#!/bin/bash

NAME="ttn-packet-forwarder"
ENABLED="yes"

[ -f /etc/default/$NAME ] && source /etc/default/$NAME

conf_dir=/var/config/lora
run_dir=/var/run
pkt_fwd=/opt/lora/run_forwarder
pkt_fwd_pidfile_1=$run_dir/lora-pkt-fwd-1.pid
pkt_fwd_pidfile_2=$run_dir/lora-pkt-fwd-2.pid

port1=/sys/devices/platform/mts-io/ap1
port2=/sys/devices/platform/mts-io/ap2

lora_mtac_id="MTAC-LORA"
lora_1_0_hw="MTAC-LORA-1.0"
lora_1_5_h_hw="MTAC-LORA-1.5"

read_card_info() {
    # product-id of first lora card
    lora_id=$(mts-io-sysfs show lora/product-id 2> /dev/null)
    
    # Get EUI from both cards
    lora_eui_1=$(mts-io-sysfs show ap1/eui 2> /dev/null)
    lora_eui_2=$(mts-io-sysfs show ap2/eui 2> /dev/null)
    
    # remove all colons
    lora_eui_raw_1=${lora_eui_1//:/}
    lora_eui_raw_2=${lora_eui_2//:/}
    
    lora_hw=$(mts-io-sysfs show lora/hw-version 2> /dev/null)

    if [ -d $port1 ] && [[ $(cat $port1/hw-version) = $lora_hw ]]; then
        ln -sf /dev/spidev32766.2 /dev/spidev0.0
    elif [ -d $port2 ] && [[ $(cat $port2/hw-version) = $lora_hw ]]; then
        ln -sf /dev/spidev32765.2 /dev/spidev0.0
    fi
}

do_start() {
    read_card_info

    if [ "$lora_hw" = "$lora_1_0_hw" ] ; then
	rm -rf /opt/lora/mp_pkt_fwd > /dev/null 2>&1
	ln -s /opt/lora/mp_pkt_fwd.usb /opt/lora/mp_pkt_fwd
    else
	rm -rf /opt/lora/mp_pkt_fwd > /dev/null 2>&1
	ln -s /opt/lora/mp_pkt_fwd.spi /opt/lora/mp_pkt_fwd
    fi

    echo -n "Starting $NAME: "
    # start packet forwarder
    touch /var/run/run-lora
    start-stop-daemon --start --background --make-pidfile \
        --pidfile $pkt_fwd_pidfile_1 --exec $pkt_fwd 1
    start-stop-daemon --start --background --make-pidfile \
        --pidfile $pkt_fwd_pidfile_2 --exec $pkt_fwd 2
    echo "OK"
}

do_stop() {
    echo -n "Stopping $NAME: "
    rm /var/run/run-lora
    start-stop-daemon --stop -s 1 --quiet --oknodo --pidfile $pkt_fwd_pidfile_1 --retry 5
    start-stop-daemon --stop -s 1 --quiet --oknodo --pidfile $pkt_fwd_pidfile_2 --retry 5
    killall lora_pkt_fwd 
    rm -f $pkt_fwd_pidfile_1
    rm -f $pkt_fwd_pidfile_2
    echo "OK"
}

if [ "$ENABLED" != "yes" ]; then
    echo "$NAME: disabled in /etc/default"
    exit
fi

case "$1" in
    "start")
        do_start
        ;;
    "stop")
        do_stop
        ;;
    "restart")
        ## Stop the service and regardless of whether it was
        ## running or not, start it again.
        do_stop
        do_start
        ;;
    *)
        ## If no parameters are given, print which are avaiable.
        echo "Usage: $0 {start|stop|restart}"
        exit 1
        ;;
esac

