import protocols
from interfaces import *
import validators

class Controller(object):

    #protocols.advise(
    #    instancesImplement=[IController])

    def __init__(self, obj, immutable=False):
        self.obj = obj
        self.immutable = immutable
        self.validator = validators.adaptValidator(self.obj)
        self.attrNames = self.validator.fields.keys()

    def attributes(self):
        result = {}
        for name in self.attrNames():
            value = getattr(self.obj, name)
            try:
                controller = protocols.adapt(value, IController)
            except NotImplementedError:
                pass
            else:
                value = controller.attributes()
            result[name] = value
        return result

    def copyWithAttributes(self, attrs):
        return self.obj.__class__(**attrs)

    def setAttributes(self, attrs):
        for name, value in attrs:
            assert name in self.attrNames, "The attribute %r is not expected" % name
            value = getattr(self.obj, name)
            try:
                controller = protocols.adapt(value, IController)
            except NotImplementedError:
                setattr(self.obj, name, value)
            else:
                setattr(self.obj, name, controller.copyWithAttributes(value))