# Copyright 1999-2022 Gentoo Authors
# Distributed under the terms of the GNU General Public License v2

EAPI=7

PYTHON_COMPAT=( python3_{8..10} )

inherit cmake python-single-r1

MY_P=${PN}$(ver_cut 1)-v$(ver_cut 2-4)

case ${PV} in
*_beta*)
	DOCS="ReleaseNotes/Beta.$(ver_cut 2-3)-*.txt"
	;;
*)
	if [[ $(ver_cut 4) -gt 0 ]]; then
		DOCS="ReleaseNotes/Patch.$(ver_cut 2-3)-*.txt"
	fi
	HTML_DOCS="ReleaseNotes/ReleaseNotes.$(ver_cut 2-3).html"
	;;
esac

DESCRIPTION="Toolkit for simulation of passage of particles through matter"
HOMEPAGE="https://geant4.web.cern.ch/"
SRC_URI="https://geant4-data.web.cern.ch/geant4-data/releases/${MY_P}.tar.gz"

LICENSE="geant4"
SLOT="4"
KEYWORDS="amd64 ~x86 ~amd64-linux ~x86-linux"
IUSE="+c++17 c++20 +data debug doc examples freetype gdml geant3 hdf5 inventor motif opengl
	python qt5 raytracerx static-libs tbb threads vtk"

REQUIRED_USE="
	^^ ( c++17 c++20 )
	inventor? ( opengl )
	motif? ( opengl )
	python? ( ${PYTHON_REQUIRED_USE} )
	qt5? ( opengl )
	tbb? ( threads )
	vtk? ( qt5 )
"

RDEPEND="
	dev-libs/expat
	>=sci-physics/clhep-2.4.5.1:2=[threads?]
	data? ( ~sci-physics/geant-data-4.11.0.0 )
	doc? ( app-doc/geant-docs )
	gdml? ( dev-libs/xerces-c )
	hdf5? ( sci-libs/hdf5[threads?] )
	inventor? ( media-libs/SoXt )
	motif? ( x11-libs/motif:0 )
	opengl? ( virtual/opengl )
	python? (
		${PYTHON_DEPS}
		$(python_gen_cond_dep '
			dev-libs/boost:=[${PYTHON_USEDEP}]
		')
	)
	qt5? (
		dev-qt/qt3d:5
		dev-qt/qtcore:5
		dev-qt/qtgui:5
		dev-qt/qtprintsupport:5
		dev-qt/qtwidgets:5
		opengl? ( dev-qt/qtopengl:5 )
	)
	raytracerx? (
		x11-libs/libX11
		x11-libs/libXmu
	)
	vtk? (
		sci-libs/vtk:=[qt5]
	)"

S="${WORKDIR}/${MY_P}"

src_configure() {
	local mycmakeargs=(
		-DCMAKE_INSTALL_DATADIR="${EPREFIX}/usr/share/geant4"
		-DCMAKE_CXX_STANDARD=$( (usev c++17 || usev c++20) | cut -c4-)
		-DGEANT4_BUILD_BUILTIN_BACKTRACE=$(usex debug)
		-DGEANT4_BUILD_MULTITHREADED=$(usex threads)
		-DGEANT4_BUILD_STORE_TRAJECTORY=OFF
		-DGEANT4_BUILD_TLS_MODEL=$(usex threads global-dynamic initial-exec)
		-DGEANT4_BUILD_VERBOSE_CODE=$(usex debug)
		-DGEANT4_INSTALL_DATA=OFF
		-DGEANT4_INSTALL_DATADIR="${EPREFIX}/usr/share/geant4/data"
		-DGEANT4_INSTALL_EXAMPLES=$(usex examples)
		-DGEANT4_INSTALL_PACKAGE_CACHE=OFF
		-DGEANT4_USE_FREETYPE=$(usex freetype)
		-DGEANT4_USE_G3TOG4=$(usex geant3)
		-DGEANT4_USE_GDML=$(usex gdml)
		-DGEANT4_USE_HDF5=$(usex hdf5)
		-DGEANT4_USE_INVENTOR=$(usex inventor)
		-DGEANT4_USE_OPENGL_X11=$(usex opengl)
		-DGEANT4_USE_PYTHON=$(usex python)
		-DGEANT4_USE_QT=$(usex qt5)
		-DGEANT4_USE_RAYTRACER_X11=$(usex raytracerx)
		-DGEANT4_USE_SYSTEM_CLHEP=ON
		-DGEANT4_USE_SYSTEM_EXPAT=ON
		-DGEANT4_USE_SYSTEM_ZLIB=ON
		-DGEANT4_USE_TBB=$(usex tbb)
		-DGEANT4_USE_XM=$(usex motif)
		-DGEANT4_USE_VTK=$(usex vtk)
		-DBUILD_STATIC_LIBS=$(usex static-libs)
	)

	if use python; then
		mycmakeargs+=(
			-DPYTHON_EXECUTABLE="${EPREFIX}/usr/bin/${EPYTHON}"
			-DCMAKE_INSTALL_PYTHONDIR="${EPREFIX}/usr/lib/${EPYTHON}/site-packages"
		)
	fi

	[ -v EXTRA_ECONF ] && mycmakeargs+=( ${EXTRA_ECONF} )

	cmake_src_configure
}

src_install() {
	# adjust clhep linking flags for system clhep
	# binmake.gmk is only useful for legacy build systems
	sed -i -e 's/-lG4clhep/-lCLHEP/' config/binmake.gmk || die
	cmake_src_install
	use python && python_optimize
	rm "${ED}"/usr/bin/*.{sh,csh} || die "failed to remove obsolete shell scripts"

	einstalldocs
}