# Captcha/ReCaptcha validators. We override the standard validators from
# plone.formwidget.captcha and plone.formwidget.recaptcha, in order to
# switch between the two. This is necessary, because the zcml registration
# of the CaptchaValidator has to be there, no matter which captcha solution
# is installed, or even when no captcha solution is installed.

from Acquisition import aq_inner

from z3c.form import validator

from z3c.form.interfaces import IValidator

from zope.component import getMultiAdapter, provideAdapter, queryUtility

from zope.schema import ValidationError

from plone.registry.interfaces import IRegistry

from plone.app.discussion.interfaces import IDiscussionSettings

from plone.formwidget.captcha import CaptchaMessageFactory as _

class WrongCaptchaCode(ValidationError):
    __doc__ = _("""The code you entered was wrong, please enter the new one.""")

class CaptchaValidator(validator.SimpleFieldValidator):

    def validate(self, value):
        super(CaptchaValidator, self).validate(value)

        registry = queryUtility(IRegistry)
        settings = registry.forInterface(IDiscussionSettings)

        if settings.captcha == 'captcha':
            # Fetch captcha view
            captcha = getMultiAdapter((aq_inner(self.context), self.request), name='captcha')
            if value:
                if not captcha.verify(value):
                    raise WrongCaptchaCode
                else:
                    return True
            raise WrongCaptchaCode
        elif settings.captcha == 'recaptcha':
            # Fetch recatpcha view
            captcha = getMultiAdapter((aq_inner(self.context), self.request), name='recaptcha')
            if not captcha.verify():
                raise WrongCaptchaCode
            else:
                return True