<uses-permission android:name="android.permission.CAMERA"/>
<uses-permission android:name="android.permission.QUERY_ALL_PACKAGES" />

_controller = WebViewController()
  ..setJavaScriptMode(JavaScriptMode.unrestricted)
  ..setBackgroundColor(const Color(0x00000000))
  ..setNavigationDelegate(
    NavigationDelegate(
      onProgress: (int progress) {},
      onPageStarted: (String url) {},
      onPageFinished: (String url) {},
      onWebResourceError: (WebResourceError error) {},
      onNavigationRequest: (NavigationRequest request) {
        return NavigationDecision.navigate;
      },
    ),
  )
  ..loadRequest(Uri.parse('https://demo3.dynamsoft.com/web-twain/mobile-online-camera-scanner/'));

Future<void> launchURL(String url) async {
  await launchUrlString(url);
}

Future<void> launchIntent() async {
  if (Platform.isAndroid) {
    try {
      AndroidIntent intent = const AndroidIntent(
        componentName: 'com.dynamsoft.mobilescan.MainActivity',
        package: 'com.dynamsoft.mobilescan',
      );
      await intent.launch();
    } catch (e) {
      // If the app is not installed, open the Google Play store to install the app.
      launchURL(
          'https://play.google.com/store/apps/details?id=com.dynamsoft.mobilescan');
    }
  }
}

onNavigationRequest: (NavigationRequest request) {
  if (request.url.startsWith('intent://')) {
    launchIntent();
    return NavigationDecision.prevent;
  } else if (request.url.endsWith('.apk')) {
    launchURL(
        'https://play.google.com/store/apps/details?id=com.dynamsoft.mobilescan');
    return NavigationDecision.prevent;
  }
  return NavigationDecision.navigate;
},

Future<void> requestCameraPermission() async {
  final status = await Permission.camera.request();
  if (status == PermissionStatus.granted) {
  } else if (status == PermissionStatus.denied) {
  } else if (status == PermissionStatus.permanentlyDenied) {
  }
}

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

  late final PlatformWebViewControllerCreationParams params;
  params = const PlatformWebViewControllerCreationParams();

  _controller = WebViewController.fromPlatformCreationParams(
    params,
    onPermissionRequest: (WebViewPermissionRequest request) {
      request.grant();
    },
  )
    ..setJavaScriptMode(JavaScriptMode.unrestricted)

  ...

  requestCameraPermission();
}

class _MyAppPageState extends State<MyAppPage>
    with SingleTickerProviderStateMixin {
  late TabController _tabController;

  @override
  void initState() {
    super.initState();
    _tabController = TabController(vsync: this, length: 3);

    ...
  }

  @override
  Widget build(BuildContext context) {
    return Scaffold(
      body: TabBarView(
        controller: _tabController,
        children: [
          HomeView(title: 'Web TWAIN Demo', controller: _controller),
          const HistoryView(title: 'History'),
          const AboutView(title: 'About the SDK'),
        ],
      ),
      bottomNavigationBar: TabBar(
        labelColor: Colors.blue,
        controller: _tabController,
        tabs: const [
          Tab(icon: Icon(Icons.home), text: 'Home'),
          Tab(icon: Icon(Icons.history_sharp), text: 'History'),
          Tab(icon: Icon(Icons.info), text: 'About'),
        ],
      ),
    );
  }
}

DWObject.ConvertToBase64([DWObject.CurrentImageIndexInBuffer], 1, (result, indices, type) =>{})

_controller = WebViewController.fromPlatformCreationParams(
    params,
    onPermissionRequest: (WebViewPermissionRequest request) {
      request.grant();
    },
  )
    ..addJavaScriptChannel(
      'ImageData',
      onMessageReceived: (JavaScriptMessage message) {
        saveImage(message.message).then((value) {
          showToast(value);
        });
      },
    )

IconButton(
  icon: const Icon(Icons.save),
  onPressed: () async {
    widget.controller.runJavaScript(
        'DWObject.ConvertToBase64([DWObject.CurrentImageIndexInBuffer], 1, (result, indices, type) =>{ImageData.postMessage(result._content)})');
  },
),

String getImageName() {
  // Get the current date and time.
  DateTime now = DateTime.now();

  // Format the date and time to create a timestamp.
  String timestamp =
      '${now.year}${now.month}${now.day}_${now.hour}${now.minute}${now.second}';

  // Create the image file name with the timestamp.
  String imageName = 'image_$timestamp.jpg';

  return imageName;
}

Future<String> saveImage(String base64String) async {
  Uint8List bytes = base64Decode(base64String);

  // Get the app directory
  final directory = await getApplicationDocumentsDirectory();

  // Create the file path
  String imageName = getImageName();
  final filePath = '${directory.path}/$imageName';

  // Write the bytes to the file
  await File(filePath).writeAsBytes(bytes);

  return filePath;
}

Future<List<String>> getImages() async {
  // Get the app directory
  final directory = await getApplicationDocumentsDirectory();

  // Get the list of files in the app directory
  List<FileSystemEntity> files = directory.listSync();

  // Get the file paths
  List<String> filePaths = [];
  for (FileSystemEntity file in files) {
    if (file.path.endsWith('.jpg')) {
      filePaths.add(file.path);
    }
  }

  return filePaths;
}

class DocumentView extends StatelessWidget {
  final String filePath;
  const DocumentView({super.key, required this.filePath});

  @override
  Widget build(BuildContext context) {
    return Scaffold(
      appBar: AppBar(
        title: const Text('Document Viewer'),
      ),
      body: Center(child: Image.file(File(filePath))),
    );
  }
}

IconButton(
  icon: const Icon(Icons.share),
  onPressed: () async {
    if (selectedValue == -1) {
      return;
    }

    await Share.shareXFiles([XFile(_results[selectedValue])],
        text: 'Check out this image!');
  },
),