import 'package:flutter/material.dart';
import 'package:flutter_spinkit/flutter_spinkit.dart';
import 'login.dart';
import 'services/auth_service.dart';

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

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

class _RegisterScreenState extends State<RegisterScreen> {
  final _formKey = GlobalKey<FormState>();
  final _nameController = TextEditingController();
  final _emailController = TextEditingController();
  final _passwordController = TextEditingController();
  final _confirmPasswordController = TextEditingController();
  bool _obscurePassword = true;
  bool _obscureConfirmPassword = true;
  bool _isLoading = false;
  final _authService = AuthService();

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

  @override
  Widget build(BuildContext context) {
    return Scaffold(
      backgroundColor: Colors.white,
      body: Column(
        children: [
          // Header
          Container(
            width: double.infinity,
            padding: const EdgeInsets.fromLTRB(8, 0, 16, 24),
            decoration: const BoxDecoration(
              gradient: LinearGradient(
                begin: Alignment.topLeft,
                end: Alignment.bottomRight,
                colors: [Color(0xFF1565C0), Color(0xFF0D47A1)],
              ),
              borderRadius: BorderRadius.only(
                bottomLeft: Radius.circular(28),
                bottomRight: Radius.circular(28),
              ),
            ),
            child: SafeArea(
              bottom: false,
              child: Column(
                children: [
                  Align(
                    alignment: Alignment.centerLeft,
                    child: IconButton(
                      icon: const Icon(
                        Icons.arrow_back_rounded,
                        color: Colors.white,
                      ),
                      onPressed: () => Navigator.pop(context),
                    ),
                  ),
                  Container(
                    padding: const EdgeInsets.all(18),
                    decoration: BoxDecoration(
                      color: Colors.white,
                      shape: BoxShape.circle,
                      boxShadow: [
                        BoxShadow(
                          color: Colors.black.withOpacity(0.1),
                          blurRadius: 20,
                          offset: const Offset(0, 6),
                        ),
                      ],
                    ),
                    child: const Icon(
                      Icons.person_add_rounded,
                      color: Color(0xFF1565C0),
                      size: 36,
                    ),
                  ),
                  const SizedBox(height: 16),
                  const Text(
                    'Buat Akun Baru',
                    style: TextStyle(
                      fontSize: 22,
                      fontWeight: FontWeight.w700,
                      color: Colors.white,
                      letterSpacing: 0.3,
                    ),
                  ),
                  const SizedBox(height: 4),
                  Text(
                    'Daftar untuk mulai menggunakan aplikasi',
                    style: TextStyle(
                      fontSize: 13,
                      color: Colors.white.withOpacity(0.8),
                    ),
                  ),
                ],
              ),
            ),
          ),

          // Form
          Expanded(
            child: SingleChildScrollView(
              padding: const EdgeInsets.fromLTRB(24, 28, 24, 24),
              child: Form(
                key: _formKey,
                child: Column(
                  crossAxisAlignment: CrossAxisAlignment.start,
                  children: [
                    _buildTextField(
                      label: 'Nama',
                      controller: _nameController,
                      prefixIcon: Icons.person_outline,
                      validator: (v) {
                        if (v == null || v.trim().isEmpty)
                          return 'Nama tidak boleh kosong';
                        return null;
                      },
                    ),
                    const SizedBox(height: 18),
                    _buildTextField(
                      label: 'Email',
                      controller: _emailController,
                      keyboardType: TextInputType.emailAddress,
                      prefixIcon: Icons.email_outlined,
                      validator: (v) {
                        if (v == null || v.trim().isEmpty)
                          return 'Email tidak boleh kosong';
                        if (!v.contains('@')) return 'Email tidak valid';
                        return null;
                      },
                    ),
                    const SizedBox(height: 18),
                    _buildTextField(
                      label: 'Password',
                      controller: _passwordController,
                      obscureText: _obscurePassword,
                      prefixIcon: Icons.lock_outline,
                      suffixIcon: IconButton(
                        icon: Icon(
                          _obscurePassword
                              ? Icons.visibility_outlined
                              : Icons.visibility_off_outlined,
                          color: const Color(0xFF1565C0),
                        ),
                        onPressed: () => setState(
                          () => _obscurePassword = !_obscurePassword,
                        ),
                      ),
                      validator: (v) {
                        if (v == null || v.isEmpty)
                          return 'Password tidak boleh kosong';
                        if (v.length < 6) return 'Password minimal 6 karakter';
                        return null;
                      },
                    ),
                    const SizedBox(height: 18),
                    _buildTextField(
                      label: 'Konfirmasi Password',
                      controller: _confirmPasswordController,
                      obscureText: _obscureConfirmPassword,
                      prefixIcon: Icons.lock_outline,
                      suffixIcon: IconButton(
                        icon: Icon(
                          _obscureConfirmPassword
                              ? Icons.visibility_outlined
                              : Icons.visibility_off_outlined,
                          color: const Color(0xFF1565C0),
                        ),
                        onPressed: () => setState(
                          () => _obscureConfirmPassword =
                              !_obscureConfirmPassword,
                        ),
                      ),
                      validator: (v) {
                        if (v != _passwordController.text)
                          return 'Password tidak cocok';
                        return null;
                      },
                    ),
                    const SizedBox(height: 28),

