import json


class State(object):
    IGNORE = frozenset(['Coude', 'Noeud', 'P24', 'P0', 'Pulse'])
    # these components do not have any states (value/ true or flase...)

    Breakpoints = ['Relais']
    #possibility to add other breakpoints in the future ;) 
 
    def __init__(self, cocosim_server):
        self.cocosim_server = cocosim_server
        self.conf = self.cocosim_server.conf["ui"]
        self.composants = {}
        self._exception = None

    def load_conf(self, schema_d):
        # Chargement des blocs
        for nom, valeur in schema_d['blocs'].items():
            if valeur['type'] not in self.IGNORE:
                self.composants[nom] = None

    def to_json(self):
        if self._exception:
            return json.dumps({'exn': self._exception})
        else:
            return json.dumps(self.composants)

    def __iter__(self):
        return self.conf.__iter__

    def items(self):
        return self.composants.items()

    def keys(self):
        return self.composants.keys()

    def update(self, nom, valeur):
        self.composants[nom] = valeur

    def exception(self, e):
        self._exception = e

    def reset_exception(self):
        self._exception = None