#!/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/>.
#

# shellcheck source=cdist/conf/type/__uci_section/files/functions.sh
. "${__type:?}/files/functions.sh"


section=$(cat "${__object:?}/explorer/match")

state_is=$(test -s "${__object:?}/explorer/type" && echo present || echo absent)
state_should=$(cat "${__object:?}/parameter/state")

case $state_should
in
	(present)
		test -f "${__object:?}/parameter/type" || {
			echo 'Parameter --type is required.' >&2
			exit 1
		}

		type_is=$(cat "${__object:?}/explorer/type")
		type_should=$(cat "${__object:?}/parameter/type")

		if test -n "${type_is}"
		then
			sect_type=${type_is}
		else
			sect_type=${type_should##*.}
		fi

		if test -z "${section}"
		then
			# No section exists and --match was used.
			# So we generate a new section identifier from $__object_id.
			case ${__object_id:?}
			in
				(*.*) section=${__object_id:?} ;;
				(*) section="${type_should%%.*}.${__object_id:?}" ;;
			esac
		fi

		# Collect option names
		if test -f "${__object:?}/parameter/list"
		then
			listnames_should=$(
				sed -e 's/=.*$//' "${__object:?}/parameter/list" | sort -u)
		fi

		if test -f "${__object:?}/parameter/option"
		then
			optnames_should=$(
				sed -e 's/=.*$//' "${__object:?}/parameter/option" | sort -u)
		fi

		# Make sure the section itself is present
		if test "${state_is}" = absent \
			|| test "${type_is}" != "${type_should#*.}"
		then
			printf 'set %s\n' "${section}" >>"${__messages_out:?}"
			# shellcheck disable=SC2140
			uci_cmd set "${section}"="${sect_type}"
		fi

		# Delete options/lists not in "should"
		sed -e 's/=.*$//' "${__object:?}/explorer/options" \
		| while read -r _optname
		  do
			  grep_line "${_optname}" "${listnames_should}" "${optnames_should}" || {
				  printf 'delete %s\n' "${section}.${_optname}" >>"${__messages_out:?}"
				  uci_cmd delete "${section}.${_optname}"
			  } </dev/null
		  done

		opt_proc_error() {
			printf 'An error occurred during processing of option %s\n' "${1:?}" >&2
			exit 1
		}

		# Set "should" options
		echo "${optnames_should}" \
		| grep -e . \
		| while read -r _optname
		  do
			  _opt_state=$(awk -f "${__type:?}/files/option_state.awk" option "${_optname}") \
				  || opt_proc_error "${_optname}"
			  case ${_opt_state}
			  in
				  (invalid)
					  opt_proc_error "${_optname}"
					  ;;
				  (present)
					  ;;
				  (*)
					  printf 'set %s\n' "${section}.${_optname}" >>"${__messages_out:?}"

					  # shellcheck disable=SC2140
					  uci_cmd set "${section}.${_optname}"="$(
						  grep -e "^${_optname}=" "${__object:?}/parameter/option" \
						  | sed -e 's/^.*=//' \
						  | unquote_lines \
						  | head -n 1)"
					  ;;
			  esac
		  done

		echo "${listnames_should}" \
		| grep -e . \
		| while read -r _optname
		  do
			  _list_state=$(awk -f "${__type:?}/files/option_state.awk" list "${_optname}") \
				  || opt_proc_error "${_optname}"
			  case ${_list_state}
			  in
				  (invalid)
					  opt_proc_error "${_optname}"
					  ;;
				  (present)
					  ;;
				  (*)
					  printf 'set_list %s\n' "${section}.${_optname}" >>"${__messages_out:?}"

					  if test "${_list_state}" != absent
					  then
						  uci_cmd delete "${section}.${_optname}"
					  fi

					  grep "^${_optname}=" "${__object:?}/parameter/list" \
					  | sed -e 's/^.*=//' \
					  | unquote_lines \
					  | while read -r _value
					    do
						    # shellcheck disable=SC2140
						    uci_cmd add_list "${section}.${_optname}"="${_value}"
					    done
					  ;;
			  esac
		  done
		;;
	(absent)
		if test "${state_is}" = absent
		then
			# if explorer found no section there is nothing to delete
			exit 0
		fi

		printf 'delete %s\n' "${section}" >>"${__messages_out:?}"
		uci_cmd delete "${section}"
		;;
esac

if test -s "${__object:?}/files/uci_batch.txt"
then
	cat "${__type:?}/files/uci_apply.sh"
	printf "uci_apply <<'EOF'\n"
	cat "${__object:?}/files/uci_batch.txt"
	printf '\nEOF\n'
fi