##
## container.py
## Login : <uli@pu.smp.net>
## Started on  Tue Jun  7 12:02:19 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
##
"""
Components for storing site images (passport photographs, etc.)
"""
import grok
from waeup.sirp.interfaces import IWAeUPSIRPPluggable, IImagesContainer

class ImagesContainer(grok.Container):
    grok.implements(IImagesContainer)


class ImagesContainerPlugin(grok.GlobalUtility):
    """A WAeUPSIRPPlugin that creates an images container in portal.

    This plugin should be called by a typical
    `waeup.sirp.app.Universtiy` instance on creation time. The
    :meth:`update` method normally can also be triggered manually over
    the main site configuration.

    Implements :class:`waeup.sirp.interfaces.IWAeUPSIRPPluggable`
    """
    grok.name('images')
    grok.implements(IWAeUPSIRPPluggable)
    log_prefix = 'ImagesPlugin'

    def setup(self, site, name, logger):
        """Create a new :class:`ImagesContainer` instance in `site`.
        """
        site['images'] = ImagesContainer()
        logger.info(
            '%s: Installed images container.' % (self.log_prefix,)
            )
        return

    def update(self, site, name, logger):
        """Update site wide ``images`` container.

        If the site already contains a suitable ``images`` container,
        leave it that way. If not create one and delete the old one if
        appropriate.
        """
        images_folder = site.get('images', None)
        site_name = getattr(site, '__name__', '<Unnamed Site>')
        if IImagesContainer.providedBy(images_folder):
            # Applicants up to date. Return.
            logger.info(
                '%s: Updating site at %s: Nothing to do.' % (
                    self.log_prefix, site_name,)
                )
            return
        elif images_folder is not None:
            # Images need update. Remove old instance.
            logger.warn(
                '%s: Outdated images folder detected at site %s.'
                'Removing it.' % (self.log_prefix, site_name)
                    )
            del site['images']
        # Add new images container.
        logger.info(
            '%s: Updating site at %s. Installing '
            'images container.' % (self.log_prefix, site_name,)
            )
        self.setup(site, name, logger)
        return