import os


def _bool_env(name: str, default: bool) -> bool:
    raw = os.environ.get(name)
    if raw is None:
        return default
    return raw.strip().lower() in ("1", "true", "yes", "on")


class Config:
    # Beispiel: postgresql://pbt_app:PASSWORT@10.10.10.x/pbt
    SQLALCHEMY_DATABASE_URI = os.environ.get(
        "PBT_DATABASE_URL",
        "postgresql://pbt_app:changeme@postgres/pbt",
    )
    SQLALCHEMY_TRACK_MODIFICATIONS = False
    SECRET_KEY = os.environ.get("PBT_SECRET_KEY", "bitte-in-produktion-aendern")

    # Route preview map (Leaflet/OSM) on the trip form and "Meine Fahrten".
    # Off by default: without real route geometry it only draws a straight
    # line between stops, which isn't worth the extra page weight/CDN calls
    # for most setups. Set PBT_SHOW_MAP=true to turn it on.
    SHOW_MAP = _bool_env("PBT_SHOW_MAP", True)