# Copyright 2013-2018 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 Migrate(AutotoolsPackage):
    """Migrate estimates effective population sizes and past migration rates
       between n population assuming a migration matrix model with asymmetric
       migration rates and different subpopulation sizes"""

    homepage = "http://popgen.sc.fsu.edu/"
    url      = "http://popgen.sc.fsu.edu/currentversions/migrate-3.6.11.src.tar.gz"

    version('3.6.11', sha256='a9ba06a4e995a45b8d04037f5f2da23e1fe64a2f3565189bdd50c62c6fe01fb8')

    variant('mpi', default=False,
            description='Build MPI binaries')

    depends_on('autoconf')
    depends_on('automake')
    depends_on('libtool')
    depends_on('m4')

    depends_on('openmpi', type=('build', 'link', 'run'), when='+mpi')

    configure_directory = 'src'

    def build(self, spec, prefix):
        with working_dir('src'):
            # this software is written with parts both in C and C++.
            # it tries to link using gcc which causes problems, so this package
            # explicitly links with g++ (CXX) instead.

            # spack's FileFilter/filter_file only work per-line (see docs),
            # so the package uses a custom filter by replacing substrings
            # in the Makefile.

            mfc = ''
            with open('Makefile') as m:
                mfc = mfc_old = m.read()

                # replace linking step
                mfc = mfc.replace('$(NAME): $(PRODUCT_DEPENDS)\n\t$(CC)',
                                  '$(NAME): $(PRODUCT_DEPENDS)\n\t$(CXX)')
                mfc = mfc.replace('$(MPINAME): $(PRODUCT_DEPENDS)\n\t$(CC)',
                                  '$(MPINAME): $(PRODUCT_DEPENDS)\n\t$(CXX)')

                # make sure the replace worked
                if (mfc == mfc_old):
                    raise InstallError('Failed to update linker command')

                # don't try to install MPI binaries that aren't there
                if '+mpi' not in spec:
                    line = '$(INSTALL) $(IFLAGS) $(MPINAME) $(INSTALLDIR)'
                    mfc = mfc.replace(line, '')

            # write modified makefile back
            with open('Makefile', 'w') as m:
                m.write(mfc)

            make()
            if '+mpi' in spec:
                make('mpis')

    def install(self, spec, prefix):
        mkdirp(prefix.man)
        with working_dir('src'):
            make('install')