EAPI=8

inherit toolchain-funcs

MV=$(ver_cut 1)$(ver_cut 2)

MY_P="${PN}${PV//./}"

LHA_VER="6.1"

HOMEPAGE="https://pythia.org/"

SRC_URI="https://pythia.org/download/${PN}${MV}/${MY_P}.tgz

	test? ( lhapdf? (

		https://www.hepforge.org/archive/lhapdf/pdfsets/${LHA_VER}/CT10.tar.gz

		https://www.hepforge.org/archive/lhapdf/pdfsets/${LHA_VER}/MRST2007lomod.tar.gz

		https://www.hepforge.org/archive/lhapdf/pdfsets/${LHA_VER}/NNPDF23_nlo_as_0119_qed_mc.tar.gz

		https://www.hepforge.org/archive/lhapdf/pdfsets/${LHA_VER}/NNPDF23_nnlo_as_0119_qed_mc.tar.gz

		https://www.hepforge.org/archive/lhapdf/pdfsets/${LHA_VER}/cteq66.tar.gz

		https://www.hepforge.org/archive/lhapdf/pdfsets/${LHA_VER}/cteq6l1.tar.gz

		https://www.hepforge.org/archive/lhapdf/pdfsets/${LHA_VER}/unvalidated/MRST2004qed.tar.gz

	) )"

SLOT="8"

LICENSE="GPL-2"

KEYWORDS="~amd64 ~x86 ~amd64-linux ~x86-linux"

IUSE="doc examples fastjet +hepmc lhapdf root test zlib"

RESTRICT="!test? ( test )"

RDEPEND="

	fastjet? ( sci-physics/fastjet )

	hepmc? ( sci-physics/hepmc:2= )

	lhapdf? ( sci-physics/lhapdf:= )

	zlib? ( sys-libs/zlib )"

# ROOT is used only when building related tests

DEPEND="${RDEPEND}

	test? (

		root? ( sci-physics/root:= )

	)"

PATCHES=(

	"${FILESDIR}"/${PN}8209-root-noninteractive.patch

)

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

pkg_pretend() {

	if use root && ! use test; then

		ewarn "ROOT support will only affect examples code build during test stage."

		ewarn "Since you have tests disabled, this is a no-op."

	fi

	PYTHIADIR="/usr/share/pythia8"

	EPYTHIADIR="${EPREFIX}${PYTHIADIR}"

