processImage method

Future<void> processImage({ required BuildContext context, required InputImage inputImage, required bool canProcess, required bool isBusy, required Function setBusy, required Function setText, required Function updateCustomPaint, required bool isGS1code, required int quantity, required List<GS1Barcode> result, required Function handleError, required Function storeValue, required Function storeCode, required CameraLensDirection cameraLensDirection, required BarcodeScanner barcodeScanner, required ScannerLocalization localizations, })

Implementation

Future<void> processImage({
  required BuildContext context,
  required InputImage inputImage,
  required bool canProcess,
  required bool isBusy,
  required Function setBusy,
  required Function setText,
  required Function updateCustomPaint,
  required bool isGS1code,
  required int quantity,
  required List<GS1Barcode> result,
  required Function handleError,
  required Function storeValue,
  required Function storeCode,
  required CameraLensDirection cameraLensDirection,
  required BarcodeScanner barcodeScanner,
  required ScannerLocalization localizations,
}) async {
  // Check if processing is allowed
  if (!canProcess) return;

  // Check if another processing is in progress
  if (isBusy) return;

  setBusy(true);

  // Clear previous text state
  setText('');

  // Process the image to detect barcodes
  final List<Barcode> barcodes;

  try {
    barcodes = await barcodeScanner.processImage(inputImage);
  } catch (e) {
    debugPrint('Error processing image: $e');
    return;
  }

  // Check if the input image has valid metadata for size and rotation
  if (inputImage.metadata?.size != null &&
      inputImage.metadata?.rotation != null) {
    // If barcodes are found
    if (barcodes.isNotEmpty) {
      final bloc = context.read<DigitScannerBloc>();

      // Check if the widget is scanning GS1 codes
      if (isGS1code) {
        try {
          // Parse the first barcode using GS1BarcodeParser
          final parser = GS1BarcodeParser.defaultParser();
          final parsedResult =
              parser.parse(barcodes.first.displayValue.toString());

          // Check if the barcode has already been scanned
          final alreadyScanned = bloc.state.barCodes.any((element) =>
              element.elements.entries.last.value.data ==
              parsedResult.elements.entries.last.value.data);

          if (alreadyScanned) {
            // Handle error if the barcode is already scanned
            await handleError(
                localizations.translate(i18.scanner.resourceAlreadyScanned));
          } else if (quantity > result.length) {
            // Store the parsed result if the quantity is greater than result length
            await storeValue(parsedResult);
          } else {
            // Handle error if there is a mismatch in the scanned resource count
            await handleError(localizations
                .translate(i18.scanner.scannedResourceCountMisMatch));
          }
        } catch (e) {
          // Handle error if parsing fails
          await handleError(localizations
              .translate(i18.scanner.scannedResourceCountMisMatch));
        }
      } else {
        // For non-GS1 codes
        if (bloc.state.qrCodes.contains(barcodes.first.displayValue)) {
          // Handle error if the QR code is already scanned
          await handleError(
              localizations.translate(i18.scanner.resourceAlreadyScanned));
          return;
        } else {
          // Store the QR code if not already scanned
          await storeCode(barcodes.first.displayValue.toString());
        }
      }
    }

    // Create a custom painter to draw the detected barcodes
    final painter = BarcodeDetectorPainter(
      barcodes,
      inputImage.metadata!.size,
      inputImage.metadata!.rotation,
      cameraLensDirection,
    );
    updateCustomPaint(CustomPaint(painter: painter));
  } else {
    // Display the number of barcodes found and their raw values
    String text =
        '${localizations.translate(i18.scanner.barCodesFound)}: ${barcodes.length}\n\n';
    for (final barcode in barcodes) {
      text +=
          '${localizations.translate(i18.scanner.barCode)}: ${barcode.rawValue}\n\n';
    }
    setText(text);

    // TODO: set _customPaint to draw boundingRect on top of image
    updateCustomPaint(null);
  }

  // Mark the processing as complete
  setBusy(false);
}