# Maintainer: Markus Fritsche <fritsche.markus@gmail.com>
#
# daedalus-v4l2-dkms — DKMS package for the daedalus_v4l2 out-of-tree
# kernel module (V4L2 stateless decoder shim for Pi 5 / CM5).
#
# Pair to daedalus-v4l2 (userspace daemon).  When loaded, the module
# registers /dev/videoNN (V4L2 m2m) + /dev/mediaNN (media controller) +
# /dev/daedalus-v4l2 (chardev to the userspace daemon).  Userspace
# clients drive the V4L2 m2m + request API path; the daemon does the
# actual FFmpeg-backed decode on /dev/daedalus-v4l2.
#
# Project: https://git.reauktion.de/reauktion/daedalus-v4l2
# Sibling userspace package: daedalus-v4l2
# Sibling consumer: libva-v4l2-request-fourier

pkgname=daedalus-v4l2-dkms
_module=daedalus_v4l2

# Same pin as arch/daedalus-v4l2 — keep kernel module + daemon
# bit-versioned together so the chardev wire protocol stays in sync.
# 5d8b436 reverts PRs #7 + #8 (parking design that broke libva's
# 1:1 contract — see daedalus-v4l2#9 + #10).  Tree is
# content-equivalent to f0d4186 plus PR #4 (cosmetic menu ctrls).
# PROTO_VERSION drops 1 → 0; lock-step install with
# daedalus-v4l2 0.1.0.r33.5d8b436 REQUIRED.
_commit=872eec505eb91b561892d02a0526749348ddc121

pkgver=0.1.0.r45.872eec5
pkgrel=1  # reset for new upstream pin (872eec5 — PROTO_MAX_PAYLOAD 64 KiB -> 1 MiB, closes #19); lock-step with daedalus-v4l2 0.1.0.r45.872eec5 REQUIRED
pkgdesc="V4L2 stateless decoder shim kernel module (DKMS) — Pi 5 / CM5"
arch=('any')
url="https://git.reauktion.de/reauktion/daedalus-v4l2"
license=('GPL-2.0-or-later')
depends=('dkms')
makedepends=('git')
install="${pkgname}.install"

source=("git+https://git.reauktion.de/reauktion/daedalus-v4l2.git#commit=${_commit}"
        "dkms.conf"
        "${pkgname}.install")
sha256sums=('SKIP'
            'SKIP'
            'SKIP')

pkgver() {
    cd "${srcdir}/daedalus-v4l2"
    printf '0.1.0.r%s.%s' \
        "$(git rev-list --count HEAD)" \
        "$(git rev-parse --short=7 HEAD)"
}

package() {
    local _src="${pkgdir}/usr/src/${_module}-${pkgver}"

    install -dm755 "${_src}"

    # Install the kernel/ subdir and embed the shared proto header in
    # the same tree.  The in-tree Makefile uses
    # `ccflags-y += -I$(src)/../include` (assuming the parent
    # daedalus-v4l2 layout); for DKMS we flatten by copying the header
    # into kernel/include/ and patching the Makefile to point there.
    cp -r "${srcdir}/daedalus-v4l2/kernel/." "${_src}/"
    install -Dm644 "${srcdir}/daedalus-v4l2/include/daedalus_v4l2_proto.h" \
        "${_src}/include/daedalus_v4l2_proto.h"
    sed -i 's|-I\$(src)/\.\./include|-I$(src)/include|' "${_src}/Makefile"

    # dkms.conf at the root of the source tree (DKMS convention).
    # Substitute #MODULE_VERSION# placeholder with the actual pkgver
    # so dkms install/uninstall match what's on disk.
    install -Dm644 "${srcdir}/dkms.conf" "${_src}/dkms.conf"
    sed -i "s/#MODULE_VERSION#/${pkgver}/" "${_src}/dkms.conf"

    # License
    install -Dm644 "${srcdir}/daedalus-v4l2/kernel/daedalus_v4l2_main.c" \
        "${pkgdir}/usr/share/licenses/${pkgname}/SPDX-HEADER"
}