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lib/utils/work_time.dart

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+import 'package:flutter/material.dart';
+import '../models/work_interval.dart';
+
+int _toMinutes(TimeOfDay t) => t.hour * 60 + t.minute;
+
+/// Effektive Arbeitsminuten eines Tages nach Pausenregel:
+/// - <= 6h Arbeit: keine Pflichtpause
+/// - > 6h Arbeit: 30 Min Pflichtpause, reduziert um die Summe der Lücken
+///   zwischen Intervallen (maximal bis 0 reduzierbar).
+int effectiveWorkedMinutes(
+  List<WorkInterval> intervals, {
+  int requiredBreakOver6h = 30,
+}) {
+  if (intervals.isEmpty) return 0;
+
+  // sortieren
+  final sorted = [...intervals]
+    ..sort((a, b) => _toMinutes(a.start).compareTo(_toMinutes(b.start)));
+
+  // Arbeitszeit summieren
+  int worked = 0;
+  for (final iv in sorted) {
+    final w = _toMinutes(iv.end) - _toMinutes(iv.start);
+    if (w > 0) worked += w;
+  }
+
+  if (worked <= 6 * 60) return worked;
+
+  // Lücken summieren
+  int gaps = 0;
+  for (var i = 0; i < sorted.length - 1; i++) {
+    final gap = _toMinutes(sorted[i + 1].start) - _toMinutes(sorted[i].end);
+    if (gap > 0) gaps += gap;
+  }
+
+  final extraBreak = (requiredBreakOver6h - gaps).clamp(0, requiredBreakOver6h);
+  final effective = worked - extraBreak;
+  return effective < 0 ? 0 : effective;
+}