#
# 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.
#

#
# Private subroutines
#

rtlp_fileop_check() {
	local _rpfc_prefix="${1}" _rpfc_pname="" _rpfc_rname=""; shift;
	return 0;
};

rtlp_fileop_log() {
	rtl_log_msg "fileop" "0;${1}";
};

#
# Public subroutines
#

#
# rtl_fileop() - clean download cache for single package
# @_op:		file operation (one of: cd, chmod, chgrp, chown, cp_follow, cp, install, ln_symbolic, mv, touch, mkdir, mkfifo, rm, source, source_opt, test)
# @...:		file operation arguments
#
# Returns:	zero (0) on success, non-zero (>0) on failure
#
rtl_fileop() {
	local	_rf_op="${1}"					\
		_rf_dst="" _rf_group="" _rf_install_args=""	\
		_rf_mode="" _rf_owner="" _rf_rc=0 _rf_src=""; shift;

	case "${_rf_op}" in

	cd)	if [ \( "${1:+1}" != 1 \) -o ! \( -L "${1}" -o -e "${1}" \) ]; then
			rtl_log_msg "fatalexit" "${MSG_rtl_fileop_invalid_dir}" "${1}";
		elif rtlp_fileop_check "${PREFIX:-}" "${1}"; then
			rtlp_fileop_log "Changing working directory to \`${1}'.";
			cd -- "${1}"; _rf_rc="${?}";
		fi; ;;

	chmod)	if [ "${#}" -lt 2 ]; then
			rtl_log_msg "fatalexit" "${MSG_rtl_fileop_invparm_chmod}" "${*}";
		elif _rf_mode="${1}" && shift\
		&&   rtlp_fileop_check "${PREFIX:-}" "${*}"; then
			rtlp_fileop_log "Changing file mode bits of \`${*}' to \`${_rf_mode}'.";
			chmod -- "${_rf_mode}" "${@}"; _rf_rc="${?}";
		fi; ;;

	chgrp)	if [ "${#}" -lt 2 ]; then
			rtl_log_msg "fatalexit" "${MSG_rtl_fileop_invparm_chgrp}" "${*}";
		elif _rf_group="${1}" && shift\
		&&   rtlp_fileop_check "${PREFIX:-}" "${*}"; then
			rtlp_fileop_log "Changing file group of \`${*}' to \`${_rf_group}'.";
			chgrp -- "${_rf_group}" "${@}"; _rf_rc="${?}";
		fi; ;;

	chown)	if [ "${#}" -lt 2 ]; then
			rtl_log_msg "fatalexit" "${MSG_rtl_fileop_invparm_chown}" "${*}";
		elif _rf_owner="${1}" && shift\
		&&   rtlp_fileop_check "${PREFIX:-}" "${*}"; then
			rtlp_fileop_log "Changing file owner of \`${*}' to \`${_rf_owner}'.";
			chown -- "${_rf_owner}" "${@}"; _rf_rc="${?}";
		fi; ;;

	cp_follow)
		if [ "${#}" -lt 2 ]; then
			rtl_log_msg "fatalexit" "${MSG_rtl_fileop_invparm_cp_follow}" "${*}";
		elif rtlp_fileop_check "${PREFIX:-}" "${*}"; then
			_rf_src="${*}"; _rf_src="${_rf_src% *}";
			_rf_dst="${*}"; _rf_dst="${_rf_dst##* }";
			rtlp_fileop_log "Copying \`${_rf_src}' into \`${_rf_dst}' w/ -pLR.";
			cp -pLR -- "${@}"; _rf_rc="${?}";
		fi; ;;

	cp)	if [ "${#}" -lt 2 ]; then
			rtl_log_msg "fatalexit" "${MSG_rtl_fileop_invparm_cp}" "${*}";
		elif rtlp_fileop_check "${PREFIX:-}" "${*}"; then
			_rf_src="${*}"; _rf_src="${_rf_src% *}";
			_rf_dst="${*}"; _rf_dst="${_rf_dst##* }";
			rtlp_fileop_log "Copying \`${_rf_src}' into \`${_rf_dst}' w/ -pPR.";
			cp -pPR -- "${@}"; _rf_rc="${?}";
		fi; ;;

	install)
		if [ "${#}" -lt 2 ]; then
			rtl_log_msg "fatalexit" "${MSG_rtl_fileop_invparm_install}" "${*}";
		else
			rtl_lindexV \$_rf_dst -1 "${@}";
			rtl_lrangeV \$_rf_install_args 0 1 "${@}";
			rtl_lindexV \$_rf_install_args -2 "${@}";

