#!/bin/bash
# SPDX-License-Identifier: GPL-3.0+
# Copyright (C) 2018, Martin Kepplinger <martink@posteo.de>
RED='\033[0;31m'
GREEN='\033[0;32m'
NC='\033[0m'

set -e
have_input_image=0

usage()
{
	echo "Usage: $0 -i <4mb_top_image>.rom"
}

args=$(getopt -o i:h -- "$@")
if [ $? -ne 0 ] ; then
	usage
	exit 1
fi

eval set -- "$args"
while [ $# -gt 0 ]
do
	case "$1" in
	-i)
		INPUT_IMAGE_PATH=$2
		have_input_image=1
		shift
		;;
	-h)
		usage
		exit 1
		;;
	--)
		shift
		break
		;;
	*)
		echo "Invalid option: $1"
		exit 1
		;;
	esac
	shift
done


if [ ! "$have_input_image" -gt 0 ] ; then
	echo "no input image provided"
	usage
	exit 1
fi

OUTPUT_PATH=output
INPUT_IMAGE_NAME=$(basename ${INPUT_IMAGE_PATH})
OUTPUT_IMAGE_NAME=${INPUT_IMAGE_NAME%%.*}_prepared_12mb.rom
OUTPUT_IMAGE_PATH=${OUTPUT_PATH}/${OUTPUT_IMAGE_NAME}

echo -e "creating ${GREEN}${OUTPUT_IMAGE_PATH}${NC} from ${INPUT_IMAGE_NAME}"


input_filesize=$(wc -c <"$INPUT_IMAGE_PATH")
reference_filesize=4194304
if [ ! "$input_filesize" -eq "$reference_filesize" ] ; then
	echo "Error: input file must be 4MB of size"
	exit 1
fi

rm -rf output
mkdir output

dd if=/dev/zero of=${OUTPUT_IMAGE_PATH} bs=4M count=2
dd if=${INPUT_IMAGE_PATH} oflag=append conv=notrunc of=${OUTPUT_IMAGE_PATH} bs=4M

echo "0x00000000:0x007fffff ifdmegbe" > ${OUTPUT_PATH}/x230-layout.txt
echo "0x00800000:0x00bfffff bios" >> ${OUTPUT_PATH}/x230-layout.txt

echo "---------------------------------------------------------"
echo -e "${RED}CAUTION: internal flashing is NOT encouraged${NC}"
echo ""
echo "prepared files for internal flashing in output directory."
echo "template flashrom command (please adapt the chip name) :"
echo ""
echo -e "${GREEN}cd output${NC}"
echo -e "${GREEN}flashrom -p internal --layout x230-layout.txt --image bios -w ${OUTPUT_IMAGE_NAME}${NC}"
while true; do
	read -p "Do you wish to run this now? y/N: " yn
	case $yn in
		[Yy]* ) cd output && flashrom -p internal --layout x230-layout.txt --image bios -w ${OUTPUT_IMAGE_NAME}; break;;
		[Nn]* ) exit;;
		* ) exit;;
	esac
done