#!/bin/sh

# Helper script that reads /etc/default/dump1090-fa
# and either starts dump1090-fa with the configured
# arguments, or exits with status 64 to tell systemd
# not to auto-restart the service.

if [ -f /etc/default/dump1090-fa ]
then
    . /etc/default/dump1090-fa
fi

if [ -f /var/cache/piaware/location.env ]
then
    . /var/cache/piaware/location.env
fi

if [ "$ENABLED" != "yes" ]
then
    echo "dump1090-fa not enabled in /etc/default/dump1090-fa" >&2
    exit 64
fi

# process options

# if there's no CONFIG_STYLE, infer a version
if [ -z "$CONFIG_STYLE" ]
then
   if [ -n "$RECEIVER_OPTIONS" -o -n "$DECODER_OPTIONS" -o -n "$NET_OPTIONS" -o -n "$JSON_OPTIONS" ]
   then
       CONFIG_STYLE=5
   else
       CONFIG_STYLE=6
   fi
fi

is_slow_cpu() {
    case "$SLOW_CPU" in
        yes) return 0 ;;
        auto)
            case $(uname -m) in
                armv6*) return 0 ;;
                *) return 1 ;;
            esac
            ;;
        *) return 1 ;;
    esac
}

if [ "$CONFIG_STYLE" = "5" ]
then
    # old style config file
    echo "/etc/default/dump1090-fa is using the old config style, please consider updating it" >&2
    OPTS="$RECEIVER_OPTIONS $DECODER_OPTIONS $NET_OPTIONS $JSON_OPTIONS"
elif [ -n "$OVERRIDE_OPTIONS" ]
then
    # ignore all other settings, use only provided options
    OPTS="$OVERRIDE_OPTIONS"
else
    # build a list of options based on config settings    
    OPTS=""

    if [ "${RECEIVER:-none}" = "none" ]
    then
        OPTS="$OPTS --device-type none"
    else
        if [ -n "$RECEIVER" ]; then OPTS="$OPTS --device-type $RECEIVER"; fi
        if [ -n "$RECEIVER_SERIAL" ]; then OPTS="$OPTS --device-index $RECEIVER_SERIAL"; fi
        if [ -n "$RECEIVER_GAIN" ]; then OPTS="$OPTS --gain $RECEIVER_GAIN"; fi
        if [ -n "$WISDOM" -a -f "$WISDOM" ]; then OPTS="$OPTS --wisdom $WISDOM"; fi

        if [ "$ADAPTIVE_DYNAMIC_RANGE" = "yes" ]; then OPTS="$OPTS --adaptive-range"; fi
        if [ -n "$ADAPTIVE_DYNAMIC_RANGE_TARGET" ]; then OPTS="$OPTS --adaptive-range-target $ADAPTIVE_DYNAMIC_RANGE_TARGET"; fi
        if [ "$ADAPTIVE_BURST" = "yes" ]; then OPTS="$OPTS --adaptive-burst"; fi
        if [ -n "$ADAPTIVE_MIN_GAIN" ]; then OPTS="$OPTS --adaptive-min-gain $ADAPTIVE_MIN_GAIN"; fi
        if [ -n "$ADAPTIVE_MAX_GAIN" ]; then OPTS="$OPTS --adaptive-max-gain $ADAPTIVE_MAX_GAIN"; fi

        if is_slow_cpu
        then
            OPTS="$OPTS --adaptive-duty-cycle 10 --no-fix-df"
        fi
    fi

    if [ "$ERROR_CORRECTION" = "yes" ]; then OPTS="$OPTS --fix"; fi

    if [ -n "$RECEIVER_LAT" -a -n "$RECEIVER_LON" ]; then
        OPTS="$OPTS --lat $RECEIVER_LAT --lon $RECEIVER_LON"
    elif  [ -n "$PIAWARE_LAT" -a -n "$PIAWARE_LON" ]; then
        OPTS="$OPTS --lat $PIAWARE_LAT --lon $PIAWARE_LON"
    fi

    if [ -n "$MAX_RANGE" ]; then OPTS="$OPTS --max-range $MAX_RANGE"; fi

    if [ -n "$NET_RAW_INPUT_PORTS" ]; then OPTS="$OPTS --net-ri-port $NET_RAW_INPUT_PORTS"; fi
    if [ -n "$NET_RAW_OUTPUT_PORTS" ]; then OPTS="$OPTS --net-ro-port $NET_RAW_OUTPUT_PORTS"; fi
    if [ -n "$NET_SBS_OUTPUT_PORTS" ]; then OPTS="$OPTS --net-sbs-port $NET_SBS_OUTPUT_PORTS"; fi
    if [ -n "$NET_BEAST_INPUT_PORTS" ]; then OPTS="$OPTS --net-bi-port $NET_BEAST_INPUT_PORTS"; fi
    if [ -n "$NET_BEAST_OUTPUT_PORTS" ]; then OPTS="$OPTS --net-bo-port $NET_BEAST_OUTPUT_PORTS"; fi

    if [ -n "$JSON_LOCATION_ACCURACY" ]; then OPTS="$OPTS --json-location-accuracy $JSON_LOCATION_ACCURACY"; fi

    if [ -n "$EXTRA_OPTIONS" ]; then OPTS="$OPTS $EXTRA_OPTIONS"; fi
fi

exec /usr/bin/dump1090-fa --quiet $OPTS "$@"
# exec failed, do not restart
exit 64