// =================================================================================================
// This file is part of the CLBlast project. The project is licensed under Apache Version 2.0. This
// project loosely follows the Google C++ styleguide and uses a tab-size of two spaces and a max-
// width of 100 characters per line.
//
// Author(s):
//   Cedric Nugteren <www.cedricnugteren.nl>
//
// This file implements the Xdot class (see the header for information about the class).
//
// =================================================================================================

#include "internal/routines/level1/xdot.h"

#include <string>
#include <vector>

namespace clblast {
// =================================================================================================

// Specific implementations to get the memory-type based on a template argument
template <> const Precision Xdot<float>::precision_ = Precision::kSingle;
template <> const Precision Xdot<double>::precision_ = Precision::kDouble;
template <> const Precision Xdot<float2>::precision_ = Precision::kComplexSingle;
template <> const Precision Xdot<double2>::precision_ = Precision::kComplexDouble;

// =================================================================================================

// Constructor: forwards to base class constructor
template <typename T>
Xdot<T>::Xdot(Queue &queue, Event &event, const std::string &name):
    Routine<T>(queue, event, name, {"Xdot"}, precision_) {
  source_string_ =
    #include "../../kernels/level1/xdot.opencl"
  ;
}

// =================================================================================================

// The main routine
template <typename T>
StatusCode Xdot<T>::DoDot(const size_t n,
                          const Buffer<T> &dot_buffer, const size_t dot_offset,
                          const Buffer<T> &x_buffer, const size_t x_offset, const size_t x_inc,
                          const Buffer<T> &y_buffer, const size_t y_offset, const size_t y_inc,
                          const bool do_conjugate) {

  // Makes sure all dimensions are larger than zero
  if (n == 0) { return StatusCode::kInvalidDimension; }

  // Tests the vectors for validity
  auto status = TestVectorX(n, x_buffer, x_offset, x_inc, sizeof(T));
  if (ErrorIn(status)) { return status; }
  status = TestVectorY(n, y_buffer, y_offset, y_inc, sizeof(T));
  if (ErrorIn(status)) { return status; }
  status = TestVectorDot(1, dot_buffer, dot_offset, sizeof(T));
  if (ErrorIn(status)) { return status; }

  // Retrieves the Xdot kernels from the compiled binary
  try {
    auto& program = GetProgramFromCache();
    auto kernel1 = Kernel(program, "Xdot");
    auto kernel2 = Kernel(program, "XdotEpilogue");

    // Creates the buffer for intermediate values
    auto temp_size = 2*db_["WGS2"];
    auto temp_buffer = Buffer<T>(context_, temp_size);

    // Sets the kernel arguments
    kernel1.SetArgument(0, static_cast<int>(n));
    kernel1.SetArgument(1, x_buffer());
    kernel1.SetArgument(2, static_cast<int>(x_offset));
    kernel1.SetArgument(3, static_cast<int>(x_inc));
    kernel1.SetArgument(4, y_buffer());
    kernel1.SetArgument(5, static_cast<int>(y_offset));
    kernel1.SetArgument(6, static_cast<int>(y_inc));
    kernel1.SetArgument(7, temp_buffer());
    kernel1.SetArgument(8, static_cast<int>(do_conjugate));

    // Launches the main kernel
    auto global1 = std::vector<size_t>{db_["WGS1"]*temp_size};
    auto local1 = std::vector<size_t>{db_["WGS1"]};
    status = RunKernel(kernel1, global1, local1);
    if (ErrorIn(status)) { return status; }

    // Sets the arguments for the epilogue kernel
    kernel2.SetArgument(0, temp_buffer());
    kernel2.SetArgument(1, dot_buffer());
    kernel2.SetArgument(2, static_cast<int>(dot_offset));

    // Launches the epilogue kernel
    auto global2 = std::vector<size_t>{db_["WGS2"]};
    auto local2 = std::vector<size_t>{db_["WGS2"]};
    status = RunKernel(kernel2, global2, local2);
    if (ErrorIn(status)) { return status; }

    // Succesfully finished the computation
    return StatusCode::kSuccess;
  } catch (...) { return StatusCode::kInvalidKernel; }
}

// =================================================================================================

// Compiles the templated class
template class Xdot<float>;
template class Xdot<double>;
template class Xdot<float2>;
template class Xdot<double2>;

// =================================================================================================
} // namespace clblast