Fix date extraction

moneymgr_mobile/lib/routes/scan/scan_screen.dart

@@ -4,6 +4,7 @@ import 'package:flutter/material.dart';
 import 'package:hooks_riverpod/hooks_riverpod.dart';
 import 'package:logging/logging.dart';
 import 'package:moneymgr_mobile/services/storage/expenses.dart';
+import 'package:moneymgr_mobile/services/storage/prefs.dart';
 import 'package:moneymgr_mobile/utils/ocr_utils.dart';
 import 'package:moneymgr_mobile/utils/pdf_utils.dart';
 import 'package:moneymgr_mobile/widgets/expense_editor.dart';
@@ -13,10 +14,15 @@ part 'scan_screen.g.dart';
 
 /// Scan a document & return generated PDF as byte file
 @riverpod
-Future<(Uint8List?, double?)> _scanDocument(Ref ref) async {
+Future<(Uint8List?, BaseExpenseInfo?)> _scanDocument(Ref ref) async {
+  final prefs = ref.watch(prefsProvider).requireValue;
+
   final pdf = await scanDocAsPDF();
   final img = await renderPdf(pdfBytes: pdf);
-  final amount = await extractTotalFromBill(img);
+  final amount = await extractInfoFromBill(
+    imgBuff: img,
+    extractDates: !prefs.disableExtractDates(),
+  );
   return (pdf, amount);
 }
 
@@ -42,11 +48,7 @@ class ScanScreen extends HookConsumerWidget {
       child: switch (scanDocProvider) {
         AsyncData(:final value) when value.$1 != null => ExpenseEditor(
           file: value.$1!,
-          initialData: BaseExpenseInfo(
+          initialData: value.$2,
-            label: null,
-            cost: value.$2 ?? 0.0,
-            time: DateTime.now(),
-          ),
           onFinished: (expense) async {
             await expenses.add(
               info: expense,

moneymgr_mobile/lib/routes/settings/settings_screen.dart

@@ -22,6 +22,11 @@ class SettingsScreen extends ConsumerWidget {
       ref.invalidate(prefsProvider);
     }
 
+    handleToggleDisableExtractDate(v) async {
+      await prefs.setDisableExtractDates(v);
+      ref.invalidate(prefsProvider);
+    }
+
     return Scaffold(
       appBar: AppBar(title: const Text('Settings')),
       body: ListView(
@@ -40,6 +45,14 @@ class SettingsScreen extends ConsumerWidget {
               "Do not start camera automatically on application startup",
             ),
           ),
+          SwitchListTile(
+            value: prefs.disableExtractDates(),
+            onChanged: handleToggleDisableExtractDate,
+            title: Text("Do not extract dates"),
+            subtitle: Text(
+              "Do not attempt to extract dates from scanned expenses",
+            ),
+          ),
           const Divider(),
           ListTile(
             leading: const Icon(Icons.info_outline),

moneymgr_mobile/lib/services/storage/prefs.dart

@@ -23,6 +23,14 @@ extension MoneyMgrSharedPreferences on SharedPreferencesWithCache {
     await setBool("startOnScansListScreen", start);
   }
 
+  bool disableExtractDates() {
+    return getBool("disableExtractDates") ?? false;
+  }
+
+  Future<void> setDisableExtractDates(bool disable) async {
+    await setBool("disableExtractDates", disable);
+  }
+
   ServerConfig? serverConfig() {
     final json = getString("serverConfig");
     if (json != null) return ServerConfig.fromJson(jsonDecode(json));

moneymgr_mobile/lib/utils/ocr_utils.dart

@@ -5,9 +5,13 @@ 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';
+import 'package:moneymgr_mobile/services/storage/expenses.dart';
 
-/// Attempt to extract total amount from invoice image
+/// Attempt to extract information from invoice image
-Future<double?> extractTotalFromBill(Uint8List imgBuff) async {
+Future<BaseExpenseInfo?> extractInfoFromBill({
+  required Uint8List imgBuff,
+  required bool extractDates,
+}) async {
   final decodedImage = await decodeImageFromList(imgBuff);
 
   final byteData = await decodedImage.toByteData(
@@ -25,20 +29,58 @@ Future<double?> extractTotalFromBill(Uint8List imgBuff) async {
 
