#
# 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 "${LIBDIR}/replace"
lib_load "${LIBDIR}/strlen"
lib_load "${LIBDIR}/tempfile"

DEFAULT_KEYS_PREFIX="_LIB_KEYS_GRP_"

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

	local group_key
	group_key="${DEFAULT_KEYS_PREFIX}${group}"

	local groupdir
	groupdir=`lib_loaded_var "${group_key}"`

	if [ -n "${groupdir}" ]; then
		return 0
	fi

	local tempdir
	tempdir=`lib_generate_tempdir`

	errlevel=$?
	if [ ${errlevel} -ne 0 ]; then
		exit ${errlevel}
	fi

	local escape_tempdir
	escape_tempdir=`lib_escape_string "${tempdir}"`

	lib_atexit_add "rm -rf \"${escape_tempdir}\" > /dev/null 2>&1"

	setvar ${DEFAULT_KEYS_PREFIX}${group} "${tempdir}"
}

lib_keys_set()
{
	local group="$1" subgroup="$2" key="$3" value="$4"
	if [ -z "${group}" -o -z "${key}" ]; then
		lib_err ${EX_USAGE} "usage: lib_keys_set group subgroup key [value]"
	fi

	local group_key
	group_key="${DEFAULT_KEYS_PREFIX}${group}"

	local groupdir
	groupdir=`lib_loaded_var "${group_key}"`

	if [ -z "${groupdir}" ]; then
		lib_keys_mk "${group}"
		groupdir=`lib_loaded_var "${group_key}"`
	fi

	local subgroupdir
	subgroupdir="${groupdir}/${subgroup}"
	
	mkdir -p -- "${subgroupdir}" || exit $?

	printf "%s\n" "${value}" > "${subgroupdir}/${key}" || exit $?
}

lib_keys_append()
{
	local group="$1" key="$2" value="$3"
	if [ -z "${group}" -o -z "${key}" ]; then
		lib_err ${EX_USAGE} "usage: lib_keys_append group key [value]"
	fi

	local group_key
	group_key="${DEFAULT_KEYS_PREFIX}${group}"

	local groupdir
	groupdir=`lib_loaded_var "${group_key}"`

	local nro
	if [ -z "${groupdir}" ]; then
		nro=0
	else
		nro=`lib_getnro "${groupdir}"`
	fi

	lib_keys_set "${group}" "${nro}" "${key}" "${value}"

	echo "${nro}"
}

lib_keys_list()
{
	local group="$1" subgroup="$2"
	if [ -z "${group}" ]; then
		lib_err ${EX_USAGE} "usage: lib_keys_set group [subgroup]"
	fi

	local groupdir
	groupdir=`lib_keys_getgroupdir "${group}"` || exit $?

	local keysdir="${groupdir}"
	if [ -n "${subgroup}" ]; then
		keysdir="${keysdir}/${subgroup}"
	fi

	if [ ! -d "${keysdir}" ]; then
		lib_err ${EX_NOINPUT} -- "${keysdir}: directory not found."
	fi

	ls -A -- "${keysdir}"
}

lib_keys_get()
{
	local group="$1" subgroup="$2" key="$3"
	if [ -z "${group}" -o -z "${subgroup}" -o -z "${key}" ]; then
		lib_err ${EX_USAGE} "usage: lib_keys_set group subgroup key"
	fi

	local groupdir
	groupdir=`lib_keys_getgroupdir "${group}"` || exit $?

	local keyfile
	keyfile="${groupdir}/${subgroup}/${key}"

	if [ ! -f "${keyfile}" ]; then
		lib_err ${EX_NOINPUT} -- "${key}: key not found."
	fi

	cat -- "${keyfile}" || exit $?
}

lib_keys_check()
{
	local group="$1" entity="$2"
	if [ -z "${group}" -o -z "${entity}" ]; then
		lib_err ${EX_USAGE} "usage: lib_keys_check group entity"
	fi

	local groupdir
	groupdir=`lib_keys_getgroupdir "${group}"` || exit $?

	local entityfile
	entityfile="${groupdir}/${entity}"

	if [ ! -e "${entityfile}" ]; then
		return 1
	fi

	return 0
}

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

	local group_key
	group_key="${DEFAULT_KEYS_PREFIX}${group}"

	local groupdir
	groupdir=`lib_loaded_var "${group_key}"`

	if [ -z "${groupdir}" ]; then
		lib_err ${EX_NOINPUT} -- "${group}: group not found."
	fi

	printf "%s\n" "${groupdir}"
}
