# coding=utf-8
#
# Copyright (C) 2010 Nick Drobchenko, nick@cnc-club.ru
# Copyright (C) 2005 Aaron Spike, aaron@ekips.org
#
# This program 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.
#
# This program 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, write to the Free Software
# Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA.
#
"""
Allow extensions to translate messages.
"""

import gettext
import os

# Get gettext domain and matching locale directory for translation of extensions strings
# (both environment variables are set by Inkscape)
GETTEXT_DOMAIN = os.environ.get('INKEX_GETTEXT_DOMAIN')
GETTEXT_DIRECTORY = os.environ.get('INKEX_GETTEXT_DIRECTORY')

# INKSCAPE_LOCALEDIR can be used to override the default locale directory Inkscape uses
INKSCAPE_LOCALEDIR = os.environ.get('INKSCAPE_LOCALEDIR')

def localize(domain=GETTEXT_DOMAIN, localedir=GETTEXT_DIRECTORY):
    """Configure gettext and install _() function into builtins namespace for easy access"""

    # Do not enable translation if GETTEXT_DOMAIN is unset.
    # This is the case when translationdomain="none", but also when no catalog was found.
    # Install a NullTranslation just to be sure (so we do not get errors about undefined '_')
    if domain is None:
        gettext.NullTranslations().install()
        return

    # Use the default system locale by default,
    # but prefer LANGUAGE environment variable (which is set by Inkscape according to UI language)
    languages = None

    trans = gettext.translation(domain, localedir, languages, fallback=True)
    trans.install()



def inkex_localize():
    """
    Return internal Translations instance for translation of the inkex module itself
    Those will always use the 'inkscape' domain and attempt to lookup the same catalog Inkscape uses
    """

    domain = 'inkscape'
    localedir = INKSCAPE_LOCALEDIR
    languages = None

    return gettext.translation(domain, localedir, languages, fallback=True)

inkex_gettext = inkex_localize().gettext  # pylint: disable=invalid-name