#!/bin/sh -e
# -*- mode: sh; indent-tabs-mode: t -*-
#
# 2020 Dennis Camera (dennis.camera at 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/>.
#

opt_format() {
	printf "%s='%s'\\n" "${1:?'option name missing'}" "${2:?'option value missing'}"
}

opt_from_param() {
	# Only first line will be read.
	opt_format \
		"${1:?'option name missing'}" \
		"$(head -n 1 "${__object:?}/parameter/${2:?'parameter name missing'}")"
}

onchange_action=$(cat "${__object:?}/parameter/onchange")
state=$(cat "${__object:?}/parameter/state")

obj_name="network.${__object_id:?}"

onchange_action() {
	case $onchange_action
	in
		(refresh)
			printf "ifup '%s'\n" "${__object_id:?}"
			;;
		(up)
			# shellcheck disable=SC2016
			echo 'isifup()(up=0; . /usr/share/libubox/jshn.sh && json_load "$(ifstatus "$1")" && json_get_var up up; return $((!up)))'
			printf "isifup '%s' || ifup '%s'\n" "${__object_id:?}" "${__object_id:?}"
			;;
		(down)
			printf "ifdown '%s'\n" "${__object_id:?}"
			;;
		(leave)
			# ignore
			;;
		(*)
			printf 'Invalid --onchange: %s\n' "${onchange_action}" >&2
			exit 1
			;;
	esac
}


set -- --state "${state}" --transaction "${obj_name}"

if test -s "${__object:?}/parameter/comment"
then
	set -- "$@" --option "$(opt_from_param _comment comment)"
fi

if test -f "${__object:?}/parameter/name"
then
	set -- "$@" --option "$(opt_from_param ifname name)"
else
	set -- "$@" --option "$(opt_format ifname "${__object_id:?}")"
fi

set -- "$@" --option "$(opt_format auto "$(
	! test -f "${__object:?}/parameter/onboot"; echo $?)")"
set -- "$@" --option "$(opt_format force_link "$(
	test -f "${__object:?}/parameter/hotplug"; echo $?)")"

# Generate appropriate parameters based on bootproto
bootproto=$(cat "${__object:?}/parameter/bootproto")
case $bootproto
in
	(dhcp)
		set -- "$@" --option "$(opt_format proto dhcp)"
		;;
	(static)
		set -- "$@" --option "$(opt_format proto static)"

		if test -s "${__object:?}/parameter/address"
		then
			while read -r _value
			do
				set -- "$@" --option "$(opt_format ipaddr "${_value}")"
			done <"${__object:?}/parameter/address"
			unset _value
		fi

		if test -s "${__object:?}/parameter/gateway"
		then
			set -- "$@" --option "$(opt_from_param gateway gateway)"
		fi
		;;
	(manual)
		set -- "$@" --option "$(opt_format proto static)"
		;;
	(*)
		exit 1
		;;
esac

if test -s "${__object:?}/parameter/extra-config"
then
	while read -r _opt
	do
		set -- "$@" --option "${_opt}"
	done <"${__object:?}/parameter/extra-config"
	unset _opt
fi

# Instantiate backend type
__uci_section "${obj_name}" --type network.interface "$@"

if test -s "${__object:?}/parameter/onchange"
then
	require=__uci_commit/"${obj_name}" \
	__check_messages "interface_${__object_id:?}_onchange" \
		--pattern "^__uci_commit/network.${__object_id:?}:" \
		--execute "$(onchange_action)"
fi