##
## datewidget.py
## Login : <uli@pu.smp.net>
## Started on  Wed May 11 15:53:35 2011 Uli Fouquet
## $Id$
## 
## Copyright (C) 2011 Uli Fouquet
## 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., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
##
"""
A datewidget with customizable date format.
"""
from datetime import datetime
from zope.formlib.i18n import _
from zope.formlib.interfaces import ConversionError
from zope.formlib.textwidgets import DateWidget, DateDisplayWidget, escape
from zope.formlib.widget import renderElement

class FormattedDateWidget(DateWidget):
    """A date widget that supports different (and _explicit_) date formats.

    This is an input widget.
    """
    date_format = '%Y-%m-%d'

    def _toFieldValue(self, input):
        if input == self._missing:
            return self.context.missing_value
        else:
            try:
                value = datetime.strptime(input, self.date_format)
            except (ValueError, IndexError), v:
                raise ConversionError(_("Invalid datetime data"), v)
        return value.date()

    def _toFormValue(self, value):
        if value:
            value = value.strftime(self.date_format)
        return value

class FormattedDateDisplayWidget(DateDisplayWidget):
    """A date widget that supports different (and _explicit_) date formats.

    This is a display widget.
    """
    date_format = '%Y-%m-%d'

    def __call__(self):
        if self._renderedValueSet():
            content = self._data
        else:
            content = self.context.default
        if content == self.context.missing_value:
            return ""
        content = content.strftime(self.date_format)
        return renderElement("span", contents=escape(content),
                             cssClass=self.cssClass)