# Copyright 1999-2026 Gentoo Authors
# Distributed under the terms of the GNU General Public License v2

EAPI=8

PYTHON_COMPAT=( python3_{12..14} )
TCL_SLOT="8.6"
inherit cmake desktop python-single-r1 xdg flag-o-matic

DESCRIPTION="Automatic 3d tetrahedral mesh generator"
HOMEPAGE="https://ngsolve.org/ https://github.com/NGSolve/netgen"

if [[ ${PV} == *9999* ]]; then
	inherit git-r3
	EGIT_REPO_URI="https://github.com/NGSolve/netgen.git"
else
	SRC_URI="
		https://github.com/NGSolve/netgen/archive/refs/tags/v${PV}.tar.gz -> ${P}.tar.gz
	"
	KEYWORDS="~amd64 ~x86"
fi

LICENSE="LGPL-2.1"
SLOT="0"

IUSE="ffmpeg gui jpeg mpi +opencascade python test"
RESTRICT="!test? ( test )"

REQUIRED_USE="
	python? ( ${PYTHON_REQUIRED_USE} )
	ffmpeg? ( gui )
	jpeg? ( gui )
	python? ( gui )
"

DEPEND="
	virtual/zlib:=
	ffmpeg? ( media-video/ffmpeg:= )
	gui? (
		dev-lang/tcl:0/${TCL_SLOT}
		dev-lang/tk:0/${TCL_SLOT}
		media-libs/glu
		media-libs/libglvnd[X]
		x11-libs/libX11
		x11-libs/libXmu
		x11-libs/libxcb:=
	)
	jpeg? ( media-libs/libjpeg-turbo:0= )
	mpi? (
		sci-libs/metis
		virtual/mpi
	)
	opencascade? ( sci-libs/opencascade:= )
	python? (
		${PYTHON_DEPS}
		$(python_gen_cond_dep '
			dev-python/numpy[${PYTHON_USEDEP}]
			dev-python/pybind11[${PYTHON_USEDEP}]
			'
		)
		mpi? (
			$(python_gen_cond_dep 'dev-python/mpi4py[${PYTHON_USEDEP}]' )
		)
	)
"
RDEPEND="${DEPEND}"
BDEPEND="
	sys-apps/lsb-release
	virtual/pkgconfig
	gui? ( virtual/imagemagick-tools[png] )
	test? (
		dev-cpp/catch
		python? ( $(python_gen_cond_dep '
			dev-python/pytest-check[${PYTHON_USEDEP}]
		') )
	)
"

PATCHES=(
	"${FILESDIR}/${PN}-6.2.2204-find-Tk-include-directories.patch"
	"${FILESDIR}/${PN}-6.2.2406-link-against-ffmpeg.patch"
	# "${FILESDIR}/${PN}-6.2.2406-find-libjpeg-turbo-library.patch"
	"${FILESDIR}/${PN}-6.2.2301-fix-nullptr-deref-in-archive.patch"
	"${FILESDIR}/${PN}-6.2.2406-encoding_h.patch"
	"${FILESDIR}/${PN}-6.2.2406-link-against-jpeg.patch"
	"${FILESDIR}/${PN}-PR202-std_map.patch"
	"${FILESDIR}/${PN}-PR206-catch2-v3.patch"
)

pkg_setup() {
	if use python; then
			python-single-r1_pkg_setup

			# # NOTE This calls find_package(Python3) without specifying Interpreter in COMPONENTS.
			# # Python3_FIND_UNVERSIONED_NAMES=FIRST is thus never checked and we search the highest python version first.
			# pushd "${T}/${EPYTHON}/bin" > /dev/null || die
			# cp "python-config" "${EPYTHON}-config" || die
			# chmod +x "${EPYTHON}-config" || die
			# popd > /dev/null || die
	fi
}

src_prepare() {
	# NOTE: need to manually check and update this string on version bumps!
	# git ls-remote --tags https://github.com/NGSolve/netgen.git refs/tags/v${PV} | cut -c-8
	# git describe --tags --match "v[0-9]*" --long --dirty
	# cat <<- EOF > "${S}/version.txt" || die
	# 	v${PV}-0-gd1a9f7ee
	# EOF

