from __future__ import annotations
import os
from typing import ForwardRef
from pydantic import BaseModel
from pydantic_settings import BaseSettings, SettingsConfigDict


class ServiceConfig(BaseModel):
    connector: ConnectorConfig


class ConnectorConfig(BaseModel):
    apiKey: str = "orig-key"
    endpoint: str = "orig-endpoint"


class AppSettings(BaseSettings):
    model_config = SettingsConfigDict(
        env_prefix="app_",
        env_nested_delimiter="_",
        case_sensitive=False,
    )
    service: ServiceConfig


os.environ["APP_SERVICE_CONNECTOR_apiKey"] = "ENV_KEY"
os.environ["APP_SERVICE_CONNECTOR_endpoint"] = "ENV_ENDPOINT"

print("is_forward_ref:", isinstance(ServiceConfig.model_fields["connector"].annotation, ForwardRef))
print("without_rebuild:", AppSettings().service.connector)

ServiceConfig.model_rebuild(force=True)
print("with_rebuild:", AppSettings().service.connector)