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#include <algorithm>
#include <iostream>
#include <random>

#include <common.h>

#include "nanobench.h"

#undef GEMM

#ifndef COMPLEX
#ifdef DOUBLE
#define GEMM BLASFUNC(dgemm)
#elif defined(HALF)
#define GEMM BLASFUNC(sbgemm)
#else
#define GEMM BLASFUNC(sgemm)
#endif
#else
#ifdef DOUBLE
#define GEMM BLASFUNC(zgemm)
#else
#define GEMM BLASFUNC(cgemm)
#endif
#endif

template <typename T> static void fill_vector(std::vector<T> vec) {
  std::random_device rand_dev;
  std::mt19937 generator(rand_dev());
  std::uniform_real_distribution<T> distribution(std::numeric_limits<T>::min(),
                                                 std::numeric_limits<T>::max());

  std::generate(vec.begin(), vec.end(),
                [&]() { return distribution(generator); });
}

static std::pair<bool, std::string>
env_param(const std::string &name, const std::string &default_value) {
  const char *value = getenv(name.c_str());
  return {value == nullptr, value ? value : default_value};
}

static std::string env_value(const std::string &name,
                             const std::string &default_value) {
  return env_param(name, default_value).second;
}

int main(int argc, char *argv[]) {
  int from = (argc > 1) ? atol(argv[1]) : 1;
  int to = (argc > 2) ? MAX(atol(argv[2]), from) : 200;
  int step = (argc > 3) ? atol(argv[3]) : 1;

  FLOAT alpha[] = {1.0, 0.0};
  FLOAT beta[] = {0.0, 0.0};

  int epochs = atoi(env_value("OPENBLAS_EPOCHS", "1").c_str());
  bool json_output = env_value("OPENBLAS_OUTPUT_JSON", "0").front() == '1';

  std::pair<bool, std::string> param_m = env_param("OPENBLAS_PARAM_M", "100");
  std::pair<bool, std::string> param_n = env_param("OPENBLAS_PARAM_N", "100");
  std::pair<bool, std::string> param_k = env_param("OPENBLAS_PARAM_K", "100");
  blasint m = param_m.first ? atoi(param_m.second.c_str()) : to;
  blasint n = param_n.first ? atoi(param_n.second.c_str()) : to;
  blasint k = param_k.first ? atoi(param_k.second.c_str()) : to;

  char transpose = toupper(env_value("OPENBLAS_TRANS", "N").front());
  char transpose_a = toupper(env_value("OPENBLAS_TRANSA", "N").front());
  char transpose_b = toupper(env_value("OPENBLAS_TRANSB", "N").front());

  bool is_specific_size = param_m.first && param_n.first && param_k.first;
  if (is_specific_size) {
    from = 1;
    to = 1;
    step = 1;
  }

  std::vector<IFLOAT> a(m * k);
  std::vector<IFLOAT> b(n * k);
  std::vector<FLOAT> c(m * n);
  fill_vector(a);
  fill_vector(b);
  fill_vector(c);

  if (!is_specific_size) {
    std::cout << "From: " << std::to_string(from) << " To: " << std::to_string(to)
              << " Step: " << std::to_string(step) << " TransA: " << transpose_a
              << " TransB: " << transpose_b << "\n";
  } else {
    std::cout << "M: " << std::to_string(m) << " N: " << std::to_string(n)
              << " K: " << std::to_string(k) << " TransA: " << transpose_a
              << " TransB: " << transpose_b << "\n";
  }

  for (int i = from; i <= to; i += step) {
    if (!param_m.first) {
      m = i;
    }
    if (!param_n.first) {
      n = i;
    }
    if (!param_k.first) {
      k = i;
    }

    blasint lda = transpose == 'N' && transpose_a == 'N' ? m : k;
    blasint ldb = transpose == 'N' && transpose_b == 'N' ? k : n;
    blasint ldc = m;

    ankerl::nanobench::Bench bench;
    if (json_output) {
      bench.output(nullptr);
    }

    std::string bench_name = "M=" + std::to_string(m) +
                             " N=" + std::to_string(n) +
                             " K=" + std::to_string(k);
    bench.minEpochIterations(epochs).run(bench_name, [&]() {
      GEMM(&transpose_a, &transpose_b, &m, &n, &k, alpha, a.data(), &lda,
           b.data(), &ldb, beta, c.data(), &ldc);
    });
    if (json_output) {
      bench.render(ankerl::nanobench::templates::json(), std::cout);
    }
  }
}