spotube/lib/src/plugin_api/webview/webview_page.dart

import 'dart:io';

import 'package:flutter/material.dart';
import 'package:flutter_inappwebview/flutter_inappwebview.dart';
import 'package:path/path.dart';
import 'package:path_provider/path_provider.dart';
import 'package:fk_user_agent/fk_user_agent.dart';

Future<String?> getUserAgent() async {
  if (Platform.isIOS || Platform.isAndroid) {
    await FkUserAgent.init();
    return FkUserAgent.userAgent;
  }
  return null;
}

final webViewEnvironment = Platform.isWindows
    ? getApplicationSupportDirectory().then((directory) async {
        return await WebViewEnvironment.create(
          settings: WebViewEnvironmentSettings(
            userDataFolder: join(directory.path, 'inappwebview_data'),
          ),
        );
      })
    : Future.value(null);

class WebviewPage extends StatelessWidget {
  final String uri;
  final void Function(String url)? onLoad;
  const WebviewPage({super.key, required this.uri, this.onLoad});

  @override
  Widget build(BuildContext context) {
    return FutureBuilder(
      future: Future.wait([webViewEnvironment, getUserAgent()]),
      builder: (context, snapshot) {
        if (snapshot.connectionState == ConnectionState.waiting) {
          return const Center(child: CircularProgressIndicator());
        }

        return InAppWebView(
          initialUrlRequest: URLRequest(url: WebUri(uri)),
          webViewEnvironment: snapshot.data?[0] as WebViewEnvironment?,
          initialSettings: InAppWebViewSettings(
            userAgent: snapshot.data?[1] as String?,
          ),
          onLoadStop: (controller, url) {
            try {
              if (onLoad != null && url != null) {
                onLoad!(url.toString());
              }
            } catch (e, stack) {
              debugPrint("[Webview][onLoad] Error: $e");
              debugPrintStack(stackTrace: stack);
              rethrow;
            }
          },
        );
      },
    );
  }
}