import 'package:flutter/material.dart';
import 'package:flutter/services.dart';

class TusYayilmasiEngelleWidget extends StatefulWidget {
  final Widget child;
  final bool Function(KeyEvent event) shouldBlockKey;

  const TusYayilmasiEngelleWidget({
    super.key,
    required this.child,
    required this.shouldBlockKey,
  });

  @override
  _TusYayilmasiEngelleWidgetState createState() => _TusYayilmasiEngelleWidgetState();
}

class _TusYayilmasiEngelleWidgetState extends State<TusYayilmasiEngelleWidget> with WidgetsBindingObserver {
  final FocusNode _focusNode = FocusNode();
  bool _isFocused = false;
  int? _lastEventHash;
  int _lastBackPressTime = 0; // Son geri tuşu zamanı

  @override
  void initState() {
    super.initState();
    WidgetsBinding.instance.addObserver(this);
    _forceFocus();
  }

  @override
  void dispose() {
    WidgetsBinding.instance.removeObserver(this);
    _focusNode.dispose();
    super.dispose();
  }

  @override
  void didChangeAppLifecycleState(AppLifecycleState state) {
    if (state == AppLifecycleState.resumed) {
      Future.delayed(const Duration(milliseconds: 0), _forceFocus);
    }
  }

  void _forceFocus() {
    WidgetsBinding.instance.addPostFrameCallback((_) {
      if (!mounted || _focusNode.hasFocus) return;
      FocusScope.of(context).unfocus();
      _focusNode.requestFocus();
      _isFocused = true;
    });
  }

  KeyEventResult _handleKeyEvent(FocusNode node, KeyEvent event) {
    if (event is! KeyDownEvent) return KeyEventResult.ignored; // Sadece KeyDown işleyelim

    int eventHash = event.hashCode;
    if (_lastEventHash == eventHash) {
      return KeyEventResult.handled; // Aynı olay tekrar işlenmesin
    }
    _lastEventHash = eventHash;

    // Eğer geri tuşuna basılmışsa ve çok kısa süre içinde tekrar edilirse engelle
    if (event.logicalKey == LogicalKeyboardKey.escape || event.logicalKey == LogicalKeyboardKey.goBack) {
      int now = DateTime.now().millisecondsSinceEpoch;
      if (now - _lastBackPressTime < 500) {
        return KeyEventResult.handled; // Çift basılmasını önlüyoruz
      }
      _lastBackPressTime = now;
    }

    if (widget.shouldBlockKey(event)) {
      return KeyEventResult.handled;
    }
    return KeyEventResult.ignored;
  }

  @override
  Widget build(BuildContext context) {
    return GestureDetector(
      onTap: _forceFocus,
      child: Focus(
        focusNode: _focusNode,
        autofocus: true,
        canRequestFocus: true,
        skipTraversal: true,
        onFocusChange: (value) => _isFocused = value,
        onKeyEvent: _handleKeyEvent,
        child: widget.child,
      ),
    );
  }
}