import 'package:flutter/material.dart';
import 'package:mobile_scanner/mobile_scanner.dart';

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

  @override
  State<QrScannerScreen> createState() => _QrScannerScreenState();
}

class _QrScannerScreenState extends State<QrScannerScreen> {
  final MobileScannerController _scannerController = MobileScannerController(
    detectionSpeed: DetectionSpeed.normal,
    facing: CameraFacing.back,
  );
  bool _isScanCompleted = false;

  @override
  void dispose() {
    _scannerController.dispose();
    super.dispose();
  }

  @override
  Widget build(BuildContext context) {
    return Scaffold(
      appBar: AppBar(
        title: const Text("Сканировать QR-код"),
        backgroundColor: Colors.black,
        foregroundColor: Colors.white,
      ),
      body: Stack(
        children: [
          MobileScanner(
            controller: _scannerController,
            onDetect: (capture) {
              if (!_isScanCompleted) {
                final String? code = capture.barcodes.first.rawValue;
                if (code != null) {
                  setState(() => _isScanCompleted = true);

                  Navigator.of(context).pop(code);
                }
              }
            },
          ),

          Center(
            child: Container(
              width: 250,
              height: 250,
              decoration: BoxDecoration(
                border: Border.all(color: Colors.white, width: 2),
                borderRadius: BorderRadius.circular(12),
              ),
            ),
          ),
        ],
      ),
    );
  }
}