import 'package:flutter/material.dart';
import 'package:flutter_secure_storage/flutter_secure_storage.dart';
import 'screens/login_screen.dart';
import 'screens/phone_screen.dart';

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

  @override
  State<TwpSoftphoneApp> createState() => _TwpSoftphoneAppState();
}

class _TwpSoftphoneAppState extends State<TwpSoftphoneApp> {
  static const _storage = FlutterSecureStorage();
  String? _serverUrl;
  bool _loading = true;

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

  Future<void> _checkSavedSession() async {
    final url = await _storage.read(key: 'server_url');
    if (mounted) {
      setState(() {
        _serverUrl = url;
        _loading = false;
      });
    }
  }

  void _onLoginSuccess(String serverUrl) {
    setState(() {
      _serverUrl = serverUrl;
    });
  }

  void _onLogout() async {
    await _storage.delete(key: 'server_url');
    if (mounted) {
      setState(() {
        _serverUrl = null;
      });
    }
  }

  void _onSessionExpired() {
    // Server URL is still saved, but session cookie is gone.
    // Show login screen but keep the server URL pre-filled.
    if (mounted) {
      setState(() {
        _serverUrl = null;
      });
    }
  }

  @override
  Widget build(BuildContext context) {
    return MaterialApp(
      title: 'TWP Softphone',
      debugShowCheckedModeBanner: false,
      theme: ThemeData(
        colorSchemeSeed: Colors.blue,
        useMaterial3: true,
        brightness: Brightness.light,
      ),
      darkTheme: ThemeData(
        colorSchemeSeed: Colors.blue,
        useMaterial3: true,
        brightness: Brightness.dark,
      ),
      home: _loading
          ? const Scaffold(
              body: Center(child: CircularProgressIndicator()),
            )
          : _serverUrl != null
              ? PhoneScreen(
                  serverUrl: _serverUrl!,
                  onLogout: _onLogout,
                  onSessionExpired: _onSessionExpired,
                )
              : LoginScreen(onLoginSuccess: _onLoginSuccess),
    );
  }
}