#!/bin/bash


NAME="lora-network-server"
LOCK="/var/lock/$NAME"
ENABLED="yes"


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


run_dir=/var/run/lora
conf_dir=/var/config/lora
conf_file=$conf_dir/lora-network-server.conf


net_server=/opt/lora/lora-network-server
net_server_log=/var/log/lora-network-server.log
net_server_pidfile=$run_dir/$NAME.pid


pkt_fwd=$run_dir/1/lora_pkt_fwd
pkt_fwd_log=/var/log/lora-pkt-fwd-1.log
pkt_fwd_pidfile=$run_dir/lora-pkt-fwd-1.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"

lora_mtcap_id="MTCAP-LORA"
lora_mtcap_id868="MTCAP-LORA-868"
lora_mtcap_id915="MTCAP-LORA-915"

read_lora_hw_info() {
    # product-id of first lora card
    lora_id=$(mts-io-sysfs show lora/product-id 2> /dev/null)
    lora_eui=$(mts-io-sysfs show lora/eui 2> /dev/null)
    # remove all colons
    lora_eui_raw=${lora_eui//:}
    lora_hw=$(mts-io-sysfs show lora/hw-version 2> /dev/null)
}


hardware_found() {
    # MTCDT only
    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

    if [[ "$lora_id" =~ "$lora_mtac_id" ]]; then
        GLOBAL_CONF=/opt/lora/global_conf.json.MTAC_LORA_1_0
        if [ "$lora_hw" = "$lora_1_0_hw" ] && [[ ! "$lora_id" =~ .*-SPI ]]; then
            ln -sf /opt/lora/basic_pkt_fwd-usb $pkt_fwd
        else
            if [ "$lora_hw" = "$lora_1_5_h_hw" ]; then
                GLOBAL_CONF=/opt/lora/global_conf.json.MTAC_LORA_1_5
            fi
            ln -sf /opt/lora/lora_pkt_fwd $pkt_fwd
        fi

        diff $GLOBAL_CONF /opt/lora/global_conf.json &> /dev/null
        if [ $? -ne 0 ]; then
            cp $GLOBAL_CONF /opt/lora/global_conf.json
        fi

        return 0
    elif [[ "$lora_id" =~ "$lora_mtcap_id" ]]; then
        if [ "$lora_id" = "$lora_mtcap_id868" ]; then
            GLOBAL_CONF=/opt/lora/global_conf.json.MTCAP_LORA_1_5.EU868
        elif [ "$lora_id" = "$lora_mtcap_id915" ]; then
            GLOBAL_CONF=/opt/lora/global_conf.json.MTCAP_LORA_1_5.US915
        else
            return 1
        fi

        ln -sf /opt/lora/lora_pkt_fwd $pkt_fwd

        diff $GLOBAL_CONF /opt/lora/global_conf.json &> /dev/null
        if [ $? -ne 0 ]; then
            cp $GLOBAL_CONF /opt/lora/global_conf.json
        fi

        return 0
    else
        echo Lora hardware not detected
        return 1
    fi
}


do_start() {
    # create run directory
    mkdir -p $run_dir/1
    rm -rf $run_dir/1/*

    read_lora_hw_info

    if ! [ -f $conf_file ]; then
        echo "$0: $conf_file missing"
        exit 1
    fi

    if hardware_found; then
        echo "Found $lora_id with $lora_hw hardware"
    else
        echo "$0: Lora hardware not detected"
        exit 1
    fi
    echo -n "Starting $NAME: "
    # start network server
     start-stop-daemon --start --background --make-pidfile \
        --pidfile $net_server_pidfile --startas /bin/bash -- -c "exec $net_server \
        -c $conf_file --lora-eui $lora_eui --lora-prod-1 $lora_id --lora-hw-1 $lora_hw \
        --lora-path $run_dir \
        --noconsole -l $net_server_log  >> $net_server_log 2>&1"
    sleep 2
    # start packet forwarder
    /usr/sbin/start-stop-daemon --chdir $run_dir/1 --background --start --make-pidfile \
        --pidfile $pkt_fwd_pidfile --startas /bin/bash -- -c "exec $pkt_fwd"

    renice -n -20 -p $(pgrep lora-network-se)
    renice -n -20 -p $(pgrep $(basename $pkt_fwd))


    echo "OK"
}


do_stop() {
    echo -n "Stopping $NAME: "
    start-stop-daemon --stop --quiet --oknodo --pidfile $net_server_pidfile --retry 15
    start-stop-daemon --stop --quiet --oknodo --pidfile $pkt_fwd_pidfile --retry 5
    rm -f $net_server_pidfile $pkt_fwd_pidfile
    echo "OK"
}


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

force_stop() {                                  
    do_stop                                     
    rm -fr $LOCK        
}                               
        
function try_lock() {                           
    if mkdir $LOCK; then
        trap "rm -fr $LOCK" EXIT
    else
        echo "Lora Network Server lock not acquired, resource in use"
        exit 1
    fi
}




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