class CameraHandler { late BuildContext context; late Function(String) onPictureTaken; late String base64Image; CameraController? _controller; Future? _initializeControllerFuture; List? _cameras; final String logTag = 'CameraHandler'; bool _isCameraInitialized = false;

CameraHandler(BuildContext context, Function(String) onPictureTaken, {String base64Image = ''}) { this.context = context; this.onPictureTaken = onPictureTaken; this.base64Image = base64Image; }

// Initialize Camera Future _initializeCamera() async { if (_isCameraInitialized) return;

try {
  debugPrint('$logTag: Fetching available cameras...');
  _cameras = await availableCameras();

  if (_cameras == null || _cameras!.isEmpty) {
    debugPrint('$logTag: No cameras available.');
    return;
  }

  final frontCamera = _cameras!.firstWhere(
        (camera) => camera.lensDirection == CameraLensDirection.front,
    orElse: () => throw Exception("No front camera found."),
  );

  debugPrint('$logTag: Initializing front camera: ${frontCamera.name}');
      _controller = CameraController(frontCamera, ResolutionPreset.high, enableAudio: false); 


  // Initialize the controller properly and wait for completion
  _initializeControllerFuture = _controller!.initialize();
  await _initializeControllerFuture;

  _isCameraInitialized = true;  // Mark camera as initialized

  debugPrint('$logTag: Camera initialized successfully.');
} catch (e) {
  debugPrint('$logTag: Error initializing camera: $e');
  Fluttertoast.showToast(msg: "Error initializing camera.");
}

}

// Open the camera and capture a picture Future<String?> openCameraAndTakePicture() async { try { WidgetsFlutterBinding.ensureInitialized(); await _initializeCamera();

  if (_controller == null || !_controller!.value.isInitialized) {
    debugPrint('$logTag: Camera controller is not initialized.');
    return null;
  }

  // Ensure camera is fully initialized before capturing
  await _initializeControllerFuture;

  debugPrint('$logTag: Capturing image...');
  final image = await _controller!.takePicture();
  debugPrint('$logTag: Picture taken.');

  // Process Image
  img.Image? originalImage = img.decodeImage(await image.readAsBytes());
  if (originalImage != null) {
    img.Image compressedImage = img.copyResize(originalImage, width: 600);
    List<int> compressedBytes = img.encodeJpg(compressedImage, quality: 85);
    String base64Image = base64Encode(compressedBytes);

    debugPrint('$logTag: Image successfully captured and compressed.');
    return base64Image;
  } else {
    debugPrint('$logTag: Failed to decode image.');
  }
} catch (e) {
  debugPrint('$logTag: Error capturing picture: $e');
  Fluttertoast.showToast(msg: "Error capturing picture.");
} finally {

}
return null;

}

// Dispose Camera when done using it Future disposeCamera() async { try { if (_controller != null && _isCameraInitialized) { debugPrint('$logTag: Disposing camera controller...'); await _controller!.dispose(); _controller = null; _isCameraInitialized = false; // Reset flag debugPrint('$logTag: Camera disposed successfully.'); } } catch (e) { debugPrint('$logTag: Error disposing camera: $e'); } } }