// Copyright (c) 2013, the Dart project authors.  Please see the AUTHORS file
// for details. All rights reserved. Use of this source code is governed by a
// BSD-style license that can be found in the LICENSE file.
//

import "dart:isolate";
import "dart:io";
import "package:expect/expect.dart";

void test(int totalConnections, [String? body]) {
  HttpServer.bind("127.0.0.1", 0).then((server) {
    server.listen((HttpRequest request) {
      HttpResponse response = request.response;
      // Cannot mutate request headers.
      Expect.throws(() => request.headers.add("X-Request-Header", "value"),
          (e) => e is HttpException);
      Expect.equals("value", request.headers.value("X-Request-Header"));
      request.listen((_) {}, onDone: () {
        // Can still mutate response headers as long as no data has been sent.
        response.headers.add("X-Response-Header", "value");
        if (body != null) {
          response.write(body);
          // Cannot change state or reason when data has been sent.
          Expect.throwsStateError(() => response.statusCode = 200);
          Expect.throwsStateError(() => response.reasonPhrase = "OK");
          // Cannot mutate response headers when data has been sent.
          Expect.throws(
              () => response.headers.add("X-Request-Header", "value2"),
              (e) => e is HttpException);
        }
        response..close();
        // Cannot change state or reason after connection is closed.
        Expect.throwsStateError(() => response.statusCode = 200);
        Expect.throwsStateError(() => response.reasonPhrase = "OK");
        // Cannot mutate response headers after connection is closed.
        Expect.throws(() => response.headers.add("X-Request-Header", "value3"),
            (e) => e is HttpException);
      });
    });

    int count = 0;
    HttpClient client = new HttpClient();
    for (int i = 0; i < totalConnections; i++) {
      client
          .get("127.0.0.1", server.port, "/")
          .then((HttpClientRequest request) {
        if (body != null) {
          request.contentLength = -1;
        }
        // Can still mutate request headers as long as no data has been sent.
        request.headers.add("X-Request-Header", "value");
        if (body != null) {
          request.write(body);
          // Cannot mutate request headers when data has been sent.
          Expect.throws(() => request.headers.add("X-Request-Header", "value2"),
              (e) => e is HttpException);
        }
        request.close();
        // Cannot mutate request headers when data has been sent.
        Expect.throws(() => request.headers.add("X-Request-Header", "value3"),
            (e) => e is HttpException);
        return request.done;
      }).then((HttpClientResponse response) {
        // Cannot mutate response headers.
        Expect.throws(() => response.headers.add("X-Response-Header", "value"),
            (e) => e is HttpException);
        Expect.equals("value", response.headers.value("X-Response-Header"));
        response.listen((_) {}, onDone: () {
          // Do not close the connections before we have read the
          // full response bodies for all connections.
          if (++count == totalConnections) {
            client.close();
            server.close();
          }
        });
      });
    }
  });
}

void main() {
  test(5);
  test(5, "Hello and goodbye");
}