//
// Copyright Aliaksei Levin (levlam@telegram.org), Arseny Smirnov (arseny30@gmail.com) 2014-2021
//
// Distributed under the Boost Software License, Version 1.0. (See accompanying
// file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
//
#include "td/telegram/ConfigManager.h"
#include "td/telegram/net/DcId.h"
#include "td/telegram/net/PublicRsaKeyShared.h"
#include "td/telegram/net/Session.h"
#include "td/telegram/NotificationManager.h"

#include "td/mtproto/AuthData.h"
#include "td/mtproto/DhHandshake.h"
#include "td/mtproto/Handshake.h"
#include "td/mtproto/HandshakeActor.h"
#include "td/mtproto/Ping.h"
#include "td/mtproto/PingConnection.h"
#include "td/mtproto/ProxySecret.h"
#include "td/mtproto/RawConnection.h"
#include "td/mtproto/RSA.h"
#include "td/mtproto/TlsInit.h"
#include "td/mtproto/TransportType.h"

#include "td/net/GetHostByNameActor.h"
#include "td/net/Socks5.h"
#include "td/net/TransparentProxy.h"

#include "td/actor/actor.h"
#include "td/actor/ConcurrentScheduler.h"
#include "td/actor/PromiseFuture.h"

#include "td/utils/base64.h"
#include "td/utils/common.h"
#include "td/utils/logging.h"
#include "td/utils/port/Clocks.h"
#include "td/utils/port/IPAddress.h"
#include "td/utils/port/SocketFd.h"
#include "td/utils/Random.h"
#include "td/utils/Slice.h"
#include "td/utils/Status.h"
#include "td/utils/tests.h"
#include "td/utils/Time.h"

REGISTER_TESTS(mtproto);

using namespace td;

TEST(Mtproto, GetHostByNameActor) {
  SET_VERBOSITY_LEVEL(VERBOSITY_NAME(ERROR));
  ConcurrentScheduler sched;
  int threads_n = 1;
  sched.init(threads_n);

  int cnt = 1;
  vector<ActorOwn<GetHostByNameActor>> actors;
  {
    auto guard = sched.get_main_guard();

    auto run = [&](ActorId<GetHostByNameActor> actor_id, string host, bool prefer_ipv6, bool allow_ok,
                   bool allow_error) {
      auto promise = PromiseCreator::lambda([&cnt, &actors, num = cnt, host, allow_ok,
                                             allow_error](Result<IPAddress> r_ip_address) {
        if (r_ip_address.is_error() && !allow_error) {
          LOG(ERROR) << num << " \"" << host << "\" " << r_ip_address.error();
        }
        if (r_ip_address.is_ok() && !allow_ok && (r_ip_address.ok().is_ipv6() || r_ip_address.ok().get_ipv4() != 0)) {
          LOG(ERROR) << num << " \"" << host << "\" " << r_ip_address.ok();
        }
        if (--cnt == 0) {
          actors.clear();
          Scheduler::instance()->finish();
        }
      });
      cnt++;
      send_closure_later(actor_id, &GetHostByNameActor::run, host, 443, prefer_ipv6, std::move(promise));
    };

    std::vector<std::string> hosts = {"127.0.0.2",
                                      "1.1.1.1",
                                      "localhost",
                                      "web.telegram.org",
                                      "web.telegram.org.",
                                      "москва.рф",
                                      "",
                                      "%",
                                      " ",
                                      "a",
                                      "\x80",
                                      "[]",
                                      "127.0.0.1.",
                                      "0x12.0x34.0x56.0x78",
                                      "0x7f.001",
                                      "2001:0db8:85a3:0000:0000:8a2e:0370:7334",
                                      "[2001:0db8:85a3:0000:0000:8a2e:0370:7334]",
                                      "[[2001:0db8:85a3:0000:0000:8a2e:0370:7334]]"};
    for (auto types : {vector<GetHostByNameActor::ResolverType>{GetHostByNameActor::ResolverType::Native},
                       vector<GetHostByNameActor::ResolverType>{GetHostByNameActor::ResolverType::Google},
                       vector<GetHostByNameActor::ResolverType>{GetHostByNameActor::ResolverType::Google,
                                                                GetHostByNameActor::ResolverType::Google,
                                                                GetHostByNameActor::ResolverType::Native}}) {
      GetHostByNameActor::Options options;
      options.resolver_types = types;
      options.scheduler_id = threads_n;

