import 'package:flutter/material.dart';
import 'package:flutter_bloc/flutter_bloc.dart';
import '../../../core/theme/app_theme.dart';
import '../bloc/auth_bloc.dart';


/// User Login Screen widget.
class LoginScreen extends StatefulWidget {
  const LoginScreen({super.key});

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

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

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

  void _onLogin() {
    if (_formKey.currentState?.validate() ?? false) {
      context.read<AuthBloc>().add(LoginRequested(
            _emailController.text.trim(),
            _passwordController.text.trim(),
          ));
    }
  }

  @override
  Widget build(BuildContext context) {
    return Scaffold(
      body: Center(
        child: SingleChildScrollView(
          padding: const EdgeInsets.all(24),
          child: Container(
            constraints: const BoxConstraints(maxWidth: 400),
            padding: const EdgeInsets.all(28),
            decoration: BoxDecoration(
              color: AppTheme.cardSurface,
              borderRadius: BorderRadius.circular(16),
              border: Border.all(color: AppTheme.glassBorder),
              boxShadow: [
                BoxShadow(
                  color: AppTheme.primaryEmerald.withValues(alpha: 0.08),
                  blurRadius: 24,
                  spreadRadius: 2,
                ),
              ],
            ),
            child: Form(
              key: _formKey,
              child: Column(
                mainAxisSize: MainAxisSize.min,
                children: [
                  Icon(Icons.auto_graph_rounded, size: 54, color: AppTheme.primaryEmerald),
                  const SizedBox(height: 12),
                  const Text(
                    'FINLYTIC',
                    style: TextStyle(fontSize: 24, fontWeight: FontWeight.bold, letterSpacing: 2),
                  ),
                  Text('Enterprise Financial Intelligence', style: TextStyle(color: AppTheme.textMuted, fontSize: 12)),
                  const SizedBox(height: 28),
                  TextFormField(
                    controller: _emailController,
                    decoration: const InputDecoration(labelText: 'E-Mail', prefixIcon: Icon(Icons.email_outlined)),
                    validator: (v) => v == null || !v.contains('@') ? 'Gültige E-Mail erforderlich' : null,
                  ),
                  const SizedBox(height: 16),
                  TextFormField(
                    controller: _passwordController,
                    obscureText: true,
                    decoration: const InputDecoration(labelText: 'Passwort', prefixIcon: Icon(Icons.lock_outline)),
                    validator: (v) => v == null || v.isEmpty ? 'Passwort erforderlich' : null,
                  ),
                  const SizedBox(height: 32),
                  BlocBuilder<AuthBloc, AuthState>(
                    builder: (context, state) {
                      if (state is AuthLoading) {
                        return CircularProgressIndicator(color: AppTheme.primaryEmerald);
                      }
                      return SizedBox(
                        width: double.infinity,
                        height: 48,
                        child: ElevatedButton(
                          onPressed: _onLogin,
                          style: ElevatedButton.styleFrom(
                            backgroundColor: AppTheme.primaryEmerald,
                            foregroundColor: Colors.black,
                            shape: RoundedRectangleBorder(borderRadius: BorderRadius.circular(12)),
                          ),
                          child: const Text('Anmelden', style: TextStyle(fontWeight: FontWeight.bold, fontSize: 15)),
                        ),
                      );
                    },
                  ),
                ],
              ),
            ),
          ),
        ),
      ),
    );
  }
}