#!/bin/sh -e
#
# 2020 Dennis Camera (dennis.camera@ssrq-sds-fds.ch)
#
# This file is part of cdist.
#
# cdist is free software: you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation, either version 3 of the License, or
# (at your option) any later version.
#
# cdist is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with cdist. If not, see <http://www.gnu.org/licenses/>.
#

in_list() { printf '%s\n' "$@" | { grep -qxF "$(read -r NDL; echo "${NDL}")"; } }

config=${__object_id:?}

state_is=$(cat "${__object:?}/explorer/state")
state_should=$(cat "${__object:?}/parameter/state")

case ${state_should}
in
	(present)
		if in_list "${state_is}" 'present' 'rearranged'
		then
			# NOTE: order is ignored so rearranged is also fine.
			exit 0
		fi

		if test "$(wc -l "${__object:?}/parameter/value")" -gt 1
		then
			# "should" is a list
			if test "${state_is}" != 'absent'
			then
				printf "uci delete '%s'\n" "${config}"
			fi

			while read -r value
			do
				printf "uci add_list '%s'='%s'\n" "${config}" "${value}"
			done <"${__object:?}/parameter/value"
		else
			# "should" is a scalar
			value=$(cat "${__object:?}/parameter/value")
			printf "uci set '%s'='%s'\n" "${config}" "${value}"
		fi
		;;
	(absent)
		if in_list "${state_is}" 'absent'
		then
			exit 0
		fi

		printf "uci delete '%s'\n" "${config}"
		;;
	(*)
		printf 'Invalid --state: %s\n' "${state_should}" >&2
		exit 1
		;;
esac