// lib/screens/config_screen.dart

import 'package:flutter/material.dart';
import 'package:shared_preferences/shared_preferences.dart';
import 'package:cashumit/widgets/custom_text_config_dialog.dart';
import 'package:cashumit/services/firefly_api_service.dart';
import 'package:bluetooth_print/bluetooth_print.dart';
import 'package:bluetooth_print/bluetooth_print_model.dart';

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

  @override
  State<ConfigScreen> createState() => _ConfigScreenState();
}

class _ConfigScreenState extends State<ConfigScreen> {
  final _formKey = GlobalKey<FormState>();
  final _urlController = TextEditingController();
  final _tokenController = TextEditingController();
  bool _isTestingConnection = false;
  bool _isTestingAuth = false;

  // Bluetooth printer variables
  BluetoothPrint bluetoothPrint = BluetoothPrint.instance;
  bool _isScanning = false;
  List<BluetoothDevice> _devices = [];
  BluetoothDevice? _selectedDevice;
  bool _connected = false;

  static const String _prefsKeyUrl = 'firefly_url';
  static const String _prefsKeyToken = 'firefly_token';

  @override
  void initState() {
    super.initState();
    _loadConfig();
    _initBluetooth();
  }

  /// Memuat konfigurasi yang tersimpan dari shared preferences.
  ///
  /// Metode ini dipanggil saat ConfigScreen pertama kali dibuat (initState)
  /// untuk mengisi field input dengan konfigurasi yang telah disimpan sebelumnya.
  Future<void> _loadConfig() async {
    final prefs = await SharedPreferences.getInstance();
    final savedUrl = prefs.getString(_prefsKeyUrl) ?? '';
    final savedToken = prefs.getString(_prefsKeyToken) ?? '';

    setState(() {
      _urlController.text = savedUrl;
      _tokenController.text = savedToken;
    });
  }

  /// Inisialisasi Bluetooth printer
  Future<void> _initBluetooth() async {
    // Periksa status koneksi
    final isConnected = await bluetoothPrint.isConnected ?? false;
    if (mounted) {
      setState(() {
        _connected = isConnected;
      });
    }

    // Listen to bluetooth state changes
    bluetoothPrint.state.listen((state) {
      if (mounted) {
        switch (state) {
          case BluetoothPrint.connected:
            setState(() {
              _connected = true;
            });
            break;
          case BluetoothPrint.disconnected:
            setState(() {
              _connected = false;
              _selectedDevice = null;
            });
            break;
          default:
            break;
        }
      }
    });

    // Load saved device
    await _loadSavedBluetoothDevice();
  }

  /// Memuat device bluetooth yang tersimpan
  Future<void> _loadSavedBluetoothDevice() async {
    final prefs = await SharedPreferences.getInstance();
    final deviceAddress = prefs.getString('bluetooth_device_address');
    final deviceName = prefs.getString('bluetooth_device_name');

    if (deviceAddress != null && deviceName != null) {
      final device = BluetoothDevice();
      device.name = deviceName;
      device.address = deviceAddress;

      if (mounted) {
        setState(() {
          _selectedDevice = device;
        });
      }
    }
  }

  /// Menyimpan device bluetooth yang terhubung
  Future<void> _saveBluetoothDevice(BluetoothDevice device) async {
    final prefs = await SharedPreferences.getInstance();
    await prefs.setString('bluetooth_device_address', device.address ?? '');
    await prefs.setString('bluetooth_device_name', device.name ?? '');
  }

  /// Menyimpan konfigurasi ke shared preferences.
  ///
  /// Setelah menyimpan, metode ini akan kembali ke ReceiptScreen dengan hasil `true`
  /// untuk memberi tahu ReceiptScreen bahwa kredensial telah diperbarui dan perlu
  /// memuat ulang daftar akun.
  Future<void> _saveConfig() async {
    if (_formKey.currentState!.validate()) {
      final prefs = await SharedPreferences.getInstance();
      await prefs.setString(_prefsKeyUrl, _urlController.text);
      await prefs.setString(_prefsKeyToken, _tokenController.text);

