl_lunfold_depends 'PKG_${_name}_DEPENDS' $(rtl_get_var_unsafe -u "PKG_"${_pkg_name}"_DEPENDS")))"\
	&& [ -n "${_pkg_depends}" ]; then
		if [ -z "${_restart}" ]\
		|| [ "${_restart_recursive:-0}" -ge 1 ]; then
			for _pkg_name_depend in $(rtl_uniq ${_pkg_depends}); do
				if ! rtl_lmatch "${_pkg_disabled}" "${_pkg_name_depend}"\
				&& ! rtl_lmatch "${_pkg_finished}" "${_pkg_name_depend}"; then
					_dependfl=1; break;
				elif rtl_lmatch "${_pkg_wait}" "${_pkg_name_depend}"; then
					_dependfl=1; break;
				fi;
			done;
		fi;
	fi;
	return "${_dependfl}";
};

#
# ex_pkg_find_package() - find build group a single named package belongs to
# @_group_names:	build group names
# @_pkg_name:		single named package
#
# Return:		zero (0) on success, non-zero (>0) if package not found, group name on stdout if package was found.
#
ex_pkg_find_package() {
	local _group_names="${1}" _pkg_name="${2}" _group_name="" _pkg_names="";
	for _group_name in ${_group_names}; do
		if _pkg_names="$(rtl_get_var_unsafe -u "${_group_name}_PACKAGES")"\
		&& [ -n "${_pkg_names}" ]\
		&& rtl_lmatch "${_pkg_names}" "${_pkg_name}"; then
			_foundfl=1; break;
		fi;
	done;
	case "${_foundfl:-0}" in
	0)	return 1; ;;
	1)	echo "${_group_name}"; return 0; ;;
	esac;
};

#
# ex_pkg_get_packages() - get list of packages belonging to single named build group
# @_group_name:	build group name
#
# Return:	zero (0) on success, non-zero (>0) on failure, list of package names on stdout on success.
#
ex_pkg_get_packages() {
	local _group_name="${1}" _pkg_names="";
	if _pkg_names="$(rtl_get_var_unsafe -u "${_group_name}_PACKAGES")"\
	&& [ -n "${_pkg_names}" ]; then
		echo "${_pkg_names}"; return 0;
	else
		return 1;
	fi;
};

#
# ex_pkg_unfold_depends() - unfold list of package names into dependency-expanded set of complete, disabled, finished, and outstanding package names
# @_group_name:		build group name
# @_pkg_names:		list of package names
# @_restart:		optional whitespace-separated list of package names to rebuild
# @_restart_recursive:	optional flag specifiying either no dependency expansion (0,) dependency expansion (1,) dependency expansion and forcibly rebuild (2,) forcibly rebuild reverse dependencies (3.)
# @_test_finished:	only exclude disabled packages from ${EX_PKG_NAMES} (0,) split finished packages into ${EX_PKG_FINISHED}
#
# Return:		zero (0) on success, non-zero (>0) on failure, ${EX_PKG_DISABLED}, ${EX_PKG_FINISHED}, and ${EX_PKG_NAMES} set post-return.
#
ex_pkg_unfold_depends() {
	local	_group_name="${1}" _pkg_names="${2}" _restart="${3}"	\
		_restart_recursive="${4}" _test_finished="${5}"		\
		_pkg_name="" _restartfl=0;
	if [ -n "${_restart}" ] && ! rtl_lmatch "${_restart}" "ALL LAST"; then
		_pkg_names="$(rtl_lsearch "${_pkg_names}" "${_restart}")";
	fi;
	if [ -n "${_restart}" ]\
	&& [ "${_restart_recursive:-0}" -ge 1 ]\
	&& [ "${_restart_recursive:-0}" -le 2 ]; then
		_pkg_names="$(rtl_uniq $(rtl_lunfold_depends 'PKG_${_name}_DEPENDS' ${_pkg_names}))";
	fi;
	for _pkg_name in ${_pkg_names}; do
		if [ "${_restart}" = "ALL" ]\
		|| rtl_lmatch "${_restart}" "${_pkg_name}"; then
			_restartfl=1;
		else
			_restartfl=0;
		fi;
		if [ "x$(rtl_get_var_unsafe -u "PKG_${_pkg_name}_DISABLED")" = "x1" ]; then
			EX_PKG_DISABLED="$(rtl_lconcat "${EX_PKG_DISABLED}" "${_pkg_name}")";
			_pkg_names="$(rtl_lfilter "${_pkg_names}" "${_pkg_name}")";
		elif [ "${_test_finished:-1}" -eq 1 ]\
		&&   ex_pkg_state_test "${_pkg_name}" finish\
		&&   [ "${_restartfl:-0}" -eq 0 ]\
		&&   [ "${_restart_recursive:-0}" -ne 2 ]\
		&&   [ "x$(rtl_get_var_unsafe -u "${_group_name}_FORCE")" != "x1" ]; then
			EX_PKG_FINISHED="$(rtl_lconcat "${EX_PKG_FINISHED}" "${_pkg_name}")";
			_pkg_names="$(rtl_lfilter "${_pkg_names}" "${_pkg_name}")";
		fi;
	done;
	EX_PKG_DISABLED="$(rtl_uniq ${EX_PKG_DISABLED})";
	EX_PKG_FINISHED="$(rtl_uniq ${EX_PKG_FINISHED})";
	EX_PKG_NAMES="$(rtl_uniq ${_pkg_names})";
};

