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

#
# Private globals
#

RTLP_LOG_FNAME="";
RTLP_LOG_NO_ATTR=0;
RTLP_LOG_TAGS="";
RTLP_LOG_TERMINAL_COLOURS="$(tput colors 2>/dev/null)";

#
# Private subroutines
#

#
# rtlp_log_msg_get_attr() - get attributes e.g. ANSI escape sequences for single log tag
# @_rattr:	out reference to attributes e.g. ANSI escape sequences
# @_tag:	tag to log message at
#
# Returns:	zero (0) on success, non-zero (>0) on failure
#
rtlp_log_msg_get_attr() {
	local	_rplmga_rattr="${1#\$}" _rplmga_tag="${2}"	\
		_rplmga_attr="" _rplmga_attr_state=""		\
		_rplmga_term_colour=0;

	if [ "${RTLP_LOG_TERMINAL_COLOURS}" = 256 ]; then
		set -- 256 "";
	else
		set -- "";
	fi;

	for _rplmga_term_colour in "${@}"; do
		eval _rplmga_attr='${LOG_TAG_'"${_rplmga_tag}${_rplmga_term_colour:+_${_rplmga_term_colour}}"':-}';

		if [ "${_rplmga_attr:+1}" = 1 ]; then
			break;
		else
			eval _rplmga_attr_state='${RTLP_ATTR_STATE_'"${_rplmga_tag}"':-}';
			if [ "${_rplmga_attr_state:+1}" != 1 ]; then
				_rplmga_attr_state=0;
			else
				: $((_rplmga_attr_state += 1));
			fi;
			eval "RTLP_ATTR_STATE_${_rplmga_tag}=${_rplmga_attr_state}";

			if [ "$((${_rplmga_attr_state} % 2))" -eq 0 ]; then
				eval _rplmga_attr='${LOG_TAG_'"${_rplmga_tag}"'_even'"${_rplmga_term_colour:+_${_rplmga_term_colour}}"':-}';
			else
				eval _rplmga_attr='${LOG_TAG_'"${_rplmga_tag}"'_odd'"${_rplmga_term_colour:+_${_rplmga_term_colour}}"':-}';
			fi;

			if [ "${_rplmga_attr:+1}" = 1 ]; then
				break;
			fi;
		fi;
	done;

	eval ${_rplmga_rattr}='${_rplmga_attr}';
	return 0;
};

#
# rtlp_log_printfV() - print single message to log file
# @_attr:	attributes e.g. ANSI escape sequences to log message with
# @_fmt_pfx:	printf(1) format string prefix
# @_fmt:	printf(1) format string
# @...:		parameters to printf(1) w/ @_fmt
#
# Returns:	zero (0) on success, non-zero (>0) on failure
#
rtlp_log_printfV() {
	local	_rplp_attr="${1}" _rplp_fmt_pfx="${2}"	\
		_rplp_fmt="${3#*;}" _rplp_fmt_argc="${3%%;*}";
	shift 3;

	if [ "${#}" -ne "${_rplp_fmt_argc}" ]; then
		if [ "${_rplp_fmt_argc}" -eq 0 ]; then
			shift "${#}";
		else
			rtlp_log_printfV "" "" "0;==> FIXME TODO XXX MESSAGE STRING ARGUMENT COUNT MISMATCH\n";
		fi;
	fi;
	_rplp_msg="$(printf "${_rplp_fmt_pfx}${_rplp_fmt}" "${@}")";

	if [ "${RTLP_LOG_FNAME:+1}" = 1 ]; then
		printf "%s\n" "${_rplp_msg}" >> "${RTLP_LOG_FNAME}";
	fi;
	if [ "${RTLP_LOG_NO_ATTR:-0}" -eq 0 ]; then
		printf "\033[0m\033[${_rplp_attr}m%s\033[0m\n" "${_rplp_msg}";
	else
		printf "%s\n" "${_rplp_msg}";
	fi;
	return 0;
};

#
# Public subroutines
#

#
# rtl_log_clear_tags() - clear all log tags
#
# Returns:	zero (0) on success, non-zero (>0) on failure
#
rtl_log_clear_tags() {
	RTLP_LOG_TAGS="";
	return 0;
};