      // Menampilkan snackbar konfirmasi
      if (mounted) {
        ScaffoldMessenger.of(context).showSnackBar(
          const SnackBar(content: Text('Konfigurasi tersimpan!')),
        );

        // Kembali ke ReceiptScreen dan memberi tahu untuk memuat ulang data
        Navigator.pop(context, true);
      }
    }
  }

  /// Menguji koneksi ke Firefly III.
  ///
  /// Metode ini menguji apakah URL Firefly III yang dimasukkan pengguna
  /// dapat dijangkau dan merespons dengan benar.
  Future<void> _testConnection() async {
    if (_urlController.text.isEmpty) {
      if (mounted) {
        ScaffoldMessenger.of(context).showSnackBar(
          const SnackBar(
              content:
                  Text('Silakan masukkan URL Firefly III terlebih dahulu')),
        );
      }
      return;
    }

    setState(() {
      _isTestingConnection = true;
    });

    try {
      final isConnected =
          await FireflyApiService.testConnection(baseUrl: _urlController.text);

      if (mounted) {
        if (isConnected) {
          ScaffoldMessenger.of(context).showSnackBar(
            const SnackBar(content: Text('Koneksi berhasil!')),
          );
        } else {
          ScaffoldMessenger.of(context).showSnackBar(
            const SnackBar(
                content: Text(
                    'Koneksi gagal. Periksa URL dan koneksi internet Anda.')),
          );
        }
      }
    } catch (e) {
      if (mounted) {
        ScaffoldMessenger.of(context).showSnackBar(
          const SnackBar(
              content: Text('Terjadi kesalahan saat menguji koneksi')),
        );
      }
    } finally {
      if (mounted) {
        setState(() {
          _isTestingConnection = false;
        });
      }
    }
  }

  /// Menguji autentikasi dengan token.
  ///
  /// Metode ini menguji apakah Personal Access Token yang dimasukkan pengguna
  /// valid dan dapat digunakan untuk mengakses API Firefly III.
  Future<void> _testAuthentication() async {
    if (_urlController.text.isEmpty || _tokenController.text.isEmpty) {
      if (mounted) {
        ScaffoldMessenger.of(context).showSnackBar(
          const SnackBar(
              content: Text(
                  'Silakan masukkan URL dan token Firefly III terlebih dahulu')),
        );
      }
      return;
    }

    setState(() {
      _isTestingAuth = true;
    });

    try {
      final isAuthenticated = await FireflyApiService.testAuthentication(
        baseUrl: _urlController.text,
        accessToken: _tokenController.text,
      );

      if (mounted) {
        if (isAuthenticated) {
          ScaffoldMessenger.of(context).showSnackBar(
            const SnackBar(content: Text('Autentikasi berhasil!')),
          );
        } else {
          ScaffoldMessenger.of(context).showSnackBar(
            const SnackBar(
                content: Text('Autentikasi gagal. Periksa token Anda.')),
          );
        }
      }
    } catch (e) {
      if (mounted) {
        ScaffoldMessenger.of(context).showSnackBar(
          const SnackBar(
              content: Text('Terjadi kesalahan saat menguji autentikasi')),
        );
      }
    } finally {
      if (mounted) {
        setState(() {
          _isTestingAuth = false;
        });
      }
    }
  }

  /// Mulai scan perangkat Bluetooth
  Future<void> _startScan() async {
    setState(() {
      _isScanning = true;
      _devices.clear();
    });

    try {
      await bluetoothPrint.startScan(timeout: const Duration(seconds: 4));

      // Listen to scan results
      bluetoothPrint.scanResults.listen((devices) {
        if (mounted) {
          setState(() {
            _devices = devices;
          });
        }
      });
    } catch (e) {
      if (mounted) {
        ScaffoldMessenger.of(context).showSnackBar(
          SnackBar(content: Text('Gagal memindai perangkat: $e')),
        );
      }
    } finally {
      if (mounted) {
        setState(() {
          _isScanning = false;
        });
      }
    }
  }

  /// Menghubungkan ke perangkat Bluetooth
  Future<void> _connectToDevice(BluetoothDevice device) async {
    try {
      await bluetoothPrint.connect(device);

