part of angel_framework.http;

/// A function that intercepts a request and determines whether handling of it should continue.
typedef Future<bool> Middleware(RequestContext req, ResponseContext res);

/// A function that receives an incoming [RequestContext] and responds to it.
typedef Future RequestHandler(RequestContext req, ResponseContext res);

/// A function that handles an [HttpRequest].
typedef Future RawRequestHandler(HttpRequest request);

/// A convenience wrapper around an incoming HTTP request.
class RequestContext {
  /// The [Angel] instance that is responding to this request.
  Angel app;

  /// Any cookies sent with this request.
  List<Cookie> get cookies => underlyingRequest.cookies;

  /// All HTTP headers sent with this request.
  HttpHeaders get headers => underlyingRequest.headers;

  /// The requested hostname.
  String get hostname => underlyingRequest.headers.value(HttpHeaders.HOST);

  /// The user's IP.
  String get ip => remoteAddress.address;

  /// This request's HTTP method.
  String get method => underlyingRequest.method;

  /// All post data submitted to the server.
  Map body = {};

  /// The content type of an incoming request.
  ContentType contentType;

  /// Any and all files sent to the server with this request.
  List<FileUploadInfo> files = [];

  /// The URL parameters extracted from the request URI.
  Map params = {};

  /// The requested path.
  String path;

  /// The parsed request query string.
  Map query = {};

  /// The remote address requesting this resource.
  InternetAddress remoteAddress;

  /// The route that matched this request.
  Route route;

  /// The user's HTTP session.
  HttpSession session;

  /// Is this an **XMLHttpRequest**?
  bool get xhr => underlyingRequest.headers.value("X-Requested-With")
      ?.trim()
      ?.toLowerCase() == 'xmlhttprequest';

  /// The underlying [HttpRequest] instance underneath this context.
  HttpRequest underlyingRequest;

  /// Magically transforms an [HttpRequest] into a RequestContext.
  static Future<RequestContext> from(HttpRequest request,
      Map parameters, Angel app, Route sourceRoute) async {
    RequestContext context = new RequestContext();

    context.app = app;
    context.contentType = request.headers.contentType;
    context.remoteAddress = request.connectionInfo.remoteAddress;
    context.params = parameters;
    context.path = request.uri.toString();
    context.route = sourceRoute;
    context.session = request.session;
    context.underlyingRequest = request;

    BodyParseResult bodyParseResult = await parseBody(request);
    context.query = bodyParseResult.query;
    context.body = bodyParseResult.body;
    context.files = bodyParseResult.files;

    return context;
  }
}