// =================================================================================================
// 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 test utility functions.
//
// =================================================================================================

#include "test/test_utilities.hpp"

#include <string>
#include <vector>

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

// Returns whether a scalar is close to zero
template <typename T> bool IsCloseToZero(const T value) { return (value > -SmallConstant<T>()) && (value < SmallConstant<T>()); }
template bool IsCloseToZero<float>(const float);
template bool IsCloseToZero<double>(const double);
template <> bool IsCloseToZero(const half value) { return IsCloseToZero(HalfToFloat(value)); }
template <> bool IsCloseToZero(const float2 value) { return IsCloseToZero(value.real()) || IsCloseToZero(value.imag()); }
template <> bool IsCloseToZero(const double2 value) { return IsCloseToZero(value.real()) || IsCloseToZero(value.imag()); }

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

template <typename T, typename U>
void DeviceToHost(const Arguments<U> &args, Buffers<T> &buffers, BuffersHost<T> &buffers_host,
                  Queue &queue, const std::vector<std::string> &names) {
  for (auto &name: names) {
    if (name == kBufVecX) {buffers_host.x_vec = std::vector<T>(args.x_size, static_cast<T>(0)); buffers.x_vec.Read(queue, args.x_size, buffers_host.x_vec); }
    else if (name == kBufVecY) { buffers_host.y_vec = std::vector<T>(args.y_size, static_cast<T>(0)); buffers.y_vec.Read(queue, args.y_size, buffers_host.y_vec); }
    else if (name == kBufMatA) { buffers_host.a_mat = std::vector<T>(args.a_size, static_cast<T>(0)); buffers.a_mat.Read(queue, args.a_size, buffers_host.a_mat); }
    else if (name == kBufMatB) { buffers_host.b_mat = std::vector<T>(args.b_size, static_cast<T>(0)); buffers.b_mat.Read(queue, args.b_size, buffers_host.b_mat); }
    else if (name == kBufMatC) { buffers_host.c_mat = std::vector<T>(args.c_size, static_cast<T>(0)); buffers.c_mat.Read(queue, args.c_size, buffers_host.c_mat); }
    else if (name == kBufMatAP) { buffers_host.ap_mat = std::vector<T>(args.ap_size, static_cast<T>(0)); buffers.ap_mat.Read(queue, args.ap_size, buffers_host.ap_mat); }
    else if (name == kBufScalar) { buffers_host.scalar = std::vector<T>(args.scalar_size, static_cast<T>(0)); buffers.scalar.Read(queue, args.scalar_size, buffers_host.scalar); }
    else { throw std::runtime_error("Invalid buffer name"); }
  }
}

template <typename T, typename U>
void HostToDevice(const Arguments<U> &args, Buffers<T> &buffers, BuffersHost<T> &buffers_host,
                  Queue &queue, const std::vector<std::string> &names) {
  for (auto &name: names) {
    if (name == kBufVecX) { buffers.x_vec.Write(queue, args.x_size, buffers_host.x_vec); }
    else if (name == kBufVecY) { buffers.y_vec.Write(queue, args.y_size, buffers_host.y_vec); }
    else if (name == kBufMatA) { buffers.a_mat.Write(queue, args.a_size, buffers_host.a_mat); }
    else if (name == kBufMatB) { buffers.b_mat.Write(queue, args.b_size, buffers_host.b_mat); }
    else if (name == kBufMatC) { buffers.c_mat.Write(queue, args.c_size, buffers_host.c_mat); }
    else if (name == kBufMatAP) { buffers.ap_mat.Write(queue, args.ap_size, buffers_host.ap_mat); }
    else if (name == kBufScalar) { buffers.scalar.Write(queue, args.scalar_size, buffers_host.scalar); }
    else { throw std::runtime_error("Invalid buffer name"); }
  }
}

// Compiles the above functions
template void DeviceToHost(const Arguments<half>&, Buffers<half>&, BuffersHost<half>&, Queue&, const std::vector<std::string>&);
template void DeviceToHost(const Arguments<float>&, Buffers<float>&, BuffersHost<float>&, Queue&, const std::vector<std::string>&);
template void DeviceToHost(const Arguments<double>&, Buffers<double>&, BuffersHost<double>&, Queue&, const std::vector<std::string>&);
template void DeviceToHost(const Arguments<float>&, Buffers<float2>&, BuffersHost<float2>&, Queue&, const std::vector<std::string>&);
template void DeviceToHost(const Arguments<double>&, Buffers<double2>&, BuffersHost<double2>&, Queue&, const std::vector<std::string>&);
template void DeviceToHost(const Arguments<float2>&, Buffers<float2>&, BuffersHost<float2>&, Queue&, const std::vector<std::string>&);
template void DeviceToHost(const Arguments<double2>&, Buffers<double2>&, BuffersHost<double2>&, Queue&, const std::vector<std::string>&);
template void HostToDevice(const Arguments<half>&, Buffers<half>&, BuffersHost<half>&, Queue&, const std::vector<std::string>&);
template void HostToDevice(const Arguments<float>&, Buffers<float>&, BuffersHost<float>&, Queue&, const std::vector<std::string>&);
template void HostToDevice(const Arguments<double>&, Buffers<double>&, BuffersHost<double>&, Queue&, const std::vector<std::string>&);
template void HostToDevice(const Arguments<float>&, Buffers<float2>&, BuffersHost<float2>&, Queue&, const std::vector<std::string>&);
template void HostToDevice(const Arguments<double>&, Buffers<double2>&, BuffersHost<double2>&, Queue&, const std::vector<std::string>&);
template void HostToDevice(const Arguments<float2>&, Buffers<float2>&, BuffersHost<float2>&, Queue&, const std::vector<std::string>&);
template void HostToDevice(const Arguments<double2>&, Buffers<double2>&, BuffersHost<double2>&, Queue&, const std::vector<std::string>&);

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

// Conversion between half and single-precision
std::vector<float> HalfToFloatBuffer(const std::vector<half>& source) {
  auto result = std::vector<float>(source.size());
  for (auto i = size_t(0); i < source.size(); ++i) { result[i] = HalfToFloat(source[i]); }
  return result;
}
void FloatToHalfBuffer(std::vector<half>& result, const std::vector<float>& source) {
  for (auto i = size_t(0); i < source.size(); ++i) { result[i] = FloatToHalf(source[i]); }
}

// As above, but now for OpenCL data-types instead of std::vectors
#ifdef OPENCL_API
  Buffer<float> HalfToFloatBuffer(const Buffer<half>& source, RawCommandQueue queue_raw) {
    const auto size = source.GetSize() / sizeof(half);
    auto queue = Queue(queue_raw);
    auto context = queue.GetContext();
    auto source_cpu = std::vector<half>(size);
    source.Read(queue, size, source_cpu);
    auto result_cpu = HalfToFloatBuffer(source_cpu);
    auto result = Buffer<float>(context, size);
    result.Write(queue, size, result_cpu);
    return result;
  }
  void FloatToHalfBuffer(Buffer<half>& result, const Buffer<float>& source, RawCommandQueue queue_raw) {
    const auto size = source.GetSize() / sizeof(float);
    auto queue = Queue(queue_raw);
    auto context = queue.GetContext();
    auto source_cpu = std::vector<float>(size);
    source.Read(queue, size, source_cpu);
    auto result_cpu = std::vector<half>(size);
    FloatToHalfBuffer(result_cpu, source_cpu);
    result.Write(queue, size, result_cpu);
  }
#endif

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