#! /bin/bash

# Exit if we're debugging and haven't yet built the gateway.

if [ ! -f  "ttn-gateway" ]; then
	echo "ERROR: gateway executable not yet built"
	exit 1
fi

if [[ $GW_DEBUG != "" ]]; then
    echo "*** GW_DEBUG asserted - exiting ***"
    exit 1
fi

# We need to be online, wait if needed.

until $(curl --output /dev/null --silent --head --fail http://www.google.com); do
  echo "[TTN Gateway]: Waiting for internet connection..."
  sleep 30
  done

# Ensure that we've got the required env vars

echo "*******************"
echo "*** Configuration:"
echo "*******************"

if [[ $GW_REGION == "" ]]; then
    echo "ERROR: GW_REGION required"
	exit 1
fi
echo GW_REGION: $GW_REGION

if [[ $GW_DESCRIPTION == "" ]]; then
    echo "ERROR: GW_DESCRIPTION required"
	echo "See https://github.com/rayozzie/ttn-resin-gateway-rpi/blob/master/README.md"
	exit 1
fi

if [[ $GW_CONTACT_EMAIL == "" ]]; then
    echo "ERROR: GW_CONTACT_EMAIL required"
	echo "See https://github.com/rayozzie/ttn-resin-gateway-rpi/blob/master/README.md"
	exit 1
fi

if [[ $GW_TYPE == "" ]]; then
	echo "ERROR: GW_TYPE required"
	echo "See https://github.com/rayozzie/ttn-resin-gateway-rpi/blob/master/README.md"
	exit 1
fi

echo "******************"
echo ""

# Load the region-appropriate global config

if curl -sS --fail https://raw.githubusercontent.com/TheThingsNetwork/gateway-conf/master/$GW_REGION-global_conf.json --output ./global_conf.json
then
	echo Successfully loaded $GW_REGION-global_conf.json from TTN repo
else
	echo "******************"
    echo "ERROR: GW_REGION not found"
	echo "******************"
    exit 1
fi

# Fetch location info, which we'll use as a hint to the gateway software

if curl -sS --fail ipinfo.io --output ./ipinfo.json
then
	echo "Actual gateway location:"
	IPINFO=$(cat ./ipinfo.json)
	echo $IPINFO
else
	echo "Unable to determine gateway location"
	IPINFO="\"\""
fi

# Set up environmental defaults for local.conf

if [[ $GW_REF_LATITUDE == "" ]]; then GW_REF_LATITUDE="52.376364"; fi
if [[ $GW_REF_LONGITUDE == "" ]]; then GW_REF_LONGITUDE="4.884232"; fi
if [[ $GW_REF_ALTITUDE == "" ]]; then GW_REF_ALTITUDE="3"; fi

if [[ $GW_GPS == "" ]]; then GW_GPS="true"; fi
if [[ $GW_BEACON == "" ]]; then GW_BEACON="false"; fi
if [[ $GW_MONITOR == "" ]]; then GW_MONITOR="false"; fi
if [[ $GW_UPSTREAM == "" ]]; then GW_UPSTREAM="true"; fi
if [[ $GW_DOWNSTREAM == "" ]]; then GW_DOWNSTREAM="true"; fi
if [[ $GW_GHOSTSTREAM == "" ]]; then GW_GHOSTSTREAM="false"; fi
if [[ $GW_RADIOSTREAM == "" ]]; then GW_RADIOSTREAM="true"; fi
if [[ $GW_STATUSSTREAM == "" ]]; then GW_STATUSSTREAM="true"; fi

if [[ $GW_KEEPALIVE_INTERVAL == "" ]]; then GW_KEEPALIVE_INTERVAL="10"; fi
if [[ $GW_STAT_INTERVAL == "" ]]; then GW_STAT_INTERVAL="30"; fi
if [[ $GW_PUSH_TIMEOUT_MS == "" ]]; then GW_PUSH_TIMEOUT_MS="100"; fi

if [[ $GW_FORWARD_CRC_VALID == "" ]]; then GW_FORWARD_CRC_VALID="true"; fi
if [[ $GW_FORWARD_CRC_ERROR == "" ]]; then GW_FORWARD_CRC_ERROR="false"; fi
if [[ $GW_FORWARD_CRC_DISABLED == "" ]]; then GW_FORWARD_CRC_DISABLED="false"; fi

if [[ $GW_GPS_TTY_PATH == "" ]]; then GW_GPS_TTY_PATH="\"/dev/ttyAMA0\""; fi
if [[ $GW_FAKE_GPS == "" ]]; then GW_FAKE_GPS="false"; fi

if [[ $GW_GHOST_ADDRESS == "" ]]; then GW_GHOST_ADDRESS="\"127.0.0.1\""; fi
if [[ $GW_GHOST_PORT == "" ]]; then GW_GHOST_PORT="1918"; fi

if [[ $GW_MONITOR_ADDRESS == "" ]]; then GW_MONITOR_ADDRESS="\"127.0.0.1\""; fi
if [[ $GW_MONITOR_PORT == "" ]]; then GW_MONITOR_PORT="2008"; fi