      // Simpan device yang terhubung
      await _saveBluetoothDevice(device);

      if (mounted) {
        setState(() {
          _selectedDevice = device;
        });

        ScaffoldMessenger.of(context).showSnackBar(
          SnackBar(content: Text('Terhubung ke ${device.name}')),
        );
      }
    } catch (e) {
      if (mounted) {
        ScaffoldMessenger.of(context).showSnackBar(
          SnackBar(content: Text('Gagal terhubung ke ${device.name}: $e')),
        );
      }
    }
  }

  /// Memutuskan koneksi dari printer bluetooth
  Future<void> _disconnectPrinter() async {
    try {
      await bluetoothPrint.disconnect();

      // Hapus device yang tersimpan
      final prefs = await SharedPreferences.getInstance();
      await prefs.remove('bluetooth_device_address');
      await prefs.remove('bluetooth_device_name');

      if (mounted) {
        setState(() {
          _selectedDevice = null;
        });

        ScaffoldMessenger.of(context).showSnackBar(
          const SnackBar(content: Text('Printer terputus')),
        );
      }
    } catch (e) {
      if (mounted) {
        ScaffoldMessenger.of(context).showSnackBar(
          SnackBar(content: Text('Gagal memutuskan koneksi: $e')),
        );
      }
    }
  }

  /// Membuka dialog konfigurasi teks kustom
  Future<void> _openCustomTextConfig() async {
    final result = await showDialog<bool>(
      context: context,
      builder: (context) => const CustomTextConfigDialog(),
    );

    // Jika teks berhasil disimpan, tampilkan snackbar konfirmasi
    if (result == true && mounted) {
      ScaffoldMessenger.of(context).showSnackBar(
        const SnackBar(content: Text('Teks kustom tersimpan!')),
      );
    }
  }

  @override
  void dispose() {
    _urlController.dispose();
    _tokenController.dispose();
    super.dispose();
  }

  @override
  Widget build(BuildContext context) {
    return Scaffold(
      appBar: AppBar(
        title: const Text('Konfigurasi'),
      ),
      body: SingleChildScrollView(
        padding: const EdgeInsets.all(16.0),
        child: Form(
          key: _formKey,
          child: Column(
            crossAxisAlignment: CrossAxisAlignment.stretch,
            children: [
              // Firefly III Configuration Section
              const Text(
                'Konfigurasi Firefly III',
                style: TextStyle(fontSize: 20, fontWeight: FontWeight.bold),
              ),
              const SizedBox(height: 10),
              const Text(
                'Masukkan detail koneksi ke instance Firefly III Anda:',
                style: TextStyle(fontSize: 16),
              ),
              const SizedBox(height: 20),

              // TextField untuk URL
              TextFormField(
                controller: _urlController,
                decoration: const InputDecoration(
                  labelText: 'Firefly III URL',
                  hintText: 'https://firefly.yourdomain.com',
                  border: OutlineInputBorder(),
                ),
                validator: (value) {
                  if (value == null || value.isEmpty) {
                    return 'URL tidak boleh kosong';
                  }
                  // Validasi sederhana untuk URL
                  if (!value.startsWith('http')) {
                    return 'URL harus dimulai dengan http:// atau https://';
                  }
                  return null;
                },
              ),
              const SizedBox(height: 20),

              // TextField untuk Token
              TextFormField(
                controller: _tokenController,
                decoration: const InputDecoration(
                  labelText: 'Personal Access Token',
                  border: OutlineInputBorder(),
                ),
                obscureText: true, // Sembunyikan token
                validator: (value) {
                  if (value == null || value.isEmpty) {
                    return 'Token tidak boleh kosong';
                  }
                  return null;
                },
              ),
              const SizedBox(height: 20),

              // Tombol Simpan
              ElevatedButton.icon(
                onPressed: _saveConfig,
                icon: const Icon(Icons.save),
                label: const Text('Simpan Konfigurasi'),
              ),
              const SizedBox(height: 10),