      auto actor = create_actor<GetHostByNameActor>("GetHostByNameActor", std::move(options));
      auto actor_id = actor.get();
      actors.push_back(std::move(actor));

      for (auto host : hosts) {
        for (auto prefer_ipv6 : {false, true}) {
          bool allow_ok = host.size() > 2 && host[1] != '[';
          bool allow_both = host == "127.0.0.1." || host == "localhost" || (host == "москва.рф" && prefer_ipv6);
          bool allow_error = !allow_ok || allow_both;
          run(actor_id, host, prefer_ipv6, allow_ok, allow_error);
        }
      }
    }
  }
  cnt--;
  sched.start();
  while (sched.run_main(10)) {
    // empty
  }
  sched.finish();
}

TEST(Time, to_unix_time) {
  ASSERT_EQ(0, HttpDate::to_unix_time(1970, 1, 1, 0, 0, 0).move_as_ok());
  ASSERT_EQ(60 * 60 + 60 + 1, HttpDate::to_unix_time(1970, 1, 1, 1, 1, 1).move_as_ok());
  ASSERT_EQ(24 * 60 * 60, HttpDate::to_unix_time(1970, 1, 2, 0, 0, 0).move_as_ok());
  ASSERT_EQ(31 * 24 * 60 * 60, HttpDate::to_unix_time(1970, 2, 1, 0, 0, 0).move_as_ok());
  ASSERT_EQ(365 * 24 * 60 * 60, HttpDate::to_unix_time(1971, 1, 1, 0, 0, 0).move_as_ok());
  ASSERT_EQ(1562780559, HttpDate::to_unix_time(2019, 7, 10, 17, 42, 39).move_as_ok());
}

TEST(Time, parse_http_date) {
  ASSERT_EQ(784887151, HttpDate::parse_http_date("Tue, 15 Nov 1994 08:12:31 GMT").move_as_ok());
}

TEST(Mtproto, config) {
  ConcurrentScheduler sched;
  int threads_n = 0;
  sched.init(threads_n);

  int cnt = 1;
  {
    auto guard = sched.get_main_guard();

    auto run = [&](auto &func, bool is_test) {
      auto promise = PromiseCreator::lambda([&, num = cnt](Result<SimpleConfigResult> r_simple_config_result) {
        if (r_simple_config_result.is_ok()) {
          auto simple_config_result = r_simple_config_result.move_as_ok();
          auto date = simple_config_result.r_http_date.is_ok()
                          ? to_string(simple_config_result.r_http_date.ok())
                          : (PSTRING() << simple_config_result.r_http_date.error());
          auto config = simple_config_result.r_config.is_ok() ? to_string(simple_config_result.r_config.ok())
                                                              : (PSTRING() << simple_config_result.r_config.error());
          LOG(ERROR) << num << " " << date << " " << config;
        } else {
          LOG(ERROR) << num << " " << r_simple_config_result.error();
        }
        if (--cnt == 0) {
          Scheduler::instance()->finish();
        }
      });
      cnt++;
      func(std::move(promise), nullptr, is_test, -1).release();
    };

    run(get_simple_config_azure, false);
    run(get_simple_config_google_dns, false);
    run(get_simple_config_mozilla_dns, false);
    run(get_simple_config_azure, true);
    run(get_simple_config_google_dns, true);
    run(get_simple_config_mozilla_dns, true);
    run(get_simple_config_firebase_remote_config, false);
    run(get_simple_config_firebase_realtime, false);
    run(get_simple_config_firebase_firestore, false);
  }
  cnt--;
  if (cnt != 0) {
    sched.start();
    while (sched.run_main(10)) {
      // empty;
    }
    sched.finish();
  }
}

