// lib/screens/login_screen.dart

import 'package:flutter/material.dart';
import '../features/auth/services/auth_service.dart';
import 'home_screen.dart';
import '../core/app_decoration.dart';

class LoginScreen extends StatefulWidget {
  const LoginScreen({Key? key}) : super(key: key);

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

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

  final TextEditingController _emailCtrl = TextEditingController();
  final TextEditingController _passCtrl = TextEditingController();
  final FocusNode _emailFocus = FocusNode();
  final FocusNode _passFocus = FocusNode();

  final AuthService _auth = AuthService();
  bool _loading = false;

  @override
  void dispose() {
    _emailCtrl.dispose();
    _passCtrl.dispose();
    _emailFocus.dispose();
    _passFocus.dispose();
    super.dispose();
  }

  String? _emailValidator(String? v) {
    if (v == null || v.trim().isEmpty) return 'Enter email';
    final email = v.trim();
    // Basic email pattern check
    final emailRegex = RegExp(r"^[^@]+@[^@]+\.[^@]+");
    if (!emailRegex.hasMatch(email)) return 'Enter a valid email';
    return null;
  }

  String? _passwordValidator(String? v) {
    if (v == null || v.trim().isEmpty) return 'Enter password';
    if (v.length < 6) return 'Password must be at least 6 characters';
    return null;
  }

  Future<void> _performLogin() async {
    final form = _formKey.currentState;
    if (form == null) return;
    if (!form.validate()) return;

    final email = _emailCtrl.text.trim();
    final password = _passCtrl.text;

    setState(() => _loading = true);

    try {
      // AuthService.login now returns a UserModel and also persists profile info.
      await _auth.login(email, password);

      if (!mounted) return;
      // small delay for UX
      await Future.delayed(const Duration(milliseconds: 150));

      Navigator.of(context).pushReplacement(PageRouteBuilder(
        pageBuilder: (context, a1, a2) => const HomeScreen(),
        transitionDuration: const Duration(milliseconds: 650),
        reverseTransitionDuration: const Duration(milliseconds: 350),
        transitionsBuilder: (context, animation, secondaryAnimation, child) {
          return FadeTransition(opacity: animation, child: child);
        },
      ));
    } catch (e) {
      if (!mounted) return;
      final message = e.toString().replaceAll('Exception: ', '');
      ScaffoldMessenger.of(context).showSnackBar(SnackBar(content: Text(message)));
    } finally {
      if (mounted) setState(() => _loading = false);
    }
  }

  void _openRegister() {
    Navigator.of(context).push(MaterialPageRoute(builder: (_) => const RegisterScreen(isDesktop: false)));
  }

  @override
  Widget build(BuildContext context) {
    const primary = Color(0xFF0B63D6);
    final width = MediaQuery.of(context).size.width;

    return Scaffold(
      // backgroundColor: primary,
      body: Container(
        decoration: AppDecoration.blueGradient,
        child: SafeArea(
        child: Center(
          child: SingleChildScrollView(
            padding: const EdgeInsets.symmetric(horizontal: 20, vertical: 18),
            child: ConstrainedBox(
              constraints: BoxConstraints(maxWidth: width < 720 ? width : 720),
              child: Column(
                crossAxisAlignment: CrossAxisAlignment.stretch,
                children: [
                  const SizedBox(height: 6),
                  const Text('Welcome', style: TextStyle(fontSize: 34, fontWeight: FontWeight.bold, color: Colors.white)),
                  const SizedBox(height: 6),
                  const Text('Sign in to continue', style: TextStyle(color: Colors.white70, fontSize: 16)),
                  const SizedBox(height: 26),