                    // Tombol Daftar
                    SizedBox(
                      width: double.infinity,
                      child: _buildActionButton(
                        label: 'DAFTAR',
                        onPressed: _isLoading ? null : _handleRegister,
                      ),
                    ),

                    const SizedBox(height: 24),

                    // Info card
                    _buildInfoCard(),

                    const SizedBox(height: 20),

                    // Link ke login
                    Row(
                      mainAxisAlignment: MainAxisAlignment.center,
                      children: [
                        Text(
                          'Sudah punya akun? ',
                          style: TextStyle(
                            fontSize: 14,
                            color: Colors.grey[600],
                          ),
                        ),
                        GestureDetector(
                          onTap: () => Navigator.pushReplacement(
                            context,
                            MaterialPageRoute(
                              builder: (_) => const LoginScreen(),
                            ),
                          ),
                          child: const Text(
                            'Masuk',
                            style: TextStyle(
                              fontSize: 14,
                              fontWeight: FontWeight.w700,
                              color: Color(0xFF1565C0),
                            ),
                          ),
                        ),
                      ],
                    ),
                    const SizedBox(height: 20),
                  ],
                ),
              ),
            ),
          ),
        ],
      ),
    );
  }

  Widget _buildTextField({
    required String label,
    required TextEditingController controller,
    TextInputType? keyboardType,
    bool obscureText = false,
    IconData? prefixIcon,
    Widget? suffixIcon,
    String? Function(String?)? validator,
  }) {
    return Column(
      crossAxisAlignment: CrossAxisAlignment.start,
      children: [
        Text(
          label,
          style: const TextStyle(
            fontSize: 14,
            fontWeight: FontWeight.w600,
            color: Color(0xFF1A1A2E),
          ),
        ),
        const SizedBox(height: 8),
        TextFormField(
          controller: controller,
          keyboardType: keyboardType,
          obscureText: obscureText,
          validator: validator,
          decoration: InputDecoration(
            prefixIcon: prefixIcon != null
                ? Icon(prefixIcon, color: const Color(0xFF1565C0), size: 20)
                : null,
            suffixIcon: suffixIcon,
            filled: true,
            fillColor: const Color(0xFFF7F8FC),
            border: OutlineInputBorder(
              borderRadius: BorderRadius.circular(14),
              borderSide: const BorderSide(color: Color(0xFFE0E0E0)),
            ),
            enabledBorder: OutlineInputBorder(
              borderRadius: BorderRadius.circular(14),
              borderSide: const BorderSide(color: Color(0xFFE0E0E0)),
            ),
            focusedBorder: OutlineInputBorder(
              borderRadius: BorderRadius.circular(14),
              borderSide: const BorderSide(
                color: Color(0xFF1565C0),
                width: 1.5,
              ),
            ),
            errorBorder: OutlineInputBorder(
              borderRadius: BorderRadius.circular(14),
              borderSide: const BorderSide(color: Color(0xFFEF5350)),
            ),
            focusedErrorBorder: OutlineInputBorder(
              borderRadius: BorderRadius.circular(14),
              borderSide: const BorderSide(
                color: Color(0xFFEF5350),
                width: 1.5,
              ),
            ),
            contentPadding: const EdgeInsets.symmetric(
              horizontal: 16,
              vertical: 15,
            ),
          ),
        ),
      ],
    );
  }

