# 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 *


class Unuran(AutotoolsPackage):
    """Universal Non-Uniform Random number generator."""

    homepage = "http://statmath.wu.ac.at/unuran"
    url      = "http://statmath.wu.ac.at/unuran/unuran-1.8.1.tar.gz"

    version('1.8.1', sha256='c270ae96857857dbac6450043df865e0517f52856ddbe5202fd35583b13c5193')

    variant('shared', default=True,
            description="Enable the build of shared libraries")
    variant('rngstreams', default=True,
            description="Use RNGSTREAM library for uniform random generation")
    variant(
        'gsl', default=False,
        description="Use random number generators from GNU Scientific Library")

    depends_on('gsl',        when="+gsl")
    depends_on('rngstreams', when="+rngstreams")

    def configure_args(self):

        spec = self.spec

        args = [
            '--%s-shared' % ('enable' if '+shared' in spec else 'disable'),
            '--with-urgn-default=%s' % (
                'rngstream' if '+rngstreams' in spec else 'builtin'),
            '--%s-urng-gsl' % (
                'with' if '+gsl' in spec else 'without'),
            '--%s-urng-rngstreams' % (
                'with' if '+rngstreams' in spec else 'without')
        ]

        return args