                  // HERO card
                  Hero(
                    tag: 'headerCard',
                    flightShuttleBuilder: (flightContext, animation, flightDirection, fromContext, toContext) {
                      return Material(
                        color: Colors.transparent,
                        child: ScaleTransition(
                          scale: animation.drive(Tween(begin: 0.98, end: 1.0).chain(CurveTween(curve: Curves.easeOut))),
                          child: fromContext.widget,
                        ),
                      );
                    },
                    child: Material(
                      type: MaterialType.transparency,
                      child: Container(
                        width: double.infinity,
                        decoration: AppDecoration.blueGradientRounded(20).copyWith(
                          boxShadow: const [BoxShadow(color: Colors.black26, blurRadius: 18, offset: Offset(0, 8))],
                        ),
                        padding: const EdgeInsets.fromLTRB(18, 18, 18, 18),
                        child: Column(
                          crossAxisAlignment: CrossAxisAlignment.center,
                          children: [
                            const SizedBox(height: 8),
                            const Text('Eventify', style: TextStyle(color: Colors.white, fontSize: 22, fontWeight: FontWeight.bold)),
                            const SizedBox(height: 12),

                            // white card inside the blue card — now uses Form
                            Form(
                              key: _formKey,
                              child: Container(
                                decoration: BoxDecoration(color: Colors.white, borderRadius: BorderRadius.circular(12)),
                                padding: const EdgeInsets.symmetric(horizontal: 12, vertical: 14),
                                child: Column(
                                  children: [
                                    // Email
                                    TextFormField(
                                      controller: _emailCtrl,
                                      focusNode: _emailFocus,
                                      keyboardType: TextInputType.emailAddress,
                                      autofillHints: const [AutofillHints.email],
                                      decoration: InputDecoration(
                                        labelText: 'Email',
                                        border: InputBorder.none,
                                        prefixIcon: Icon(Icons.email, color: primary),
                                      ),
                                      validator: _emailValidator,
                                      textInputAction: TextInputAction.next,
                                      onFieldSubmitted: (_) {
                                        FocusScope.of(context).requestFocus(_passFocus);
                                      },
                                    ),
                                    const Divider(),
                                    // Password
                                    TextFormField(
                                      controller: _passCtrl,
                                      focusNode: _passFocus,
                                      obscureText: true,
                                      decoration: InputDecoration(
                                        labelText: 'Password',
                                        border: InputBorder.none,
                                        prefixIcon: Icon(Icons.lock, color: primary),
                                      ),
                                      validator: _passwordValidator,
                                      textInputAction: TextInputAction.done,
                                      onFieldSubmitted: (_) => _performLogin(),
                                    ),
                                  ],
                                ),
                              ),
                            ),

                            const SizedBox(height: 18),

                            // Login button
                            SizedBox(
                              width: double.infinity,
                              child: ElevatedButton(
                                onPressed: _loading ? null : _performLogin,
                                style: ElevatedButton.styleFrom(
                                  backgroundColor: Colors.white,
                                  foregroundColor: primary,
                                  padding: const EdgeInsets.symmetric(vertical: 14),
                                  shape: RoundedRectangleBorder(borderRadius: BorderRadius.circular(10)),
                                ),
                                child: _loading
                                    ? SizedBox(height: 18, width: 18, child: CircularProgressIndicator(strokeWidth: 2, color: primary))
                                    : const Text('Login', style: TextStyle(fontSize: 16, fontWeight: FontWeight.w600)),
                              ),
                            ),

                            const SizedBox(height: 8),
                          ],
                        ),
                      ),
                    ),
                  ),

                  const SizedBox(height: 18),
                  Center(
                    child: Column(
                      children: [
                        const SizedBox(height: 8),
                        TextButton(
                          onPressed: _openRegister,
                          child: const Text("Don't have an account? Register", style: TextStyle(color: Colors.white)),
                        ),
                      ],
                    ),
                  ),
                ],
              ),
            ),
          ),
        ),
      ),
    ),
  );
}
}

/// Register screen calls backend register endpoint via AuthService.register
class RegisterScreen extends StatefulWidget {
  final bool isDesktop;
  const RegisterScreen({Key? key, this.isDesktop = false}) : super(key: key);

