from pathlib import Path

from pydantic_settings import BaseSettings

PROJECT_ROOT = Path(__file__).parent.parent


class Settings(BaseSettings):
    # required in production and has safe defaults for testing
    anthropic_api_key: str = ""
    model: str = "claude-sonnet-4-5-20250929"
    safedir: str = "./workspace"
    max_tokens: int = 8096
    use_sandbox: bool = True

    model_config = {
        "env_file": PROJECT_ROOT / ".env" if (PROJECT_ROOT / ".env").exists() else None,
        "extra": "ignore",
    }


# create singleton instance, causes validation
settings = Settings()