# 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)

import os
import sys
from spack import *


class Hydrogen(CMakePackage):
    """Hydrogen: Distributed-memory dense and sparse-direct linear algebra
       and optimization library. Based on the Elemental library."""

    homepage = "http://libelemental.org"
    url      = "https://github.com/LLNL/Elemental/archive/v1.0.1.tar.gz"
    git      = "https://github.com/LLNL/Elemental.git"

    version('develop', branch='hydrogen')
    version('1.1.0', sha256='b4c12913acd01c72d31f4522266bfeb8df1d4d3b4aef02e07ccbc9a477894e71')
    version('1.0.1', sha256='27cf76e1ef1d58bd8f9b1e34081a14a682b7ff082fb5d1da56713e5e0040e528')
    version('1.0', sha256='d8a97de3133f2c6b6bb4b80d32b4a4cc25eb25e0df4f0cec0f8cb19bf34ece98')

    variant('shared', default=True,
            description='Enables the build of shared libraries')
    variant('hybrid', default=True,
            description='Make use of OpenMP within MPI packing/unpacking')
    variant('openmp_blas', default=False,
            description='Use OpenMP for threading in the BLAS library')
    variant('quad', default=False,
            description='Enable quad precision')
    variant('int64', default=False,
            description='Use 64bit integers')
    variant('int64_blas', default=False,
            description='Use 64bit integers for BLAS.')
    variant('scalapack', default=False,
            description='Build with ScaLAPACK library')
    variant('build_type', default='Release',
            description='The build type to build',
            values=('Debug', 'Release'))
    variant('blas', default='openblas', values=('openblas', 'mkl', 'accelerate', 'essl'),
            description='Enable the use of OpenBlas/MKL/Accelerate/ESSL')
    variant('mpfr', default=False,
            description='Support GNU MPFR\'s'
            'arbitrary-precision floating-point arithmetic')
    variant('cuda', default=False,
            description='Builds with support for GPUs via CUDA and cuDNN')
    variant('test', default=False,
            description='Builds test suite')
    variant('al', default=False,
            description='Builds with Aluminum communication library')
    variant('omp_taskloops', default=False,
            description='Use OpenMP taskloops instead of parallel for loops.')

    # Note that #1712 forces us to enumerate the different blas variants
    depends_on('openblas', when='blas=openblas ~openmp_blas ~int64_blas')
    depends_on('openblas +ilp64', when='blas=openblas ~openmp_blas +int64_blas')
    depends_on('openblas threads=openmp', when='blas=openblas +openmp_blas ~int64_blas')
    depends_on('openblas threads=openmp +lip64', when='blas=openblas +openmp_blas +int64_blas')

    depends_on('intel-mkl', when="blas=mkl ~openmp_blas ~int64_blas")
    depends_on('intel-mkl +ilp64', when="blas=mkl ~openmp_blas +int64_blas")
    depends_on('intel-mkl threads=openmp', when='blas=mkl +openmp_blas ~int64_blas')
    depends_on('intel-mkl@2017.1 +openmp +ilp64', when='blas=mkl +openmp_blas +int64_blas')

    depends_on('veclibfort', when='blas=accelerate')
    conflicts('blas=accelerate +openmp_blas')

    depends_on('essl -cuda', when='blas=essl -openmp_blas ~int64_blas')
    depends_on('essl -cuda +ilp64', when='blas=essl -openmp_blas +int64_blas')
    depends_on('essl threads=openmp', when='blas=essl +openmp_blas ~int64_blas')
    depends_on('essl threads=openmp +ilp64', when='blas=essl +openmp_blas +int64_blas')
    depends_on('netlib-lapack +external-blas', when='blas=essl')

    depends_on('aluminum', when='+al ~cuda')
    depends_on('aluminum +gpu +mpi_cuda', when='+al +cuda')