	# 855214 needs git
	sed \
		-e '/-DBDIR=${CMAKE_CURRENT_BINARY_DIR}/a -DNETGEN_VERSION_GIT=${NETGEN_VERSION_GIT}' \
		-i CMakeLists.txt || die

	if use python; then
		sed \
			-e "s/Python3_EXECUTABLE/PYTHON_EXECUTABLE/" \
			-i cmake/NetgenConfig.cmake.in || die
	fi

	rm -r external_dependencies || die

	cmake_src_prepare
}

src_configure() {
	# TODO BUG
	# /var/tmp/paludis/media-gfx-netgen-6.2.2601/work/netgen-6.2.2601/libsrc/core/simd_sse.hpp:
	# In member function ‘int64_t ngcore::SIMD<long int, 2>::Lo() const’:
	# /var/tmp/paludis/media-gfx-netgen-6.2.2601/work/netgen-6.2.2601/libsrc/core/simd_sse.hpp:74:48:
	# error: dereferencing type-punned pointer will break strict-aliasing rules [-Werror=strict-aliasing]
	#    74 |     NETGEN_INLINE int64_t Lo() const { return ((int64_t*)(&data))[0]; }
	append-cflags -fno-strict-aliasing
	append-cxxflags -fno-strict-aliasing

	local mycmakeargs=(
		# currently not working in a sandbox, expects netgen to be installed
		# see https://github.com/NGSolve/netgen/issues/132
		-DBUILD_STUB_FILES=OFF
		-DENABLE_UNIT_TESTS=$(usex test)
		-DINSTALL_PROFILES=OFF
		-DNG_INSTALL_DIR_CMAKE="$(get_libdir)/cmake/${PN}"
		-DNG_INSTALL_DIR_INCLUDE="include/${PN}"
		-DNG_INSTALL_DIR_LIB="$(get_libdir)"
		-DUSE_CCACHE=OFF
		# doesn't build with this version
		-DUSE_CGNS=no
		-DUSE_GUI=$(usex gui)
		-DUSE_INTERNAL_TCL=OFF
		-DUSE_JPEG=$(usex jpeg)
		-DUSE_MPEG=$(usex ffmpeg)
		# respect users -march= choice
		-DUSE_NATIVE_ARCH=OFF
		-DUSE_MPI=$(usex mpi)
		-DUSE_OCC=$(usex opencascade)
		-DUSE_PYTHON="$(usex python)"
		-DUSE_SUPERBUILD=OFF
	)

	if [[ ${PV} != *9999* ]]; then
		mycmakeargs+=(
			-DNETGEN_VERSION_GIT="v${PV}-0-gentoo"
		)
	fi

	# no need to set this, if we only build the library
	if use gui; then
		mycmakeargs+=(
			-DTK_INCLUDE_PATH="${ESYSROOT}/usr/$(get_libdir)/tk${TCL_SLOT}/include"
		)
	fi

	if use python; then
		append-cppflags -DPYBIND11_NO_ASSERT_GIL_HELD_INCREF_DECREF

		mycmakeargs+=(
			-DPREFER_SYSTEM_PYBIND11=ON
			# needed, so the value gets passed to NetgenConfig.cmake instead of ${T}/pythonX.Y
			-DPYTHON_EXECUTABLE="${PYTHON}"
		)
	fi

	if use mpi && use python; then
		mycmakeargs+=( -DUSE_MPI4PY=ON )
	else
		mycmakeargs+=( -DUSE_MPI4PY=OFF )
	fi

	cmake_src_configure
}

src_test() {
	DESTDIR="${T}" cmake_build install

	if use python; then
		local -x PYTEST_DISABLE_PLUGIN_AUTOLOAD=1
		local -x NETGENDIR="${T}/usr/bin"
		local -x PYTHONPATH="${T}$(python_get_sitedir):${T}/usr/$(get_libdir):${BUILD_DIR}/libsrc/core"
	fi

	CMAKE_SKIP_TESTS=(
		'^unit_symboltable$'
		'^pytest$' # floating point errors
		'^pytest-mpi$' # needs pytest-mpi
	)
	cmake_src_test

	rm -r "${T}/usr" || die
}

src_install() {
	cmake_src_install

	use python && python_optimize

	local NETGENDIR="/usr/share/${PN}"
	echo -e "NETGENDIR=${NETGENDIR}" > ./99netgen || die
	doenvd 99netgen

	if use gui; then
		mv "${ED}"/usr/bin/{*.tcl,*.ocf} "${ED}${NETGENDIR}" || die

		convert -deconstruct "${S}/windows/${PN}.ico" netgen.png || die
		newicon -s 32 "${S}/${PN}-2.png" "${PN}.png"
		newicon -s 16 "${S}/${PN}-3.png" "${PN}.png"
		make_desktop_entry "${PN}" "Netgen" netgen Graphics
	fi

	mv "${ED}/usr/share/${PN}/doc/ng4.pdf" "${ED}/usr/share/doc/${PF}" || die
	dosym -r "/usr/share/doc/${PF}/ng4.pdf" "/usr/share/${PN}/doc/ng4.pdf"

	use python || rm -r "${ED}${NETGENDIR}/py_tutorials" || die
}