TEST(Mtproto, encrypted_config) {
  string data =
      "   hO//tt \b\n\tiwPVovorKtIYtQ8y2ik7CqfJiJ4pJOCLRa4fBmNPixuRPXnBFF/3mTAAZoSyHq4SNylGHz0Cv1/"
      "FnWWdEV+BPJeOTk+ARHcNkuJBt0CqnfcVCoDOpKqGyq0U31s2MOpQvHgAG+Tlpg02syuH0E4dCGRw5CbJPARiynteb9y5fT5x/"
      "kmdp6BMR5tWQSQF0liH16zLh8BDSIdiMsikdcwnAvBwdNhRqQBqGx9MTh62MDmlebjtczE9Gz0z5cscUO2yhzGdphgIy6SP+"
      "bwaqLWYF0XdPGjKLMUEJW+rou6fbL1t/EUXPtU0XmQAnO0Fh86h+AqDMOe30N4qKrPQ==   ";
  auto config = decode_config(data).move_as_ok();
}

class TestPingActor : public Actor {
 public:
  TestPingActor(IPAddress ip_address, Status *result) : ip_address_(ip_address), result_(result) {
  }

 private:
  IPAddress ip_address_;
  unique_ptr<mtproto::PingConnection> ping_connection_;
  Status *result_;
  bool is_inited_ = false;

  void start_up() override {
    auto r_socket = SocketFd::open(ip_address_);
    if (r_socket.is_error()) {
      LOG(ERROR) << "Failed to open socket: " << r_socket.error();
      return stop();
    }

    ping_connection_ = mtproto::PingConnection::create_req_pq(
        mtproto::RawConnection::create(ip_address_, r_socket.move_as_ok(),
                                       mtproto::TransportType{mtproto::TransportType::Tcp, 0, mtproto::ProxySecret()},
                                       nullptr),
        3);

    Scheduler::subscribe(ping_connection_->get_poll_info().extract_pollable_fd(this));
    is_inited_ = true;
    set_timeout_in(10);
    yield();
  }
  void tear_down() override {
    if (is_inited_) {
      Scheduler::unsubscribe_before_close(ping_connection_->get_poll_info().get_pollable_fd_ref());
    }
    Scheduler::instance()->finish();
  }

  void loop() override {
    auto status = ping_connection_->flush();
    if (status.is_error()) {
      *result_ = std::move(status);
      return stop();
    }
    if (ping_connection_->was_pong()) {
      LOG(INFO) << "GOT PONG";
      return stop();
    }
  }

  void timeout_expired() override {
    *result_ = Status::Error("Timeout expired");
    stop();
  }
};

static IPAddress get_default_ip_address() {
  IPAddress ip_address;
#if TD_EMSCRIPTEN
  ip_address.init_host_port("venus.web.telegram.org/apiws", 443).ensure();
#else
  ip_address.init_ipv4_port("149.154.167.40", 80).ensure();
#endif
  return ip_address;
}

static int32 get_default_dc_id() {
  return 10002;
}

class Mtproto_ping : public Test {
 public:
  using Test::Test;
  bool step() final {
    if (!is_inited_) {
      sched_.init(0);
      sched_.create_actor_unsafe<TestPingActor>(0, "Pinger", get_default_ip_address(), &result_).release();
      sched_.start();
      is_inited_ = true;
    }

    bool ret = sched_.run_main(10);
    if (ret) {
      return true;
    }
    sched_.finish();
    if (result_.is_error()) {
      LOG(ERROR) << result_;
    }
    return false;
  }

 private:
  bool is_inited_ = false;
  ConcurrentScheduler sched_;
  Status result_;
};
RegisterTest<Mtproto_ping> mtproto_ping("Mtproto_ping");

