#!@PYTHON@
# This file is part of GNUnet
# (C) 2019 GNUnet e.V.
#
# Authors:
# Author: ng0 <ng0@taler.net>
#
# Permission to use, copy, modify, and/or distribute this software for any
# purpose with or without fee is hereby granted.
#
# THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
# WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
# MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE
# LIABLE FOR ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES
# OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS,
# WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION,
# ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF
# THIS SOFTWARE.
#
# SPDX-License-Identifier: 0BSD

import os
from distutils.spawn import find_executable


def existence(name):
    return find_executable(name) is not None


# GNUNET_TMP which we suggest to use in place of the absolute definition of
# /tmp.  So instead of /tmp/foo you would write $GNUNET_TMP/foo.  The usage
# of $GNUNET_TMP/foo, will result in $TMPDIR/gnunet/foo, or $TMP/gnunet/foo
# and finally, if TMPDIR is undefined, /tmp/gnunet/foo.
# 'TEMP' is not (yet) covered by GNUNET_TMP.
# TODO: merge these two functions?
def gnunet_tmp_path():
    if os.environ.get('GNUNET_TMP'):
        return os.environ.get('GNUNET_TMP')
    elif os.environ.get('TMPDIR'):
        return os.environ.get('TMPDIR') + '/gnunet'
    elif os.environ.get('TMP'):
        return os.environ.get('TMP') + '/gnunet'
    elif os.environ.get('TEMP'):
        return os.environ.get('TEMP') + '/gnunet'
    else:
        return '/tmp/gnunet'


def tmp_path():
    if os.environ.get('TMPDIR'):
        return os.environ.get('TMPDIR')
    elif os.environ.get('TMP'):
        return os.environ.get('TMP')
    elif os.environ.get('TEMP'):
        return os.environ.get('TEMP')
    else:
        return '/tmp'


def get_path(name):
    dpath = {
        'exec_prefix': '@exec_prefix@',
        'libexecdir': '@libexecdir@',
        'gnunet_prefix': os.environ.get('GNUNET_PREFIX', None),
        'tmp': tmp_path(),
        'gnunet_tmp': gnunet_tmp_path()
    }
    try:
        return dpath[name]
    except KeyError:
        return []


def suffix_executable(name):
    if os.name == 'posix':
        return string(name)
    if os.name == 'nt':
        return string(name + '.exe')