import 'dart:async';

class PrefetchDebouncer {
  PrefetchDebouncer({
    required this.onPrefetch,
    this.delay = const Duration(milliseconds: 700),
  });

  final Future<void> Function(String host) onPrefetch;
  final Duration delay;

  Timer? _timer;
  bool _disposed = false;

  void schedule(String rawHost) {
    if (_disposed) return;
    _timer?.cancel();
    final host = rawHost.trim();
    if (host.isEmpty) return;
    _timer = Timer(delay, () {
      if (_disposed) return;
      unawaited(onPrefetch(host));
    });
  }

  void dispose() {
    _disposed = true;
    _timer?.cancel();
    _timer = null;
  }
}