    # Note that this forces us to use OpenBLAS until #1712 is fixed
    depends_on('lapack', when='blas=openblas ~openmp_blas')

    depends_on('mpi')

    depends_on('scalapack', when='+scalapack')
    depends_on('gmp', when='+mpfr')
    depends_on('mpc', when='+mpfr')
    depends_on('mpfr', when='+mpfr')

    depends_on('cuda', when='+cuda')
    depends_on('cub', when='+cuda')

    conflicts('@0:0.98', msg="Hydrogen did not exist before v0.99. " +
              "Did you mean to use Elemental instead?")

    generator = 'Ninja'
    depends_on('ninja', type='build')

    @property
    def libs(self):
        shared = True if '+shared' in self.spec else False
        return find_libraries(
            'libEl', root=self.prefix, shared=shared, recursive=True
        )

    def cmake_args(self):
        spec = self.spec

        args = [
            '-DCMAKE_INSTALL_MESSAGE:STRING=LAZY',
            '-DCMAKE_C_COMPILER=%s' % spec['mpi'].mpicc,
            '-DCMAKE_CXX_COMPILER=%s' % spec['mpi'].mpicxx,
            '-DCMAKE_Fortran_COMPILER=%s' % spec['mpi'].mpifc,
            '-DBUILD_SHARED_LIBS:BOOL=%s'      % ('+shared' in spec),
            '-DHydrogen_ENABLE_OPENMP:BOOL=%s'       % ('+hybrid' in spec),
            '-DHydrogen_ENABLE_QUADMATH:BOOL=%s'     % ('+quad' in spec),
            '-DHydrogen_USE_64BIT_INTS:BOOL=%s'      % ('+int64' in spec),
            '-DHydrogen_USE_64BIT_BLAS_INTS:BOOL=%s' % ('+int64_blas' in spec),
            '-DHydrogen_ENABLE_MPC:BOOL=%s'        % ('+mpfr' in spec),
            '-DHydrogen_GENERAL_LAPACK_FALLBACK=ON',
            '-DHydrogen_ENABLE_ALUMINUM=%s' % ('+al' in spec),
            '-DHydrogen_ENABLE_CUB=%s' % ('+cuda' in spec),
            '-DHydrogen_ENABLE_CUDA=%s' % ('+cuda' in spec),
            '-DHydrogen_ENABLE_TESTING=%s' % ('+test' in spec),
        ]

        # Add support for OS X to find OpenMP
        if (self.spec.satisfies('%clang')):
            if (sys.platform == 'darwin'):
                clang = self.compiler.cc
                clang_bin = os.path.dirname(clang)
                clang_root = os.path.dirname(clang_bin)
                args.extend([
                    '-DOpenMP_DIR={0}'.format(clang_root)])

        if 'blas=openblas' in spec:
            args.extend([
                '-DHydrogen_USE_OpenBLAS:BOOL=%s' % ('blas=openblas' in spec),
                '-DOpenBLAS_DIR:STRING={0}'.format(
                    spec['openblas'].prefix)])
        elif 'blas=mkl' in spec:
            args.extend([
                '-DHydrogen_USE_MKL:BOOL=%s' % ('blas=mkl' in spec)])
        elif 'blas=accelerate' in spec:
            args.extend(['-DHydrogen_USE_ACCELERATE:BOOL=TRUE'])
        elif 'blas=essl' in spec:
            args.extend([
                '-DHydrogen_USE_ESSL:BOOL=%s' % ('blas=essl' in spec)])

        if '+omp_taskloops' in spec:
            args.extend([
                '-DHydrogen_ENABLE_OMP_TASKLOOP:BOOL=%s' %
                ('+omp_taskloops' in spec)])

        if '+al' in spec:
            args.extend([
                '-DHydrogen_ENABLE_ALUMINUM:BOOL=%s' % ('+al' in spec),
                '-DALUMINUM_DIR={0}'.format(
                    spec['aluminum'].prefix)])

        return args
