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

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

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

class _SettingsScreenState extends State<SettingsScreen> {
  final _serverController = TextEditingController();
  final _tokenController = TextEditingController();
  bool _initialized = false;

  @override
  void initState() {
    super.initState();
    _loadSettings();
  }

  Future<void> _loadSettings() async {
    final prefs = await SharedPreferences.getInstance();
    _serverController.text = prefs.getString('server_url') ?? '';
    _tokenController.text = prefs.getString('api_token') ?? '';
    setState(() => _initialized = true);
  }

  Future<void> _save() async {
    final prefs = await SharedPreferences.getInstance();
    await prefs.setString('server_url', _serverController.text.trim());
    await prefs.setString('api_token', _tokenController.text.trim());
    if (!mounted) return;
    ScaffoldMessenger.of(context).showSnackBar(
      const SnackBar(content: Text('设置已保存'), duration: Duration(seconds: 1)),
    );
    Navigator.of(context).pop();
  }

  @override
  void dispose() {
    _serverController.dispose();
    _tokenController.dispose();
    super.dispose();
  }

  @override
  Widget build(BuildContext context) {
    return Scaffold(
      appBar: AppBar(title: const Text('设置')),
      body: _initialized
          ? Padding(
              padding: const EdgeInsets.all(16),
              child: Column(
                crossAxisAlignment: CrossAxisAlignment.start,
                children: [
                  TextField(
                    controller: _serverController,
                    decoration: const InputDecoration(
                      labelText: '服务器地址',
                      hintText: 'https://your-server.com',
                      border: OutlineInputBorder(),
                    ),
                    keyboardType: TextInputType.url,
                  ),
                  const SizedBox(height: 16),
                  TextField(
                    controller: _tokenController,
                    decoration: const InputDecoration(
                      labelText: 'API Token',
                      hintText: '输入认证令牌',
                      border: OutlineInputBorder(),
                    ),
                  ),
                  const SizedBox(height: 24),
                  SizedBox(
                    width: double.infinity,
                    child: FilledButton.icon(
                      onPressed: _save,
                      icon: const Icon(Icons.save),
                      label: const Text('保存'),
                    ),
                  ),
                ],
              ),
            )
          : const Center(child: CircularProgressIndicator()),
    );
  }
}