class HandshakeContext : public mtproto::AuthKeyHandshakeContext {
 public:
  DhCallback *get_dh_callback() override {
    return nullptr;
  }
  PublicRsaKeyInterface *get_public_rsa_key_interface() override {
    return &public_rsa_key;
  }

 private:
  PublicRsaKeyShared public_rsa_key{DcId::empty(), false};
};

class HandshakeTestActor : public Actor {
 public:
  HandshakeTestActor(int32 dc_id, Status *result) : dc_id_(dc_id), result_(result) {
  }

 private:
  int32 dc_id_ = 0;
  Status *result_;
  bool wait_for_raw_connection_ = false;
  unique_ptr<mtproto::RawConnection> raw_connection_;
  bool wait_for_handshake_ = false;
  unique_ptr<mtproto::AuthKeyHandshake> handshake_;
  Status status_;
  bool wait_for_result_ = false;

  void tear_down() override {
    if (raw_connection_) {
      raw_connection_->close();
    }
    finish(Status::Error("Interrupted"));
  }
  void loop() override {
    if (!wait_for_raw_connection_ && !raw_connection_) {
      auto ip_address = get_default_ip_address();
      auto r_socket = SocketFd::open(ip_address);
      if (r_socket.is_error()) {
        finish(Status::Error(PSTRING() << "Failed to open socket: " << r_socket.error()));
        return stop();
      }

      raw_connection_ = mtproto::RawConnection::create(
          ip_address, r_socket.move_as_ok(),
          mtproto::TransportType{mtproto::TransportType::Tcp, 0, mtproto::ProxySecret()}, nullptr);
    }
    if (!wait_for_handshake_ && !handshake_) {
      handshake_ = make_unique<mtproto::AuthKeyHandshake>(dc_id_, 3600);
    }
    if (raw_connection_ && handshake_) {
      if (wait_for_result_) {
        wait_for_result_ = false;
        if (status_.is_error()) {
          finish(std::move(status_));
          return stop();
        }
        if (!handshake_->is_ready_for_finish()) {
          finish(Status::Error("Key is not ready.."));
          return stop();
        }
        finish(Status::OK());
        return stop();
      }

      wait_for_result_ = true;
      create_actor<mtproto::HandshakeActor>(
          "HandshakeActor", std::move(handshake_), std::move(raw_connection_), make_unique<HandshakeContext>(), 10.0,
          PromiseCreator::lambda([self = actor_id(this)](Result<unique_ptr<mtproto::RawConnection>> raw_connection) {
            send_closure(self, &HandshakeTestActor::got_connection, std::move(raw_connection), 1);
          }),
          PromiseCreator::lambda([self = actor_id(this)](Result<unique_ptr<mtproto::AuthKeyHandshake>> handshake) {
            send_closure(self, &HandshakeTestActor::got_handshake, std::move(handshake), 1);
          }))
          .release();
      wait_for_raw_connection_ = true;
      wait_for_handshake_ = true;
    }
  }

  void got_connection(Result<unique_ptr<mtproto::RawConnection>> r_raw_connection, int32 dummy) {
    CHECK(wait_for_raw_connection_);
    wait_for_raw_connection_ = false;
    if (r_raw_connection.is_ok()) {
      raw_connection_ = r_raw_connection.move_as_ok();
      status_ = Status::OK();
    } else {
      status_ = r_raw_connection.move_as_error();
    }
    // TODO: save error
    loop();
  }

  void got_handshake(Result<unique_ptr<mtproto::AuthKeyHandshake>> r_handshake, int32 dummy) {
    CHECK(wait_for_handshake_);
    wait_for_handshake_ = false;
    CHECK(r_handshake.is_ok());
    handshake_ = r_handshake.move_as_ok();
    loop();
  }

  void finish(Status status) {
    if (!result_) {
      return;
    }
    *result_ = std::move(status);
    result_ = nullptr;
    Scheduler::instance()->finish();
  }
};

