# -*- coding: utf-8 -*-

# Copyright (C) 2006-2011 CS-SI

# License: GNU GPL v2 <http://www.gnu.org/licenses/gpl-2.0.html>

"""

Validateur et convertisseur de dates selon un format.

"""

from formencode.api import FancyValidator, Invalid

from datetime import datetime

from pylons.i18n import ugettext as _, lazy_ugettext as l_

class DateFormatConverter(FancyValidator):

    """

    Valide une date selon un format identique à ceux

    acceptés par la fonction strptime().

    """

    messages = {

        'invalid': 'Invalid value',

    }

    def _to_python(self, value, state):

        if not isinstance(value, basestring):

            raise Invalid(self.message('invalid', state), value, state)

        str_date = value.lower()

        if isinstance(str_date, unicode):

            str_date = str_date.encode('utf-8')

        try:

            # TRANSLATORS: Format de date et heure Python/JavaScript.

            # TRANSLATORS: http://www.dynarch.com/static/jscalendar-1.0/doc/html/reference.html#node_sec_5.3.5

            # TRANSLATORS: http://docs.python.org/release/2.5/lib/module-time.html

            date = datetime.strptime(str_date, _('%Y-%m-%d %I:%M:%S %p').encode('utf8'))

        except ValueError, e:

            raise Invalid(self.message('invalid', state), value, state)

        return date

    def _from_python(self, value, state):

        if not isinstance(value, datetime):

            raise Invalid(self.message('invalid', state), value, state)

        # Même format que pour _to_python.

        return datetime.strftime(

                    value,

                    _('%Y-%m-%d %I:%M:%S %p').encode('utf8')

                ).decode('utf-8')