#
# Copyright (c) 2022-2023, Jesús Daniel Colmenares Oviedo <DtxdF@disroot.org>
# All rights reserved.
#
# Redistribution and use in source and binary forms, with or without
# modification, are permitted provided that the following conditions are met:
#
# * Redistributions of source code must retain the above copyright notice, this
#   list of conditions and the following disclaimer.
#
# * Redistributions in binary form must reproduce the above copyright notice,
#   this list of conditions and the following disclaimer in the documentation
#   and/or other materials provided with the distribution.
#
# * Neither the name of the copyright holder nor the names of its
#   contributors may be used to endorse or promote products derived from
#   this software without specific prior written permission.
#
# THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
# AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
# IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
# DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
# FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
# DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
# SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
# CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
# OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
# OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.

lib_load "${LIBDIR}/colors"

LOG_DEBUG="debug"
LOG_ERROR="error"
LOG_WARN="warn"
LOG_INFO="info"

lib_log()
{
	local _o
	local errlevel
	local current_color
	local current_seconds
	local pretty_elapsed
	local echo_cmd="echo"
	local spaces=

	errlevel="$1"; shift

	if [ -z "${errlevel}" ]; then
		lib_log ${LOG_ERROR} "usage: lib_log errlevel [-e] -- message ..."
		exit ${EX_USAGE}
	fi

	case "${errlevel}" in
		${LOG_DEBUG})
			current_color="${COLOR_DEBUG}"
			;;
		${LOG_ERROR})
			current_color="${COLOR_ERROR}"
			;;
		${LOG_INFO})
			current_color="${COLOR_INFO}"
			spaces=" "
			;;
		${LOG_WARN})
			current_color="${COLOR_WARN}"
			spaces=" "
			;;
		*)
			lib_err ${EX_DATAERR} "Invalid log level: ${errlevel}"
			;;
	esac

	while getopts ":e" _o; do
		case "${_o}" in
			e)
				echo_cmd="echo -e"
				;;
		esac
	done
	shift $((OPTIND-1))

	lib_init_logtime

	current_seconds=`date +"%s"`
	current_seconds=$((current_seconds-AJ_LOG_INIT_TIME))

	pretty_elapsed=`printf "%02d:%02d:%02d" $((current_seconds/3600)) $((current_seconds%3600/60)) $((current_seconds%60))`

	echo -n "`echo -e "${current_color}[${pretty_elapsed}]${COLOR_DEFAULT} [ ${current_color}${errlevel}${COLOR_DEFAULT}${spaces} ]${AJ_LOG_PREFIX}"`" >&2
	${echo_cmd} " $@" >&2
}

lib_init_logtime()
{
	AJ_LOG_INIT_TIME=`printenv AJ_LOG_INIT_TIME`
	if [ -z "${AJ_LOG_INIT_TIME}" ]; then
		# For scripts (SCRIPTSDIR/*.sh) and related tools.
		export AJ_LOG_INIT_TIME=`date +"%s"`
	fi
}

lib_set_logprefix()
{
	export AJ_LOG_PREFIX="$1"
}

lib_debug()
{
	if [ "${ENABLE_DEBUG}" = "0" ]; then
		return 0
	fi

	lib_log ${LOG_DEBUG} "$@"
}

lib_err()
{
	local errcode="$1"; shift

	if [ -z "${errcode}" ]; then
		lib_err ${EX_USAGE} "usage: lib_err [errcode | -] message ..."
	fi

	lib_log ${LOG_ERROR} "$@"

	if [ "${errcode}" != "-" ]; then
		exit ${errcode}
	fi
}

lib_warn()
{
	lib_log ${LOG_WARN} "$@"
}

lib_info()
{
	lib_log ${LOG_INFO} "$@"
}

lib_debug_read()
{
	local file="$1"
	if [ -z "${file}" ]; then
		lib_err ${EX_USAGE} "usage: lib_debug_read file"
	fi

	if [ ${ENABLE_DEBUG} = "0" ]; then
		return
	fi

	local line
	while IFS= read -r line; do
		lib_debug "    ${line}"
	done < "${file}"
}