	default

	# set datadir for xmldor in include file

	sed -i \

		-e "s|../share/Pythia8/xmldoc|${EPYTHIADIR}/xmldoc|" \

		include/Pythia8/Pythia.h || die

	# respect libdir, prefix, flags

	sed -i \

		-e "s|/lib|/$(get_libdir)|g" \

		-e "s|/usr|${EPREFIX}/usr|g" \

		-e "s|-O2|${CXXFLAGS}|g" \

		-e "s|Cint|Core|g" \

		configure || die

	sed -i 's|$(CXX) $^ -o $@ $(CXX_COMMON) $(CXX_SHARED)|$(CXX) $(LDFLAGS) $^ -o $@ $(CXX_COMMON) $(CXX_SHARED)|g' \

		Makefile || die

	sed -i 's|$(CXX)|$(CXX) $(LDFLAGS)|' examples/Makefile || die

	# we use lhapdf6 instead of lhapdf5

	# some PDFs changed, use something similar

	sed -i \

		-e "s|LHAPDF5|LHAPDF6|g" \

		-e "s|\.LHgrid||g" \

		-e "s|\.LHpdf||g" \

		-e "s|MRST2001lo|MRST2007lomod|g" \

		-e "s|cteq6ll|cteq6l1|g" \

		-e "s|cteq6m|cteq66|g" \

		examples/*.{cc,cmnd} || die

	# After lhapdf5->6 migration PDFs are identical within ~1/1000

	# https|//www.hepforge.org/archive/lhapdf/pdfsets/6.1/README

	sed -i \

		-e "s|1e-8|3e-1|g" \

		-e "s|nlo_as_0119_qed|nlo_as_0119_qed_mc|g" \

		-e "s|xmldoc|share/Pythia8/xmldoc|g" \

		examples/main54.cc || die

	# ask cflags from root

	sed -i "s|root-config|root-config --cflags|g" examples/Makefile || die

	sed -i \

		-e '/TARGETS=$(LOCAL_LIB)\/libpythia8\.a/d' \

		-e 's|libpythia8\.a$|libpythia8$(LIB_SUFFIX)|g' \

		Makefile || die

	sed -i 's|libpythia8\.a|libpythia8$(LIB_SUFFIX)|g' \

		examples/Makefile || die

# TODO: the following optional packages are out of Gentoo tree:

# - EvtGen http://atlas-computing.web.cern.ch/atlas-computing/links/externalDirectory/EvtGen/

# - PowHEG http://powhegbox.mib.infn.it/

# - ProMC  https://github.com/Argonne-National-Laboratory/ProMC/

	# homemade configure script

	./configure \

		--arch=Linux \

		--cxx="$(tc-getCXX)" \

		--enable-shared \

		--prefix="${EPREFIX}/usr" \

		--prefix-lib="$(get_libdir)" \

		--prefix-share="${EPYTHIADIR}" \

		$(usex fastjet "--with-fastjet3" "") \

		$(usex zlib "--with-gzip" "") \

		$(usex hepmc "--with-hepmc2" "") \

		$(usex lhapdf "--with-lhapdf6

			--with-lhapdf6-plugin=LHAPDF6.h

			--with-lhapdf6-lib=${EPREFIX}/usr/$(get_libdir)" "") \

		$(usex root "--with-root

			--with-root-include=${EPREFIX}/usr/include/root

			--with-root-lib=${EPREFIX}/usr/$(get_libdir)/root" "") \

		|| die

	# fix pythia config script

	sed -i \

		-e 's|pythia8/examples/Makefile.inc|pythia8/Makefile.inc|' \

		-e 's|LINE%=|LINE%%=|' \

		bin/pythia8-config || die

}

src_test() {

	cd examples || die

	local tests="$(echo main{{01..32},37,38,61,62,73,80}.out)"

	use hepmc && tests+=" $(echo main{41,42,85,86}.out)"

	use hepmc && use lhapdf && tests+=" $(echo main{43,{87..89}}.out)"

	use lhapdf && tests+=" $(echo main{51..54}.out)"

	use fastjet && tests+=" $(echo main{71,72}.out)"

	use fastjet && use hepmc && use lhapdf && tests+=" $(echo main{81..84}).out"

	use root && tests+=" main91.out"

	# Disabled tests:

	# 33	needs PowHEG

	# 46	needs ProMC

	# 48	needs EvtGen

	# 92	generated ROOT dictionary is badly broken

	# use emake for parallel instead of long runmains

	LD_LIBRARY_PATH="${S}/$(get_libdir):${LD_LIBRARY_PATH}" \

	PYTHIA8DATA="../share/Pythia8/xmldoc/" \

	LHAPDF_DATA_PATH="${WORKDIR}" \

	emake ${tests}

	emake clean

	# make install is too broken, much easier to install manually

	dobin bin/pythia8-config

	doheader -r include/*

	dolib.so lib/libpythia8.so

	use lhapdf && dolib.so lib/libpythia8lhapdf6.so

	insinto "${PYTHIADIR}"

	doins -r share/Pythia8/xmldoc examples/Makefile.inc

	newenvd - 99pythia8 <<- _EOF_

		PYTHIA8DATA=${EPYTHIADIR}/xmldoc

	_EOF_

	dodoc AUTHORS GUIDELINES README

	if use doc; then

		dodoc -r share/Pythia8/pdfdoc/.

		dodoc -r share/Pythia8/htmldoc/.

	fi

		# reuse system Makefile.inc

		rm examples/Makefile.inc || die

		sed -i "s|include Makefile.inc|include ${EPYTHIADIR}|" \

			examples/Makefile || die

		insinto /usr/share/${PN}

		doins -r examples

	# cleanup

	unset PYTHIADIR EPYTHIADIR