from functools import lru_cache
from pathlib import Path

from pydantic_settings import BaseSettings, SettingsConfigDict


class Settings(BaseSettings):
    """Application settings sourced from environment / .env file."""

    model_config = SettingsConfigDict(
        env_file=".env",
        env_file_encoding="utf-8",
        extra="ignore",
    )

    yunke_base_url: str = "https://crm2.yunkecn.com"
    yunke_username: str = ""
    yunke_password: str = ""
    db_url: str = "mysql+asyncmy://user:pass@localhost:3306/yunke"
    redis_url: str = "redis://localhost:6379/0"
    media_dir: Path = Path("./media")
    # Fernet key for encrypting stored credentials. Required for real runs;
    # empty default lets tests construct Settings without a key.
    encryption_key: str = ""


@lru_cache
def get_settings() -> Settings:
    """Return the process-wide Settings singleton."""
    return Settings()