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from peak.util.proxies import ObjectWrapper

from ..design_patterns.visitor import AtkVisitable


__all__ = ["set_tree_element_attr", "AtkTreeElement"]

def set_tree_element_attr(tree_element, attr, value):
    object.__setattr__(tree_element, attr, value)


# TODO ajouter parent/ancestor
# @composite(AtkTreeLeaf, AtkTreeNode)
class AtkTreeElement(ObjectWrapper, AtkVisitable):
    tag = ""

    def __init__(self, value=None):
        # TODO c'est une bonne idee ca ? pour eviter elem.attr = truc <=>elem.value.attr avec value a None
        if value is None:
            class Container(object):
                pass
            value = Container()

        # TODO parent
        ObjectWrapper.__init__(self, value)
        object.__setattr__(self, "_parent", None)


    # def __getattribute__(self, name):
    #     result = None

    #     try:
    #         result = object.__getattribute__(self, name)
    #     except AttributeError:
    #         result = ObjectWrapper.__getattr__(self, name)
            
    #     return result



    def get_node(self, value):
        result = None
        found = False

        if (value is self) or (value is self.value):
            result = self
            found = True
        else:
            try:
                for child in self.children:
                    try:
                        result = child.get_node(value)
                        found = True
                    except ValueError:
                        pass
            # Case where value is not a tree element
            except AttributeError:
                raise ValueError

        if not found:
            # TODO definir une exception
            raise ValueError

        return result

        
    @property
    def value(self):
        return self.__subject__

    
    # tODO a test    
    @value.setter
    def value(self, value):
        ObjectWrapper.__init__(self, value)

        
    @property
    def parent(self):
        return self._parent

        
    @property
    def ancestors(self):
        result = []
        
        if self._parent is not None:
            result.append(self._parent)
            result += self._parent.ancestors
        
        return result
