enum Environment {
  production,
}

class AppConfig {
  static const Environment currentEnvironment = Environment.production;
  static const String appName = '本地打包';
  static const String appLogo = '';
  static const String canonicalWebHost = 'h5-im.imharry.work';
  static const Set<String> legacyWebHosts = {
    'h5-test.imharry.work',
  };

  static final Map<Environment, List<String>> _environmentHosts = {
    Environment.production: [
      canonicalWebHost,
    ],
  };

  static List<String> get environmentHosts {
    return _environmentHosts[currentEnvironment] ?? const [];
  }

  static String homeUrl({String? appName, String? appLogo}) {
    final host =
        environmentHosts.isNotEmpty ? environmentHosts.first : canonicalWebHost;
    final uri = Uri.parse(_normalizeHomeUrl(host));
    return uri.toString();
  }

  static String withFreshShellParams(String url) {
    return _removeShellParams(Uri.parse(url)).toString();
  }

  static bool shouldRewriteMainFrameUrl(String url) {
    final uri = Uri.tryParse(url);
    if (uri == null) {
      return false;
    }

    final host = uri.host.toLowerCase();
    return legacyWebHosts.contains(host) || _hasShellParams(uri);
  }

  static String canonicalizeMainFrameUrl(String url) {
    final uri = _removeShellParams(Uri.parse(url));
    final host = uri.host.toLowerCase();
    if (!legacyWebHosts.contains(host)) {
      return uri.toString();
    }

    return uri
        .replace(
          scheme: 'https',
          host: canonicalWebHost,
        )
        .toString();
  }

  static Uri _removeShellParams(Uri uri) {
    final queryParameters = Map<String, String>.from(uri.queryParameters);
    queryParameters.remove('flutter_shell');
    queryParameters.remove('shell_cache_bust');
    queryParameters.remove('shell_app_name');
    queryParameters.remove('shell_app_logo');
    final fragmentParameters = Uri.splitQueryString(uri.fragment);
    fragmentParameters.remove('shell_app_name');
    fragmentParameters.remove('shell_app_logo');

    return uri.replace(
      queryParameters: queryParameters,
      fragment: fragmentParameters.isEmpty
          ? ''
          : Uri(queryParameters: fragmentParameters).query,
    );
  }

  static bool _hasShellParams(Uri uri) {
    final fragmentParameters = Uri.splitQueryString(uri.fragment);
    return uri.queryParameters.containsKey('flutter_shell') ||
        uri.queryParameters.containsKey('shell_cache_bust') ||
        uri.queryParameters.containsKey('shell_app_name') ||
        uri.queryParameters.containsKey('shell_app_logo') ||
        fragmentParameters.containsKey('shell_app_name') ||
        fragmentParameters.containsKey('shell_app_logo');
  }

  static String _normalizeHomeUrl(String host) {
    final value = host.trim();
    final normalized =
        value.startsWith('http://') || value.startsWith('https://')
            ? value
            : 'https://$value';
    final uri = Uri.parse(normalized);
    final path = uri.path.isEmpty ? '/' : uri.path;
    return uri.replace(path: path).toString();
  }
}