import datetime
from typing import Union

from flask.testing import FlaskClient

from app.dependencies import db
from app.students.models import Group


def assert_model_changes(model: db.Model, expected_data: dict) -> None:
    for key, val in expected_data.items():
        value = getattr(model, key)
        if isinstance(value, datetime.datetime):
            value = value.strftime("%Y-%m-%dT%H:%M:%S.000Z")
        assert value == val


def _test_case_client_without_response(test_client: FlaskClient, url: str, data: Union[dict, None], status_code: int,
                                       method: str = 'post') -> dict:
    method_func = getattr(test_client, method)
    if data is not None:
        response = method_func(url, json=data)
    else:
        response = method_func(url)

    assert response.status_code == status_code
    return response.json


def _test_case_client(test_client: FlaskClient, url: str, data: Union[dict, None], message: str, status_code: int,
                      key: str = 'message', method: str = 'post') -> None:
    response_data = _test_case_client_without_response(test_client, url, data, status_code, method)
    assert key in response_data.keys()
    assert response_data.get(key) == message


def _test_case_group(group: Group, data: dict) -> None:
    assert group.name == data['name']
    assert group.project_supervisor_id == data['project_supervisor_id']

    for st in group.students:
        assert st.index in data['students']