geo_front/lib/screens/login_screen.dart

import 'dart:convert';

import 'package:convert/convert.dart';
import 'package:crypto/crypto.dart';
import 'package:flutter/foundation.dart';
import 'package:flutter/material.dart';
import 'package:geolocator/geolocator.dart';
import 'package:provider/provider.dart';
import '../config/api.dart';
import '../providers/auth_provider.dart';
import '../services/settings_service.dart';

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

  @override
  State<LoginScreen> createState() => _LoginScreenState();
}

class _LoginScreenState extends State<LoginScreen>
    with SingleTickerProviderStateMixin {
  late TabController _tabController;
  final TextEditingController _loginController = TextEditingController();
  final TextEditingController _passwordController = TextEditingController();
  final TextEditingController _secretKeyController = TextEditingController();
  final TextEditingController _serverUrlController = TextEditingController();

  @override
  void initState() {
    super.initState();
    _tabController = TabController(length: 2, vsync: this);
    _tabController.addListener(() {
      setState(() {});
    });
    final settings = context.read<SettingsService>();
    _serverUrlController.text = settings.baseUrl;
  }

  @override
  void dispose() {
    _tabController.dispose();
    _loginController.dispose();
    _passwordController.dispose();
    _secretKeyController.dispose();
    _serverUrlController.dispose();
    super.dispose();
  }

  static const String _secretKey = 'FtracKer*1405.';

  @override
  Widget build(BuildContext context) {
    final authProvider = context.watch<AuthProvider>();
    final settings = context.read<SettingsService>();

    return Scaffold(
      resizeToAvoidBottomInset: true,
      body: SingleChildScrollView(
        child: Center(
          child: Card(
            margin: const EdgeInsets.all(24),
            child: Padding(
              padding: const EdgeInsets.all(24),
              child: ConstrainedBox(
                constraints: const BoxConstraints(maxWidth: 400),
                child: Column(
                  mainAxisSize: MainAxisSize.min,
                  crossAxisAlignment: CrossAxisAlignment.stretch,
                  children: [
                  const Text(
                    'Family Safety',
                    textAlign: TextAlign.center,
                    style: TextStyle(fontSize: 32, fontWeight: FontWeight.bold),
                  ),
                  const SizedBox(height: 24),
                  if (!kIsWeb) ...[
                    TextField(
                      controller: _serverUrlController,
                      decoration: const InputDecoration(
                        labelText: 'Server URL',
                        hintText: 'https://example.com/api',
                        border: OutlineInputBorder(),
                        prefixIcon: Icon(Icons.cloud_outlined),
                      ),
                      keyboardType: TextInputType.url,
                    ),
                    const SizedBox(height: 16),
                  ],
                  TabBar(
                    controller: _tabController,
                    tabs: const [
                      Tab(text: 'Login'),
                      Tab(text: 'Register'),
                    ],
                  ),
                  const SizedBox(height: 24),
                  TextField(
                    controller: _loginController,
                    decoration: const InputDecoration(
                      labelText: 'Login',
                      border: OutlineInputBorder(),
                    ),
                  ),
                  const SizedBox(height: 16),
                  TextField(
                    controller: _passwordController,
                    decoration: const InputDecoration(
                      labelText: 'Password',
                      border: OutlineInputBorder(),
                    ),
                    obscureText: true,
                  ),
                  if (_tabController.index == 1) ...[
                    const SizedBox(height: 16),
                    TextField(
                      controller: _secretKeyController,
                      decoration: const InputDecoration(
                        labelText: 'Secret Key',
                        border: OutlineInputBorder(),
                      ),
                      obscureText: true,
                    ),
                  ],
                  const SizedBox(height: 16),
                  if (authProvider.error.isNotEmpty)
                    Text(
                      authProvider.error,
                      style: const TextStyle(color: Colors.red),
                    ),
                  const SizedBox(height: 16),
                  ElevatedButton(
                    onPressed: authProvider.isLoading
                        ? null
                        : () async {
                            if (!kIsWeb) {
                              final status = await Geolocator.checkPermission();
                              if (status == LocationPermission.denied) {
                                final requested = await Geolocator.requestPermission();
                                if (requested == LocationPermission.denied) {
                                  authProvider.setError('Location permission denied');
                                  return;
                                }
                              }
                              if (status == LocationPermission.deniedForever) {
                                authProvider.setError('Location permission permanently denied. Please enable it in settings.');
                                return;
                              }
                            }
                            if (!kIsWeb) {
                              final newUrl = _serverUrlController.text.trim();
                              if (newUrl.isNotEmpty && newUrl != settings.baseUrl) {
                                ApiConfig.setBaseUrl(newUrl);
                                await settings.setBaseUrl(newUrl);
                              }
                            }
                            if (_tabController.index == 0) {
                              try {
                                await authProvider.login(
                                  _loginController.text,
                                  _passwordController.text,
                                );
                                if (!context.mounted) return;
                                Navigator.of(
                                  context,
                                ).pushReplacementNamed('/map');
                              } catch (e) {
                                // Error is handled by provider
                              }
                            } else {
                              if (_secretKeyController.text != _secretKey) {
                                authProvider.setError('Invalid secret key');
                                return;
                              }
                              Digest digest = md5.convert(
                                utf8.encode(_secretKeyController.text),
                              );
                              String secretKeyHash = hex.encode(digest.bytes);
                              try {
                                await authProvider.register(
                                  _loginController.text,
                                  _passwordController.text,
                                  secretKeyHash,
                                );
                              } catch (e) {
                                // Error is handled by provider
                              }
                            }
                          },
                    child: authProvider.isLoading
                        ? const SizedBox(
                            height: 20,
                            width: 20,
                            child: CircularProgressIndicator(strokeWidth: 2),
                          )
                        : Text(
                            _tabController.index == 0 ? 'Login' : 'Register',
                          ),
                  ),
                ],
              ),
            ),
          ),
        ),
        ),
      ),
    );
  }
}