# Libreboot project firmware distribution
#
# Copyright (C) 2015  Patrick "P. J." McDermott
#
# This program is free software: you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation, either version 3 of the License, or
# (at your option) any later version.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with this program.  If not, see <http://www.gnu.org/licenses/>.

dist_libreboot_get_name()
{
	printf 'Libreboot project'
	return 0
}

dist_libreboot_get_mirrors()
{
	cat <<-EOF
		http://mirrors.mit.edu/libreboot/
			MIT, USA
		http://www.mirrorservice.org/sites/libreboot.org/release/
			University of Kent, UK
		http://elgrande74.net/libreboot/
			elgrande74.net, France
		http://mirror.linux.ro/libreboot/
			linux.ro, Romania
		http://ginette.swordarmor.fr/libreboot/
			swordarmor.fr, France
		http://libreboot.nedson.net/
			nedson.net, Canada
		http://mirror.helium.in-berlin.de/libreboot/
			in-berlin.de, Germany
		http://mirror.se.partyvan.eu/pub/libreboot/
			partyvan.eu, Sweden
		EOF
	return 0
}

dist_libreboot_get_versions()
{
	local mirror="${1}"
	local board="${2}"
	shift 2
	local version=
	local versions=''

	while read -r version; do
		case "${version}" in
			201[34]* | 20150[1-4]*)
				# These versions had ROMs in X60_binary.tar.gz,
				# libreboot_bin.tar.gz, or libreboot_bin.tar.xz
				# files.  These are unsupported for now.
				continue
				;;
			'20150518')
				sums='sha512sum.txt'
				archive="./rom/libreboot_${board}.tar.xz"
				;;
			*)
				sums='SHA512SUMS'
				archive="./rom/grub/libreboot_${version}"
				archive="${archive}_grub_${board}.tar.xz"
				;;
		esac
		if dl "${mirror}/${version}/${sums}" | \
				grep -F "  ${archive}" >/dev/null 2>&1; then
			versions="${versions} ${version}"
		fi
	done <<-EOF
		20150518 $(: Hardcode this list until a manifest is available)
		EOF

	printf '%s ' ${versions}
	return 0
}

dist_libreboot_get_rom_20150518()
{
	local mirror="${1}"
	local version="${2}"
	local board="${3}"
	shift 3
	local archive=
	local sum=
	local arc_sum=
	local dir=
	local rom=''
	local keymaps=''
	local i=0

	# Download checksums and ROMs archive.
	archive="libreboot_${board}.tar.xz"
	if ! sum="$(dl_temp "${mirror}/${version}/sha512sum.txt" 'sums')"; then
		err 'Failed to download checksums'
		rm_temp 'sums'
	fi
	sum="$(grep -F "  ./rom/${archive}" "${sum}" | cut -d ' ' -f 1)"
	if ! archive="$(dl_temp "${mirror}/${version}/rom/${archive}" \
			'roms')"; then
		err 'Failed to download ROMs archive'
		rm_temp 'sums'
		rm_temp 'roms'
	fi

	# Verify checksum.
	arc_sum="$(${SHA512SUM} "${archive}" | cut -d ' ' -f 1)"
	if [ "x${arc_sum}" != "x${sum}" ]; then
		err 'ROM archive checksum mismatch'
		rm_temp 'sums'
		rm_temp 'roms'
		return 1
	fi

	# Select keymap.
	dir="${board}"
	while read -r rom; do
		case "${rom}" in
			${dir}/${board}_*_vesafb.rom)
				rom="${rom#${dir}/${board}_}"
				rom="${rom%_vesafb.rom}"
				keymaps="${keymaps} ${rom}"
				;;
		esac
	done <<-EOF
		$(unxz -c "${archive}" | tar -t)
		EOF
	i=$(show_menu 'Select keymap' $(printf '%s\n' ${keymaps} | sort))
	i=$(($i + 1))
	rom="$(printf '%s ' ${keymaps} | cut -d ' ' -f ${i})"
	rom="${dir}/${board}_${rom}_vesafb.rom"
	info 'Using ROM "%s"' "${rom}"

	# Extract ROM.
	if ! unxz -c "${archive}" | tar -xO "${rom}" >"$(get_temp_dir)/rom"
	then
		err 'Failed to extract ROM'
		rm_temp 'sums'
		rm_temp 'roms'
		rm_temp 'rom'
	fi

	rm_temp 'sums'
	rm_temp 'roms'

	return 0
}

dist_libreboot_get_rom_current()
{
	local mirror="${1}"
	local version="${2}"
	local board="${3}"
	shift 3
	local archive=
	local sum=
	local arc_sum=
	local dir=
	local rom=''
	local keymaps=''
	local i=0

	# Download checksums and ROMs archive.
	archive="libreboot_${version}_grub_${board}.tar.xz"
	if ! sum="$(dl_temp "${mirror}/${version}/SHA512SUMS" 'sums')"; then
		err 'Failed to download checksums'
		rm_temp 'sums'
	fi
	sum="$(grep -F "  ./rom/grub/${archive}" "${sum}" | cut -d ' ' -f 1)"
	if ! archive="$(dl_temp "${mirror}/${version}/rom/grub/${archive}" \
			'roms')"; then
		err 'Failed to download ROMs archive'
		rm_temp 'sums'
		rm_temp 'roms'
	fi

	# Verify checksum.
	arc_sum="$(${SHA512SUM} "${archive}" | cut -d ' ' -f 1)"
	if [ "x${arc_sum}" != "x${sum}" ]; then
		err 'ROM archive checksum mismatch'
		rm_temp 'sums'
		rm_temp 'roms'
		return 1
	fi

	# Select keymap.
	dir="libreboot_${version}_grub_${board}"
	while read -r rom; do
		case "${rom}" in
			${dir}/${board}_*_vesafb.rom)
				rom="${rom#${dir}/${board}_}"
				rom="${rom%_vesafb.rom}"
				keymaps="${keymaps} ${rom}"
				;;
		esac
	done <<-EOF
		$(unxz -c "${archive}" | tar -t)
		EOF
	i=$(show_menu 'Select keymap' $(printf '%s\n' ${keymaps} | sort))
	i=$(($i + 1))
	rom="$(printf '%s ' ${keymaps} | cut -d ' ' -f ${i})"
	rom="${dir}/${board}_${rom}_vesafb.rom"
	info 'Using ROM "%s"' "${rom}"

	# Extract ROM.
	if ! unxz -c "${archive}" | tar -xO "${rom}" >"$(get_temp_dir)/rom"
	then
		err 'Failed to extract ROM'
		rm_temp 'sums'
		rm_temp 'roms'
		rm_temp 'rom'
	fi

	rm_temp 'sums'
	rm_temp 'roms'

	return 0
}

dist_libreboot_get_rom()
{
	local mirror="${1}"
	local version="${2}"
	local board="${3}"
	shift 3

	case "${version}" in
		'20150518')
			if dist_libreboot_get_rom_20150518 "${mirror}" \
					"${version}" "${board}"; then
				return 0
			else
				return 1
			fi
			;;
		*)
			if dist_libreboot_get_rom_current "${mirror}" \
					"${version}" "${board}"; then
				return 0
			else
				return 1
			fi
			;;
	esac
}