initial_state = dict(
    instrument_list={},
    connection_list={},
)


class ActionTypes(object):
    UPDATE_LIST = 'instrument_manager/UPDATE_LIST'
    CONNECT = 'instrument_manager/CONNECT'
    DISCONNECT = 'instrument_manager/DISCONNECT'


class ActionCreators(object):
    @staticmethod
    def update_list():
        return dict(
            type=ActionTypes.UPDATE_LIST
        )

    @staticmethod
    def connect(id):
        return dict(
            type=ActionTypes.CONNECT,
            id=id
        )

    @staticmethod
    def disconnect(id):
        return dict(
            type=ActionTypes.DISCONNECT,
            id=id
        )


def reducer(state=None, action=None):
    if state is None:
        state = initial_state
    if not (isinstance(action, dict) and 'type' in action):
        return state
    # if action['type'] == ActionTypes.UPDATE_LIST:
    #     state = action['value']
    # elif action['type'] == ActionTypes.CONNECT:
    #     state += 1
    # elif action['type'] == ActionTypes.DISCONNECT:
    #     state -= 1
    return state


if __name__ == '__main__':
    import unittest

    unittest.main()