#!/usr/bin/python
# -*- coding: utf-8 -*-
# \file Output.py
# \brief TODO
# \author Florent Guiotte <florent.guiotte@gmail.com>
# \version 0.1
# \date 03 avril 2018
#
# TODO details

#from . import Node, Input
from .Node import Node
from .Input import Input

class Output(Node):
    def __init__(self, name='__CHILD__'):
        super().__init__('O:{}'.format(name))
        self.__dict__['input'] = None

    def __setattr__(self, name, value):
        if name == 'input':
            self._input(value)
        else:
            self.__dict__[name] = value

    def _input(self, inode):
        if not isinstance(inode, (Input)) and inode is not None:
            raise NotImplementedError('{} is not an Input'.format(inode))
        
        if self.__dict__['input'] is not None:
            self.__dict__['input'].unregister(self)
            
        self.__dict__['input'] = inode
        
        if inode is not None:
            inode.register(self)

    def _run(self):
        if self.input is None:
            raise RuntimeError('{} do not have an input'.format(self))
        return self.input.run()