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

void main() {
  runApp(const MyApp());
}

class MyApp extends StatelessWidget {
  const MyApp({super.key});

  @override
  Widget build(BuildContext context) {
    return MaterialApp(
      title: 'Login Demo',
      theme: ThemeData(
        colorScheme: ColorScheme.fromSeed(seedColor: Colors.deepPurple),
        useMaterial3: true,
      ),
      home: const LoginPage(),
    );
  }
}

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

  @override
  State<LoginPage> createState() => _LoginPageState();
}

class _LoginPageState extends State<LoginPage> {
  final _formKey = GlobalKey<FormState>();
  final _emailController = TextEditingController();
  final _passwordController = TextEditingController();
  bool _isPasswordVisible = false;
  bool _isLoading = false;

  @override
  void dispose() {
    _emailController.dispose();
    _passwordController.dispose();
    super.dispose();
  }

  String? _validateEmail(String? value) {
    if (value == null || value.isEmpty) {
      return 'Please enter your email';
    }
    final emailRegex = RegExp(r'^[^@]+@[^@]+\.[^@]+');
    if (!emailRegex.hasMatch(value)) {
      return 'Please enter a valid email address';
    }
    return null;
  }

  String? _validatePassword(String? value) {
    if (value == null || value.isEmpty) {
      return 'Please enter your password';
    }
    if (value.length < 6) {
      return 'Password must be at least 6 characters long';
    }
    return null;
  }

  Future<void> _handleLogin() async {
    if (!_formKey.currentState!.validate()) {
      return;
    }

    setState(() {
      _isLoading = true;
    });

    // Simulate login delay
    await Future.delayed(const Duration(seconds: 2));

    setState(() {
      _isLoading = false;
    });

    if (mounted) {
      ScaffoldMessenger.of(context).showSnackBar(
        SnackBar(
          content: Text('Login attempt for ${_emailController.text}'),
          backgroundColor: Colors.green,
        ),
      );
    }
  }

  Widget _buildLoginForm() {
    return AutofillGroup(
      child: Form(
        key: _formKey,
        child: Column(
          mainAxisSize: MainAxisSize.min,
          crossAxisAlignment: CrossAxisAlignment.stretch,
          children: [
            // Logo or Title
            Icon(
              Icons.lock_outline,
              size: 80,
              color: Theme.of(context).colorScheme.primary,
            ),
            const SizedBox(height: 16),
            Text(
              'Welcome Back',
              style: Theme.of(
                context,
              ).textTheme.headlineMedium?.copyWith(fontWeight: FontWeight.bold),
              textAlign: TextAlign.center,
            ),
            const SizedBox(height: 8),
            Text(
              'Sign in to your account',
              style: Theme.of(context).textTheme.bodyLarge?.copyWith(
                color: Theme.of(context).colorScheme.onSurfaceVariant,
              ),
              textAlign: TextAlign.center,
            ),
            const SizedBox(height: 32),

            // Email Field
            TextFormField(
              controller: _emailController,
              keyboardType: TextInputType.emailAddress,
              autofillHints: const [AutofillHints.email],
              decoration: const InputDecoration(
                labelText: 'Email',
                hintText: 'Enter your email address',
                prefixIcon: Icon(Icons.email_outlined),
                border: OutlineInputBorder(),
              ),
              validator: _validateEmail,
              textInputAction: TextInputAction.next,
            ),
            const SizedBox(height: 16),

            // Password Field
            TextFormField(
              controller: _passwordController,
              obscureText: !_isPasswordVisible,
              autofillHints: const [AutofillHints.password],
              decoration: InputDecoration(
                labelText: 'Password',
                hintText: 'Enter your password',
                prefixIcon: const Icon(Icons.lock_outlined),
                suffixIcon: IconButton(
                  icon: Icon(
                    _isPasswordVisible
                        ? Icons.visibility_off_outlined
                        : Icons.visibility_outlined,
                  ),
                  onPressed: () {
                    setState(() {
                      _isPasswordVisible = !_isPasswordVisible;
                    });
                  },
                ),
                border: const OutlineInputBorder(),
              ),
              validator: _validatePassword,
              textInputAction: TextInputAction.done,
              onFieldSubmitted: (_) => _handleLogin(),
            ),
            const SizedBox(height: 24),

            // Login Button
            FilledButton(
              onPressed: _isLoading ? null : _handleLogin,
              style: FilledButton.styleFrom(
                padding: const EdgeInsets.symmetric(vertical: 16),
              ),
              child: _isLoading
                  ? const SizedBox(
                      height: 20,
                      width: 20,
                      child: CircularProgressIndicator(
                        strokeWidth: 2,
                        valueColor: AlwaysStoppedAnimation<Color>(Colors.white),
                      ),
                    )
                  : const Text('Sign In'),
            ),
            const SizedBox(height: 16),

            // Forgot Password Link
            TextButton(
              onPressed: () {
                ScaffoldMessenger.of(context).showSnackBar(
                  const SnackBar(
                    content: Text(
                      'Forgot password functionality not implemented',
                    ),
                  ),
                );
              },
              child: const Text('Forgot Password?'),
            ),
          ],
        ),
      ),
    );
  }

  @override
  Widget build(BuildContext context) {
    final isWeb = kIsWeb;
    final screenWidth = MediaQuery.of(context).size.width;
    final isWideScreen = screenWidth > 600;

    return Scaffold(
      body: SafeArea(
        child: isWeb && isWideScreen
            ? Center(
                child: SingleChildScrollView(
                  padding: const EdgeInsets.all(24),
                  child: ConstrainedBox(
                    constraints: const BoxConstraints(maxWidth: 400),
                    child: Card(
                      elevation: 8,
                      child: Padding(
                        padding: const EdgeInsets.all(32),
                        child: _buildLoginForm(),
                      ),
                    ),
                  ),
                ),
              )
            : SingleChildScrollView(
                padding: const EdgeInsets.all(24),
                child: Column(
                  children: [
                    SizedBox(height: MediaQuery.of(context).size.height * 0.1),
                    _buildLoginForm(),
                  ],
                ),
              ),
      ),
    );
  }
}```

</details>


### Screenshots or Video

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</details>


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