# 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 *
import os


class Mpich(AutotoolsPackage):
    """MPICH is a high performance and widely portable implementation of
    the Message Passing Interface (MPI) standard."""

    homepage = "http://www.mpich.org"
    url      = "http://www.mpich.org/static/downloads/3.0.4/mpich-3.0.4.tar.gz"
    git      = "https://github.com/pmodels/mpich.git"
    list_url = "http://www.mpich.org/static/downloads/"
    list_depth = 1

    version('develop', submodules=True)
    version('3.2.1', 'e175452f4d61646a52c73031683fc375')
    version('3.2',   'f414cfa77099cd1fa1a5ae4e22db508a')
    version('3.1.4', '2ab544607986486562e076b83937bba2')
    version('3.1.3', '93cb17f91ac758cbf9174ecb03563778')
    version('3.1.2', '7fbf4b81dcb74b07ae85939d1ceee7f1')
    version('3.1.1', '40dc408b1e03cc36d80209baaa2d32b7')
    version('3.1',   '5643dd176499bfb7d25079aaff25f2ec')
    version('3.0.4', '9c5d5d4fe1e17dd12153f40bc5b6dbc0')

    variant('hydra', default=True,  description='Build the hydra process manager')
    variant('pmi',   default=True,  description='Build with PMI support')
    variant('romio', default=True,  description='Enable ROMIO MPI I/O implementation')
    variant('verbs', default=False, description='Build support for OpenFabrics verbs.')
    variant(
        'device',
        default='ch3',
        description='''Abstract Device Interface (ADI)
implementation. The ch4 device is currently in experimental state''',
        values=('ch3', 'ch4'),
        multi=False
    )
    variant(
        'netmod',
        default='tcp',
        description='''Network module. Only single netmod builds are
supported. For ch3 device configurations, this presumes the
ch3:nemesis communication channel. ch3:sock is not supported by this
spack package at this time.''',
        values=('tcp', 'mxm', 'ofi', 'ucx'),
        multi=False
    )

    provides('mpi')
    provides('mpi@:3.0', when='@3:')
    provides('mpi@:1.3', when='@1:')

    filter_compiler_wrappers(
        'mpicc', 'mpicxx', 'mpif77', 'mpif90', 'mpifort', relative_root='bin'
    )

    # fix MPI_Barrier segmentation fault
    # see https://lists.mpich.org/pipermail/discuss/2016-May/004764.html
    # and https://lists.mpich.org/pipermail/discuss/2016-June/004768.html
    patch('mpich32_clang.patch', when='@3.2:3.2.0%clang')

    depends_on('findutils', type='build')

    depends_on('libfabric', when='netmod=ofi')

    conflicts('device=ch4', when='@:3.2')
    conflicts('netmod=ofi', when='@:3.1.4')
    conflicts('netmod=ucx', when='device=ch3')
    conflicts('netmod=mxm', when='device=ch4')
    conflicts('netmod=mxm', when='@:3.1.3')
    conflicts('netmod=tcp', when='device=ch4')

    def setup_dependent_environment(self, spack_env, run_env, dependent_spec):
        # TUTORIAL: set the following variables for dependents:
        #
        # MPICC=join_path(self.prefix.bin, 'mpicc')
        # MPICXX=join_path(self.prefix.bin, 'mpic++')
        # MPIF77=join_path(self.prefix.bin, 'mpif77')
        # MPIF90=join_path(self.prefix.bin, 'mpif90')
        # MPICH_CC=spack_cc
        # MPICH_CXX=spack_cxx
        # MPICH_F77=spack_f77
        # MPICH_F90=spack_fc
        # MPICH_FC=spack_fc
        pass

    def setup_dependent_package(self, module, dependent_spec):
        if 'platform=cray' in self.spec:
            self.spec.mpicc = spack_cc
            self.spec.mpicxx = spack_cxx
            self.spec.mpifc = spack_fc
            self.spec.mpif77 = spack_f77
        else:
            self.spec.mpicc = join_path(self.prefix.bin, 'mpicc')
            self.spec.mpicxx = join_path(self.prefix.bin, 'mpic++')
            self.spec.mpifc = join_path(self.prefix.bin, 'mpif90')
            self.spec.mpif77 = join_path(self.prefix.bin, 'mpif77')

        self.spec.mpicxx_shared_libs = [
            join_path(self.prefix.lib, 'libmpicxx.{0}'.format(dso_suffix)),
            join_path(self.prefix.lib, 'libmpi.{0}'.format(dso_suffix))
        ]

    def autoreconf(self, spec, prefix):
        """Not needed usually, configure should be already there"""
        # If configure exists nothing needs to be done
        if os.path.exists(self.configure_abs_path):
            return
        # Else bootstrap with autotools
        bash = which('bash')
        bash('./autogen.sh')

    @run_before('autoreconf')
    def die_without_fortran(self):
        # Until we can pass variants such as +fortran through virtual
        # dependencies depends_on('mpi'), require Fortran compiler to
        # avoid delayed build errors in dependents.
        if (self.compiler.f77 is None) or (self.compiler.fc is None):
            raise InstallError(
                'Mpich requires both C and Fortran compilers!'
            )

    def configure_args(self):
        spec = self.spec
        config_args = [
            '--enable-shared',
            '--with-pm={0}'.format('hydra' if '+hydra' in spec else 'no'),
            '--with-pmi={0}'.format('yes' if '+pmi' in spec else 'no'),
            '--{0}-romio'.format('enable' if '+romio' in spec else 'disable'),
            '--{0}-ibverbs'.format('with' if '+verbs' in spec else 'without')
        ]

        # setup device configuration
        device_config = ''
        if 'device=ch4' in spec:
            device_config = '--with-device=ch4:'
        elif 'device=ch3' in spec:
            device_config = '--with-device=ch3:nemesis:'

        if 'netmod=ucx' in spec:
            device_config += 'ucx'
        elif 'netmod=ofi' in spec:
            device_config += 'ofi'
        elif 'netmod=mxm' in spec:
            device_config += 'mxm'
        elif 'netmod=tcp' in spec:
            device_config += 'tcp'

        config_args.append(device_config)

        return config_args
