# -*- coding: utf-8 -*-
from plone.app.imaging.utils import getAllowedSizes
from zope.i18nmessageid import MessageFactory
from zope.interface import provider
from zope.schema.interfaces import IVocabularyFactory
from zope.schema.vocabulary import SimpleTerm
from zope.schema.vocabulary import SimpleVocabulary

_ = MessageFactory('plone')


@provider(IVocabularyFactory)
def ScalesVocabulary(context):
    """Obtains available scales from plone.app.imaging
    """
    terms = []
    for scale, (width, height) in getAllowedSizes().iteritems():
        translated = _(
            'imagescale_{0:s}'.format(scale),
            default='{0:s} ${{width}}x${{height}}'.format(scale),
            mapping={'width': str(width), 'height': str(height)})
        terms.append(SimpleTerm(scale, scale, translated))

    return SimpleVocabulary(terms)