# 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 glob
import os
import sys


class Verrou(AutotoolsPackage):
    """A floating-point error checker.

    Verrou helps you look for floating-point round-off errors in programs. It
    implements a stochastic floating-point arithmetic based on random rounding:
    all floating-point operations are perturbed by randomly switching rounding
    modes. This can be seen as an asynchronous variant of the CESTAC method, or
    a subset of Monte Carlo Arithmetic, performing only output randomization
    through random rounding.
    """

    homepage = "https://github.com/edf-hpc/verrou"
    url      = "https://github.com/edf-hpc/verrou/archive/v2.0.0.tar.gz"
    git      = "https://github.com/edf-hpc/verrou.git"

    version('develop', branch='master')
    version('2.1.0', sha256='b1ba49f84aebab15b8ab5649946c9c31b53ad1499f6ffb681c98db41ed28566d')
    version('2.0.0', sha256='798df6e426ec57646a2a626d756b72f0171647ae5b07c982952dae2d71e26045')
    version('1.1.0', sha256='b5105f61c65680f31551199cd143b2e15f412c34c821537998a7165e315dde2d')

    resource(name='valgrind-3.14.0',
             url='https://sourceware.org/pub/valgrind/valgrind-3.14.0.tar.bz2',
             sha256='037c11bfefd477cc6e9ebe8f193bb237fe397f7ce791b4a4ce3fa1c6a520baa5',
             when='@2.1.0:')
    resource(name='valgrind-3.13.0',
             url='https://sourceware.org/pub/valgrind/valgrind-3.13.0.tar.bz2',
             sha256='d76680ef03f00cd5e970bbdcd4e57fb1f6df7d2e2c071635ef2be74790190c3b',
             when='@1.1.0:2.0.99')

    variant('fma', default=True,
            description='Activates fused multiply-add support for Verrou')

    depends_on('autoconf', type='build')
    depends_on('automake', type='build')
    depends_on('libtool', type='build')
    depends_on('m4', type='build')

    depends_on('python@:2.99.99', when='@1.1.0:2.0.99', type=('build', 'run'))
    depends_on('python@3.0:', when='@2.1.0:', type=('build', 'run'))
    extends('python')

    def patch(self):
        # We start with the verrou source tree and a "valgrind-x.y.z" subdir.
        # But we actually need a valgrind source tree with a "verrou" subdir.
        # First, let's locate the valgrind sources...
        valgrind_dirs = glob.glob('valgrind-*')
        assert len(valgrind_dirs) == 1
        valgrind_dir = valgrind_dirs[0]

        # ...then we can flip the directory organization around
        verrou_files = os.listdir('.')
        verrou_files.remove(valgrind_dir)
        os.mkdir('verrou')
        for name in verrou_files:
            os.rename(name, os.path.join('verrou', name))
        for name in os.listdir(valgrind_dir):
            os.rename(os.path.join(valgrind_dir, name), name)
        os.rmdir(valgrind_dir)

        # Once this is done, we can patch valgrind
        if self.spec.satisfies('@:2.0.99'):
            which('patch')('-p0', '--input=verrou/valgrind.diff')
        else:
            which('patch')('-p1', '--input=verrou/valgrind.diff')

        # Autogenerated perl path may be too long, need to fix this here
        # because these files are used during the build.
        for link_tool_in in glob.glob('coregrind/link_tool_exe_*.in'):
            filter_file('^#! @PERL@',
                        '#! /usr/bin/env perl',
                        link_tool_in)

    def autoreconf(self, spec, prefix):
        # Needed because we patched valgrind
        which("bash")("autogen.sh")

    def configure_args(self):
        spec = self.spec
        options = [
            '--enable-only64bit',
            '--{0}able-verrou-fma'.format('en' if '+fma' in spec else 'dis')
        ]

        if sys.platform == 'darwin':
            options.append('--build=amd64-darwin')

        return options
