#!/usr/bin/env bash

# SPDX-FileCopyrightText: 2022 Caleb La Grange <thonkpeasant@protonmail.com>
# SPDX-License-Identifier: GPL-3.0-only

board="${1}"
# A shorthand for each board so as not to duplicate blobs for boards of different sizes
board_short=${board%%_*mb}

# Allow adding only blobs that can be legally redistributed (ifd+gbe)
if [ "${2}" = "redistributable" ]; then
	redistributable=true
else
	redistributable=false
fi

Download_needed(){
	for need in ${needs}; do
		case ${need} in
			*ME*)
				Extract_me || _failed+=" me"
				;;
			*MRC*)
				./download mrc || _failed+=" mrc"
				;;
	esac
	done
	
	if [ ! -z ${_failed+x} ]; then
	printf "\nERROR: failed to obtain${_failed}\nrun: './blobutil extract ${board} /path/to/romdump.rom' to extract the remaining blobs\n"
	exit 1
	fi
}

Extract_me(){
	_me_destination=${CONFIG_ME_BIN_PATH#../../}

	if [ -f "${_me_destination}" ]; then
		printf 'me already downloaded\n'
		return 0
	fi

	if [ -z "${me_dl+x}" ]; then
		printf 'no me download available for this board\n'
		return 1
	fi

	if [ ! -d "${_me_destination%/*}" ]; then
		mkdir -p ${_me_destination%/*}
	fi

	printf "Extracting neutered me for ${board}\n"
	
	# Delete old me downloads in case user is building for multiple boards
	if [ -f "blobs/me.exe" ]; then
		rm blobs/me.exe
	fi

	if [ -d "blobs/app" ]; then
		rm -r blobs/app
	fi

	curl ${me_dl} > blobs/me.exe || curl ${me_dl_bkup} > blobs/me.exe

	if [ ! "$(sha1sum blobs/me.exe)" = "${me_hash}  blobs/me.exe" ]; then
		printf 'checksum of downloaded me did not mactch\ncorrupted me downloaded or wrong me for board\n'
		rm blobs/me.exe
		return 1
	fi

	( cd blobs && innoextract me.exe )
	printf 'extracting and stripping intel management engine\n'
	./me_cleaner/me_cleaner.py -r -t -O ${_me_destination} blobs/app/*ME*.bin \
	|| ./resources/blobs/me7_update_parser.py -O ${_me_destination} blobs/app/ME7*.bin
	printf "Truncated and cleaned me output to ${_me_destination}\n"
}

Build_deps(){
	if [ ! -d me_cleaner ]; then
		printf "downloading me_cleaner\n"
		./download me_cleaner
	fi

	if [ ! -d coreboot/default ]; then
		printf "downloading coreboot\n"
		./download coreboot default
	fi
	
	if [ ! -f "coreboot/default/util/ifdtool/ifdtool" ]; then
	printf "building ifdtool from coreboot\n"
	( cd coreboot/default/util/ifdtool && make )
	fi
}

set -- "resources/coreboot/${board}/config/*"
. ${1} 2>/dev/null
. "resources/coreboot/${board}/board.cfg"

if [ "${CONFIG_HAVE_MRC}" = "y" ]; then
	if [ "${redistributable}" = "false" ]; then
		printf 'haswell board detected, downloading mrc\n'
		needs+=" MRC"
	fi

fi

if [ "${CONFIG_HAVE_IFD_BIN}" = "y" ]; then
	printf 'board needs intel firmware descriptor\n'
	needs+=" IFD"
fi

if [ "${CONFIG_HAVE_ME_BIN}" = "y" ]; then
	if [ "${redistributable}" = "false" ]; then
		printf 'board needs intel management engine\n'
		needs+=" ME"
	fi
fi

if [ "${CONFIG_HAVE_GBE_BIN}" = "y" ]; then
	printf 'board needs gigabit ethernet firmware\n'
	needs+=" GBE"
fi

# Quickly exit without wasting more time if there are no blobs needed (GM45)
if [ -z ${needs+x} ]; then
	printf 'No binary blobs needed for this board\n'
	exit 0
fi

Build_deps

while read -r line ; do
	case ${line} in
		ME_hash*)
		set ${line}
		me_hash=${2}
		;;
		ME_dl*)
		set ${line}
		me_dl=${2}
		;;
		ME_bkup_dl*)
		set ${line}
		me_dl_bkup=${2}
		;;
	esac
done <<< $(eval "awk ' /\{.*${board_short}.*}{/ {flag=1;next} /\}/{flag=0} flag { print }' resources/blobs/sources")

Download_needed