   Logger.root.fine("Expense text: ${extractionResult.text}");
 
-  // Check for highest amount on invoice
+  // Check for highestCost amount on invoice
-  final regexp = RegExp(
+  final costRegexp = RegExp(
     r'([0-9]+([ ]*(\\.|,)[ ]*[0-9]{1,2}){0,1})([ \\t\\n]*(EUR|eur|€)|E)',
     multiLine: true,
     caseSensitive: false,
   );
-  var highest = 0.0;
+  var highestCost = 0.0;
-  for (final match in regexp.allMatches(extractionResult.text)) {
+  for (final match in costRegexp.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);
+    highestCost = max(highestCost, double.tryParse(value) ?? 0.0);
   }
 
-  return highest == 0.0 ? null : highest;
+  // Check for highestCost amount on invoice
+  final dateRegexp = RegExp(
+    r'([0-3][0-9])(\/|-)([0-1][0-9])(\/|-)((20|)[0-9]{2})',
+    multiLine: false,
+    caseSensitive: false,
+  );
+  final currDate = DateTime.now();
+  DateTime? newest;
+  for (final match in dateRegexp.allMatches(extractionResult.text)) {
+    if (match.groupCount < 6) continue;
+
+    int year = int.tryParse(match.group(5)!) ?? currDate.year;
+
+    try {
+      final date = DateTime(
+        year > 99 ? year : (2000 + year),
+        int.tryParse(match.group(3)!) ?? currDate.month,
+        int.tryParse(match.group(1)!) ?? currDate.day,
+      );
+
+      if (newest == null) {
+        newest = date;
+      } else {
+        newest = DateTime.fromMillisecondsSinceEpoch(
+          max(newest.millisecondsSinceEpoch, date.millisecondsSinceEpoch),
+        );
+      }
+    } catch (e, s) {
+      Logger.root.warning("Failed to parse date! $e$s");
+    }
+  }
+
+  return BaseExpenseInfo(
+    label: null,
+    cost: highestCost,
+    time: extractDates && (newest?.isBefore(currDate) ?? false)
+        ? newest!
+        : currDate,
+  );
 }

moneymgr_mobile/lib/widgets/expense_editor.dart

@@ -40,6 +40,11 @@ class ExpenseEditor extends HookConsumerWidget {
 
     final (:pending, :snapshot, :hasError) = useAsyncTask();
 
+    // Clear cost value
+    handleClearCost() {
+      costController.text = "";
+    }
+
     // Pick a new date
     handlePickDate() async {
       final date = await showDatePicker(
@@ -94,6 +99,19 @@ class ExpenseEditor extends HookConsumerWidget {
       }
     }
 
+    // Open invoice in full screen
+    handleFullScreenInvoice() {
+      showDialog(
+        context: context,
+        builder: (c) => Scaffold(
+          appBar: AppBar(title: Text("Expense")),
+          body: SingleChildScrollView(
+            child: PDFViewer(pdfBytes: file, fit: BoxFit.fitWidth),
+          ),
+        ),
+      );
+    }
+
     return Scaffold(
       appBar: AppBar(
         title: Text("Expense info"),
@@ -125,8 +143,11 @@ class ExpenseEditor extends HookConsumerWidget {
         children: [
           // Expense preview
           Expanded(
+            child: GestureDetector(
+              onTap: handleFullScreenInvoice,
               child: PDFViewer(pdfBytes: file, fit: BoxFit.contain),
             ),
+          ),
 
           SizedBox(height: 10),
 
@@ -137,7 +158,13 @@ class ExpenseEditor extends HookConsumerWidget {
               decimal: true,
               signed: false,
             ),
-            decoration: const InputDecoration(labelText: 'Cost'),
+            decoration: InputDecoration(
+              labelText: 'Cost',
+              suffixIcon: IconButton(
+                onPressed: handleClearCost,
+                icon: const Icon(Icons.clear),
+              ),
+            ),
             textInputAction: TextInputAction.done,
           ),