import 'package:webview_flutter/webview_flutter.dart';
import 'package:webview_flutter_android/webview_flutter_android.dart';

import '../../services/diagnostic_log.dart';

class SchoolBrowserInfo {
  const SchoolBrowserInfo({this.chromiumVersion});
  final String? chromiumVersion;
}

typedef SchoolBrowserConfigurator = Future<SchoolBrowserInfo> Function(
  WebViewController controller,
  String school,
);

/// Configure only the dedicated school browser before its first request.
Future<SchoolBrowserInfo> configureSchoolBrowser(
  WebViewController controller,
  String school,
) async {
  final android = controller.platform;
  if (android is! AndroidWebViewController) return const SchoolBrowserInfo();
  try {
    await android.setUseWideViewPort(true);
    final cookies = WebViewCookieManager().platform;
    if (cookies is AndroidWebViewCookieManager) {
      await cookies.setAcceptThirdPartyCookies(android, true);
    }
    await controller.setOnConsoleMessage((message) {
      final text = message.message.toLowerCase();
      final code = text.contains('mixed content')
          ? 'mixed_content'
          : text.contains('content security policy')
          ? 'content_security_policy'
          : text.contains('cors')
          ? 'cross_origin'
          : text.contains('refused to')
          ? 'resource_refused'
          : message.level == JavaScriptLogLevel.error
          ? 'script_error'
          : null;
      if (code != null) {
        DiagnosticLog.instance.add(
          'school_console_error',
          fields: {'school': school, 'code': code},
        );
      }
    });
    String? version;
    try {
      version = RegExp(r'\bChrome/(\d+(?:\.\d+){0,3})\b')
          .firstMatch(await android.getUserAgent() ?? '')
          ?.group(1);
    } catch (_) {
      /* Version inspection must not block authentication. */
    }
    DiagnosticLog.instance.add(
      'browser_configured',
      fields: {
        'school': school,
        'phase': 'wide_viewport',
        'result': true,
        'code': 'third_party_cookies',
        'version': version,
      },
    );
    return SchoolBrowserInfo(chromiumVersion: version);
  } catch (error) {
    DiagnosticLog.instance.add(
      'browser_setup_failed',
      fields: {'school': school, 'code': error.runtimeType.toString()},
    );
    rethrow;
  }
}