from babel import support
from flask import current_app, request
from wtforms.i18n import messages_path

try:
    from flask_babel import get_locale
except ImportError:
    from flask_babelex import get_locale

__all__ = ('Translations', 'translations')


def _get_translations():
    """Returns the correct gettext translations.
    Copy from flask-babel with some modifications.
    """

    if not request:
        return None

    # babel should be in extensions for get_locale
    if 'babel' not in current_app.extensions:
        return None

    translations = getattr(request, 'wtforms_translations', None)

    if translations is None:
        translations = support.Translations.load(
            messages_path(), [get_locale()], domain='wtforms'
        )
        request.wtforms_translations = translations

    return translations


class Translations(object):
    def gettext(self, string):
        t = _get_translations()
        return string if t is None else t.ugettext(string)

    def ngettext(self, singular, plural, n):
        t = _get_translations()

        if t is None:
            return singular if n == 1 else plural

        return t.ungettext(singular, plural, n)


translations = Translations()