#
# rtl_log_enable_tagsV() - enable log tags
# @...:		list of tags to enable as positional parameters
#
# Returns:	zero (0) on success, non-zero (>0) on failure
#
rtl_log_enable_tagsV() {
	local IFS=","; set -- ${*};

	while [ "${#}" -gt 0 ]; do
		if ! rtl_lmatch \$RTLP_LOG_TAGS "${1}" ","; then
			RTLP_LOG_TAGS="${RTLP_LOG_TAGS:+${RTLP_LOG_TAGS},}${1}";
		fi; shift;
	done;
	return 0;
};

#
# rtl_log_env_vars() - log all environment variables to log file
# @_tag:	tag to log environment variables at
# @_type:	type string printed in log message header
#
# Returns:	zero (0) on success, non-zero (>0) on failure
#
rtl_log_env_vars() {
	local	_rlev_tag="${1}" _rlev_type="${2}"	\
		_rlev_arg_len_max=0 _rlev_list="" _rlev_msg="" _rlev_msg_="";
	shift 2;

	rtl_log_msgV "${_rlev_tag}" "${MSG_rtl_log_vars_header}" "${_rlev_type}";
	_rlev_list="${@}"; rtl_lmax \$_rlev_list \$_rlev_arg_len_max;
	while [ "${#}" -gt 0 ]; do
		rtl_get_var_unsafe \$_rlev_msg "${1#*=}";
		rtl_llift2 \$_rlev_msg \$_rlev_msg_ "" " ";
		rtl_log_msgV "${_rlev_tag}"					\
			"2;%${_rlev_arg_len_max}.${_rlev_arg_len_max}s=%s"	\
			"${1%%=*}" "${_rlev_msg_}";
		shift;
	done;
	return 0;
};

#
# rtl_log_msgV() - log message to log file
# @_tag:	tag to log message at
# @_fmt:	printf(1) format string
# @...:		parameters to printf(1) w/ @_fmt
#
# Returns:	zero (0) on success, non-zero (>0) on failure
# N.B.:		Optional attributes e.g. ANSI escape sequences w/ which the the log message is to
#		be printed are taken from the variable corresponding to @_tag named "LOG_TAG_<@_tag>",
#		if present/set.
#
#		@_tag must have previously been enabled w/ rtl_log_enable_tagsV() to be logged at all.
#
rtl_log_msgV() {
	local	_rlm3_tag="${1}" _rlm3_fmt="${2}"	\
		_rlm3_attr="" _rlm3_date_now=0 _rlm3_exitfl=0
	shift 2;

	if [ "x${_rlm3_tag}" = "xfatalexit" ]; then
		_rlm3_tag="fatal"; _rlm3_exitfl=1;
	fi;

	if [ "${_rlm3_tag}" = "fatal" ]\
	|| rtl_lmatch \$RTLP_LOG_TAGS "${_rlm3_tag}" ",";
	then
		rtlp_log_msg_get_attr \$_rlm3_attr "${_rlm3_tag}";
		rtl_date \$_rlm3_date_now;
		rtlp_log_printfV "${_rlm3_attr}" "==> ${_rlm3_date_now} " "${_rlm3_fmt}" "${@}";
		if [ "${_rlm3_exitfl}" -eq 1 ]; then
			exit 1;
		fi;
	fi;
	return 0;
};

#
# rtl_log_set_fname() - set log file pathname
# @_fname:	pathname to new log file
#
# Returns:	zero (0) on success, non-zero (>0) on failure
#
rtl_log_set_fname() {
	RTLP_LOG_FNAME="${1}";
	return 0;
};

#
# rtl_log_set_no_attr() - set or clear no ANSI escape sequences in log file flag
# @_flag:	either 0 to set or 1 to clear no ANSI escape sequences in log file flag
#
# Returns:	zero (0) on success, non-zero (>0) on failure
#
rtl_log_set_no_attr() {
	RTLP_LOG_NO_ATTR="${1}";
	return 0;
};

# vim:filetype=sh textwidth=0