# Copyright 2022 Gentoo Authors
# Distributed under the terms of the GNU General Public License v2

EAPI=8

MODULES_OPTIONAL_USE="modules"
MODULES_OPTIONAL_USE_IUSE_DEFAULT="1"
inherit linux-mod

ORAZER_P="openrazer-${PV}"
DESCRIPTION="A collection of kernel drivers for Razer devices."
HOMEPAGE="https://github.com/openrazer/openrazer"
SRC_URI="https://github.com/openrazer/openrazer/archive/refs/tags/v${PV}.tar.gz -> ${ORAZER_P}.tar.gz"

LICENSE="GPL-2"
SLOT="0"
KEYWORDS="~amd64"

IUSE="dkms"
REQUIRED_USE="|| ( modules dkms )"

S="${WORKDIR%/}/${ORAZER_P}/driver"
MODULE_NAMES="
	razerkbd(kernel/drivers/hid)
	razermouse(kernel/drivers/hid)
	razerkraken(kernel/drivers/hid)
	razeraccessory(kernel/drivers/hid)
"
BUILD_TARGETS="clean modules"

src_compile() {
	BUILD_PARAMS="-C ${KV_DIR} M=${S}"
	linux-mod_src_compile
}

src_install() {
	linux-mod_src_install
	if use dkms; then
		pushd ..
		export DESTDIR=${ED}
		emake setup_dkms
		popd
	fi
}

pkg_postinst() {
	linux-mod_pkg_postinst
	if use modules; then
		if [[ $(uname -r) != "${KV_FULL}" ]]; then
			ewarn "You have just built ${PN} for kernel ${KV_FULL}, yet the currently"
			ewarn "running kernel is $(uname -r). If you intend to use these openrazer modules"
			ewarn "on the currently running machine, you will first need to reboot it into the"
			ewarn "kernel ${KV_FULL}, for which these modules was built."
		else
			local i old
			local -a my_modules=( $(while read l; do echo ${l%(*}; done <<< "${MODULE_NAMES}") )
			for (( i = 0; i < ${#my_modules[@]}; ++i )); do
				if [[ -f /sys/module/${my_modules[i]}/version ]]; then
					old="$(< /sys/module/${my_modules[i]}/version)"
					break
				fi
			done
			if [[ ${old} != '' && ${old} != ${PV} ]]; then
				ewarn
				ewarn "You appear to have just upgraded ${PN} from version v$old to v$PV."
				ewarn "However, the old version is still running on your system. In order to use the"
				ewarn "new version, you will need to remove the old modules and load the new ones. As"
				ewarn "root, you can accomplish this with the following commands:"
				ewarn
				ewarn "	# modprobe -r ${my_modules[@]}"
				ewarn " and then pull out and replug corresponding devices. Or, just restart your computer."
				ewarn
			fi
		fi
		elog
		elog "Everytime when you upgrade/downgrade the kernel, these modules should be rebuilt via:"
		elog " # emerge @module-rebuild"
		elog "to satifice the current used kernel."
		if use dkms; then
			elog " OR"
			elog "Use DKMS tools like sys-kernel/dkms::guru to manage these modules dynamically."
		fi
		elog
	elif use dkms; then
		local inststate="(NOT INSTALLED)"
		has_version sys-kernel/dkms && inststate="(INSTALLED)"
		ewarn
		ewarn "You should build these modules by yourself via DKMS tools like sys-kernel/dkms ${inststate}."
		ewarn " e.g.: # dkms add ${PN}/${PV}"
		ewarn "       # dkms install ${PN}/${PV}"
		ewarn
	fi
}