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

class SettingsScreen extends StatefulWidget {
  final bool isFirstRun;
  const SettingsScreen({super.key, this.isFirstRun = false});

  @override
  State<SettingsScreen> createState() => _SettingsScreenState();
}

class _SettingsScreenState extends State<SettingsScreen> {
  final _settings = SettingsService();
  final _urlController = TextEditingController();
  final _apiKeyController = TextEditingController();

  bool _testing = false;
  String? _statusMessage;
  bool? _statusSuccess;

  @override
  void initState() {
    super.initState();
    _load();
    _urlController.addListener(() => setState(() {}));
  }

  Future<void> _load() async {
    final url = await _settings.getServerUrl();
    final key = await _settings.getApiKey();
    if (!mounted) return;
    setState(() {
      _urlController.text = url ?? '';
      _apiKeyController.text = key ?? '';
    });
  }

  Future<void> _testConnection() async {
    setState(() {
      _testing = true;
      _statusMessage = null;
    });

    // Test için önce girilen değerleri geçici olarak kaydediyoruz.
    await _settings.save(
      serverUrl: _urlController.text,
      apiKey: _apiKeyController.text,
    );

    try {
      final service = TranslateService(_settings);
      final langs = await service.fetchLanguages();
      setState(() {
        _statusSuccess = true;
        _statusMessage = 'Bağlantı başarılı — ${langs.length} dil bulundu.';
      });
    } catch (e) {
      setState(() {
        _statusSuccess = false;
        _statusMessage = 'Bağlanamadı: $e';
      });
    } finally {
      setState(() => _testing = false);
    }
  }

  Future<void> _saveAndReturn() async {
    await _settings.save(
      serverUrl: _urlController.text,
      apiKey: _apiKeyController.text,
    );
    if (!mounted) return;
    Navigator.of(context).pop(true);
  }

  @override
  Widget build(BuildContext context) {
    return Scaffold(
      appBar: AppBar(
        title: const Text('Sunucu Ayarları'),
        automaticallyImplyLeading: !widget.isFirstRun,
      ),
      body: SingleChildScrollView(
        padding: const EdgeInsets.all(20),
        child: Column(
          crossAxisAlignment: CrossAxisAlignment.stretch,
          children: [
            if (widget.isFirstRun) ...[
              Text(
                'LibreTranslate Sunucunuza Bağlanın',
                style: Theme.of(context).textTheme.headlineSmall,
              ),
              const SizedBox(height: 8),
              Text(
                'Uygulamanın çeviri yapabilmesi için kendi LibreTranslate sunucunuzun adresini girin.',
                style: Theme.of(context).textTheme.bodyMedium,
              ),
              const SizedBox(height: 24),
            ],
            TextField(
              controller: _urlController,
              keyboardType: TextInputType.url,
              decoration: const InputDecoration(
                labelText: 'Sunucu Adresi',
                hintText: 'https://translate.benimsunucum.com',
                prefixIcon: Icon(Icons.dns_outlined),
              ),
            ),
            const SizedBox(height: 14),
            TextField(
              controller: _apiKeyController,
              obscureText: true,
              decoration: const InputDecoration(
                labelText: 'API Key (opsiyonel)',
                hintText: 'Boş bırakılırsa gönderilmez',
                prefixIcon: Icon(Icons.key_outlined),
              ),
            ),
            const SizedBox(height: 20),
            OutlinedButton.icon(
              onPressed: _testing ? null : _testConnection,
              icon: _testing
                  ? const SizedBox(
                      width: 16,
                      height: 16,
                      child: CircularProgressIndicator(strokeWidth: 2),
                    )
                  : const Icon(Icons.wifi_tethering),
              label: Text(_testing ? 'Test ediliyor...' : 'Bağlantıyı Test Et'),
            ),
            if (_statusMessage != null) ...[
              const SizedBox(height: 12),
              Container(
                padding: const EdgeInsets.all(12),
                decoration: BoxDecoration(
                  color: (_statusSuccess == true
                          ? Colors.green
                          : Colors.red)
                      .withOpacity(0.1),
                  borderRadius: BorderRadius.circular(10),
                ),
                child: Text(
                  _statusMessage!,
                  style: TextStyle(
                    color: _statusSuccess == true
                        ? Colors.green.shade700
                        : Colors.red.shade700,
                  ),
                ),
              ),
            ],
            const SizedBox(height: 24),
            FilledButton.icon(
              onPressed: _urlController.text.trim().isEmpty ? null : _saveAndReturn,
              icon: const Icon(Icons.check),
              label: const Text('Kaydet'),
            ),
          ],
        ),
      ),
    );
  }
}