              // Tombol Test Connection
              ElevatedButton.icon(
                onPressed: _isTestingConnection ? null : _testConnection,
                icon: _isTestingConnection
                    ? const SizedBox(
                        width: 20,
                        height: 20,
                        child: CircularProgressIndicator(strokeWidth: 2),
                      )
                    : const Icon(Icons.link),
                label: Text(_isTestingConnection
                    ? 'Menguji Koneksi...'
                    : 'Test Koneksi'),
              ),
              const SizedBox(height: 10),

              // Tombol Test Authentication
              ElevatedButton.icon(
                onPressed: _isTestingAuth ? null : _testAuthentication,
                icon: _isTestingAuth
                    ? const SizedBox(
                        width: 20,
                        height: 20,
                        child: CircularProgressIndicator(strokeWidth: 2),
                      )
                    : const Icon(Icons.verified_user),
                label: Text(_isTestingAuth
                    ? 'Menguji Autentikasi...'
                    : 'Test Autentikasi'),
              ),
              const SizedBox(height: 30),

              // Bluetooth Printer Configuration Section
              const Text(
                'Pengaturan Printer Bluetooth',
                style: TextStyle(fontSize: 20, fontWeight: FontWeight.bold),
              ),
              const SizedBox(height: 10),
              const Text(
                'Hubungkan printer thermal Anda melalui Bluetooth untuk mencetak struk.',
                style: TextStyle(fontSize: 16),
              ),
              const SizedBox(height: 20),

              // Status koneksi printer
              Container(
                padding: const EdgeInsets.all(16.0),
                decoration: BoxDecoration(
                  border: Border.all(color: Colors.grey),
                  borderRadius: BorderRadius.circular(8.0),
                ),
                child: Row(
                  mainAxisAlignment: MainAxisAlignment.spaceBetween,
                  children: [
                    Text(
                      _connected
                          ? 'Printer Terhubung: ${_selectedDevice?.name ?? 'Unknown'}'
                          : 'Printer Tidak Terhubung',
                      style: TextStyle(
                        fontSize: 16,
                        color: _connected ? Colors.green : Colors.red,
                      ),
                    ),
                    Icon(
                      _connected
                          ? Icons.bluetooth_connected
                          : Icons.bluetooth_disabled,
                      color: _connected ? Colors.green : Colors.red,
                    ),
                  ],
                ),
              ),
              const SizedBox(height: 20),

              // Tombol Scan Bluetooth
              ElevatedButton.icon(
                onPressed: _isScanning ? null : _startScan,
                icon: _isScanning
                    ? const SizedBox(
                        width: 20,
                        height: 20,
                        child: CircularProgressIndicator(strokeWidth: 2),
                      )
                    : const Icon(Icons.bluetooth_searching),
                label: Text(_isScanning ? 'Memindai...' : 'Scan Perangkat'),
              ),
              const SizedBox(height: 20),

              // Daftar perangkat yang ditemukan
              if (_devices.isNotEmpty) ...[
                const Text(
                  'Perangkat yang Ditemukan:',
                  style: TextStyle(fontSize: 16, fontWeight: FontWeight.bold),
                ),
                const SizedBox(height: 10),
                ListView.builder(
                  shrinkWrap: true,
                  physics: const NeverScrollableScrollPhysics(),
                  itemCount: _devices.length,
                  itemBuilder: (context, index) {
                    final device = _devices[index];
                    return Card(
                      child: ListTile(
                        title: Text(device.name ?? 'Unknown Device'),
                        subtitle: Text(device.address ?? ''),
                        trailing: ElevatedButton(
                          onPressed: () => _connectToDevice(device),
                          child: const Text('Hubungkan'),
                        ),
                      ),
                    );
                  },
                ),
                const SizedBox(height: 20),
              ],

              // Tombol Putuskan Koneksi
              if (_connected)
                ElevatedButton.icon(
                  onPressed: _disconnectPrinter,
                  icon: const Icon(Icons.bluetooth_disabled),
                  label: const Text('Putuskan Koneksi'),
                  style: ElevatedButton.styleFrom(
                    backgroundColor: Colors.red,
                  ),
                ),
              const SizedBox(height: 30),
            ],
          ),
        ),
      ),
    );
  }
}