# 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 re
import os
from itertools import product
from spack.util.executable import which

# Supported archive extensions.
PRE_EXTS = ["tar", "TAR"]
EXTS     = ["gz", "bz2", "xz", "Z", "zip", "tgz"]

# Add PRE_EXTS and EXTS last so that .tar.gz is matched *before* .tar or .gz
ALLOWED_ARCHIVE_TYPES = [".".join(l) for l in product(
    PRE_EXTS, EXTS)] + PRE_EXTS + EXTS


def allowed_archive(path):
    return any(path.endswith(t) for t in ALLOWED_ARCHIVE_TYPES)


def decompressor_for(path, extension=None):
    """Get the appropriate decompressor for a path."""
    if ((extension and re.match(r'\.?zip$', extension)) or
            path.endswith('.zip')):
        unzip = which('unzip', required=True)
        unzip.add_default_arg('-q')
        return unzip
    if extension and re.match(r'gz', extension):
        gunzip = which('gunzip', required=True)
        return gunzip
    tar = which('tar', required=True)
    tar.add_default_arg('-xf')
    return tar


def strip_extension(path):
    """Get the part of a path that does not include its compressed
       type extension."""
    for type in ALLOWED_ARCHIVE_TYPES:
        suffix = r'\.%s$' % type
        if re.search(suffix, path):
            return re.sub(suffix, "", path)
    return path


def extension(path):
    """Get the archive extension for a path."""
    if path is None:
        raise ValueError("Can't call extension() on None")

    # Strip sourceforge suffix.
    if re.search(r'((?:sourceforge.net|sf.net)/.*)/download$', path):
        path = os.path.dirname(path)

    for t in ALLOWED_ARCHIVE_TYPES:
        suffix = r'\.%s$' % t
        if re.search(suffix, path):
            return t
    return None
