# Copyright 1999-2008 Gentoo Foundation
# Distributed under the terms of the GNU General Public License v3
# $Header: $

inherit versionator eutils
MY_PV=$(replace_version_separator 1 '')

DESCRIPTION="CERN's detector description and simulation Tool"
HOMEPAGE="http://geant4.cern.ch"
SRC_URI="http://geant4.web.cern.ch/geant4/support/source/${PN}${PV}.gtar.gz"
LICENSE="geant4"
SLOT="0"
KEYWORDS="~x86"
IUSE="+data qt4 +motif debug openinventor +raytracerx +vrml +openglx openglqt openglxm gdml MOMO g4py"
# data: install data files for geant4
# motif/qt4: use * as widget set, qt4 is considered experimental by upstream

# TODO
# openinventor, openglqt: not tested
# Xaw: Athena Widgets support -- ebuild available??

RDEPEND="data? (sci-physics/geant4-data)"
DEPEND="
	sci-physics/clhep
	qt4?          (>=x11-libs/qt-4)
	motif?        (x11-libs/openmotif)
	openinventor? (media-libs/openinventor)
	raytracerx?   (x11-base/xorg-server)
	openglx?      (virtual/opengl)
	openglqt?     (x11-libs/qt-opengl)
	openglxm?     (x11-libs/Xaw3d)
	gdml?         (dev-libs/xerces-c)"
	# TODO Xaw?          (x11-libs/Xaw)

S="${WORKDIR}/${PN}${PV}"
FEATURE="sandbox collision-protect"

src_unpack()
{
	tar -xf ${DISTDIR}/${PN}${PV}.gtar.gz -C ${WORKDIR}

	cd "${S}"
	epatch "${FILESDIR}/0001-Ebuildify.patch"
	epatch "${FILESDIR}/0002-changed-config-env-sh.patch"
}

pkg_setup()
{
	eval unset ${!G4_*}
}

src_compile()
{
	if ! use data; then
		ewarn "You should always emerge sci-physics/geant4-data together with Geant4"
		ewarn "  (unless you know what you are doing)."
	fi

	cd "${WORKDIR}/${PN}${PV}"
	MYOPTS=""
	if use qt4; then            MYOPTS+='-D g4ui_use_qt=y '
	elif use motif; then
								MYOPTS+="-D g4vis_xmhome=/usr/include/openmotif-2.3"
								MYOPTS+="-D g4ui_use_xm=y"
	#elif use Xaw; then          MYOPTS+="-D g4ui_use_xaw=y " # no ebuild?
	elif use debug; then        MYOPTS+="-D g4debug=y "
	elif use openinventor; then MYOPTS+="-D g4debug=y "
	elif use raytracerx; then   MYOPTS+="-D g4vis_use_raytracerx=y "
	elif use openglx; then      MYOPTS+="-D g4vis_use_openglx=y "
	elif use openglqt; then     MYOPTS+="-D g4vis_use_openglqt=y "
	elif use openglxm; then     MYOPTS+="-D g4vis_use_openglxm=y "
	elif use gdml; then         MYOPTS+="-D g4lib_build_gdml=y "
	elif use vrml; then         MYOPTS+="-D g4vis_use_vrml=y "
	fi

	einfo "Configuring build -- no input needed."
	einfo "Building will take a looooong time. If you only care about this build"
	einfo "being done, now is the time to do something else."
	epause 3

	DATA="/usr/share/geant4/data/"
	./Configure -build -d -e -s -O \
		-D g4lib_build_shared=y \
		-D g4lib_build_static=y \
		-D g4debug=n \
		-D g4ui_none=n \
		-D g4ui_use_xaw=n \
		-D g4ui_use_xm=n \
		-D g4ui_use_qt=n \
		-D g4vis_none=n \
		-D g4vis_use_openglx=n \
		-D g4vis_use_openglxm=n \
		-D g4vis_use_dawn=n \
		-D g4vis_use_oix=n \
		-D g4vis_use_raytracerx=n \
		-D g4vis_use_vrml=n \
		-D g4vis_use_openglqt=n \
		-D g4lib_build_gdml=n \
		-D g4lib_build_g3tog4=y \
		-D g4lib_build_zlib=n \
		-D g4analysis_use=n \
		-D g4includes_flag=y \
		-D g4include="${D}/usr/include/geant4/" \
		-D g4final_install="${D}/usr" \
		-D g4levelgammadata="${DATA}/PhotonEvaporation" \
		-D g4radioactivedata="${DATA}/RadioactiveDecay" \
		-D g4ledata="${DATA}/G4EMLOW" \
		-D g4neutronhpcrosssections="${DATA}/G4NDL" \
		-D g4abladata="${DATA}/G4ABLA" \
		$MYOPTS || die "Install failed"
}

src_install()
{
	cd "${WORKDIR}/${PN}${PV}"
	./Configure -install -s 
	./Configure
	dodoc LICENSE ReleaseNotes/ReleaseNotes"${PV}".*

	insinto /usr/share/geant4/environments

	mv "${D}"/usr/src/geant4/examples "${D}"/usr/share/geant4/
	if use MOMO; then 
		mv "${D}"/usr/src/geant4/environments/MOMO "${D}"/usr/share/geant4/
	fi
	if use g4py; then 
		mv "${D}"/usr/src/geant4/environments/g4py "${D}"/usr/share/geant4/
	fi

	mv config/ "${D}"/usr/share/geant4/

	sed -i -e "s~${WORKDIR}/${PN}${PV}~/usr/share/geant4/~g" env.* || die "Install failed" # G4INSTALL
	sed -i -e "s~${D}~/~g" env.*                                   || die "Install failed" # all the rest

	## TODO this breaks a lot of stuff
	# mv "${D}"/usr/lib/geant4/Linux-g++/* "${D}"/usr/lib/geant4/
	# rmdir "${D}"/usr/lib/geant4/Linux-g++/
	# sed -i -e "s~\${G4LIB}/\${G4SYSTEM}~\${G4LIB}~g" env.*         || die "Install failed" # G4LIB

	doins env.csh env.sh

	rm -rf "${D}"/usr/src/ 
}

pkg_postinst() {
	elog "Please make sure you set the environment variables needed for Geant4."
	elog "/usr/share/geant4/environments contains environment scripts for some shells,"
	# tell user how to polute environment
	elog "so that e.g. for bash"
	elog "     source /usr/share/geant4/environments/env.sh"
	elog "will set everything Geant4 wants."
	elog ""
	elog "/usr/share/geant4/examples/ contains examples to get you started."
}