#! /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 [[ $HALT != "" ]]; then
    echo "*** HALT asserted - exiting ***"
    exit 1
fi

# Show info about the machine we're running on

echo "*** Resin Machine Info:"
echo "*** Type: '$RESIN_MACHINE_NAME'"
echo "*** Arch: '$RESIN_ARCH'"
echo "*** Cfg1: '$RESIN_HOST_CONFIG_dtoverlay'"
echo "*** Cfg2: '$RESIN_HOST_CONFIG_core_freq'"

##### Raspberry Pi 3 hacks necessary for LinkLabs boards
##
## Because of backward incompatibility between RPi2 and RPi3,
## a hack is necessary to get serial working so that we can
## access the GPS on the LinkLabs board.
## 
## Option #1: Leave RPi serial on /dev/ttyS0 and bluetooth on /dev/ttyAMA0
##  This requires adding this Fleet Configuration variable, which
##  fixes RPi3 serial port speed issues:
##    RESIN_HOST_CONFIG_core_freq = 250
##
## Option #2: Disable bluetooth and put RPi serial back onto /dev/ttyAMA0
##  This requires adding this Fleet Configuration variable, which
##  swaps the bluetooth and serial uarts:
##    RESIN_HOST_CONFIG_dtoverlay=pi3-miniuart-bt
##
#####

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

if [[ $GW_TYPE == "linklabs-dev" && "$RESIN_MACHINE_NAME" == "raspberrypi3" ]]
then
	echo "*** Raspberry Pi 3 with LinkLabs board"
	if [[ "$RESIN_HOST_CONFIG_dtoverlay" == "pi3-miniuart-bt" ]]
	then
		echo "*** Operating with Bluetooth disabled, and UART swapped onto /dev/ttyAMA0"
		if [[ "$RESIN_HOST_CONFIG_core_freq" != "" ]]
		then
			echo "ERROR: Fleet configuration can only have EITHER dtoverlay OR core_freq, but not both."
			exit 1
		fi
	elif [[ "$RESIN_HOST_CONFIG_core_freq" == "250" ]]
	then
   		echo "*** Operating with Bluetooth enabled, and UART frequency adjusted to work properly"
    else
		echo "*** Please add one of these two Resin Fleet Configuration variables (but not both)"
        echo "*** If there is some reason you need Bluetooth (which is unlikely):"
        echo "***     RESIN_HOST_CONFIG_dtoverlay=pi3-miniuart-bt"
        echo "*** Otherwise:"
        echo "***     RESIN_HOST_CONFIG_core_freq=250"
## regression? Resin OS 1.24.0 now no longer seems to expose fleet configuration vars
##        exit 1
	fi

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

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 [[ $GW_GPS_TTY_PATH == "" ]]
then 
	# Default to AMA0 unless this is an RPi3 with core frequency set in fleet config vars
	GW_GPS_TTY_PATH="/dev/ttyAMA0"
	if [[ "$RESIN_MACHINE_NAME" == "raspberrypi3" && "$RESIN_HOST_CONFIG_core_freq" != "" ]]
	then
		GW_GPS_TTY_PATH="/dev/ttyS0"
	fi
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