import 'package:flutter/material.dart';
import 'package:dio/dio.dart';
import '../../core/config.dart';

class PingTestScreen extends StatefulWidget {
  const PingTestScreen({super.key});

  @override
  State<PingTestScreen> createState() => _PingTestScreenState();
}

class _PingTestScreenState extends State<PingTestScreen> {
  String? _result;
  bool _loading = false;

  Future<void> _pingServer() async {
    setState(() {
      _loading = true;
      _result = null;
    });

    try {
      final res = await Dio(BaseOptions(
        baseUrl: AppConfig.backendBaseUrl,
        headers: const {
          'Accept': 'application/json',
        },
        contentType: Headers.jsonContentType,
        validateStatus: (s) => s != null && s < 500,
      )).post('', data: {'action': 'ping'});

      setState(() {
        _result = '✅ Antwort: ${res.data}';
      });
    } catch (e) {
      setState(() {
        _result = '❌ Fehler: $e';
      });
    } finally {
      setState(() => _loading = false);
    }
  }

  @override
  Widget build(BuildContext context) {
    return Scaffold(
      appBar: AppBar(title: const Text('Ping-Test')),
      body: Center(
        child: Padding(
          padding: const EdgeInsets.all(16),
          child: Column(
            mainAxisAlignment: MainAxisAlignment.center,
            children: [
              ElevatedButton.icon(
                icon: const Icon(Icons.wifi_tethering),
                label: const Text('Ping-Server'),
                onPressed: _loading ? null : _pingServer,
              ),
              const SizedBox(height: 20),
              if (_loading) const CircularProgressIndicator(),
              if (_result != null)
                SelectableText(
                  _result!,
                  textAlign: TextAlign.center,
                  style: const TextStyle(fontSize: 14),
                ),
            ],
          ),
        ),
      ),
    );
  }
}