#include <thread>
#include <random>
#include <vector>
#include <hpc/matvec/gematrix.h>
#include <hpc/matvec/apply.h>
#include <hpc/matvec/print.h>

template<typename MA>
typename std::enable_if<hpc::matvec::IsRealGeMatrix<MA>::value, void>::type
randomInit(MA& A) {
   using ElementType = typename MA::ElementType;
   using Index = typename MA::Index;

   std::random_device random;
   std::mt19937 mt(random());
   std::uniform_real_distribution<ElementType> uniform(-100,100);
   
   hpc::matvec::apply(A, [&](ElementType& val, Index i, Index j) -> void {
      val = uniform(mt);
   });
}

int main() {
   using namespace hpc::matvec;
   GeMatrix<double> A(51, 7);
   unsigned int nof_threads = std::thread::hardware_concurrency();

   std::vector<std::thread> threads(nof_threads);
   unsigned int job_size = A.numRows / nof_threads;
   unsigned int remainder = A.numRows % nof_threads;
   GeMatrix<double>::Index start = 0;
   for (int index = 0; index < nof_threads; ++index) {
      GeMatrix<double>::Index num_rows = job_size;
      if (index < remainder) ++num_rows;
      auto A_ = A(start, 0, num_rows, A.numCols);
      threads[index] = std::thread([=]() mutable { randomInit(A_); });
      start += num_rows;
   }
   for (int index = 0; index < nof_threads; ++index) {
      threads[index].join();
   }
   /* print a small block of each of the initialized matrices */
   print(A, "A");
}