#!/usr/bin/env bash
# Convenience script for loading firmware onto a dfu type device
# By default, initiates dfu-util

SERIAL_PORT=""
AUTO_SCREEN_SESSION=""
PROG_NAME=$(basename $0)

# Parse all the command line arguments
while (( "$#" >= "1" )); do
	# Scan each argument
	key="$1"
	case $key in
	-a|--autoscreen)
		AUTO_SCREEN_SESSION="$2"
		shift
		;;
	-f|--fastload)
		SERIAL_PORT="$2"
		shift
		;;
	-h|--help)
		echo "Usage: $PROG_NAME [options...]"
		echo ""
		echo "Loads the most recent built firmware (@TARGET_BIN@) to the device."
		echo "  (load.dfu)"
		echo ""
		echo "Arguments:"
		echo " -a, --autoscreen SERIAL_PORT  Use screen on the specified serial port after loading."
		echo "                               e.g. /dev/ttyACM0"
		echo " -f, --fastload SERIAL_PORT    Send the reload command to the debug terminal."
		echo "                               e.g. /dev/ttyACM0"
		echo "                               NOTE: May not work due to non-functional terminal, or disable remote flashing"
		echo " -h, --help                    This message."
		exit 1
		;;
	*)
		echo "INVALID ARG: '$1'"
		exit 2
		;;
	esac

	# Shift to the next argument
	shift
done

# If a SERIAL_PORT was specified set the uC into reflash mode
# XXX May not be successful if uC is not in a good state (or does not allow remote flashing)
if [[ "$SERIAL_PORT" != "" ]] && [[ -e "$SERIAL_PORT" ]]; then
	echo "NOTE: This may fail if the uC is in a bad state or does not support remote flashing"
	printf "reload\r" > $SERIAL_PORT
	sleep 2
fi

# Load via dfu-util
# Used for McHCK based uCs
if type dfu-util &>/dev/null; then
	dfu-util -D @TARGET_BIN@
	EXIT_STATUS=$?
else
	echo "dfu-util is required to reprogram the device"
	exit 3
fi

# Load Screen Session if specified
if (( "$EXIT_STATUS" == "0" )) && [[ "$AUTO_SCREEN_SESSION" != "" ]]; then
	if type screen &>/dev/null; then
		sleep 0.1
		screen $AUTO_SCREEN_SESSION
	else
		echo "screen is not installed"
		exit 3
	fi
fi

exit $EXIT_STATUS