# Copyright 2013-2021 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 inspect
import os

from spack import *


class Lorene(MakefilePackage):
    """LORENE: Langage Objet pour la RElativite NumeriquE

    LORENE is a set of C++ classes to solve various problems
    arising in numerical relativity, and more generally in
    computational astrophysics. It provides tools to solve
    partial differential equations by means of multi-domain
    spectral methods."""

    homepage = "https://lorene.obspm.fr/index.html"
    cvs      = ":pserver:anonymous:anonymous@octane.obspm.fr:/cvsroot%module=Lorene"

    maintainers = ['eschnett']

    version('2021.4.22', date='2021-04-22')

    variant('fftw', default=True,
            description='Use external FFTW for spectral transformations')
    variant('bin_star', default=True,
            description='Build Bin_star solver for binary neutron star systems')

    depends_on('blas')
    depends_on('fftw @3:', when='+fftw')
    depends_on('gsl')
    depends_on('lapack')
    depends_on('pgplot')

    parallel = False

    def edit(self, spec, prefix):
        blas_libs = spec['blas'].libs.link_flags
        fftw_incdirs = "-I" + spec['fftw'].prefix.include if '+fftw' in spec else ""
        fftw_libdirs = "-L" + spec['fftw'].prefix.lib if '+fftw' in spec else ""
        fftw_libs = spec['fftw'].libs.link_flags
        gsl_incdirs = "-I" + spec['gsl'].prefix.include
        gsl_libdirs = "-L" + spec['gsl'].prefix.lib
        gsl_libs = spec['gsl'].libs.link_flags
        lapack_libs = spec['lapack'].libs.link_flags
        pgplot_incdirs = "-I" + spec['pgplot'].prefix.include
        pgplot_libdirs = "-L" + spec['pgplot'].prefix.lib
        pgplot_libs = spec['pgplot'].libs.link_flags

        substitutions = [
            ('@CXX@', self.compiler.cxx),
            ('@CXXFLAGS@', "-g -I$(HOME_LORENE)/C++/Include -O3 -DNDEBUG"),
            ('@CXXFLAGS_G@', "-g -I$(HOME_LORENE)/C++/Include"),
            ('@F77@', self.compiler.f77),
            ('@F77FLAGS@', "-ffixed-line-length-none -g -O3"),
            ('@F77FLAGS_G@', "-ffixed-line-length-none -g"),
            ('@INC@',
             ("-I$(HOME_LORENE)/C++/Include " +
              "-I$(HOME_LORENE)/C++/Include_extra " +
              fftw_incdirs + " " + gsl_incdirs + " " + pgplot_incdirs)),
            ('@RANLIB@', "ls"),
            ('@MAKEDEPEND@', ": >$(df).d"),
            ('@FFT_DIR@', "FFTW3"),
            ('@LIB_CXX@', fftw_libdirs + " " + fftw_libs + " -lgfortran"),
            ('@LIB_GSL@', gsl_libdirs + " " + gsl_libs),
            ('@LIB_LAPACK@', lapack_libs + " " + blas_libs),
            ('@LIB_PGPLOT@', pgplot_libdirs + " " + pgplot_libs),
        ]
        local_settings_template = join_path(
            os.path.dirname(inspect.getmodule(self).__file__),
            'local_settings.template'
        )
        local_settings = join_path(
            self.stage.source_path, 'local_settings'
        )
        copy(local_settings_template, local_settings)
        for key, value in substitutions:
            filter_file(key, value, local_settings)

    def build(self, spec, prefix):
        args = ['HOME_LORENE=' + self.build_directory]
        # (We could build the documentation as well.)
        # (We could circumvent the build system and simply compile all
        # source files, and do so in parallel.)
        make('cpp', 'fortran', 'export', *args)
        if '+bin_star' in spec:
            with working_dir(join_path('Codes', 'Bin_star')):
                make('-f', 'Makefile_O2',
                     'coal', 'lit_bin', 'init_bin', 'coal_regu', 'init_bin_regu',
                     'analyse', 'prepare_seq',
                     *args)

    def install(self, spec, prefix):
        mkdirp(prefix.lib)
        install_tree('Lib', prefix.lib)
        mkdirp(prefix.bin)
        if '+bin_star' in spec:
            for exe in ['coal', 'lit_bin', 'init_bin', 'coal_regu',
                        'init_bin_regu', 'analyse', 'prepare_seq']:
                install(join_path('Codes', 'Bin_star', exe), prefix.bin)

    @property
    def libs(self):
        shared = "+shared" in self.spec
        return find_libraries(
            "liblorene*", root=self.prefix, shared=shared, recursive=True
        )