import 'package:flutter/foundation.dart';
import 'package:flutter/services.dart';

/// Whether this device has any camera. Resolved once at startup (via the native
/// channel, `PackageManager.FEATURE_CAMERA_ANY`) and cached so `build()` methods
/// can read it synchronously — the QR scan button ([qrScanSupported]) and the
/// photo-source sheet hide their camera options when it is false.
///
/// Defaults to `true` so a normal phone never loses camera UI over a transient
/// channel error; only genuinely camera-less devices (Chromebooks, Android
/// Automotive, some TVs — kept installable by the `uses-feature required=false`
/// in AndroidManifest) flip it to false. Non-Android platforms keep the default
/// (iOS devices have a camera; desktop/web gate camera UI elsewhere).
bool _deviceHasCamera = true;

bool get deviceHasCamera => _deviceHasCamera;

@visibleForTesting
set deviceHasCamera(bool value) => _deviceHasCamera = value;

const _channel = MethodChannel('org.comunes.tane/coarse_location');

/// Queries the native camera-presence check and caches it. Called once during
/// bootstrap, before the first real frame, so synchronous readers see the right
/// value. Android-only; elsewhere the default stands. Never throws — a channel
/// error leaves the safe default in place.
Future<void> initCameraAvailability() async {
  if (defaultTargetPlatform != TargetPlatform.android) return;
  try {
    final has = await _channel.invokeMethod<bool>('hasCamera');
    if (has != null) _deviceHasCamera = has;
  } catch (_) {
    // Keep the default; a normal phone shouldn't lose camera UI over this.
  }
}