#!/bin/sh /etc/rc.common
#
# Copyright (C) 2022 TDT AG <development@tdt.de>
#
# This is free software, licensed under the GNU General Public License v2.
# See https://www.gnu.org/licenses/gpl-2.0.txt for more information.

START=85
STOP=25

USE_PROCD=1

#radioconf
DEFAULT_COMIF='usb'
DEFAULT_DEVPATH='/dev/ttyACM0'
DEFAULT_PPS=0
DEFAULT_PUBLIC=1
DEFAULT_CLKSRC=0
DEFAULT_RADIO_0='rfconf0'
DEFAULT_RADIO_1='rfconf1'

#rfconf
DEFAULT_TYPE='SX1250'
DEFAULT_TX_ENABLE=0
DEFAULT_FREQ=0
DEFAULT_RSSI_OFFSET=0
DEFAULT_ANTENNA_GAIN=0
DEFAULT_RSSI_TCOMP='std'

#rssi tcomp
DEFAULT_RSSI_TCOMP_A=0
DEFAULT_RSSI_TCOMP_B=0
DEFAULT_RSSI_TCOMP_C=20.41
DEFAULT_RSSI_TCOMP_D=2162.56
DEFAULT_RSSI_TCOMP_E=0

#tx gain lut
DEFAULT_RF_POWER=0
DEFAULT_PA_GAIN=0
DEFAULT_PWR_IDX=0

#station
DEFAULT_RADIO_INIT=''
DEFAULT_ID_GEN_IF='eth0'
DEFAULT_ROUTER_ID='/sys/class/net/eth0/address'
DEFAULT_LOG_FILE='/tmp/basicstation/log'
DEFAULT_LOG_LEVEL='DEBUG'
DEFAULT_LOG_SIZE=1
DEFAULT_LOG_ROTATE=1

#auth
DEFAULT_CREDENTIALS='tc'
DEFAULT_MODE='no'

parse_txlut() {
	local section="$1"
	local buffer

	config_get buffer "$section" usedBy

	if [[ "$buffer" == *"$2"* ]]; then
		json_add_object

		config_get buffer "$section" rfPower "$DEFAULT_RF_POWER"
		json_add_int 'rf_power' "$buffer"
		config_get_bool buffer "$section" paGain "$DEFAULT_PA_GAIN"
		json_add_int 'pa_gain' "$buffer"
		config_get buffer "$section" pwrIdx "$DEFAULT_PWR_IDX"
		json_add_int 'pwr_idx' "$buffer"

		json_close_object
	fi
}

parse_rssitcomp() {
	local section="$1"
	local buffer

	if [ "$section" = "$2" ]; then
		json_add_object 'rssi_tcomp'

		config_get buffer "$section" coeff_a "$DEFAULT_RSSI_TCOMP_A"
		json_add_double 'coeff_a' "$buffer"
		config_get buffer "$section" coeff_b "$DEFAULT_RSSI_TCOMP_B"
		json_add_double 'coeff_b' "$buffer"
		config_get buffer "$section" coeff_c "$DEFAULT_RSSI_TCOMP_C"
		json_add_double 'coeff_c' "$buffer"
		config_get buffer "$section" coeff_d "$DEFAULT_RSSI_TCOMP_D"
		json_add_double 'coeff_d' "$buffer"
		config_get buffer "$section" coeff_e "$DEFAULT_RSSI_TCOMP_E"
		json_add_double 'coeff_e' "$buffer"

		json_close_object
	fi
}

parse_rfconf() {
	local section="$1"
	local buffer

	if [ "$section" = "$2" ]; then
		json_add_object "radio_"$3""

		config_get buffer "$section" type "$DEFAULT_TYPE"
		json_add_string 'type' "$buffer"
		config_get buffer "$section" freq "$DEFAULT_FREQ"
		json_add_int 'freq' "$buffer"
		config_get buffer "$section" antennaGain "$DEFAULT_ANTENNA_GAIN"
		json_add_int 'antenna_gain' "$buffer"
		config_get buffer "$section" rssiOffset "$DEFAULT_RSSI_OFFSET"
		json_add_double 'rssi_offset' "$buffer"
		config_get buffer "$section" useRssiTcomp "$DEFAULT_RSSI_TCOMP"
		config_foreach parse_rssitcomp rssitcomp "$buffer"
		config_get_bool buffer "$section" txEnable "$DEFAULT_TX_ENABLE"
		json_add_boolean 'tx_enable' "$buffer"

