Improve calculs in payments

lib/ui/ui_helpers.dart

@@ -144,8 +144,9 @@ String formatAmountWithLocale(String locale, double amount) {
 String formatKAmount(BuildContext context, double amount) =>
     formatAmount(context, amount / 100);
 
-double parseToDoubleLocalized(String locale, String double) =>
-    NumberFormat.decimalPattern(locale).parse(double).toDouble();
+double parseToDoubleLocalized(
+        {required String locale, required String number}) =>
+    NumberFormat.decimalPattern(locale).parse(number).toDouble();
 
 String localizeNumber(BuildContext context, double amount) =>
     NumberFormat.decimalPattern(context.locale.toString()).format(amount);
@@ -241,3 +242,37 @@ ImageIcon get g1nkgoIcon => ImageIcon(
 String get ginkgoIconLocation => assets('img/favicon.png');
 
 String capitalize(String s) => s[0].toUpperCase() + s.substring(1);
+
+double calculate({required String textInTerminal, required String decimalSep}) {
+  String operation = textInTerminal;
+  double sum = 0.0;
+  operation = operation.replaceAll(
+      decimalSep, '.'); // change decimal separator to a dot
+  final RegExp regex = RegExp(r'[\d.]+'); // regular expression to find numbers
+  final Iterable<Match> matches =
+      regex.allMatches(operation); // find all numbers in the input
+  for (final Match? match in matches) {
+    try {
+      if (match != null) {
+        final String? g1 = match.group(0);
+        if (g1 != null) {
+          sum += double.parse(g1); // add the number to the sum
+        }
+      }
+    } catch (e) {
+      // could not convert the number to a double value, ignore it
+    }
+  }
+  // logger(numberFormat.format(sum)); // print the formatted sum
+  return sum;
+}
+
+String decimalSep(BuildContext context) {
+  return NumberFormat.decimalPattern(context.locale.toString())
+      .symbols
+      .DECIMAL_SEP;
+}
+
+Color selectedPatternLock(BuildContext context) => Colors.red;
+
+Color notSelectedPatternLock(BuildContext context) => Colors.amber;