#!/bin/sh

PYTHON=${PYTHON:-$(which python3 python | head -n 1)}

set -e

# Usage info
show_help() {
	cat <<EOF
Usage: $(basename $0) [-h] [-p ESPTOOL_PORT] [-P PYTHON] [-f FILENAME|FILENAME]
Flash image file to device, but first erasing and writing system information"

    -h               Display this help and exit
    -p ESPTOOL_PORT  Set the environment variable for ESPTOOL_PORT.  If not set, ESPTOOL iterates all ports (Dangerous).
    -P PYTHON        Specify alternate python interpreter to use to invoke esptool. (Default: "$PYTHON")
    -f FILENAME      The .bin file to flash.  Custom to your device type and region.

EOF
}

while getopts ":hp:P:f:" opt; do
	case "${opt}" in
	h)
		show_help
		exit 0
		;;
	p)
		export ESPTOOL_PORT=${OPTARG}
		;;
	P)
		PYTHON=${OPTARG}
		;;
	f)
		FILENAME=${OPTARG}
		;;
	*)
		echo "Invalid flag."
		show_help >&2
		exit 1
		;;
	esac
done
shift "$((OPTIND - 1))"

[ -z "$FILENAME" -a -n "$1" ] && {
	FILENAME=$1
	shift
}

if [ -f "${FILENAME}" ] && [ ! -z "${FILENAME##*"update"*}" ]; then
	echo "Trying to flash ${FILENAME}, but first erasing and writing system information"
	"$PYTHON" -m esptool erase_flash
	"$PYTHON" -m esptool write_flash 0x00 ${FILENAME}
	"$PYTHON" -m esptool write_flash 0x260000 bleota.bin
	"$PYTHON" -m esptool write_flash 0x300000 littlefs-*.bin

else
	show_help
	echo "Invalid file: ${FILENAME}"
fi

exit 0