  Widget _buildActionButton({
    required String label,
    required VoidCallback? onPressed,
  }) {
    return ElevatedButton(
      onPressed: onPressed,
      style: ElevatedButton.styleFrom(
        backgroundColor: const Color(0xFF1565C0),
        foregroundColor: Colors.white,
        padding: const EdgeInsets.symmetric(vertical: 16),
        shape: RoundedRectangleBorder(borderRadius: BorderRadius.circular(14)),
        elevation: 0,
        disabledBackgroundColor: Colors.grey[300],
        shadowColor: const Color(0xFF1565C0).withOpacity(0.3),
      ),
      child: _isLoading
          ? const SpinKitThreeBounce(color: Colors.white, size: 20)
          : Text(
              label,
              style: const TextStyle(
                fontSize: 16,
                fontWeight: FontWeight.w700,
                letterSpacing: 0.5,
              ),
            ),
    );
  }

  Widget _buildInfoCard() {
    return Container(
      padding: const EdgeInsets.all(18),
      decoration: BoxDecoration(
        color: const Color(0xFFF7F8FC),
        borderRadius: BorderRadius.circular(16),
        border: Border.all(color: const Color(0xFFE0E0E0)),
      ),
      child: Column(
        crossAxisAlignment: CrossAxisAlignment.start,
        children: [
          Row(
            children: [
              Container(
                padding: const EdgeInsets.all(10),
                decoration: BoxDecoration(
                  color: const Color(0xFF1565C0).withOpacity(0.08),
                  borderRadius: BorderRadius.circular(12),
                ),
                child: const Icon(
                  Icons.school_rounded,
                  color: Color(0xFF1565C0),
                  size: 22,
                ),
              ),
              const SizedBox(width: 12),
              const Expanded(
                child: Column(
                  crossAxisAlignment: CrossAxisAlignment.start,
                  children: [
                    Text(
                      'Untuk Mahasiswa',
                      style: TextStyle(
                        fontSize: 15,
                        fontWeight: FontWeight.w700,
                        color: Color(0xFF1A1A2E),
                      ),
                    ),
                    Text(
                      'Politeknik Negeri Jember',
                      style: TextStyle(
                        fontSize: 13,
                        fontWeight: FontWeight.w500,
                        color: Color(0xFF1565C0),
                      ),
                    ),
                  ],
                ),
              ),
            ],
          ),
          const SizedBox(height: 16),
          _buildInfoItem(
            Icons.home_rounded,
            'Temukan Kontrakan Terbaik',
            'Rekomendasi kontrakan terdekat dari kampus',
          ),
          const SizedBox(height: 10),
          _buildInfoItem(
            Icons.local_laundry_service_rounded,
            'Cari Laundry Terpercaya',
            'Temukan laundry dengan kualitas terbaik',
          ),
          const SizedBox(height: 10),
          _buildInfoItem(
            Icons.analytics_rounded,
            'Metode SAW',
            'Rekomendasi berdasarkan preferensi Anda',
          ),
        ],
      ),
    );
  }

