# 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
import platform


class Texlive(Package):
    """TeX Live is a free software distribution for the TeX typesetting
       system.  Heads up, it's is not a reproducible installation."""

    homepage = "http://www.tug.org/texlive"

    # Install from specific site because the texlive mirrors do not
    # all update in synchrony.
    #
    # BEWARE: TexLive updates their installs frequently (probably why
    # they call it *Live*...).  There is no good way to provide a
    # repeatable install of the package.
    #
    # We're now pulling the installation bits from tug.org's repo of
    # historic bits.  This means that the checksum for the installer
    # itself is stable.  Don't let that fool you though, it's still
    # installing TeX **LIVE** from e.g. ctan.math.... below, which is
    # not reproducible.
    version('live', '946701aa28ca1f93e55e8310ce63fbf8',
            url='ftp://tug.org/historic/systems/texlive/2018/install-tl-unx.tar.gz')

    # There does not seem to be a complete list of schemes.
    # Examples include:
    #   full scheme (everything)
    #   medium scheme (small + more packages and languages)
    #   small scheme (basic + xetex, metapost, a few languages)
    #   basic scheme (plain and latex)
    #   minimal scheme (plain only)
    # See:
    # https://www.tug.org/texlive/doc/texlive-en/texlive-en.html#x1-25025r6
    variant(
        'scheme',
        default='small',
        values=('minimal', 'basic', 'small', 'medium', 'full'),
        description='Package subset to install'
    )

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

    def setup_environment(self, spack_env, run_env):
        suffix = "%s-%s" % (platform.machine(), platform.system().lower())
        run_env.prepend_path('PATH', join_path(self.prefix.bin, suffix))

    def install(self, spec, prefix):
        # Using texlive's mirror system leads to mysterious problems,
        # in lieu of being able to specify a repository as a variant, hardwire
        # a particular (slow, but central) one for now.
        _repository = 'http://ctan.math.washington.edu/tex-archive/systems/texlive/tlnet/'
        env = os.environ
        env['TEXLIVE_INSTALL_PREFIX'] = prefix
        perl = which('perl')
        scheme = spec.variants['scheme'].value
        perl('./install-tl', '-scheme', scheme,
             '-repository', _repository,
             '-portable', '-profile', '/dev/null')
