abstract class WebServer {
  static late WebServer _webServer;

  static WebServer getInstance() {
    return _webServer;
  }

  static void setInstance(WebServer server) {
    _webServer = server;
  }

  void start(int port, {Function? interceptor});
  void stop();
  void addHandler(handler);
}

enum HttpMethod {
  GET,
  POST,
  PUT,
  DELETE,
  ALL,
  WS,
  ;

  static HttpMethod valueOf(String type) {
    var tmp = HttpMethod.values.where((t) => t.name == type).toList();
    if (tmp.isEmpty) {
      return HttpMethod.ALL;
    }
    return tmp[0];
  }
}

enum HttpResponseType {
  HTML("text/html; charset=utf-8"),
  TEXT("text/plain; charset=utf-8"),
  XML("text/xml; charset=utf-8"),
  JSON("application/json; charset=utf-8"),
  BINARY("application/octet-stream"),
  ;

  final String type;

  const HttpResponseType(this.type);

  static HttpResponseType valueOf(String type) {
    var tmp = HttpResponseType.values.where((t) => t.type == type).toList();
    if (tmp.isEmpty) {
      return HttpResponseType.JSON;
    }
    return tmp[0];
  }
}

class RequestMapping {
  final HttpMethod method;
  final String path;
  final HttpResponseType responseType;

  const RequestMapping(
      {this.method = HttpMethod.ALL,
      required this.path,
      this.responseType = HttpResponseType.JSON});
}