//
// 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"

#include "td/utils/crypto.h"
#include "td/utils/logging.h"
#include "td/utils/port/thread.h"
#include "td/utils/Random.h"
#include "td/utils/Slice.h"
#include "td/utils/UInt.h"

#include <openssl/sha.h>

#include <array>
#include <atomic>
#include <cstdint>
#include <cstdlib>
#include <random>
#include <string>
#include <vector>

static constexpr int DATA_SIZE = 8 << 10;

class SHA1Bench : public td::Benchmark {
 public:
  alignas(64) unsigned char data[DATA_SIZE];

  std::string get_description() const override {
    return PSTRING() << "SHA1 OpenSSL [" << (DATA_SIZE >> 10) << "KB]";
  }

  void start_up() override {
    for (int i = 0; i < DATA_SIZE; i++) {
      data[i] = 123;
      data[i] = 0;
    }
  }

  void run(int n) override {
    for (int i = 0; i < n; i++) {
      unsigned char md[20];
      SHA1(data, DATA_SIZE, md);
    }
  }
};

class AESBench : public td::Benchmark {
 public:
  alignas(64) unsigned char data[DATA_SIZE];
  td::UInt256 key;
  td::UInt256 iv;

  std::string get_description() const override {
    return PSTRING() << "AES OpenSSL [" << (DATA_SIZE >> 10) << "KB]";
  }

  void start_up() override {
    for (int i = 0; i < DATA_SIZE; i++) {
      data[i] = 123;
    }
    td::Random::secure_bytes(key.raw, sizeof(key));
    td::Random::secure_bytes(iv.raw, sizeof(iv));
  }

  void run(int n) override {
    td::MutableSlice data_slice(data, DATA_SIZE);
    for (int i = 0; i < n; i++) {
      td::aes_ige_encrypt(key, &iv, data_slice, data_slice);
    }
  }
};

BENCH(Rand, "std_rand") {
  int res = 0;
  for (int i = 0; i < n; i++) {
    res ^= std::rand();
  }
  td::do_not_optimize_away(res);
}

BENCH(CppRand, "mt19937_rand") {
  std::uint_fast32_t res = 0;
  std::mt19937 g(123);
  for (int i = 0; i < n; i++) {
    res ^= g();
  }
  td::do_not_optimize_away(res);
}

BENCH(TdRand32, "td_rand_fast32") {
  td::uint32 res = 0;
  for (int i = 0; i < n; i++) {
    res ^= td::Random::fast_uint32();
  }
  td::do_not_optimize_away(res);
}

BENCH(TdRandFast, "td_rand_fast") {
  int res = 0;
  for (int i = 0; i < n; i++) {
    res ^= td::Random::fast(0, RAND_MAX);
  }
  td::do_not_optimize_away(res);
}

#if !TD_THREAD_UNSUPPORTED
BENCH(SslRand, "ssl_rand_int32") {
  std::vector<td::thread> v;
  std::atomic<td::uint32> sum;
  for (int i = 0; i < 3; i++) {
    v.push_back(td::thread([&] {
      td::int32 res = 0;
      for (int j = 0; j < n; j++) {
        res ^= td::Random::secure_int32();
      }
      sum += res;
    }));
  }
  for (auto &x : v) {
    x.join();
  }
  v.clear();
  td::do_not_optimize_away(sum.load());
}
#endif

BENCH(SslRandBuf, "ssl_rand_bytes") {
  td::int32 res = 0;
  std::array<td::int32, 1000> buf;
  for (int i = 0; i < n; i += static_cast<int>(buf.size())) {
    td::Random::secure_bytes(reinterpret_cast<td::uint8 *>(buf.data()), sizeof(buf[0]) * buf.size());
    for (auto x : buf) {
      res ^= x;
    }
  }
  td::do_not_optimize_away(res);
}

BENCH(Pbkdf2, "pbkdf2") {
  std::string password = "cucumber";
  std::string salt = "abcdefghijklmnopqrstuvw";
  std::string key(32, ' ');
  td::pbkdf2_sha256(password, salt, n, key);
}

class Crc32Bench : public td::Benchmark {
 public:
  alignas(64) unsigned char data[DATA_SIZE];

  std::string get_description() const override {
    return PSTRING() << "Crc32 zlib [" << (DATA_SIZE >> 10) << "KB]";
  }

  void start_up() override {
    for (int i = 0; i < DATA_SIZE; i++) {
      data[i] = 123;
      data[i] = 0;
    }
  }

  void run(int n) override {
    td::uint64 res = 0;
    for (int i = 0; i < n; i++) {
      res += td::crc32(td::Slice(data, DATA_SIZE));
    }
    td::do_not_optimize_away(res);
  }
};

class Crc64Bench : public td::Benchmark {
 public:
  alignas(64) unsigned char data[DATA_SIZE];

  std::string get_description() const override {
    return PSTRING() << "Crc64 Anton [" << (DATA_SIZE >> 10) << "KB]";
  }

  void start_up() override {
    for (int i = 0; i < DATA_SIZE; i++) {
      data[i] = 123;
      data[i] = 0;
    }
  }

  void run(int n) override {
    td::uint64 res = 0;
    for (int i = 0; i < n; i++) {
      res += td::crc64(td::Slice(data, DATA_SIZE));
    }
    td::do_not_optimize_away(res);
  }
};

int main() {
  td::bench(Pbkdf2Bench());
  td::bench(RandBench());
  td::bench(CppRandBench());
  td::bench(TdRand32Bench());
  td::bench(TdRandFastBench());
#if !TD_THREAD_UNSUPPORTED
  td::bench(SslRandBench());
#endif
  td::bench(SslRandBufBench());
  td::bench(SHA1Bench());
  td::bench(AESBench());
  td::bench(Crc32Bench());
  td::bench(Crc64Bench());
  return 0;
}
