import 'package:flutter/material.dart';
import 'package:bluetooth_print/bluetooth_print.dart';
import 'package:bluetooth_print/bluetooth_print_model.dart';

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

  @override
  State<PrinterSetupScreen> createState() => _PrinterSetupScreenState();
}

class _PrinterSetupScreenState extends State<PrinterSetupScreen> {
  BluetoothPrint bluetoothPrint = BluetoothPrint.instance;
  bool _isScanning = false;
  List<BluetoothDevice> _devices = [];
  BluetoothDevice? _selectedDevice;
  bool _connected = false;

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

  Future<void> _initBluetooth() async {
    // Periksa status koneksi
    final isConnected = await bluetoothPrint.isConnected ?? false;
    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;
        }
      }
    });
  }

  Future<void> _scanDevices() async {
    setState(() {
      _isScanning = true;
      _devices = [];
    });

    try {
      // Mulai scan perangkat Bluetooth
      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 {
      setState(() {
        _isScanning = false;
      });
    }
  }

  Future<void> _connectToDevice(BluetoothDevice device) async {
    try {
      await bluetoothPrint.connect(device);
      setState(() {
        _selectedDevice = device;
      });
      
      if (mounted) {
        ScaffoldMessenger.of(context).showSnackBar(
          const SnackBar(content: Text('Berhasil terhubung ke printer')),
        );
      }
    } catch (e) {
      if (mounted) {
        ScaffoldMessenger.of(context).showSnackBar(
          SnackBar(content: Text('Gagal terhubung ke printer: $e')),
        );
      }
    }
  }

  Future<void> _disconnect() async {
    try {
      await bluetoothPrint.disconnect();
      setState(() {
        _selectedDevice = null;
      });
      
      if (mounted) {
        ScaffoldMessenger.of(context).showSnackBar(
          const SnackBar(content: Text('Printer terputus')),
        );
      }
    } catch (e) {
      if (mounted) {
        ScaffoldMessenger.of(context).showSnackBar(
          SnackBar(content: Text('Gagal memutus koneksi: $e')),
        );
      }
    }
  }

  @override
  Widget build(BuildContext context) {
    return Scaffold(
      appBar: AppBar(
        title: const Text('Pengaturan Printer'),
        centerTitle: true,
      ),
      body: Padding(
        padding: const EdgeInsets.all(16.0),
        child: Column(
          children: [
            const Text(
              'Setup Printer Bluetooth',
              style: TextStyle(fontSize: 18, fontWeight: FontWeight.bold),
            ),
            const SizedBox(height: 16),
            const Text(
              'Hubungkan printer thermal Anda melalui Bluetooth untuk mencetak struk.',
            ),
            const SizedBox(height: 16),
            
            // Status koneksi
            Container(
              padding: const EdgeInsets.all(16),
              decoration: BoxDecoration(
                border: Border.all(color: Colors.grey),
                borderRadius: BorderRadius.circular(8),
              ),
              child: Row(
                mainAxisAlignment: MainAxisAlignment.spaceBetween,
                children: [
                  const Text('Status Printer:'),
                  Text(
                    _connected ? 'Terhubung' : 'Terputus',
                    style: TextStyle(
                      color: _connected ? Colors.green : Colors.red,
                      fontWeight: FontWeight.bold,
                    ),
                  ),
                ],
              ),
            ),
            
            const SizedBox(height: 16),
            
            // Tombol scan
            ElevatedButton.icon(
              onPressed: _isScanning ? null : _scanDevices,
              icon: _isScanning 
                  ? const SizedBox(
                      width: 20,
                      height: 20,
                      child: CircularProgressIndicator(strokeWidth: 2),
                    )
                  : const Icon(Icons.bluetooth_searching),
              label: Text(_isScanning ? 'Memindai...' : 'Cari Printer'),
            ),
            
            const SizedBox(height: 16),
            
            // Daftar perangkat
            Expanded(
              child: _devices.isEmpty
                  ? const Center(
                      child: Text('Tidak ada perangkat ditemukan'),
                    )
                  : ListView.builder(
                      itemCount: _devices.length,
                      itemBuilder: (context, index) {
                        final device = _devices[index];
                        final isSelected = _selectedDevice?.address == device.address;
                        
                        return Card(
                          child: ListTile(
                            title: Text(device.name ?? 'Unknown Device'),
                            subtitle: Text(device.address ?? ''),
                            trailing: isSelected
                                ? const Icon(Icons.check, color: Colors.green)
                                : null,
                            onTap: () => _connectToDevice(device),
                          ),
                        );
                      },
                    ),
            ),
            
            // Tombol disconnect
            if (_connected)
              Padding(
                padding: const EdgeInsets.only(top: 16),
                child: ElevatedButton.icon(
                  onPressed: _disconnect,
                  icon: const Icon(Icons.bluetooth_disabled),
                  label: const Text('Putus Koneksi'),
                  style: ElevatedButton.styleFrom(
                    backgroundColor: Colors.red,
                  ),
                ),
              ),
          ],
        ),
      ),
    );
  }
}