Átlagszámláló segéd

firka/lib/helpers/average_helper.dart

@@ -0,0 +1,23 @@
+import 'package:firka/helpers/api/model/grade.dart';
+
+double calculateAverage(List<Grade> sortedGrades) {
+  double totalWeight = 0.0;
+  double weightedSum = 0.0;
+
+  for (final grade in sortedGrades) {
+    final value = grade.numericValue;
+    final weight = grade.weightPercentage;
+
+    if (value != null && weight != null) {
+      weightedSum += value * weight;
+      totalWeight += weight;
+    }
+  }
+
+  if (totalWeight == 0) {
+    return double.parse(0.0.toStringAsFixed(2));
+  }
+
+  final avg = weightedSum / totalWeight;
+  return double.parse(avg.toStringAsFixed(2));
+}