#include <string>

#include <vector>

#include <fuzzer/FuzzedDataProvider.h>

#include <nghttp2/nghttp2.h>

namespace {

int on_frame_recv_callback(nghttp2_session *session, const nghttp2_frame *frame,

                           void *user_data) {

  return 0;

}

} // namespace

namespace {

int on_begin_headers_callback(nghttp2_session *session,

                              const nghttp2_frame *frame, void *user_data) {

  return 0;

}

} // namespace

namespace {

int on_header_callback2(nghttp2_session *session, const nghttp2_frame *frame,

                        nghttp2_rcbuf *name, nghttp2_rcbuf *value,

                        uint8_t flags, void *user_data) {

  return 0;

}

} // namespace

namespace {

int before_frame_send_callback(nghttp2_session *session,

                               const nghttp2_frame *frame, void *user_data) {

  return 0;

}

} // namespace

namespace {

int on_frame_send_callback(nghttp2_session *session, const nghttp2_frame *frame,

                           void *user_data) {

  return 0;

}

} // namespace

namespace {

void send_pending(nghttp2_session *session) {

  for (;;) {

    const uint8_t *data;

    auto n = nghttp2_session_mem_send2(session, &data);

    if (n == 0) {

      return;

    }

  }

}

} // namespace

extern "C" int LLVMFuzzerTestOneInput(const uint8_t *data, size_t size) {

  nghttp2_session *session;

  nghttp2_session_callbacks *callbacks;

  nghttp2_session_callbacks_new(&callbacks);

  nghttp2_session_callbacks_set_on_frame_recv_callback(callbacks,

                                                       on_frame_recv_callback);

  nghttp2_session_callbacks_set_on_begin_headers_callback(

    callbacks, on_begin_headers_callback);

  nghttp2_session_callbacks_set_on_header_callback2(callbacks,

                                                    on_header_callback2);

  nghttp2_session_callbacks_set_before_frame_send_callback(

    callbacks, before_frame_send_callback);

  nghttp2_session_callbacks_set_on_frame_send_callback(callbacks,

                                                       on_frame_send_callback);

  nghttp2_session_server_new(&session, callbacks, nullptr);

  nghttp2_session_callbacks_del(callbacks);

  FuzzedDataProvider data_provider(data, size);

  /* Initialise a random iv */

  nghttp2_settings_entry *iv;

  int size_of_iv = data_provider.ConsumeIntegralInRange(1, 10);

  iv = (nghttp2_settings_entry *)malloc(sizeof(nghttp2_settings_entry) *

                                        size_of_iv);

  for (int i = 0; i < size_of_iv; i++) {

    iv[i].settings_id = data_provider.ConsumeIntegralInRange(0, 1000);

    iv[i].value = data_provider.ConsumeIntegralInRange(0, 1000);

  }

  nghttp2_submit_settings(session, NGHTTP2_FLAG_NONE, iv, size_of_iv);

  send_pending(session);

  std::vector<uint8_t> d = data_provider.ConsumeRemainingBytes<uint8_t>();

  nghttp2_session_mem_recv2(session, d.data(), d.size());

  send_pending(session);

  nghttp2_session_del(session);

  free(iv);

  return 0;

}