import os
from dataclasses import dataclass
from pathlib import Path

# The modal shows this many days of run history; retention can never be shorter.
HISTORY_DAYS = 30


@dataclass(frozen=True)
class Settings:
    db_path: Path
    retention_days: int = 90
    # Dev only: serve ../public from the API so you can run without nginx.
    serve_static: bool = False


def load_settings() -> Settings:
    return Settings(
        db_path=Path(os.environ.get("BACKUP_DASH_DB", "backup-dashboard.db")),
        retention_days=max(HISTORY_DAYS, int(os.environ.get("BACKUP_DASH_RETENTION_DAYS", "90"))),
        serve_static=os.environ.get("BACKUP_DASH_SERVE_STATIC") == "1",
    )