			if rtlp_fileop_check "${PREFIX:-}" "${_rf_dst}" "${_rf_src}"; then
				rtlp_fileop_log "Installing \`${_rf_src}' into \`${_rf_dst}' w/ ${_rf_install_args}.";
				install "${@}"; _rf_rc="${?}";
			fi;
		fi; ;;

	ln_symbolic)
		if [ \( "${1:+1}" != 1 \) -o \( "${2:+1}" != 1 \) ]; then
			rtl_log_msg "fatalexit" "${MSG_rtl_fileop_invparm_ln_symbolic}" "${*}";
		elif rtlp_fileop_check "${PREFIX:-}" "${2}"; then
			if rtl_fileop test "${2}"; then
				rtl_fileop rm "${2}";
			fi;
			if [ "${?}" -eq 0 ]; then
				rtlp_fileop_log "Linking \`${1}' to \`${2}' w/ -fs";
				ln -fs -- "${1}" "${2}"; _rf_rc="${?}";
			fi;
		fi; ;;

	mv)	if [ \( "${1:+1}" != 1 \) -o \( "${2:+1}" != 1 \) ]; then
			rtl_log_msg "fatalexit" "${MSG_rtl_fileop_invparm_mv}" "${*}";
		elif rtlp_fileop_check "${PREFIX:-}" "${1}" "${2}"; then
			rtlp_fileop_log "Moving \`${1}' to \`${2}' w/ -fs";
			mv -f -- "${1}" "${2}"; _rf_rc="${?}";
		fi; ;;

	touch)	if [ "${1:+1}" != 1 ]; then
			rtl_log_msg "fatalexit" "${MSG_rtl_fileop_invparm_touch}" "${*}";
		elif rtlp_fileop_check "${PREFIX:-}" "${1}"; then
			rtlp_fileop_log "Touching file \`${1}'${2:+ w/ timestamp \`${2}\'}.";
			touch ${2:+-t "${2}"} -- "${1}"; _rf_rc="${?}";
		fi; ;;

	mkdir|mkfifo|rm|source|source_opt|test)
		while [ \( "${?}" -eq 0 \) -a \( ""${#}"" -gt 0 \) ]; do
			if [ "${1:+1}" != 1 ]; then
				rtl_log_msg "fatalexit" "${MSG_rtl_fileop_invparm}" "${_rf_op}" "${*}";
			elif [ "${_rf_op}" = mkdir ]\
			&& [ ! -d "${1}" ]\
			&& rtlp_fileop_check "${PREFIX:-}" "${1}"; then
				if rtl_fileop test "${1}"; then
					rtl_fileop rm "${1}";
				fi;
				rtlp_fileop_log "Making directory \`${1}'.";
				mkdir -p -- "${1}"; _rf_rc="${?}";
			elif [ "${_rf_op}" = mkfifo ]\
			&& rtlp_fileop_check "${PREFIX:-}" "${1}"; then
				if rtl_fileop test "${1}"; then
					rtl_fileop rm "${1}";
				fi;
				rtlp_fileop_log "Creating FIFO \`${1}'.";
				rtlp_fileop_check "${PREFIX:-}" "${1}";
				mkfifo -- "${1}"; _rf_rc="${?}";
			elif [ "${_rf_op}" = rm ]\
			&& rtl_fileop test "${1}"\
			&& rtlp_fileop_check "${PREFIX:-}" "${1}"; then
				rtlp_fileop_log "Removing directory or file \`${1}'.";
				rm -rf -- "${1}"; _rf_rc="${?}";
			elif [ "${_rf_op}" = source ]\
			&& rtlp_fileop_check "${PREFIX:-}" "${1}"; then
				rtlp_fileop_log "Sourcing file \`${1}'.";
				. "${1}"; _rf_rc="${?}";
			elif [ "${_rf_op}" = source_opt ]\
			&& rtl_fileop test "${1}"\
			&& rtlp_fileop_check "${PREFIX:-}" "${1}"; then
				rtlp_fileop_log "Sourcing file \`${1}'.";
				. "${1}"; _rf_rc="${?}";
			elif [ "${_rf_op}" = test ]\
			&& rtlp_fileop_check "${PREFIX:-}" "${1}"\
			&& ! [ \( -L "${1}" \) -o \( -e "${1}" \) ]; then
				return 1;
			fi; shift;
		done; ;;

	*)	rtl_log_msg "fatalexit" "${MSG_rtl_fileop_invparm_fileop}" "${*}"; ;;

	esac;

	return "${_rf_rc}";
};

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