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

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

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

class _LoginScreenState extends State<LoginScreen> {
  final _emailController = TextEditingController();
  final _passwordController = TextEditingController();
  final _formKey = GlobalKey<FormState>();

  void _login() async {
    if (_formKey.currentState!.validate()) {
      try {
        await context.read<AuthProvider>().login(
          _emailController.text.trim(),
          _passwordController.text.trim(),
        );
      } catch (e) {
        if (mounted) {
          ScaffoldMessenger.of(context).showSnackBar(
            SnackBar(
              content: Text('Login failed: ${e.toString()}'), 
              backgroundColor: Colors.red,
              behavior: SnackBarBehavior.floating,
              margin: const EdgeInsets.all(20),
            ),
          );
        }
      }
    }
  }

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

  @override
  Widget build(BuildContext context) {
    final bool isLoading = context.watch<AuthProvider>().isLoading;

    return Scaffold(
      body: Stack(
        children: [
          // Background Gradient
          Container(
            decoration: const BoxDecoration(
              gradient: LinearGradient(
                colors: [Color(0xFF6366F1), Color(0xFF4338CA)],
                begin: Alignment.topLeft,
                end: Alignment.bottomRight,
              ),
            ),
          ),
          // Decorative circles
          Positioned(
            top: -100,
            right: -100,
            child: CircleAvatar(
              radius: 150,
              backgroundColor: Colors.white.withOpacity(0.1),
            ),
          ),
          Positioned(
            bottom: -50,
            left: -50,
            child: CircleAvatar(
              radius: 100,
              backgroundColor: Colors.white.withOpacity(0.05),
            ),
          ),
          Center(
            child: SingleChildScrollView(
              padding: const EdgeInsets.all(28.0),
              child: Column(
                mainAxisAlignment: MainAxisAlignment.center,
                children: [
                  const Icon(Icons.rocket_launch_rounded, size: 72, color: Colors.white),
                  const SizedBox(height: 24),
                  const Text(
                    'ANTIGRAVITY',
                    style: TextStyle(
                      color: Colors.white,
                      fontSize: 32,
                      fontWeight: FontWeight.bold,
                      letterSpacing: 2.0,
                    ),
                  ),
                  const Text(
                    'TEAM COLLABORATION',
                    style: TextStyle(
                      color: Colors.white70,
                      fontSize: 12,
                      fontWeight: FontWeight.bold,
                      letterSpacing: 1.5,
                    ),
                  ),
                  const SizedBox(height: 48),
                  Container(
                    padding: const EdgeInsets.all(28),
                    decoration: BoxDecoration(
                      color: Colors.white,
                      borderRadius: BorderRadius.circular(32),
                      boxShadow: [
                        BoxShadow(
                          color: Colors.black.withOpacity(0.1),
                          blurRadius: 20,
                          offset: const Offset(0, 10),
                        ),
                      ],
                    ),
                    child: Form(
                      key: _formKey,
                      child: Column(
                        crossAxisAlignment: CrossAxisAlignment.stretch,
                        children: [
                          const Text(
                            'Welcome Back',
                            textAlign: TextAlign.center,
                            style: TextStyle(
                              fontSize: 22,
                              fontWeight: FontWeight.bold,
                              color: Color(0xFF1E293B),
                            ),
                          ),
                          const SizedBox(height: 8),
                          Text(
                            'Enter your credentials to continue',
                            textAlign: TextAlign.center,
                            style: TextStyle(
                              fontSize: 13,
                              color: Colors.grey.shade500,
                            ),
                          ),
                          const SizedBox(height: 32),
                          TextFormField(
                            controller: _emailController,
                            keyboardType: TextInputType.emailAddress,
                            decoration: const InputDecoration(
                              labelText: 'Email Address',
                              prefixIcon: Icon(Icons.alternate_email_rounded, size: 20),
                            ),
                            validator: (value) => 
                              (value == null || !value.contains('@')) ? 'Enter a valid email' : null,
                          ),
                          const SizedBox(height: 16),
                          TextFormField(
                            controller: _passwordController,
                            obscureText: true,
                            decoration: const InputDecoration(
                              labelText: 'Password',
                              prefixIcon: Icon(Icons.lock_person_rounded, size: 20),
                            ),
                            validator: (value) => 
                              (value == null || value.length < 6) ? 'Enter at least 6 characters' : null,
                          ),
                          const SizedBox(height: 32),
                          isLoading 
                            ? const Center(child: CircularProgressIndicator())
                            : ElevatedButton(
                                onPressed: _login, 
                                child: const Text('SIGN IN TO DASHBOARD'),
                              ),
                        ],
                      ),
                    ),
                  ),
                  const SizedBox(height: 32),
                  const Text(
                    'Need an account? Contact your lead.',
                    style: TextStyle(color: Colors.white70, fontSize: 13),
                  ),
                ],
              ),
            ),
          ),
        ],
      ),
    );
  }
}