		if [ "$buffer" -eq 1 ]; then
			json_add_array 'tx_gain_lut'
			config_foreach parse_txlut txlut "$section"
			json_close_array
		fi

		json_close_object
	fi
}

parse_sx130x() {
	local section="$1"
	local comif
	local devpath
	local buffer

	json_add_object 'radio_conf'

	config_get comif "$section" comif "$DEFAULT_COMIF"
	config_get devpath "$section" devpath "$DEFAULT_DEVPATH"
	json_add_string 'device' ""$comif":"$devpath""
	config_get_bool buffer "$section" pps "$DEFAULT_PPS"
	json_add_boolean 'pps' "$buffer"
	config_get_bool buffer "$section" public "$DEFAULT_PUBLIC"
	json_add_boolean 'lorawan_public' "$buffer"
	config_get buffer "$section" clksrc "$DEFAULT_CLKSRC"
	json_add_int 'clksrc' "$buffer"
	json_add_boolean 'full_duplex' 0
	config_get buffer "$section" radio0 "$DEFAULT_RADIO_0"
	config_foreach parse_rfconf rfconf "$buffer" 0
	config_get buffer "$section" radio1 "$DEFAULT_RADIO_1"
	config_foreach parse_rfconf rfconf "$buffer" 1

	json_close_object
}

parse_station() {
	local section="$1"
	local buffer
	local mac

	config_get buffer "$section" idGenIf "$DEFAULT_ID_GEN_IF"
	mac=$(head -n 1 /sys/class/net/"$buffer"/address)
	uci_set basicstation "$section" stationid "${mac::8}:ff:fe:${mac:9:8}"
	uci_commit basicstation

	json_add_object 'station_conf'

	config_get buffer "$section" routerid "$DEFAULT_ROUTER_ID"
	json_add_string 'routerid' "$buffer"
	config_get buffer "$section" radioInit "$DEFAULT_RADIO_INIT"
	json_add_string 'radio_init' "$buffer"
	config_get buffer "$section" logFile "$DEFAULT_LOG_FILE"
	json_add_string 'log_file' "$buffer"
	config_get buffer "$section" logLevel "$DEFAULT_LOG_LEVEL"
	json_add_string 'log_level' "$buffer"
	config_get buffer "$section" logSize "$DEFAULT_LOG_SIZE"
	json_add_int 'log_size' $(( 1000000*buffer ))
	config_get buffer "$section" logRotate "$DEFAULT_LOG_ROTATE"
	json_add_int 'log_rotate' "$buffer"

	json_close_object
}

parse_auth() {
	local section="$1"
	local cred
	local mode
	local addr
	local port
	local uri
	local buffer

	config_get cred "$section" cred "$DEFAULT_CREDENTIALS"
	config_get mode "$section" mode "$DEFAULT_MODE"
	config_get addr "$section" addr
	config_get port "$section" port

	if [ "$mode" != 'no' ]; then
		config_get buffer "$section" trust
		[ -f "$buffer" ] && cp "$buffer" /tmp/basicstation/"$cred".trust
		if [ "$mode" = 'serverAndClient' ]; then
			config_get buffer "$section" key
			echo "$buffer" > /tmp/basicstation/"$cred".key
			config_get buffer "$section" crt
			[ -f "$buffer" ] && cp "$buffer" /tmp/basicstation/"$cred".crt
		elif [ "$mode" = 'serverAndClientToken' ]; then
			config_get buffer "$section" token
			echo "$buffer" > /tmp/basicstation/"$cred".key
		fi
		if [ "$cred" = "tc" ]; then
			uri="wss://${addr}:${port}"
		else
			uri="https://${addr}:${port}"
		fi
	else
		if [ "$cred" = "tc" ]; then
			uri="ws://${addr}:${port}"
		else
			uri="http://${addr}:${port}"
		fi
	fi

	echo "$uri" > /tmp/basicstation/"$cred".uri
}

process_config() {
	. /usr/share/libubox/jshn.sh
	json_init

	config_load basicstation
	config_foreach parse_sx130x sx130x
	config_foreach parse_station station
	json_dump -i > /tmp/basicstation/station.conf
	config_foreach parse_auth auth
}

service_triggers() {
	procd_add_reload_trigger "basicstation"
}

start_service() {
	rm -rf /tmp/basicstation/
	mkdir -p /tmp/basicstation/

	process_config

	procd_open_instance
	procd_set_param command /usr/bin/station
	procd_append_param command --home /tmp/basicstation/
	procd_append_param command --force
	procd_set_param respawn
	procd_close_instance
}

reload_service() {
	restart "$@"
}