Quotation

frontend/pweb/lib/providers/quotation/auto_refresh.dart

@@ -0,0 +1,75 @@
+import 'dart:async';
+
+
+class QuotationAutoRefreshController {
+  bool _enabled = true;
+  Timer? _timer;
+  DateTime? _scheduledAt;
+  DateTime? _triggeredAt;
+
+  void setEnabled(bool enabled) {
+    if (_enabled == enabled) return;
+    _enabled = enabled;
+  }
+
+  void sync({
+    required bool isLoading,
+    required bool canRefresh,
+    required DateTime? expiresAt,
+    required Future<void> Function() onRefresh,
+  }) {
+    if (!_enabled || isLoading || !canRefresh) {
+      _clearTimer();
+      _scheduledAt = null;
+      _triggeredAt = null;
+      return;
+    }
+
+    if (expiresAt == null) {
+      _clearTimer();
+      _scheduledAt = null;
+      _triggeredAt = null;
+      return;
+    }
+
+    final delay = expiresAt.difference(DateTime.now().toUtc());
+    if (delay <= Duration.zero) {
+      if (_triggeredAt != null && _triggeredAt!.isAtSameMomentAs(expiresAt)) {
+        return;
+      }
+      _triggeredAt = expiresAt;
+      _clearTimer();
+      onRefresh();
+      return;
+    }
+
+    if (_scheduledAt != null &&
+        _scheduledAt!.isAtSameMomentAs(expiresAt) &&
+        _timer?.isActive == true) {
+      return;
+    }
+
+    _triggeredAt = null;
+    _clearTimer();
+    _scheduledAt = expiresAt;
+    _timer = Timer(delay, () {
+      onRefresh();
+    });
+  }
+
+  void reset() {
+    _enabled = false;
+    _scheduledAt = null;
+    _triggeredAt = null;
+    _clearTimer();
+  }
+
+  void dispose() {
+    _clearTimer();
+  }
+
+  void _clearTimer() {
+    _timer?.cancel();
+    _timer = null;
+  }
+}