class Mtproto_handshake : public Test {
 public:
  using Test::Test;
  bool step() final {
    if (!is_inited_) {
      sched_.init(0);
      sched_.create_actor_unsafe<HandshakeTestActor>(0, "HandshakeTestActor", get_default_dc_id(), &result_).release();
      sched_.start();
      is_inited_ = true;
    }

    bool ret = sched_.run_main(10);
    if (ret) {
      return true;
    }
    sched_.finish();
    if (result_.is_error()) {
      LOG(ERROR) << result_;
    }
    return false;
  }

 private:
  bool is_inited_ = false;
  ConcurrentScheduler sched_;
  Status result_;
};
RegisterTest<Mtproto_handshake> mtproto_handshake("Mtproto_handshake");

class Socks5TestActor : public Actor {
 public:
  void start_up() override {
    auto promise = PromiseCreator::lambda([actor_id = actor_id(this)](Result<SocketFd> res) {
      send_closure(actor_id, &Socks5TestActor::on_result, std::move(res), false);
    });

    class Callback : public TransparentProxy::Callback {
     public:
      explicit Callback(Promise<SocketFd> promise) : promise_(std::move(promise)) {
      }
      void set_result(Result<SocketFd> result) override {
        promise_.set_result(std::move(result));
      }
      void on_connected() override {
      }

     private:
      Promise<SocketFd> promise_;
    };

    IPAddress socks5_ip;
    socks5_ip.init_ipv4_port("131.191.89.104", 43077).ensure();
    IPAddress mtproto_ip_address = get_default_ip_address();

    auto r_socket = SocketFd::open(socks5_ip);
    if (r_socket.is_error()) {
      return promise.set_error(Status::Error(PSTRING() << "Failed to open socket: " << r_socket.error()));
    }
    create_actor<Socks5>("socks5", r_socket.move_as_ok(), mtproto_ip_address, "", "",
                         make_unique<Callback>(std::move(promise)), actor_shared(this))
        .release();
  }

 private:
  void on_result(Result<SocketFd> res, bool dummy) {
    res.ensure();
    Scheduler::instance()->finish();
  }
};

TEST(Mtproto, socks5) {
  return;
  ConcurrentScheduler sched;
  int threads_n = 0;
  sched.init(threads_n);

  sched.create_actor_unsafe<Socks5TestActor>(0, "Socks5TestActor").release();
  sched.start();
  while (sched.run_main(10)) {
    // empty;
  }
  sched.finish();
}