  @override
  State<RegisterScreen> createState() => _RegisterScreenState();
}

class _RegisterScreenState extends State<RegisterScreen> {
  final _formKey = GlobalKey<FormState>();
  final TextEditingController _emailCtrl = TextEditingController();
  final TextEditingController _phoneCtrl = TextEditingController();
  final TextEditingController _passCtrl = TextEditingController();
  final TextEditingController _confirmCtrl = TextEditingController();
  final AuthService _auth = AuthService();

  bool _loading = false;

  @override
  void dispose() {
    _emailCtrl.dispose();
    _phoneCtrl.dispose();
    _passCtrl.dispose();
    _confirmCtrl.dispose();
    super.dispose();
  }

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

    final email = _emailCtrl.text.trim();
    final phone = _phoneCtrl.text.trim();
    final pass = _passCtrl.text;
    final confirm = _confirmCtrl.text;

    if (pass != confirm) {
      ScaffoldMessenger.of(context).showSnackBar(const SnackBar(content: Text('Passwords do not match')));
      return;
    }

    setState(() => _loading = true);

    try {
      await _auth.register(
        email: email,
        phoneNumber: phone,
        password: pass,
      );

      if (!mounted) return;

      Navigator.of(context).pushReplacement(MaterialPageRoute(builder: (_) => const HomeScreen()));
    } catch (e) {
      if (!mounted) return;
      final message = e.toString().replaceAll('Exception: ', '');
      ScaffoldMessenger.of(context).showSnackBar(SnackBar(content: Text(message)));
    } finally {
      if (mounted) setState(() => _loading = false);
    }
  }

  String? _emailValidator(String? v) {
    if (v == null || v.trim().isEmpty) return 'Enter email';
    final emailRegex = RegExp(r"^[^@]+@[^@]+\.[^@]+");
    if (!emailRegex.hasMatch(v.trim())) return 'Enter a valid email';
    return null;
  }

  String? _phoneValidator(String? v) {
    if (v == null || v.trim().isEmpty) return 'Enter phone number';
    if (v.trim().length < 7) return 'Enter a valid phone number';
    return null;
  }

  String? _passwordValidator(String? v) {
    if (v == null || v.isEmpty) return 'Enter password';
    if (v.length < 6) return 'Password must be at least 6 characters';
    return null;
  }

  @override
  Widget build(BuildContext context) {
    return Scaffold(
      appBar: AppBar(title: const Text('Register')),
      body: SafeArea(
        child: Center(
          child: SingleChildScrollView(
            padding: const EdgeInsets.all(20),
            child: ConstrainedBox(
              constraints: const BoxConstraints(maxWidth: 520),
              child: Card(
                child: Padding(
                  padding: const EdgeInsets.all(18.0),
                  child: Form(
                    key: _formKey,
                    child: Column(
                      children: [
                        TextFormField(controller: _emailCtrl, decoration: const InputDecoration(labelText: 'Email'), validator: _emailValidator, keyboardType: TextInputType.emailAddress),
                        const SizedBox(height: 8),
                        TextFormField(controller: _phoneCtrl, decoration: const InputDecoration(labelText: 'Phone'), validator: _phoneValidator, keyboardType: TextInputType.phone),
                        const SizedBox(height: 8),
                        TextFormField(controller: _passCtrl, obscureText: true, decoration: const InputDecoration(labelText: 'Password'), validator: _passwordValidator),
                        const SizedBox(height: 8),
                        TextFormField(controller: _confirmCtrl, obscureText: true, decoration: const InputDecoration(labelText: 'Confirm password'), validator: _passwordValidator),
                        const SizedBox(height: 16),
                        SizedBox(
                          width: double.infinity,
                          child: ElevatedButton(
                            onPressed: _loading ? null : _performRegister,
                            child: _loading ? const SizedBox(width: 20, height: 20, child: CircularProgressIndicator(color: Colors.white, strokeWidth: 2)) : const Text('Register'),
                          ),
                        ),
                      ],
                    ),
                  ),
                ),
              ),
            ),
          ),
        ),
      ),
    );
  }
}