# Copyright (c) Microsoft Corporation.
# Licensed under the MIT license.

import json
from typing import NewType, Any

import nni

from .serializer import json_loads

# NOTE: this is only for passing flake8, we cannot import RetiariiAdvisor
# because it would induce cycled import
RetiariiAdvisor = NewType('RetiariiAdvisor', Any)

_advisor: 'RetiariiAdvisor' = None


def get_advisor() -> 'RetiariiAdvisor':
    global _advisor
    assert _advisor is not None
    return _advisor


def register_advisor(advisor: 'RetiariiAdvisor'):
    global _advisor
    assert _advisor is None
    _advisor = advisor


def send_trial(parameters: dict, placement_constraint=None) -> int:
    """
    Send a new trial. Executed on tuner end.
    Return a ID that is the unique identifier for this trial.
    """
    return get_advisor().send_trial(parameters, placement_constraint)


def receive_trial_parameters() -> dict:
    """
    Received a new trial. Executed on trial end.
    Reload with our json loads because NNI didn't use Retiarii serializer to load the data.
    """
    params = nni.get_next_parameter()
    params = json_loads(json.dumps(params))
    return params


def get_experiment_id() -> str:
    return nni.get_experiment_id()