if [[ $GW_SSH_PATH == "" ]]; then GW_SSH_PATH="\"/usr/bin/ssh\""; fi
if [[ $GW_SSH_PORT == "" ]]; then GW_SSH_PORT="22"; fi

if [[ $GW_HTTP_PORT == "" ]]; then GW_HTTP_PORT="80"; fi

if [[ $GW_NGROK_PATH == "" ]]; then GW_NGROK_PATH="\"/usr/bin/ngrok\""; fi

if [[ $GW_SYSTEM_CALLS == "" ]]; then GW_SYSTEM_CALLS="[\"df -m\",\"free -h\",\"uptime\",\"who -a\",\"uname -a\"]"; fi

if [[ $GW_PLATFORM == "" ]]; then GW_PLATFORM="\"*\""; fi

# Synthesize local.conf JSON from env vars

echo -e "{\n\
\t\"gateway_conf\": {\n\
\t\t\"ref_latitude\": $GW_REF_LATITUDE,\n\
\t\t\"ref_longitude\": $GW_REF_LONGITUDE,\n\
\t\t\"ref_altitude\": $GW_REF_ALTITUDE,\n\
\t\t\"contact_email\": \"$GW_CONTACT_EMAIL\",\n\
\t\t\"description\": \"$GW_DESCRIPTION\", \n\
\t\t\"gps\": $GW_GPS,\n\
\t\t\"beacon\": $GW_BEACON,\n\
\t\t\"monitor\": $GW_MONITOR,\n\
\t\t\"upstream\": $GW_UPSTREAM,\n\
\t\t\"downstream\": $GW_DOWNSTREAM,\n\
\t\t\"ghoststream\": $GW_GHOSTSTREAM,\n\
\t\t\"radiostream\": $GW_RADIOSTREAM,\n\
\t\t\"statusstream\": $GW_STATUSSTREAM,\n\
\t\t\"keepalive_interval\": $GW_KEEPALIVE_INTERVAL,\n\
\t\t\"stat_interval\": $GW_STAT_INTERVAL,\n\
\t\t\"push_timeout_ms\": $GW_PUSH_TIMEOUT_MS,\n\
\t\t\"forward_crc_valid\": $GW_FORWARD_CRC_VALID,\n\
\t\t\"forward_crc_error\": $GW_FORWARD_CRC_ERROR,\n\
\t\t\"forward_crc_disabled\": $GW_FORWARD_CRC_DISABLED,\n\
\t\t\"gps_tty_path\": $GW_GPS_TTY_PATH,\n\
\t\t\"fake_gps\": $GW_FAKE_GPS,\n\
\t\t\"ghost_address\": $GW_GHOST_ADDRESS,\n\
\t\t\"ghost_port\": $GW_GHOST_PORT,\n\
\t\t\"monitor_address\": $GW_MONITOR_ADDRESS,\n\
\t\t\"monitor_port\": $GW_MONITOR_PORT,\n\
\t\t\"ssh_path\": $GW_SSH_PATH,\n\
\t\t\"ssh_port\": $GW_SSH_PORT,\n\
\t\t\"http_port\": $GW_HTTP_PORT,\n\
\t\t\"ngrok_path\": $GW_NGROK_PATH,\n\
\t\t\"system_calls\": $GW_SYSTEM_CALLS,\n\
\t\t\"platform\": $GW_PLATFORM,\n\
\t\t\"ipinfo\": $IPINFO,\n\
\t\t\"gateway_ID\": \"0000000000000000\"\n\
\t}\n\
}" >./local_conf.json

# Set gateway_ID in local_conf.json to the gateway's MAC address

echo "******************"
./set-gateway-id.sh start ./local_conf.json
echo "******************"
echo ""

# Reset the board to a known state prior to launching the forwarder

if [[ $GW_TYPE == "imst-ic880a-spi" ]]; then
	echo "Resetting IMST iC880A-SPI"
	gpio -1 mode 22 out
	gpio -1 write 22 0
	sleep 0.1
	gpio -1 write 22 1
	sleep 0.1
	gpio -1 write 22 0
	sleep 0.1
elif [[ $GW_TYPE == "linklabs-dev" ]]; then
	echo "Resetting LinkLabs Raspberry Pi Development Board"
	gpio -1 mode 29 out
	gpio -1 write 29 0
	sleep 0.1
	gpio -1 write 29 1
	sleep 0.1
	gpio -1 write 29 0
sleep 0.1
else
	echo "ERROR: unrecognized GW_TYPE=$GW_TYPE"
	echo "See https://github.com/rayozzie/ttn-resin-gateway-rpi/blob/master/README.md"
	exit 1
fi

# Fire up the forwarder.  

while true
  do
    echo "[TTN Gateway]: Starting packet forwarder..."
    ./ttn-gateway
	echo "******************"
    echo "*** [TTN Gateway]: EXIT (retrying in 15s)"
	echo "******************"
    sleep 15
  done