/// Map and routing endpoints.
///
/// Everything here is open source and keyless:
///
/// * **Tiles** — OpenFreeMap (<https://openfreemap.org>), OpenStreetMap data
///   built with Planetiler and served as MapLibre vector tiles. No API key, no
///   registration, no request limits, MIT licensed. MapLibre adds the required
///   attribution automatically.
/// * **Routing** — OSRM (<https://project-osrm.org>), the Open Source Routing
///   Machine. Also keyless.
///
/// Both are overridable at build time so production can point at self-hosted
/// instances without a code change:
///
///   flutter build apk \
///     --dart-define=OSRM_BASE_URL=https://osrm.internal.nearle.in \
///     --dart-define=MAP_STYLE_URL=https://tiles.internal.nearle.in/styles/liberty
class MapConfig {
  const MapConfig._();

  /// MapLibre style document. Passed straight to the map — no key to inject,
  /// so unlike a commercial provider there is nothing to patch or proxy.
  ///
  /// OpenFreeMap styles: `liberty` (detailed), `bright`, `positron` (muted).
  static const String styleUrl = String.fromEnvironment(
    'MAP_STYLE_URL',
    defaultValue: 'https://tiles.openfreemap.org/styles/liberty',
  );

  /// Base URL of an OSRM instance, without a trailing slash.
  ///
  /// The default is the FOSSGIS community server. It is free and needs no key,
  /// but it is donation-funded infrastructure with a fair-use policy — fine for
  /// development, NOT appropriate for a production delivery fleet. Point this
  /// at your own OSRM before shipping; see `deploy/osrm/README.md`.
  static const String osrmBaseUrl = String.fromEnvironment(
    'OSRM_BASE_URL',
    defaultValue: 'https://routing.openstreetmap.de/routed-car',
  );

  /// True when routing points somewhere other than the shared community server.
  static bool get usingOwnRoutingServer =>
      !osrmBaseUrl.contains('routing.openstreetmap.de');
}