TEST(Mtproto, notifications) {
  vector<string> pushes = {
      "eyJwIjoiSkRnQ3NMRWxEaWhyVWRRN1pYM3J1WVU4TlRBMFhMb0N6UWRNdzJ1cWlqMkdRbVR1WXVvYXhUeFJHaG1QQm8yVElYZFBzX2N3b2RIb3lY"
      "b2drVjM1dVl0UzdWeElNX1FNMDRKMG1mV3ZZWm4zbEtaVlJ0aFVBNGhYUWlaN0pfWDMyZDBLQUlEOWgzRnZwRjNXUFRHQWRaVkdFYzg3bnFPZ3hD"
      "NUNMRkM2SU9fZmVqcEpaV2RDRlhBWWpwc1k2aktrbVNRdFZ1MzE5ZW04UFVieXZudFpfdTNud2hjQ0czMk96TGp4S1kyS1lzU21JZm1GMzRmTmw1"
      "QUxaa2JvY2s2cE5rZEdrak9qYmRLckJyU0ZtWU8tQ0FsRE10dEplZFFnY1U5bVJQdU80b1d2NG5sb1VXS19zSlNTaXdIWEZyb1pWTnZTeFJ0Z1dN"
      "ZyJ9",
      "eyJwIjoiSkRnQ3NMRWxEaWlZby1GRWJndk9WaTFkUFdPVmZndzBBWHYwTWNzWDFhWEtNZC03T1Q2WWNfT0taRURHZDJsZ0h0WkhMSllyVG50RE95"
      "TkY1aXJRQlZ4UUFLQlRBekhPTGZIS3BhQXdoaWd5b3NQd0piWnJVV2xRWmh4eEozUFUzZjBNRTEwX0xNT0pFN0xsVUFaY2dabUNaX2V1QmNPZWNK"
      "VERxRkpIRGZjN2pBOWNrcFkyNmJRT2dPUEhCeHlEMUVrNVdQcFpLTnlBODVuYzQ1eHFPdERqcU5aVmFLU3pKb2VIcXBQMnJqR29kN2M5YkxsdGd5"
      "Q0NGd2NBU3dJeDc3QWNWVXY1UnVZIn0"};
  string key =
      "uBa5yu01a-nJJeqsR3yeqMs6fJLYXjecYzFcvS6jIwS3nefBIr95LWrTm-IbRBNDLrkISz1Sv0KYpDzhU8WFRk1D0V_"
      "qyO7XsbDPyrYxRBpGxofJUINSjb1uCxoSdoh1_F0UXEA2fWWKKVxL0DKUQssZfbVj3AbRglsWpH-jDK1oc6eBydRiS3i4j-"
      "H0yJkEMoKRgaF9NaYI4u26oIQ-Ez46kTVU-R7e3acdofOJKm7HIKan_5ZMg82Dvec2M6vc_"
      "I54Vs28iBx8IbBO1y5z9WSScgW3JCvFFKP2MXIu7Jow5-cpUx6jXdzwRUb9RDApwAFKi45zpv8eb3uPCDAmIQ";
  vector<string> decrypted_payloads = {
      "eyJsb2Nfa2V5IjoiTUVTU0FHRV9URVhUIiwibG9jX2FyZ3MiOlsiQXJzZW55IFNtaXJub3YiLCJhYmNkZWZnIl0sImN1c3RvbSI6eyJtc2dfaWQi"
      "OiI1OTAwNDciLCJmcm9tX2lkIjoiNjI4MTQifSwiYmFkZ2UiOiI0MDkifQ",
      "eyJsb2Nfa2V5IjoiIiwibG9jX2FyZ3MiOltdLCJjdXN0b20iOnsiY2hhbm5lbF9pZCI6IjExNzY4OTU0OTciLCJtYXhfaWQiOiIxMzU5In0sImJh"
      "ZGdlIjoiMCJ9"};
  key = base64url_decode(key).move_as_ok();

  for (size_t i = 0; i < pushes.size(); i++) {
    auto push = base64url_decode(pushes[i]).move_as_ok();
    auto decrypted_payload = base64url_decode(decrypted_payloads[i]).move_as_ok();

    auto key_id = DhHandshake::calc_key_id(key);
    ASSERT_EQ(key_id, NotificationManager::get_push_receiver_id(push).ok());
    ASSERT_EQ(decrypted_payload, NotificationManager::decrypt_push(key_id, key, push).ok());
  }
}

class FastPingTestActor : public Actor {
 public:
  explicit FastPingTestActor(Status *result) : result_(result) {
  }

 private:
  Status *result_;
  unique_ptr<mtproto::RawConnection> connection_;
  unique_ptr<mtproto::AuthKeyHandshake> handshake_;
  ActorOwn<> fast_ping_;
  int iteration_{0};

  void start_up() override {
    // Run handshake to create key and salt
    auto ip_address = get_default_ip_address();
    auto r_socket = SocketFd::open(ip_address);
    if (r_socket.is_error()) {
      *result_ = Status::Error(PSTRING() << "Failed to open socket: " << r_socket.error());
      return stop();
    }

