##
## phonewidget.py
## $Id$
##
"""A phone number widget.

This widget is an input widget (not made for display forms but for
edit and add forms).

It can be used for :class:`zope.schema.TextLine` fields but has to be
requested by the form manually (otherwise the regular TextLine widget
will be used for rendering).

The code was mainly taken from usphone implementation in z3c.widget
(which was designed for outdated zope.app.form (instead of
zope.formlib or newer form libs). Therefore some modifications were
neccessary and it might look a bit overloaded.
"""
import re
from waeup.sirp import MessageFactory as _
from zope import schema
from zope.browserpage import ViewPageTemplateFile
from zope.component import getMultiAdapter
from zope.formlib import form
from zope.formlib.interfaces import IBrowserWidget, IWidgetInputErrorView
from zope.formlib.interfaces import IInputWidget, WidgetInputError
from zope.formlib.widget import SimpleInputWidget
from zope.interface import Interface, implements

class IPhoneData(Interface):
    """A schema used to generate a Phone widget."""

    country = schema.TextLine(
        title=_('Country Code'),
        description=_('The country code of the phone number.'),
        min_length=1,
        constraint=re.compile(r'^[0-9]+$').search,
        required=True)

    area = schema.TextLine(
        title=_('Area Code'),
        description=_('The area code of the phone number.'),
        min_length=1,
        constraint=re.compile(r'^[0-9]+$').search,
        required=True)

    extension = schema.TextLine(
        title=_('Direct Line'),
        description=_('The direct line of the phone number.'),
        min_length=3,
        constraint=re.compile(r'^[0-9]{3,}$').search,
        required=True)


class PhoneWidgetData(object):
    """Phone number data"""
    implements(IPhoneData)

    country = None
    area = None
    extension = None

    def __init__(self, context, number=None):
        self.context = context
        if number is not None:
            # XXX: We have to provide something more tolerant
            self.country, self.area, self.extension = number.split('-')
            return
            try:
                self.country, self.area, self.extension = number.split('-')
            except ValueError:
                replacement = '1-1-%s' % (number.replace('-', ''),)
                self.country, self.area, self.extension = replacement.split(
                    '-', 2)

    @property
    def number(self):
        return u'-'.join((self.country, self.area, self.extension))


class PhoneWidget(SimpleInputWidget):
    """Phone Number Widget"""
    implements(IBrowserWidget, IInputWidget)

    template = ViewPageTemplateFile('phonewidget.pt')
    _prefix = 'field.'
    _error = None
    widgets = {}

    # See zope.formlib.interfaces.IWidget
    name = None
    visible = True

    def __init__(self, field, request):
        super(PhoneWidget, self).__init__(field, request)
        value = field.query(field.context)
        self._generateSubWidgets()
        return

    def _generateSubWidgets(self):
        """Create the three subwidgets.
        """
        value = self.context.query(self.context.context)
        adapters = {}
        adapters[IPhoneData] = PhoneWidgetData(self, value)
        self.widgets = form.setUpEditWidgets(
            form.FormFields(IPhoneData),
            self.name, value, self.request, adapters=adapters)
        self.widgets['country'].displayWidth = 3
        self.widgets['area'].displayWidth = 5
        self.widgets['extension'].displayWidth = 10
        return

    def setRenderedValue(self, value):
        """See zope.formlib.interfaces.IWidget"""
        if isinstance(value, unicode):
            country, area, extension = value.split('-')
            self.widgets['country'].setRenderedValue(country)
            self.widgets['area'].setRenderedValue(area)
            self.widgets['extension'].setRenderedValue(extension)


    def setPrefix(self, prefix):
        """See zope.formlib.interfaces.IWidget"""
        # Set the prefix locally
        if not prefix.endswith("."):
            prefix += '.'
        self._prefix = prefix
        self.name = prefix + self.context.__name__
        # Now distribute it to the sub-widgets
        self._generateSubWidgets()
        return

    def getInputValue(self):
        """See zope.formlib.interfaces.IInputWidget"""
        self._error = None
        try:
            return u'-'.join((
                self.widgets['country'].getInputValue(),
                self.widgets['area'].getInputValue(),
                self.widgets['extension'].getInputValue() ))
        except ValueError, v:
            self._error = WidgetInputError(
                self.context.__name__, self.label, _(v))
            raise self._error
        except WidgetInputError, e:
            self._error = e
            raise e

    def applyChanges(self, content):
        """See zope.formlib.interfaces.IInputWidget"""
        field = self.context
        new_value = self.getInputValue()
        old_value = field.query(content, self)
        # The selection has not changed
        if new_value == old_value:
            return False
        field.set(content, new_value)
        return True

    def hasInput(self):
        """See zope.formlib.interfaces.IInputWidget"""
        return (self.widgets['country'].hasInput() and
                (self.widgets['area'].hasInput() and
                 self.widgets['extension'].hasInput()))


    def hasValidInput(self):
        """See zope.formlib.interfaces.IInputWidget"""
        return (self.widgets['country'].hasValidInput() and
            self.widgets['area'].hasValidInput() and
            self.widgets['extension'].hasValidInput())


    def hidden(self):
        """See zope.formlib.interfaces.IBrowserWidget"""
        output = []
        output.append(self.widgets['country'].hidden())
        output.append(self.widgets['area'].hidden())
        output.append(self.widgets['extension'].hidden())
        return '\n'.join(output)


    def error(self):
        """See zope.formlib.interfaces.IBrowserWidget"""
        if self._error:
            return getMultiAdapter(
                (self._error, self.request),
                IWidgetInputErrorView).snippet()
        country_error = self.widgets['country'].error()
        if country_error:
            return country_error
        area_error = self.widgets['area'].error()
        if area_error:
            return area_error
        extension_error = self.widgets['extension'].error()
        if extension_error:
            return extension_error
        return ""

    def __call__(self):
        """See zope.formlib.interfaces.IBrowserWidget"""
        return self.template()