##############################################################################
# Copyright (c) 2017, Los Alamos National Security, LLC
# Produced at the Los Alamos National Laboratory.
#
# This file is part of Spack.
# Created by Todd Gamblin, tgamblin@llnl.gov, All rights reserved.
# LLNL-CODE-647188
#
# For details, see https://github.com/llnl/spack
# Please also see the NOTICE and LICENSE files for our notice and the LGPL.
#
# This program is free software; you can redistribute it and/or modify
# it under the terms of the GNU Lesser General Public License (as
# published by the Free Software Foundation) version 2.1, February 1999.
#
# This program is distributed in the hope that it will be useful, but
# WITHOUT ANY WARRANTY; without even the IMPLIED WARRANTY OF
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the terms and
# conditions of the GNU Lesser General Public License for more details.
#
# You should have received a copy of the GNU Lesser General Public
# License along with this program; if not, write to the Free Software
# Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
##############################################################################

from spack import *


class Legion(CMakePackage):
    """Legion is a data-centric parallel programming system for writing
       portable high performance programs targeted at distributed heterogeneous
       architectures. Legion presents abstractions which allow programmers to
       describe properties of program data (e.g. independence, locality). By
       making the Legion programming system aware of the structure of program
       data, it can automate many of the tedious tasks programmers currently
       face, including correctly extracting task- and data-level parallelism
       and moving data around complex memory hierarchies. A novel mapping
       interface provides explicit programmer controlled placement of data in
       the memory hierarchy and assignment of tasks to processors in a way
       that is orthogonal to correctness, thereby enabling easy porting and
       tuning of Legion applications to new architectures.
    """
    homepage = "http://legion.stanford.edu/"
    url      = "https://github.com/StanfordLegion/legion/tarball/legion-17.02.0"

    version('develop', git='https://github.com/StanfordLegion/legion', branch='master')
    version('17.02.0', '31ac3004e2fb0996764362d2b6f6844a')

    variant('mpi', default=True,
            description='Build on top of mpi conduit for mpi inoperability')
    variant('shared', default=True, description='Build shared libraries')

    depends_on("cmake@3.1:", type='build')
    depends_on("gasnet", when='~mpi')
    depends_on("gasnet+mpi", when='+mpi')

    def cmake_args(self):
        options = [
            '-DLegion_USE_GASNet=ON',
            '-DLegion_BUILD_EXAMPLES=ON',
            '-DBUILD_SHARED_LIBS=%s' % ('+shared' in self.spec)]

        if '+mpi' in self.spec:
            options.append('-DGASNet_CONDUIT=mpi')

        return options
