# Copyright 2013-2019 Lawrence Livermore National Security, LLC and other
# Spack Project Developers. See the top-level COPYRIGHT file for details.
#
# SPDX-License-Identifier: (Apache-2.0 OR MIT)

from spack import *


class Cosp2(MakefilePackage):
    """Proxy Application. CoSP2 represents a sparse linear algebra
        parallel algorithm for calculating the density matrix in electronic
        tructure theory. The algorithm is based on a recursive second-order
        Fermi-Operator expansion method (SP2) and is tailored for density
        functional based tight-binding calculations of non-metallic systems.
    """

    tags = ['proxy-app']

    homepage = "http://www.exmatex.org/cosp2.html"
    git      = "https://github.com/exmatex/CoSP2.git"

    version('master', branch='master')

    variant('double', default=True,
            description='Build with double precision.')
    variant('mpi', default=True, description='Build with MPI Support')

    depends_on('mpi', when='+mpi')

    build_directory = 'src-mpi'

    def edit(self, spec, prefix):
        cc = spack_cc

        if '+mpi' in spec:
            cc = spec['mpi'].mpicc

        with working_dir(self.build_directory):
            makefile = FileFilter('Makefile.vanilla')
            makefile.filter(r'^CC\s*=.*', 'CC = {0}'.format(cc))

            if '+double' in spec:
                filter_file('DOUBLE_PRECISION = O.*', 'DOUBLE_PRECISION = OFF',
                            'Makefile.vanilla')
            copy('Makefile.vanilla', 'Makefile')

    def install(self, spec, prefix):
        install_tree('bin/', prefix.bin)
        install_tree('examples/', prefix.examples)
        install_tree('doc/', prefix.doc)
        install('src-mpi/Doxyfile', prefix.doc)
        install('README.md', prefix.doc)
        install('LICENSE.md', prefix.doc)