    auto raw_connection = mtproto::RawConnection::create(
        ip_address, r_socket.move_as_ok(),
        mtproto::TransportType{mtproto::TransportType::Tcp, 0, mtproto::ProxySecret()}, nullptr);
    auto handshake = make_unique<mtproto::AuthKeyHandshake>(get_default_dc_id(), 60 * 100 /*temp*/);
    create_actor<mtproto::HandshakeActor>(
        "HandshakeActor", std::move(handshake), std::move(raw_connection), make_unique<HandshakeContext>(), 10.0,
        PromiseCreator::lambda([self = actor_id(this)](Result<unique_ptr<mtproto::RawConnection>> raw_connection) {
          send_closure(self, &FastPingTestActor::got_connection, std::move(raw_connection), 1);
        }),
        PromiseCreator::lambda([self = actor_id(this)](Result<unique_ptr<mtproto::AuthKeyHandshake>> handshake) {
          send_closure(self, &FastPingTestActor::got_handshake, std::move(handshake), 1);
        }))
        .release();
  }
  void got_connection(Result<unique_ptr<mtproto::RawConnection>> r_raw_connection, int32 dummy) {
    if (r_raw_connection.is_error()) {
      *result_ = r_raw_connection.move_as_error();
      LOG(INFO) << "Receive " << *result_ << " instead of a connection";
      return stop();
    }
    connection_ = r_raw_connection.move_as_ok();
    loop();
  }

  void got_handshake(Result<unique_ptr<mtproto::AuthKeyHandshake>> r_handshake, int32 dummy) {
    if (r_handshake.is_error()) {
      *result_ = r_handshake.move_as_error();
      LOG(INFO) << "Receive " << *result_ << " instead of a handshake";
      return stop();
    }
    handshake_ = r_handshake.move_as_ok();
    loop();
  }

  void got_raw_connection(Result<unique_ptr<mtproto::RawConnection>> r_connection) {
    if (r_connection.is_error()) {
      *result_ = r_connection.move_as_error();
      LOG(INFO) << "Receive " << *result_ << " instead of a handshake";
      return stop();
    }
    connection_ = r_connection.move_as_ok();
    LOG(INFO) << "RTT: " << connection_->extra().rtt;
    connection_->extra().rtt = 0;
    loop();
  }

  void loop() override {
    if (handshake_ && connection_) {
      LOG(INFO) << "Iteration " << iteration_;
      if (iteration_ == 6) {
        return stop();
      }
      unique_ptr<mtproto::AuthData> auth_data;
      if (iteration_ % 2 == 0) {
        auth_data = make_unique<mtproto::AuthData>();
        auth_data->set_tmp_auth_key(handshake_->get_auth_key());
        auth_data->set_server_time_difference(handshake_->get_server_time_diff());
        auth_data->set_server_salt(handshake_->get_server_salt(), Time::now());
        auth_data->set_future_salts({mtproto::ServerSalt{0u, 1e20, 1e30}}, Time::now());
        auth_data->set_use_pfs(true);
        uint64 session_id = 0;
        do {
          Random::secure_bytes(reinterpret_cast<uint8 *>(&session_id), sizeof(session_id));
        } while (session_id == 0);
        auth_data->set_session_id(session_id);
      }
      iteration_++;
      fast_ping_ = create_ping_actor(
          "", std::move(connection_), std::move(auth_data),
          PromiseCreator::lambda([self = actor_id(this)](Result<unique_ptr<mtproto::RawConnection>> r_raw_connection) {
            send_closure(self, &FastPingTestActor::got_raw_connection, std::move(r_raw_connection));
          }),
          ActorShared<>());
    }
  }

  void tear_down() override {
    Scheduler::instance()->finish();
  }
};

class Mtproto_FastPing : public Test {
 public:
  using Test::Test;
  bool step() final {
    if (!is_inited_) {
      sched_.init(0);
      sched_.create_actor_unsafe<FastPingTestActor>(0, "FastPingTestActor", &result_).release();
      sched_.start();
      is_inited_ = true;
    }

    bool ret = sched_.run_main(10);
    if (ret) {
      return true;
    }
    sched_.finish();
    if (result_.is_error()) {
      LOG(ERROR) << result_;
    }
    return false;
  }

 private:
  bool is_inited_ = false;
  ConcurrentScheduler sched_;
  Status result_;
};
RegisterTest<Mtproto_FastPing> mtproto_fastping("Mtproto_FastPing");