  Widget _buildInfoItem(IconData icon, String title, String description) {
    return Row(
      crossAxisAlignment: CrossAxisAlignment.start,
      children: [
        Icon(icon, color: const Color(0xFF1565C0).withOpacity(0.6), size: 18),
        const SizedBox(width: 10),
        Expanded(
          child: Column(
            crossAxisAlignment: CrossAxisAlignment.start,
            children: [
              Text(
                title,
                style: const TextStyle(
                  fontSize: 13,
                  fontWeight: FontWeight.w600,
                  color: Color(0xFF1A1A2E),
                ),
              ),
              const SizedBox(height: 2),
              Text(
                description,
                style: TextStyle(
                  fontSize: 12,
                  color: Colors.grey[500],
                  height: 1.3,
                ),
              ),
            ],
          ),
        ),
      ],
    );
  }

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

    setState(() => _isLoading = true);

    try {
      final result = await _authService.register(
        name: _nameController.text.trim(),
        email: _emailController.text.trim(),
        password: _passwordController.text,
        passwordConfirmation: _confirmPasswordController.text,
        phone: '', // Send empty phone field
      );

      if (!mounted) return;

      // Better error handling with null safety
      final success = result['success'] ?? false;

      if (success == true) {
        // Success - show message dan navigate
        if (mounted) {
          ScaffoldMessenger.of(context).showSnackBar(
            SnackBar(
              content: const Row(
                children: [
                  Icon(
                    Icons.check_circle_rounded,
                    color: Colors.white,
                    size: 20,
                  ),
                  SizedBox(width: 10),
                  Text('Registrasi berhasil! Silakan login.'),
                ],
              ),
              backgroundColor: const Color(0xFF2E7D32),
              behavior: SnackBarBehavior.floating,
              shape: RoundedRectangleBorder(
                borderRadius: BorderRadius.circular(12),
              ),
              margin: const EdgeInsets.all(16),
              duration: const Duration(seconds: 2),
            ),
          );
        }

        await Future.delayed(const Duration(seconds: 1));
        if (mounted) {
          Navigator.pushReplacement(
            context,
            MaterialPageRoute(
              builder: (_) => LoginScreen(initialEmail: _emailController.text),
            ),
          );
        }
      } else {
        // Error handling
        debugPrint('Register failed result: $result');
        final status = result['status'];
        final serverMessage = result['message']?.toString().trim();
        final errors = result['errors'];

        // Extract first error message
        String? errorMessage;

        if (errors is Map && errors.isNotEmpty) {
          final firstError = errors.values.first;
          if (firstError is List && firstError.isNotEmpty) {
            errorMessage = firstError.first.toString();
          } else {
            errorMessage = firstError.toString();
          }
        } else if (errors is List && errors.isNotEmpty) {
          errorMessage = errors.first.toString();
        }

        // Fallback to server message
        if ((errorMessage == null || errorMessage.isEmpty) &&
            (serverMessage != null && serverMessage.isNotEmpty)) {
          errorMessage = serverMessage;
        }

        // Final fallback
        if (errorMessage == null || errorMessage.isEmpty) {
          errorMessage = status != null
              ? 'Registrasi gagal (HTTP $status)'
              : 'Registrasi gagal. Coba lagi.';
        }

        if (mounted) {
          ScaffoldMessenger.of(context).showSnackBar(
            SnackBar(
              content: Row(
                children: [
                  const Icon(
                    Icons.error_outline_rounded,
                    color: Colors.white,
                    size: 20,
                  ),
                  const SizedBox(width: 10),
                  Expanded(child: Text(errorMessage)),
                ],
              ),
              backgroundColor: const Color(0xFFC62828),
              behavior: SnackBarBehavior.floating,
              shape: RoundedRectangleBorder(
                borderRadius: BorderRadius.circular(12),
              ),
              margin: const EdgeInsets.all(16),
              duration: const Duration(seconds: 3),
            ),
          );
        }
      }
    } catch (e, stackTrace) {
      if (mounted) {
        debugPrint('Register exception: $e\n$stackTrace');

        ScaffoldMessenger.of(context).showSnackBar(
          SnackBar(
            content: Text('Terjadi kesalahan: $e'),
            backgroundColor: const Color(0xFFC62828),
            duration: const Duration(seconds: 3),
          ),
        );
      }
    } finally {
      if (mounted) setState(() => _isLoading = false);
    }
  }
}