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

class QRCodeScannerScreen extends StatefulWidget {
  const QRCodeScannerScreen({Key? key}) : super(key: key);

  @override
  _QRCodeScannerScreenState createState() => _QRCodeScannerScreenState();
}

class _QRCodeScannerScreenState extends State<QRCodeScannerScreen> {
  MobileScannerController cameraController = MobileScannerController();

  bool isScanning = true;

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

  Future<void> _createContactFromVCard(String vCardData) async {
    // Parse VCard data
    final Map<String, dynamic> contactInfo = _parseVCard(vCardData);

    debugPrint("contactInfo: $contactInfo");

    // // Create a new contact
    // Contact newContact = Contact();
    //
    // // Set contact's name
    // newContact.name = Name(
    //   first: contactInfo['firstName'] ?? '',
    //   last: contactInfo['lastName'] ?? '',
    // );
    //
    // // Set contact's phone numbers
    // if (contactInfo['phone'] != null) {
    //   newContact.phones = [
    //     Phone(contactInfo['phone'], label: PhoneLabel.mobile),
    //   ];
    // }
    //
    // // Set contact's emails
    // if (contactInfo['email'] != null) {
    //   newContact.emails = [
    //     Email(contactInfo['email'], label: EmailLabel.home),
    //   ];
    // }
    //
    // // Request permission to write contacts
    // bool permission = await FlutterContacts.requestPermission(readonly: false);
    // if (!permission) {
    //   // Handle permission denied
    //   ScaffoldMessenger.of(context).showSnackBar(
    //     SnackBar(content: Text('Contacts permission denied')),
    //   );
    //   return;
    // }
    //
    // // Save the contact
    // await newContact.insert();
  }

  Map<String, dynamic> _parseVCard(String vCardData) {
    // Simple parser for VCard data
    final Map<String, dynamic> contactInfo = {};

    final lines = vCardData.split(RegExp(r'\r?\n'));
    for (var line in lines) {
      if (line.startsWith('FN:')) {
        contactInfo['fullName'] = line.substring(3).trim();
      } else if (line.startsWith('N:')) {
        final names = line.substring(2).split(';');
        contactInfo['lastName'] = names[0].trim();
        contactInfo['firstName'] = names.length > 1 ? names[1].trim() : '';
      } else if (line.startsWith('TEL:')) {
        contactInfo['phone'] = line.substring(4).trim();
      } else if (line.startsWith('EMAIL:')) {
        contactInfo['email'] = line.substring(6).trim();
      }
      // Add more fields as needed
    }

    return contactInfo;
  }

  void _showContactAddedDialog() {
    showDialog(
      context: context,
      builder: (context) => AlertDialog(
        title: Text('Contact Added'),
        content: Text('The contact has been added to your address book.'),
        actions: [
          TextButton(
            onPressed: () {
              Navigator.of(context).pop(); // Close dialog
              Navigator.of(context).pop(); // Go back to previous screen
            },
            child: Text('OK'),
          ),
        ],
      ),
    );
  }

  void _showInvalidQRDialog() {
    showDialog(
      context: context,
      builder: (context) => AlertDialog(
        title: Text('Invalid QR Code'),
        content: Text('The scanned QR code does not contain valid contact information.'),
        actions: [
          TextButton(
            onPressed: () {
              Navigator.of(context).pop(); // Close dialog
              isScanning = true; // Resume scanning
            },
            child: Text('Try Again'),
          ),
        ],
      ),
    );
  }

  @override
  Widget build(BuildContext context) {
    return Scaffold(
      appBar: AppBar(
        title: Text('Scan Contact QR Code'),
      ),
      body: MobileScanner(
        controller: cameraController,
        onDetect: (capture) {
          if (!isScanning) return;

          isScanning = false; // Prevent multiple scans
          final List<Barcode> barcodes = capture.barcodes;

          for (final barcode in barcodes) {
            final String? code = barcode.rawValue;
            if (code != null && code.contains('BEGIN:VCARD')) {
              // Handle valid vCard QR code
              _createContactFromVCard(code);
              _showContactAddedDialog(); // TODO: Be a confirmation button "do you want to add XXX to your contacts?"
              break;
            }
          }

          if (!barcodes.any((barcode) =>
          barcode.rawValue != null && barcode.rawValue!.contains('BEGIN:VCARD'))) {
            // If no valid QR code is found
            _showInvalidQRDialog();
            isScanning = true; // Allow scanning again for invalid QR codes
          }
        },
      ),
    );
  }
}