TEST(Mtproto, Grease) {
  std::string s(10000, '0');
  mtproto::Grease::init(s);
  for (auto c : s) {
    CHECK((c & 0xF) == 0xA);
  }
  for (size_t i = 1; i < s.size(); i += 2) {
    CHECK(s[i] != s[i - 1]);
  }
}

TEST(Mtproto, TlsTransport) {
  SET_VERBOSITY_LEVEL(VERBOSITY_NAME(ERROR));
  ConcurrentScheduler sched;
  int threads_n = 1;
  sched.init(threads_n);
  {
    auto guard = sched.get_main_guard();
    class RunTest : public Actor {
      void start_up() override {
        class Callback : public TransparentProxy::Callback {
         public:
          void set_result(Result<SocketFd> result) override {
            if (result.is_ok()) {
              LOG(ERROR) << "Unexpectedly succeeded to connect to MTProto proxy";
            } else if (result.error().message() != "Response hash mismatch") {
              LOG(ERROR) << "Receive unexpected result " << result.error();
            }
            Scheduler::instance()->finish();
          }
          void on_connected() override {
          }
        };

        const std::string domain = "www.google.com";
        IPAddress ip_address;
        auto resolve_status = ip_address.init_host_port(domain, 443);
        if (resolve_status.is_error()) {
          LOG(ERROR) << resolve_status;
          Scheduler::instance()->finish();
          return;
        }
        auto r_socket = SocketFd::open(ip_address);
        if (r_socket.is_error()) {
          LOG(ERROR) << "Failed to open socket: " << r_socket.error();
          Scheduler::instance()->finish();
          return;
        }
        create_actor<mtproto::TlsInit>("TlsInit", r_socket.move_as_ok(), domain, "0123456789secret",
                                       make_unique<Callback>(), ActorShared<>(), Clocks::system() - Time::now())
            .release();
      }
    };
    create_actor<RunTest>("RunTest").release();
  }

  sched.start();
  while (sched.run_main(10)) {
    // empty
  }
  sched.finish();
}

TEST(Mtproto, RSA) {
  auto pem = td::Slice(
      "-----BEGIN RSA PUBLIC KEY-----\n"
      "MIIBCgKCAQEAr4v4wxMDXIaMOh8bayF/NyoYdpcysn5EbjTIOZC0RkgzsRj3SGlu\n"
      "52QSz+ysO41dQAjpFLgxPVJoOlxXokaOq827IfW0bGCm0doT5hxtedu9UCQKbE8j\n"
      "lDOk+kWMXHPZFJKWRgKgTu9hcB3y3Vk+JFfLpq3d5ZB48B4bcwrRQnzkx5GhWOFX\n"
      "x73ZgjO93eoQ2b/lDyXxK4B4IS+hZhjzezPZTI5upTRbs5ljlApsddsHrKk6jJNj\n"
      "8Ygs/ps8e6ct82jLXbnndC9s8HjEvDvBPH9IPjv5JUlmHMBFZ5vFQIfbpo0u0+1P\n"
      "n6bkEi5o7/ifoyVv2pAZTRwppTz0EuXD8QIDAQAB\n"
      "-----END RSA PUBLIC KEY-----");
  auto rsa = RSA::from_pem_public_key(pem).move_as_ok();
  ASSERT_EQ(-7596991558377038078, rsa.get_fingerprint());
  ASSERT_EQ(256u, rsa.size());

  string s(255, '\0');
  string to(256, '\0');
  ASSERT_EQ(256u, rsa.encrypt(MutableSlice(s).ubegin(), 10, 255, MutableSlice(to).ubegin(), 256));
}