# -*- coding: utf-8 -*-
#
# Copyright 2008 Zuza Software Foundation
# Copyright 2014 F Wolff
#
# This file is part of translate.
#
# translate is free software; you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation; either version 2 of the License, or
# (at your option) any later version.
#
# translate is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with this program; if not, see <http://www.gnu.org/licenses/>.
#

__all__ = ('get_abs_data_filename', )

import os
import sys

import six


def upath(path):
    if six.PY2:
        return six.text_type(path, sys.getfilesystemencoding())
    return path


def get_abs_data_filename(path_parts, basedirs=None):
    """Get the absolute path to the given file- or directory name in the
    current running application's data directory.

    :type  path_parts: list
    :param path_parts: The path parts that can be joined by ``os.path.join()``.
    """
    if isinstance(path_parts, six.string_types):
        path_parts = [path_parts]

    DATA_DIRS = [
        ["..", "share"],
    ]

    BASE_DIRS = basedirs
    if not basedirs:
        # Useful for running from checkout or similar layout. This will find
        # Toolkit's data files
        base = os.path.dirname(upath(__file__))
        BASE_DIRS = [
            base,
            os.path.join(base, os.path.pardir),
        ]

    # Freedesktop standard
    if 'XDG_DATA_HOME' in os.environ:
        BASE_DIRS += [os.environ['XDG_DATA_HOME']]
    if 'XDG_DATA_DIRS' in os.environ:
        BASE_DIRS += os.environ['XDG_DATA_DIRS'].split(os.path.pathsep)

    # Mac OSX app bundles
    if 'RESOURCEPATH' in os.environ:
        BASE_DIRS += os.environ['RESOURCEPATH'].split(os.path.pathsep)

    if getattr(sys, 'frozen', False):
        # We know exactly what the layout is when we package for Windows, so
        # let's avoid unnecessary paths
        DATA_DIRS = [["share"]]
        BASE_DIRS = []

    BASE_DIRS += [
        # installed linux (/usr/bin) as well as Windows
        os.path.dirname(upath(sys.executable)),
    ]

    for basepath, data_dir in ((x, y) for x in BASE_DIRS for y in DATA_DIRS):
        dir_and_filename = data_dir + path_parts
        datafile = os.path.join(basepath or os.path.dirname(__file__),
                                *dir_and_filename)
        if os.path.exists(datafile):
            return datafile
    raise Exception('Could not find "%s"' % (os.path.join(*path_parts)))
