from functools import lru_cache

from pydantic_settings import BaseSettings, SettingsConfigDict
from pydantic import BaseModel
from pathlib import Path
import yaml

class AppConfig(BaseModel):
  host: str = "127.0.0.1"
  port: int = 8000
  reload: bool = True

class Settings(BaseSettings):
  model_config = SettingsConfigDict(env_prefix="KARL_", env_nested_delimiter="__")
  app: AppConfig = AppConfig()

  @classmethod
  def from_yaml(cls, path: Path | str = "config/config.yaml") -> "Settings":
    p = Path(path)
    data = {}
    if p.exists():
      with p.open("r", encoding="utf-8") as fh:
        data = yaml.safe_load(fh) or {}
    return cls(**data)

@lru_cache
def get_settings() -> Settings:
  return Settings.from_yaml()