#
# ex_pkg_unfold_rdepends() - unfold list of package names into reverse dependency-expanded set of complete, disabled, finished, and outstanding package names
# @_group_name:		build group name
# @_pkg_names:		list of package names
# @_restart:		optional whitespace-separated list of package names to rebuild
# @_restart_recursive:	optional flag specifiying either no dependency expansion (0,) dependency expansion (1,) dependency expansion and forcibly rebuild (2,) forcibly rebuild reverse dependencies (3.)
# @_test_finished:	only exclude disabled packages from ${EX_PKG_NAMES} (0,) split finished packages into ${EX_PKG_FINISHED}
#
# Return:		zero (0) on success, non-zero (>0) on failure, ${EX_PKG_DISABLED}, ${EX_PKG_FINISHED}, and ${EX_PKG_NAMES} set post-return.
#
ex_pkg_unfold_rdepends() {
	local	_group_name="${1}" _pkg_names="${2}" _restart="${3}" _test_finished="${4}"	\
		_pkg_depends="" _pkg_name="" _pkg_name_depend="" _pkg_rdepends="" _restartfl=0;
	for _pkg_name_depend in ${_restart}; do
		for _pkg_name in ${_pkg_names}; do
			if [ "${_pkg_name}" != "${_pkg_name_depend}" ]\
			&& [ "x$(rtl_get_var_unsafe -u "PKG_${_pkg_name}_DISABLED")" != "x1" ]\
			&& _pkg_depends="$(rtl_lunfold_depends 'PKG_${_name}_DEPENDS' $(rtl_get_var_unsafe -u "PKG_"${_pkg_name}"_DEPENDS"))"\
			&& [ -n "${_pkg_depends}" ]\
			&& rtl_lmatch "${_pkg_depends}" "${_pkg_name_depend}"; then
				_pkg_rdepends="$(rtl_lconcat "${_pkg_rdepends}" "${_pkg_name}")";
			fi;
		done;
	done;
	_pkg_names="";
	for _pkg_name in ${_pkg_rdepends}; do
		if _pkg_depends="$(rtl_lunfold_depends 'PKG_${_name}_DEPENDS' $(rtl_get_var_unsafe -u "PKG_"${_pkg_name}"_DEPENDS"))"\
		&& [ -n "${_pkg_depends}" ]; then
			for _pkg_name_depend in ${_pkg_depends}; do
				if [ "x$(rtl_get_var_unsafe -u "PKG_${_pkg_name_depend}_DISABLED")" = "x1" ]; then
					EX_PKG_DISABLED="$(rtl_lconcat "${EX_PKG_DISABLED}" "${_pkg_name_depend}")";
				elif [ "${_test_finished:-1}" -eq 1 ]\
				&&   ex_pkg_state_test "${_pkg_name_depend}" finish\
				&&   [ "x$(rtl_get_var_unsafe -u "${_group_name}_FORCE")" != "x1" ]\
				&&   ! rtl_lmatch "${_pkg_rdepends}" "${_pkg_name_depend}"; then
					EX_PKG_FINISHED="$(rtl_lconcat "${EX_PKG_FINISHED}" "${_pkg_name_depend}")";
				elif [ "${_test_finished:-1}" -eq 0 ]\
				||   ! ex_pkg_state_test "${_pkg_name_depend}" finish\
				||   [ "x$(rtl_get_var_unsafe -u "${_group_name}_FORCE")" = "x1" ]; then
					_pkg_names="$(rtl_lconcat "${_pkg_names}" "${_pkg_name_depend}")";
				fi;
			done;
		fi;
		_pkg_names="$(rtl_lconcat "${_pkg_names}" "${_pkg_name}")";
	done;
	EX_PKG_DISABLED="$(rtl_uniq ${EX_PKG_DISABLED})";
	EX_PKG_FINISHED="$(rtl_uniq ${EX_PKG_FINISHED})";
	EX_PKG_NAMES="$(rtl_uniq ${_pkg_names})";
};

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