#!/usr/bin/env python3


# SAT: a jabber client
# Copyright (C) 2009-2021 Jérôme Poisson (goffi@goffi.org)

# This program is free software: you can redistribute it and/or modify
# it under the terms of the GNU Affero General Public License as published by
# the Free Software Foundation, either version 3 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 Affero General Public License for more details.

# You should have received a copy of the GNU Affero General Public License
# along with this program.  If not, see <http://www.gnu.org/licenses/>.

from typing import Callable, cast

from libervia.backend.core.log import getLogger

log = getLogger(__name__)

try:

    import gettext

    _ = gettext.translation("libervia_backend", "i18n", fallback=True).gettext
    _translators = {None: gettext.NullTranslations()}

    def language_switch(lang=None):
        if not lang in _translators:
            _translators[lang] = gettext.translation(
                "libervia_backendt", languages=[lang], fallback=True
            )
        _translators[lang].install()


except ImportError:

    log.warning("gettext support disabled")
    _ = cast(Callable[[str], str], lambda msg: msg)  # Libervia doesn't support gettext

    def language_switch(lang=None):
        pass


D_ = cast(Callable[[str], str], lambda msg: msg)  # used for deferred translations