import 'package:flutter/material.dart';
import '../services/supabase_service.dart';

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

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

class _RegisterScreenState extends State<RegisterScreen> {
  final _nameController     = TextEditingController();
  final _emailController    = TextEditingController();
  final _passwordController = TextEditingController();
  bool _isLoading       = false;
  bool _obscurePassword = true;

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

  Future<void> _handleRegister() async {
    final nama     = _nameController.text.trim();
    final email    = _emailController.text.trim();
    final password = _passwordController.text.trim();

    // ── Validasi kosong ──
    if (nama.isEmpty || email.isEmpty || password.isEmpty) {
      _showSnackBar('Semua field harus diisi!', isError: true);
      return;
    }

    // ── Validasi format email ──
    if (!email.contains('@') || !email.contains('.')) {
      _showSnackBar('Format email tidak valid!', isError: true);
      return;
    }

    // ── Validasi panjang password ──
    if (password.length < 6) {
      _showSnackBar('Password minimal 6 karakter!', isError: true);
      return;
    }

    setState(() => _isLoading = true);
    try {
      await SupabaseService().signUp(email, password, nama);
      if (mounted) {
        _showSnackBar('Akun berhasil dibuat! Silakan login.', isError: false);
        Future.delayed(const Duration(milliseconds: 1500), () {
          if (mounted) Navigator.pop(context);
        });
      }
    } catch (e) {
      if (mounted) {
        final errorStr = e.toString().toLowerCase();
        String pesan = 'Pendaftaran gagal, coba lagi.';

        if (errorStr.contains('user_already_exists') ||
            errorStr.contains('already registered') ||
            errorStr.contains('already been registered')) {
          pesan = 'Email sudah terdaftar, silakan login.';
        } else if (errorStr.contains('invalid') &&
                   errorStr.contains('email')) {
          pesan = 'Format email tidak valid!';
        } else if (errorStr.contains('password') &&
                   errorStr.contains('weak')) {
          pesan = 'Password terlalu lemah, gunakan kombinasi huruf dan angka.';
        } else if (errorStr.contains('network') ||
                   errorStr.contains('socket')) {
          pesan = 'Tidak ada koneksi internet.';
        }

        _showSnackBar(pesan, isError: true);
      }
    } finally {
      if (mounted) setState(() => _isLoading = false);
    }
  }

  void _showSnackBar(String pesan, {required bool isError}) {
    ScaffoldMessenger.of(context).showSnackBar(
      SnackBar(
        content: Row(
          children: [
            Icon(
              isError ? Icons.error_outline : Icons.check_circle_outline,
              color: Colors.white,
            ),
            const SizedBox(width: 10),
            Expanded(
              child: Text(
                pesan,
                style: const TextStyle(
                    color: Colors.white, fontWeight: FontWeight.bold),
              ),
            ),
          ],
        ),
        backgroundColor:
            isError ? Colors.red.shade700 : Colors.green.shade700,
        behavior: SnackBarBehavior.floating,
        shape: RoundedRectangleBorder(
          borderRadius: BorderRadius.circular(12),
        ),
        margin: const EdgeInsets.all(16),
        duration: const Duration(seconds: 3),
      ),
    );
  }

  @override
  Widget build(BuildContext context) {
    return Scaffold(
      backgroundColor: Colors.black,
      appBar: AppBar(
        backgroundColor: Colors.transparent,
        elevation: 0,
        leading: IconButton(
          icon: const Icon(Icons.arrow_back, color: Colors.green),
          onPressed: () => Navigator.pop(context),
        ),
      ),
      body: SingleChildScrollView(
        child: Padding(
          padding: const EdgeInsets.symmetric(horizontal: 30.0),
          child: Column(
            crossAxisAlignment: CrossAxisAlignment.start,
            children: [
              const Text(
                'Buat Akun Baru',
                style: TextStyle(
                    color: Colors.green,
                    fontSize: 32,
                    fontWeight: FontWeight.bold),
              ),
              const Text(
                'Lengkapi data diri Anda untuk memulai',
                style: TextStyle(color: Colors.grey, fontSize: 16),
              ),
              const SizedBox(height: 50),
              Container(
                padding: const EdgeInsets.all(20),
                decoration: BoxDecoration(
                  color: const Color(0xFF1A1A1A),
                  borderRadius: BorderRadius.circular(25),
                  border:
                      Border.all(color: Colors.grey.withOpacity(0.3)),
                ),
                child: Column(
                  children: [
                    // Nama Lengkap
                    TextField(
                      controller: _nameController,
                      style: const TextStyle(color: Colors.white),
                      textCapitalization: TextCapitalization.words,
                      decoration: const InputDecoration(
                        prefixIcon:
                            Icon(Icons.person, color: Colors.green),
                        hintText: 'Nama Lengkap',
                        hintStyle: TextStyle(color: Colors.grey),
                        border: InputBorder.none,
                      ),
                    ),
                    const Divider(color: Colors.grey),

                    // Email
                    TextField(
                      controller: _emailController,
                      keyboardType: TextInputType.emailAddress,
                      style: const TextStyle(color: Colors.white),
                      decoration: const InputDecoration(
                        prefixIcon:
                            Icon(Icons.email, color: Colors.green),
                        hintText: 'Email',
                        hintStyle: TextStyle(color: Colors.grey),
                        border: InputBorder.none,
                      ),
                    ),
                    const Divider(color: Colors.grey),

                    // Password
                    TextField(
                      controller: _passwordController,
                      obscureText: _obscurePassword,
                      style: const TextStyle(color: Colors.white),
                      decoration: InputDecoration(
                        prefixIcon:
                            const Icon(Icons.lock, color: Colors.green),
                        suffixIcon: IconButton(
                          icon: Icon(
                            _obscurePassword
                                ? Icons.visibility
                                : Icons.visibility_off,
                            color: Colors.grey,
                          ),
                          onPressed: () => setState(
                              () => _obscurePassword = !_obscurePassword),
                        ),
                        hintText: 'Password (min. 6 karakter)',
                        hintStyle: const TextStyle(color: Colors.grey),
                        border: InputBorder.none,
                      ),
                    ),
                    const SizedBox(height: 30),

                    // Tombol Daftar
                    SizedBox(
                      width: double.infinity,
                      height: 55,
                      child: ElevatedButton(
                        onPressed: _isLoading ? null : _handleRegister,
                        style: ElevatedButton.styleFrom(
                          backgroundColor: Colors.green,
                          disabledBackgroundColor:
                              Colors.green.withOpacity(0.3),
                          shape: RoundedRectangleBorder(
                            borderRadius: BorderRadius.circular(15),
                          ),
                        ),
                        child: _isLoading
                            ? const CircularProgressIndicator(
                                color: Colors.white)
                            : const Text(
                                'Daftar Sekarang',
                                style: TextStyle(
                                    fontSize: 18,
                                    fontWeight: FontWeight.bold,
                                    color: Colors.white),
                              ),
                      ),
                    ),
                  ],
                ),
              ),
              const SizedBox(height: 30),
              Center(
                child: TextButton(
                  onPressed: () => Navigator.pop(context),
                  child: const Text(
                    'Sudah punya akun? Masuk',
                    style: TextStyle(color: Colors.green),
                  ),
                ),
              ),
            ],
          ),
        ),
      ),
    );
  }
}