Add ability to import from openScale backup

app/lib/core/measurement.dart

@@ -1,5 +1,6 @@
 import 'package:flutter/material.dart';
 import 'package:hive/hive.dart';
+import 'package:intl/intl.dart';
 import 'package:provider/provider.dart';
 
 import 'package:trale/core/traleNotifier.dart';
@@ -81,18 +82,39 @@ class Measurement {
     => '${date.toIso8601String()} ${weight.toStringAsFixed(10)}';
 
   /// copy with applying change
-  static Measurement fromString({required String exportString}) {
-    final List<String> strings = exportString.split(' ');
-
-    if (strings.length != 2) {
-      print('error with parsing measurement!');
+  static Measurement fromString({required String exportString, bool native=true}) {
+    if(native){
+      // trale format
+      final List<String> strings = exportString.split(' ');
+
+      if(strings.length != 2){
+        print('error with parsing measurement (trale format)!');
+      }
+
+      return Measurement(
+        weight: double.parse(strings[1]),
+        date: DateTime.parse(strings[0]),
+        isMeasured: true,
+      );
+    } else {
+      // openscale format
+      final List<String> strings = exportString.split(',');
+
+      if(strings.length != 19){
+        print('error with parsing measurement (openscale format)!');
+      }
+
+      final String dateString = strings[8].substring(1, strings[8].length-2);
+      final DateFormat format = DateFormat('yyyy-MM-dd HH:mm');
+      final DateTime date = format.parse(dateString);
+
+
+      return Measurement(
+        weight: double.parse(strings[18]),
+        date: DateTime.parse(date.toIso8601String()),
+        isMeasured: true,
+      );
     }
-
-    return Measurement(
-      weight: double.parse(strings[1]),
-      date: DateTime.parse(strings[0]),
-      isMeasured: true,
-    );
   }
 
   /// compare method to use default sort method on list

app/lib/l10n/app_de.arb

@@ -37,7 +37,7 @@
     "home": "Start",
     "import": "Importiere Backup",
     "importDialog": "Importiere alle Messungen in die aktuelle Messreihe. Dies kann nicht rückgängig gemacht werden!",
-    "importSubtitle": "Importiere Messungen aus einer Backup .txt Datei.",
+    "importSubtitle": "Importiere Messungen aus einer Backup .txt Datei oder einer openScale .csv Datei.",
     "importingAbort": "Import abgebrochen.",
     "interpolation": "Interpolation",
     "intro1": "drücke",

app/lib/l10n/app_en.arb

@@ -104,9 +104,9 @@
     "@import": {
         "description": "Import backup."
     },
-    "importSubtitle": "Import measurements from txt backup file.",
+    "importSubtitle": "Import measurements from txt backup file or openScale csv file.",
     "@importSubtitle": {
-        "description": "Import measurements from txt backup file."
+        "description": "Import measurements from txt backup file or openScale csv file."
     },
     "amoled": "AMOLED",
     "@amoled": {

app/lib/pages/settings.dart

@@ -226,7 +226,7 @@ class ImportListTile extends StatelessWidget {
           if (accepted) {
             final FilePickerResult? pickerResult = await FilePicker.platform.pickFiles(
               type: FileType.custom,
-              allowedExtensions: <String>['txt'],
+              allowedExtensions: <String>['txt','csv'],
             );
             if (
               pickerResult != null &&
@@ -236,9 +236,10 @@ class ImportListTile extends StatelessWidget {
               int measurementCounts = 0;
               for (final String line in file.readAsLinesSync()) {
                 // parse comments
-                if (!line.startsWith('#')) {
+                if (!line.startsWith('#') && !line.startsWith('"')) {
                   final Measurement m = Measurement.fromString(
-                    exportString: line
+                    exportString: line,
+                    native: pickerResult.files.single.extension == 'txt',
                   );
                   final bool wasInserted = db.insertMeasurement(m);
                   if (wasInserted) {