# Copyright 1999-2005 Gentoo Foundation
# Distributed under the terms of the GNU General Public License v2
# $Header: $

inherit eutils toolchain-funcs
DESCRIPTION="The Scalable Parallel Random Number Generators Library"
HOMEPAGE="http://sprng.cs.fsu.edu"
SRC_URI="http://sprng.cs.fsu.edu/Version4.0/${PN}4.tar.gz"
LICENSE="as-is"
SLOT="0"
KEYWORDS="~x86 ~amd64 ~mips"
IUSE="doc fortran mpi"
DEPEND="dev-libs/gmp
	mpi? ( || (sys-cluster/mpich sys-cluster/mpich2 ) )"

# package folder is explicit
#S="${WORKDIR}/${PN}4"

# Where should the executables go?
EXECDIR="${ROOT}/usr/bin"

# BIG WARNING!
#	The fortran interface currently does not work.  Do not use fortran!
#	This is currently believed to be a problem with the sprng source code.

src_compile() {
	PLAT="GENERIC"
	ARCH=`uname -m`

	# Edit make.CHOICES to refer to make.GENERIC
	einfo "Compiling sprng for ${PLAT} platform"
	sed -i "s/^PLAT = INTEL/#PLAT = INTEL/g" make.CHOICES
	sed -i "s/^#PLAT  = GENERIC/PLAT  = GENERIC/g" make.CHOICES

	# Get the proper c compiler
	sed -i "s:^CC = gcc:CC = $(tc-getCC):g" SRC/make.GENERIC

	# Edit make.CHOICES and make.GENERIC if using MPI
	if use mpi; then
		einfo "compiling with mpi support"
		sed -i "s/^#MPIDEF = -DSPRNG_MPI/MPIDEF = -DSPRING-MPI/g" make.CHOICES
		sed -i "s/^MPIF77 = \$(F77)/MPIF77 = mpif77/g" SRC/make.GENERIC
		sed -i "s/^MPICC = \$(CC)/MPICC = mpicc/g" SRC/make.GENERIC
		sed -i "s/^MPILIB =/MPILIB = -lmpich -lrt/g" SRC/make.GENERIC
	else
		einfo "compiling without mpi support"
	fi	

	# Edit make.GENERIC for fortran use
	if use fortran; then
		einfo "compiling with fortran support"
		sed -i "s:^F77 = f77:F77 = $(tc-getF77):g" SRC/make.GENERIC
		sed -i "s/-DAdd_/-DAdd__/g" SRC/make.GENERIC
	else
		einfo "compiling without fortran support"
		sed -i "s/^F77 = f77/F77 = echo/g" SRC/make.GENERIC
	fi

	# Edit make.GENERIC to add  ranlib support
	sed -i "s/^RANLIB = echo/#RANLIB = echo/g" SRC/make.GENERIC
	sed -i "s/^#RANLIB = ranlib/RANLIB=ranlib/g" SRC/make.GENERIC
	
	# Change -O flag to -O2
	sed -i "s/-O/-O2/g" SRC/make.GENERIC	

	# The compilation of pmlcg is complicated by sprng including gmp.h in the
	# sprng/SRC/pmlcg directory.  The resident gentoo developer (joelm)
	# thinks that this is the wrong way to do things.  The following
	# makes it work the right way by:
	#
	#	1) removing gmp.h from .../SRC/pmlcg
	#	2) creating a new gmp.h in .../SRC/pmlcg
	#		with line #include <gmp.h>
	#

	# Remove gmp.h from sprng-2.0/SRC/pmlcg
	rm SRC/pmlcg/gmp.h

	# add #include <gmp.h> to gmp.h
	echo "#include <gmp.h>" > SRC/pmlcg/gmp.h

	# Compile. Sprng Makefile is weird and emake doesn't like it.
	# Using make.
	cd SRC 
	make || die "make failed"
	cd ..
}

src_test() {
	ARCH=`uname -m`
	cd ${S}
	# We need to change the default example make to serial + parallel
	# if using mpi
	if use mpi ; then 
		sed -i "s/^serial : \$(EX)/serial : \$(EX) \$(MPIEX)/g" EXAMPLES/Makefile
	fi	

	# make examples and tests
	make || die "Test/Examples make failed"

	# Run Tests
	einfo "Beginning test suite"
	./checksprng | tee tests.log
}

src_install() {
	#Examples List:
	EXLIST="sprng seed checkpoint invalid_ID sprng-simple simple-simple \
	seed-simple checkpoint-simple spawn sprngf seedf checkpointf invalid_IDf \
	spawnf sprngf-simple simplef-simple seedf-simple checkpointf-simple \
	pi-simple pif-simple"
	
	#Mpi Examples List:
	MPIEXLIST="sprng_mpi fsprng_mpi 2streams_mpi seed_mpi message_mpi \
	sprng-simple_mpi fsprng-simple_mpi seed-simple_mpi message-simple_mpi \
	sprngf_mpi fsprngf_mpi seedf_mpi messagef_mpi 2streamsf_mpi  \
	sprngf-simple_mpi fsprngf-simple_mpi seedf-simple_mpi \
	messagef-simple_mpi pi-simple_mpi"

	#Tests List:
	TESTSLIST="maxt collisions equidist serial gap perm runs coupon poker \
	sumrandom_walk wolff metropolis"

	cd ${S}
	dolib lib/libsprng*.a
	insinto /usr/include
	doins include/interface.h include/sprng.h
	if use fortran; then
		doins include/sprng_f.h
	fi

	dodoc DOCS/README
	if use doc; then
		echo ">>> Unpacking ${PN}.html.tar.Z to $PWD/DOCS"
		cd DOCS && tar -Zxf ${PN}.html.tar.Z
		dohtml www/*
	fi

	cd ${S}/EXAMPLES
	dobin ${EXLIST}
	use mpi && dobin ${MPIEXLIST}
	
	cd ${S}/TESTS
	dobin *.sprng
}