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

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

  @override
  State<ChangePasswordScreen> createState() => _ChangePasswordScreenState();
}

class _ChangePasswordScreenState extends State<ChangePasswordScreen> {
  final _passLamaController   = TextEditingController();
  final _passBaruController   = TextEditingController();
  final _konfirmasiController = TextEditingController();

  bool _isLoading         = false;
  bool _obscurePassLama   = true;
  bool _obscurePassBaru   = true;
  bool _obscureKonfirmasi = true;

  // Deteksi apakah datang dari deep link reset password
  // Kalau dari deep link, tidak perlu password lama
  bool _dariResetLink = false;

  @override
  void didChangeDependencies() {
    super.didChangeDependencies();
    final args = ModalRoute.of(context)?.settings.arguments;
    if (args is Map && args['dari_reset'] == true) {
      _dariResetLink = true;
    }
  }

  @override
  void dispose() {
    _passLamaController.dispose();
    _passBaruController.dispose();
    _konfirmasiController.dispose();
    super.dispose();
  }

  Future<void> _handleGantiPassword() async {
    final passLama   = _passLamaController.text.trim();
    final passBaru   = _passBaruController.text.trim();
    final konfirmasi = _konfirmasiController.text.trim();

    // Validasi
    if (!_dariResetLink && passLama.isEmpty) {
      _showSnackBar('Password lama harus diisi!', isError: true);
      return;
    }
    if (passBaru.isEmpty || konfirmasi.isEmpty) {
      _showSnackBar('Password baru dan konfirmasi harus diisi!', isError: true);
      return;
    }
    if (passBaru.length < 6) {
      _showSnackBar('Password baru minimal 6 karakter!', isError: true);
      return;
    }
    if (passBaru != konfirmasi) {
      _showSnackBar('Konfirmasi password tidak cocok!', isError: true);
      return;
    }
    if (!_dariResetLink && passLama == passBaru) {
      _showSnackBar('Password baru tidak boleh sama dengan password lama!',
          isError: true);
      return;
    }

    setState(() => _isLoading = true);

    try {
      if (!_dariResetLink) {
        // Dari settings — verifikasi password lama dulu
        final user = SupabaseService().currentUser;
        if (user == null) throw Exception('User tidak ditemukan');
        await SupabaseService().signIn(user.email!, passLama);
      }

      // Update password baru
      await SupabaseService().updatePassword(passBaru);

      if (mounted) {
        _showSnackBar('Password berhasil diubah!', isError: false);
        Future.delayed(const Duration(milliseconds: 1500), () {
          if (mounted) {
            if (_dariResetLink) {
              // Dari reset link → ke login
              Navigator.pushReplacementNamed(context, '/login');
            } else {
              // Dari settings → kembali
              Navigator.pop(context);
            }
          }
        });
      }
    } catch (e) {
      if (mounted) {
        final errorStr = e.toString().toLowerCase();
        String pesan = 'Gagal mengubah password, coba lagi.';
        if (errorStr.contains('invalid_credentials') ||
            errorStr.contains('invalid login credentials')) {
          pesan = 'Password lama salah!';
        } 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.black,
        leading: IconButton(
          icon: const Icon(Icons.arrow_back, color: Colors.white),
          onPressed: () => _dariResetLink
              ? Navigator.pushReplacementNamed(context, '/login')
              : Navigator.pop(context),
        ),
        title: Text(
          _dariResetLink ? 'Reset Password' : 'Ganti Password',
          style: const TextStyle(
              color: Colors.white,
              fontSize: 20,
              fontWeight: FontWeight.bold),
        ),
      ),
      body: SafeArea(
        child: SingleChildScrollView(
          padding: const EdgeInsets.all(20),
          child: Column(
            crossAxisAlignment: CrossAxisAlignment.start,
            children: [
              Text(
                _dariResetLink
                    ? 'Masukkan password baru untuk akun kamu.'
                    : 'Ubah password akun kamu.\nPastikan password baru minimal 6 karakter.',
                style: const TextStyle(color: Colors.grey, fontSize: 14),
              ),
              const SizedBox(height: 30),

              Container(
                padding: const EdgeInsets.all(20),
                decoration: BoxDecoration(
                  color: const Color(0xFF1A1A1A),
                  borderRadius: BorderRadius.circular(20),
                  border: Border.all(color: Colors.grey.withOpacity(0.3)),
                ),
                child: Column(
                  children: [
                    // Field password lama — hanya tampil kalau bukan dari reset link
                    if (!_dariResetLink) ...[
                      _buildPasswordField(
                        controller: _passLamaController,
                        label: 'Password Lama',
                        obscure: _obscurePassLama,
                        onToggle: () => setState(
                            () => _obscurePassLama = !_obscurePassLama),
                      ),
                      const Divider(color: Colors.grey),
                    ],

                    _buildPasswordField(
                      controller: _passBaruController,
                      label: 'Password Baru',
                      obscure: _obscurePassBaru,
                      onToggle: () => setState(
                          () => _obscurePassBaru = !_obscurePassBaru),
                    ),
                    const Divider(color: Colors.grey),

                    _buildPasswordField(
                      controller: _konfirmasiController,
                      label: 'Konfirmasi Password Baru',
                      obscure: _obscureKonfirmasi,
                      onToggle: () => setState(
                          () => _obscureKonfirmasi = !_obscureKonfirmasi),
                    ),
                  ],
                ),
              ),

              const SizedBox(height: 30),

              SizedBox(
                width: double.infinity,
                height: 55,
                child: ElevatedButton(
                  onPressed: _isLoading ? null : _handleGantiPassword,
                  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(
                          'Simpan Password Baru',
                          style: TextStyle(
                              fontSize: 16,
                              fontWeight: FontWeight.bold,
                              color: Colors.white),
                        ),
                ),
              ),
            ],
          ),
        ),
      ),
    );
  }

  Widget _buildPasswordField({
    required TextEditingController controller,
    required String label,
    required bool obscure,
    required VoidCallback onToggle,
  }) {
    return TextField(
      controller: controller,
      obscureText: obscure,
      style: const TextStyle(color: Colors.white),
      decoration: InputDecoration(
        prefixIcon: const Icon(Icons.lock, color: Colors.green),
        suffixIcon: IconButton(
          icon: Icon(obscure ? Icons.visibility : Icons.visibility_off,
              color: Colors.grey),
          onPressed: onToggle,
        ),
        hintText: label,
        hintStyle: const TextStyle(color: Colors.grey),
        border: InputBorder.none,
      ),
    );
  }
}