##############################################################################
#
# Copyright (c) 2007 Zope Foundation and Contributors.
# All Rights Reserved.
#
# This software is subject to the provisions of the Zope Public License,
# Version 2.1 (ZPL).  A copy of the ZPL should accompany this distribution.
# THIS SOFTWARE IS PROVIDED "AS IS" AND ANY AND ALL EXPRESS OR IMPLIED
# WARRANTIES ARE DISCLAIMED, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
# WARRANTIES OF TITLE, MERCHANTABILITY, AGAINST INFRINGEMENT, AND FITNESS
# FOR A PARTICULAR PURPOSE.
#
##############################################################################
"""Text Widget Implementation

$Id$
"""
__docformat__ = "reStructuredText"

import zope.component
import zope.interface
import zope.schema
import zope.schema.interfaces
from zope.i18n import translate
from zope.schema.vocabulary import SimpleTerm
from zope.pagetemplate.interfaces import IPageTemplate

from z3c.form import interfaces, util
from z3c.form.widget import SequenceWidget, FieldWidget
from z3c.form.browser import widget


@zope.interface.implementer_only(interfaces.IRadioWidget)
class RadioWidget(widget.HTMLInputWidget, SequenceWidget):
    """Input type radio widget implementation."""

    klass = u'radio-widget'
    css = u'radio'

    def isChecked(self, term):
        return term.token in self.value

    def renderForValue(self, value):
        terms = list(self.terms)
        try:
            term = self.terms.getTermByToken(value)
        except LookupError:
            if value == SequenceWidget.noValueToken:
                term = SimpleTerm(value)
                terms.insert(0, term)
            else:
                raise
        checked = self.isChecked(term)
        id = '%s-%i' % (self.id, terms.index(term))
        item = {'id': id, 'name': self.name, 'value': term.token,
                'checked': checked}
        template = zope.component.getMultiAdapter(
            (self.context, self.request, self.form, self.field, self),
            IPageTemplate, name=self.mode + '_single')
        return template(self, item)

    @property
    def items(self):
        if self.terms is None:
            return
        for count, term in enumerate(self.terms):
            checked = self.isChecked(term)
            id = '%s-%i' % (self.id, count)
            if zope.schema.interfaces.ITitledTokenizedTerm.providedBy(term):
                label = translate(term.title, context=self.request,
                                  default=term.title)
            else:
                label = util.toUnicode(term.value)
            yield {'id': id, 'name': self.name, 'value': term.token,
                   'label': label, 'checked': checked}

    def update(self):
        """See z3c.form.interfaces.IWidget."""
        super(RadioWidget, self).update()
        widget.addFieldClass(self)

    def json_data(self):
        data = super(RadioWidget, self).json_data()
        data['options'] = list(self.items)
        data['type'] = 'radio'
        return data


@zope.component.adapter(zope.schema.interfaces.IField, interfaces.IFormLayer)
@zope.interface.implementer(interfaces.IFieldWidget)
def RadioFieldWidget(field, request):
    """IFieldWidget factory for RadioWidget."""
    return FieldWidget(field, RadioWidget(request))