#!/bin/sh /etc/rc.common
# Copyright (c) 2016-2021 Dirk Brenken (dev@brenken.org)
# This is free software, licensed under the GNU General Public License v3.

# set (s)hellcheck exceptions
# shellcheck disable=2034,2086,2154,3043,3060

START=25
USE_PROCD=1

extra_command "scan" "[<radio>|<ifname>] Scan for available nearby uplinks"
extra_command "assoc" "[<radio>|<ifname>] Get MAC adresses of associated wlan stations"
extra_command "setup" "[<iface>] [<zone>] [<metric>] Setup the travelmate uplink interface, by default 'trm_wwan' with firewall zone 'wan' and metric '100'"

trm_init="/etc/init.d/travelmate"
trm_script="/usr/bin/travelmate.sh"
trm_pidfile="/var/run/travelmate.pid"

boot() {
	if [ -s "${trm_pidfile}" ]; then
		: >"${trm_pidfile}"
	fi
	rc_procd start_service
}

start_service() {
	if "${trm_init}" enabled; then
		if [ "${action}" = "boot" ]; then
			return 0
		fi
		procd_open_instance "travelmate"
		procd_set_param command "${trm_script}" "${@}"
		procd_set_param pidfile "${trm_pidfile}"
		procd_set_param nice "$(uci_get travelmate global trm_nice "0")"
		procd_set_param stdout 1
		procd_set_param stderr 1
		procd_close_instance
	fi
}

reload_service() {
	local ppid pid timeout

	timeout="$(uci_get travelmate global trm_timeout)"

	if [ -s "${trm_pidfile}" ]; then
		ppid="$(cat "${trm_pidfile}" 2>/dev/null)"
		if [ -n "${ppid}" ]; then
			pid="$(pgrep -xnf "sleep ${timeout:-60} 0" -P ${ppid} 2>/dev/null)"
			if [ -n "${pid}" ]; then
				kill -INT ${pid} 2>/dev/null
			fi
		fi
	fi
}

stop_service() {
	rc_procd "${trm_script}" stop
}

status_service() {
	local key keylist value rtfile

	rtfile="$(uci_get travelmate global trm_rtfile "/tmp/trm_runtime.json")"
	json_load_file "${rtfile}" >/dev/null 2>&1
	if json_select data >/dev/null 2>&1; then
		printf "%s\n" "::: travelmate runtime information"
		json_get_keys keylist
		for key in ${keylist}; do
			json_get_var value "${key}"
			printf "  + %-18s : %s\n" "${key}" "${value}"
		done
	else
		printf "%s\n" "::: no travelmate runtime information available"
	fi
}

scan() {
	local result scan_name radio="${1}"

	if [ -z "${radio}" ]; then
		scan_name="$(ubus -S call network.wireless status 2>/dev/null | jsonfilter -q -l1 -e '@[@.up=true].interfaces[0].ifname')"
	fi
	result="$(iwinfo "${radio:-${scan_name}}" scan 2>/dev/null |
		awk 'BEGIN{FS="[[:space:]]"}/Address:/{var1=$NF}/ESSID:/{var2="";
		for(i=12;i<=NF;i++)if(var2==""){var2=$i}else{var2=var2" "$i}}/Channel:/{var3=$NF}/Quality:/{split($NF,var0,"/")}/Encryption:/{var4="";
		for(j=12;j<=NF;j++)if(var4==""){var4=$j}else{var4=var4" "$j};printf "    %-11i%-10s%-35s%-20s%s\n",(var0[1]*100/var0[2]),var3,var2,var1,var4}' |
		sort -rn)"
	printf "%s\n" "::: Available nearby uplinks on '${radio:-${scan_name}}'"
	printf "%s\n" ":::"
	if [ -n "${result}" ]; then
		printf "%-15s%-10s%-35s%-20s%s\n" "    Strength" "Channel" "ESSID" "BSSID" "Encryption"
		printf "%s\n" "    --------------------------------------------------------------------------------------"
		printf "%s\n" "${result}"
	else
		printf "%s\n" "::: Empty resultset"
	fi
}

