Perform first OCR extraction

moneymgr_mobile/lib/utils/ocr_utils.dart

@@ -0,0 +1,44 @@
+import 'dart:math';
+import 'dart:typed_data';
+import 'dart:ui' as ui;
+
+import 'package:flutter/material.dart';
+import 'package:google_mlkit_text_recognition/google_mlkit_text_recognition.dart';
+import 'package:logging/logging.dart';
+
+/// Attempt to extract total amount from invoice image
+Future<double?> extractTotalFromBill(Uint8List imgBuff) async {
+  final decodedImage = await decodeImageFromList(imgBuff);
+
+  final byteData = await decodedImage.toByteData(
+    format: ui.ImageByteFormat.rawRgba,
+  );
+
+  final image = InputImage.fromBitmap(
+    bitmap: byteData!.buffer.asUint8List(),
+    width: decodedImage.width,
+    height: decodedImage.height,
+  );
+
+  final textRecognizer = TextRecognizer(script: TextRecognitionScript.latin);
+  final extractionResult = await textRecognizer.processImage(image);
+
+  Logger.root.fine("Expense text: ${extractionResult.text}");
+
+  // Check for highest amount on invoice
+  final regexp = RegExp(
+    r'([0-9]+([ ]*(\\.|,)[ ]*[0-9]{1,2}){0,1})[ \\t\\n]*(EUR|eur|€)',
+    multiLine: true,
+    caseSensitive: false,
+  );
+  var highest = 0.0;
+  for (final match in regexp.allMatches(extractionResult.text)) {
+    if (match.groupCount == 0) continue;
+
+    // Process only numeric value
+    final value = (match.group(1) ?? "").replaceAll(",", ".");
+    highest = max(highest, double.tryParse(value) ?? 0.0);
+  }
+
+  return highest == 0.0 ? null : highest;
+}

moneymgr_mobile/lib/utils/pdf_utils.dart

@@ -6,14 +6,40 @@ import 'package:flutter/material.dart';
 import 'package:path/path.dart' as p;
 import 'package:path_provider/path_provider.dart';
 import 'package:pdf_image_renderer/pdf_image_renderer.dart';
+import 'package:scanbot_sdk/scanbot_sdk.dart';
+import 'package:scanbot_sdk/scanbot_sdk_ui_v2.dart' hide IconButton, EdgeInsets;
 
+/// Scan document as PDF
+Future<Uint8List> scanDocAsPDF() async {
+  var configuration = DocumentScanningFlow(
+    appearance: DocumentFlowAppearanceConfiguration(
+      statusBarMode: StatusBarMode.DARK,
+    ),
+    cleanScanningSession: true,
+    outputSettings: DocumentScannerOutputSettings(pagesScanLimit: 1),
+    screens: DocumentScannerScreens(
+      review: ReviewScreenConfiguration(enabled: false),
+    ),
+  );
+  var documentResult = await ScanbotSdkUiV2.startDocumentScanner(configuration);
+
+  if (documentResult.status != OperationStatus.OK) {
+    throw Exception("Scanner failed with status ${documentResult.status}");
+  }
+
+  // Convert result to PDF
+  var result = await ScanbotSdk.document.createPDFForDocument(
+    PDFFromDocumentParams(
+      documentID: documentResult.data!.uuid,
+      pdfConfiguration: PdfConfiguration(),
+    ),
+  );
+  final pdfPath = result.pdfFileUri.replaceFirst("file://", "");
+  return File(pdfPath).readAsBytes();
+}
 
 /// Render PDF to image bits
-Future<Uint8List> renderPdf(
-     {
-      String? path,
-      Uint8List? pdfBytes,
-    }) async {
+Future<Uint8List> renderPdf({String? path, Uint8List? pdfBytes}) async {
   assert(path != null || pdfBytes != null);
 
   // Create temporary file if required
@@ -62,4 +88,4 @@ Future<Uint8List> renderPdf(
       await File(path).delete();
     }
   }
-}
+}