# Copyright 2023 Gentoo Authors
# Distributed under the terms of the GNU General Public License v2

EAPI=8

inherit mount-boot

DESCRIPTION="Make GRUB EFI boot image"
HOMEPAGE="https://wiki.gentoo.org/wiki/No_homepage"

S="${WORKDIR}"

LICENSE="GPL-3"
SLOT="0"
KEYWORDS="-* ~amd64 ~x86"

IUSE="+grub_platforms_efi-64 grub_platforms_efi-32 fontsize-24 fontsize-32"

DEPEND="
	sys-boot/grub:2=[fonts]
"
RDEPEND="${DEPEND}"
BDEPEND="
	sys-apps/util-linux
	media-fonts/dejavu
"

EFI_VENDOR="gentoo"
GRUB_FONT_SIZE="16"

src_prepare() {
	# grub-probe --target=fs_uuid doesn't work here
	BOOT_DEV="$(grub-probe --target=device /boot)"
	BOOT_PART_UUID="$(lsblk -o UUID -n ${BOOT_DEV})"
	GRUB_VERSION="$(best_version sys-boot/grub:2)"

	[[ -z $BOOT_PART_UUID ]] && die "Can't find /boot partition UUID"
	sed -e 's#@GENTOO_GRUB_VERSION@#'${GRUB_VERSION/*\/grub-/}'#g' \
		"${FILESDIR}"/sbat.csv.in > sbat.csv || die

	mkdir -p "${WORKDIR}/memdisk/fonts" || die
	sed -e 's#@BOOT_PART_UUID@#'${BOOT_PART_UUID}'#g' \
		"${FILESDIR}/grub-memdisk.cfg.in" > memdisk/grub.cfg || die

	cp "${FILESDIR}"/grub-bootstrap.cfg "${WORKDIR}"/

	eapply_user
}

src_compile() {
	local plateform
	local efi_name

	if use grub_platforms_efi-64; then
		platform="x86_64-efi"
		efi_name="x64"
	elif use grub_platforms_efi-32; then
		platform="i386-efi"
		efi_name="x32"
	else
		die "Unsupported platform"
	fi

	if use fontsize-24; then
		GRUB_FONT_SIZE="24"
	elif use fontsize-32; then
		GRUB_FONT_SIZE="32"
	fi

	grub-mkfont \
		-s "${GRUB_FONT_SIZE}" \
		-o "${WORKDIR}"/memdisk/fonts/unicode.pf2 \
		/usr/share/fonts/dejavu/DejaVuSansMono.ttf

	tar -cf "${WORKDIR}"/memdisk.tar -C "${WORKDIR}"/memdisk .

	grub-mkimage \
		-O "${platform}" \
		-o "${WORKDIR}"/grub${efi_name}.efi \
		-c "${WORKDIR}"/grub-bootstrap.cfg \
		-d "/usr/lib/grub/${platform}" \
		-m "${WORKDIR}"/memdisk.tar \
		-p "/EFI/gentoo" \
		--sbat "${WORKDIR}"/sbat.csv \
		$(cat "${FILESDIR}"/grub-efi-modules)
}

src_install() {
	insinto /usr/lib/"${PN}"
	doins grub*.efi
}