//
// Copyright Aliaksei Levin (levlam@telegram.org), Arseny Smirnov (arseny30@gmail.com) 2014-2018
//
// 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/utils/benchmark.h"  // for bench, do_not_optimize_away, etc

#include "td/mtproto/crypto.h"

#include "td/utils/base64.h"
#include "td/utils/logging.h"
#include "td/utils/Slice.h"

#include <map>

#if TD_LINUX || TD_ANDROID || TD_TIZEN
#include <semaphore.h>
#endif

namespace td {

static int32 g = 3;
static string prime_base64 =
    "xxyuucaxyQSObFIvcPE_c5gNQCOOPiHBSTTQN1Y9kw9IGYoKp8FAWCKUk9IlMPTb-jNvbgrJJROVQ67UTM58NyD9UfaUWHBaxozU_mtrE6vcl0ZRKW"
    "kyhFTxj6-MWV9kJHf-lrsqlB1bzR1KyMxJiAcI-ps3jjxPOpBgvuZ8-aSkppWBEFGQfhYnU7VrD2tBDbp02KhLKhSzFE4O8ShHVP0X7ZUNWWW0ud1G"
    "WC2xF40WnGvEZbDW_5yjko_vW5rk5Bj8Feg-vqD4f6n_Xu1wBQ3tKEn0e_lZ2VaFDOkphR8NgRX2NbEF7i5OFdBLJFS_b0-t8DSxBAMRnNjjuS_MW"
    "w";

class HandshakeBench : public Benchmark {
  std::string get_description() const override {
    return "Handshake";
  }

  class FakeDhCallback : public DhCallback {
   public:
    int is_good_prime(Slice prime_str) const override {
      auto it = cache.find(prime_str.str());
      if (it == cache.end()) {
        return -1;
      }
      return it->second;
    }
    void add_good_prime(Slice prime_str) const override {
      cache[prime_str.str()] = 1;
    }
    void add_bad_prime(Slice prime_str) const override {
      cache[prime_str.str()] = 0;
    }
    mutable std::map<string, int> cache;
  } dh_callback;

  void run(int n) override {
    DhHandshake a;
    DhHandshake b;
    auto prime = base64url_decode(prime_base64).move_as_ok();
    DhHandshake::check_config(g, prime, &dh_callback).ensure();
    for (int i = 0; i < n; i += 2) {
      a.set_config(g, prime);
      b.set_config(g, prime);
      b.set_g_a(a.get_g_b());
      a.set_g_a(b.get_g_b());
      a.run_checks(true, &dh_callback).ensure();
      b.run_checks(true, &dh_callback).ensure();
      auto a_key = a.gen_key();
      auto b_key = b.gen_key();
      CHECK(a_key.first == b_key.first);
    }
  }
};
}  // namespace td

int main() {
  SET_VERBOSITY_LEVEL(VERBOSITY_NAME(DEBUG));
  td::bench(td::HandshakeBench());
  return 0;
}
