import 'package:flutter/material.dart';
import 'package:flutter_riverpod/flutter_riverpod.dart';
import '../providers/auth_provider.dart';

/// Login page for user authentication
class LoginPage extends ConsumerStatefulWidget {
  const LoginPage({super.key});

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

class _LoginPageState extends ConsumerState<LoginPage> {
  final _formKey = GlobalKey<FormState>();
  final _emailController = TextEditingController();
  final _passwordController = TextEditingController();
  bool _obscurePassword = true;

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

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

    final success = await ref.read(authProvider.notifier).login(
          email: _emailController.text.trim(),
          password: _passwordController.text,
        );

    if (!mounted) return;

    if (success) {
      // Navigate to home or show success
      ScaffoldMessenger.of(context).showSnackBar(
        const SnackBar(content: Text('Login successful!')),
      );
      // TODO: Navigate to home page
    } else {
      final errorMessage = ref.read(authProvider).errorMessage;
      ScaffoldMessenger.of(context).showSnackBar(
        SnackBar(
          content: Text(errorMessage ?? 'Login failed'),
          backgroundColor: Colors.red,
        ),
      );
    }
  }

  @override
  Widget build(BuildContext context) {
    final authState = ref.watch(authProvider);

    return Scaffold(
      appBar: AppBar(
        title: const Text('Login'),
      ),
      body: SafeArea(
        child: Padding(
          padding: const EdgeInsets.all(24.0),
          child: Form(
            key: _formKey,
            child: Column(
              mainAxisAlignment: MainAxisAlignment.center,
              crossAxisAlignment: CrossAxisAlignment.stretch,
              children: [
                // Logo or app name
                Icon(
                  Icons.shopping_cart,
                  size: 80,
                  color: Theme.of(context).primaryColor,
                ),
                const SizedBox(height: 16),
                Text(
                  'Retail POS',
                  textAlign: TextAlign.center,
                  style: Theme.of(context).textTheme.headlineMedium,
                ),
                const SizedBox(height: 48),

                // Email field
                TextFormField(
                  controller: _emailController,
                  keyboardType: TextInputType.emailAddress,
                  decoration: const InputDecoration(
                    labelText: 'Email',
                    prefixIcon: Icon(Icons.email),
                    border: OutlineInputBorder(),
                  ),
                  validator: (value) {
                    if (value == null || value.isEmpty) {
                      return 'Please enter your email';
                    }
                    if (!value.contains('@')) {
                      return 'Please enter a valid email';
                    }
                    return null;
                  },
                ),
                const SizedBox(height: 16),

                // Password field
                TextFormField(
                  controller: _passwordController,
                  obscureText: _obscurePassword,
                  decoration: InputDecoration(
                    labelText: 'Password',
                    prefixIcon: const Icon(Icons.lock),
                    border: const OutlineInputBorder(),
                    suffixIcon: IconButton(
                      icon: Icon(
                        _obscurePassword
                            ? Icons.visibility
                            : Icons.visibility_off,
                      ),
                      onPressed: () {
                        setState(() {
                          _obscurePassword = !_obscurePassword;
                        });
                      },
                    ),
                  ),
                  validator: (value) {
                    if (value == null || value.isEmpty) {
                      return 'Please enter your password';
                    }
                    if (value.length < 8) {
                      return 'Password must be at least 8 characters';
                    }
                    return null;
                  },
                ),
                const SizedBox(height: 24),

                // Login button
                FilledButton(
                  onPressed: authState.isLoading ? null : _handleLogin,
                  child: Padding(
                    padding: const EdgeInsets.symmetric(vertical: 16.0),
                    child: authState.isLoading
                        ? const SizedBox(
                            height: 20,
                            width: 20,
                            child: CircularProgressIndicator(
                              strokeWidth: 2,
                            ),
                          )
                        : const Text('Login'),
                  ),
                ),
                const SizedBox(height: 16),

                // Register link
                TextButton(
                  onPressed: () {
                    // TODO: Navigate to register page
                    // Navigator.push(context, MaterialPageRoute(builder: (_) => const RegisterPage()));
                  },
                  child: const Text('Don\'t have an account? Register'),
                ),
              ],
            ),
          ),
        ),
      ),
    );
  }
}