import zope.interface
import zope.component
from zope.component.factory import Factory
from zope.size.interfaces import ISized
from zope.i18nmessageid import MessageFactory
_ = MessageFactory('sfive')

try:
    from OFS.SimpleItem import SimpleItem
except ImportError:
    from persistent import Persistent as SimpleItem

from sfive.interfaces import IPresentation

class Presentation(SimpleItem):
    zope.interface.implements(IPresentation)

    title = u''
    presenter = u''
    affiliation = u''
    location = u''
    text = u''

PresentationFactory = Factory(Presentation)

class PresentationSize(object):
    """Size adapter for `Presentation`.

    Size for sorting:

    >>> presentation = Presentation()
    >>> presentation.text = u'Bla bla bla'
    >>> size = PresentationSize(presentation)
    >>> size.sizeForSorting()
    ('byte', 11)

    Size for display:

    >>> from zope.app.tests.placelesssetup import setUp, tearDown
    >>> from zope.i18n import translate
    >>> setUp()
    >>> translate(size.sizeForDisplay())
    u'11 characters'
    >>> tearDown()
    """
    zope.interface.implements(ISized)
    zope.component.adapts(IPresentation)

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

    def sizeForSorting(self):
        return ('byte', len(self.context.text))

    def sizeForDisplay(self):
        unit, chars = self.sizeForSorting()
        return _('${chars} characters', mapping={'chars': chars})