setup() {
	local iface cnt=0 input="${1:-"trm_wwan"}" zone="${2:-"wan"}" metric="${3:-"100"}"

	iface="$(uci_get travelmate global trm_iface)"
	input="${input//[+*~%&\$@\"\' ]/}"
	zone="${zone//[+*~%&\$@\"\' ]/}"
	metric="${metric//[^0-9]/}"

	if [ -n "${iface}" ] && [ "${iface}" = "${input}" ]; then
		printf "%s\n" "The uplink interface '${input}' has been already configured"
	elif [ -n "${input}" ]; then
		if [ -n "${iface}" ]; then
			uci -q batch <<-EOC
				del network."${iface}"
				del network."${iface}6"
			EOC
		fi
		uci -q batch <<-EOC
			set travelmate.global.trm_enabled="1"
			set travelmate.global.trm_iface="${input}"
			set network."${input}"="interface"
			set network."${input}".proto="dhcp"
			set network."${input}".metric="${metric}"
			set network."${input}6"=interface
			set network."${input}6".device="@${input}"
			set network."${input}6".proto="dhcpv6"
			commit travelmate
			commit network
		EOC

		while [ -n "$(uci -q get firewall.@zone["${cnt}"].name)" ]; do
			if [ "$(uci -q get firewall.@zone["${cnt}"].name)" = "${zone}" ]; then
				if [ -n "${iface}" ]; then
					uci -q batch <<-EOC
						del_list firewall.@zone["${cnt}"].network="${iface}"
						del_list firewall.@zone["${cnt}"].network="${iface}6"
					EOC
				fi
				uci -q batch <<-EOC
					add_list firewall.@zone["${cnt}"].network="${input}"
					add_list firewall.@zone["${cnt}"].network="${input}6"
					commit firewall
				EOC
				break
			fi
			cnt=$((cnt + 1))
		done

		if [ -n "${iface}" ]; then
			cnt=0
			while [ -n "$(uci -q get wireless.@wifi-iface["${cnt}"].network)" ]; do
				if [ "$(uci -q get wireless.@wifi-iface["${cnt}"].network)" = "${iface}" ]; then
					uci -q set wireless.@wifi-iface["${cnt}"].network="${input}"
				fi
				cnt=$((cnt + 1))
			done
			uci -q commit wireless
		fi
		/etc/init.d/network reload >/dev/null 2>&1
		/etc/init.d/firewall reload >/dev/null 2>&1
		"${trm_init}" restart
	fi
}

assoc() {
	local result assoc_name radio="${1}"

	if [ -z "${radio}" ]; then
		assoc_name="$(ubus -S call network.wireless status 2>/dev/null | jsonfilter -q -l1 -e '@[@.*.*.config.mode="ap"].interfaces[0].ifname')"
	fi
	result="$(iwinfo "${radio:-${assoc_name}}" assoc 2>/dev/null | awk '/^[A-Z0-9:]+/{printf "    %s\n",$1}')"
	printf "%s\n" "::: Associated wlan stations on '${radio:-${assoc_name}}'"
	printf "%s\n" ":::"
	if [ -n "${result}" ]; then
		printf "%s\n" "    MAC addresses"
		printf "%s\n" "    -----------------"
		printf "%s\n" "${result}"
	else
		printf "%s\n" "::: Empty resultset"
	fi
}

service_triggers() {
	local iface delay

	iface="$(uci_get travelmate global trm_iface)"
	delay="$(uci_get travelmate global trm_triggerdelay "2")"
	PROCD_RELOAD_DELAY=$((delay * 1000))

	if [ -n "${iface}" ]; then
		procd_add_interface_trigger "interface.*.down" "${iface}" "${trm_init}" reload
	fi
	procd_add_raw_trigger "interface.*.up" "${PROCD_RELOAD_DELAY}" "${trm_init}" start
	procd_add_config_trigger "config.change" "travelmate" "${trm_init}" restart
}