# $Id$

from zope.interface import implements
from zope.component import adapts
from zope.app.container.btree import BTreeContainer
from zope.app.container.interfaces import INameChooser

from zblog.interfaces import IBlog
import re
from datetime import datetime

class Blog(BTreeContainer):
    """Blog implementation using BTree container.

    Make sure that Blog implements IBlog interface:

    >>> from zope.interface.verify import verifyClass
    >>> verifyClass(IBlog, Blog)
    True

    Example of changing blog title and description:

    >>> blog = Blog()

    >>> blog.title
    u''
    >>> blog.title = u'Blog title'
    >>> blog.title
    u'Blog title'

    >>> blog.description
    u''
    >>> blog.description = u'Blog description'
    >>> blog.description
    u'Blog description'
    """

    implements(IBlog)

    # See zblog.interfaces.IBlog
    description = u''

    # See zblog.interfaces.IBlog
    title = u''


class BlogNameChooser:
    """An adapter to choose names for blog entries."""
    implements(INameChooser)
    adapts(IBlog)

    def __init__(self, context):
        self.context = context

    def chooseName(self, name, entry):
        if name:
            return name
        return datetime.now().strftime('%Y_%m_%d_') + \
               re.sub('\s', '_', entry.title)

    def checkName(self, name, entry):
        return True