// Copyright (c) 2018, ETH Zurich and UNC Chapel Hill.
// All rights reserved.
//
// Redistribution and use in source and binary forms, with or without
// modification, are permitted provided that the following conditions are met:
//
//     * Redistributions of source code must retain the above copyright
//       notice, this list of conditions and the following disclaimer.
//
//     * Redistributions in binary form must reproduce the above copyright
//       notice, this list of conditions and the following disclaimer in the
//       documentation and/or other materials provided with the distribution.
//
//     * Neither the name of ETH Zurich and UNC Chapel Hill nor the names of
//       its contributors may be used to endorse or promote products derived
//       from this software without specific prior written permission.
//
// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
// AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
// IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
// ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDERS OR CONTRIBUTORS BE
// LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
// CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
// SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
// INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
// CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
// ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
// POSSIBILITY OF SUCH DAMAGE.
//
// Author: Johannes L. Schoenberger (jsch at inf.ethz.ch)

#include "util/cudacc.h"

#include "util/logging.h"

namespace colmap {

CudaTimer::CudaTimer() {
  CUDA_SAFE_CALL(cudaEventCreate(&start_));
  CUDA_SAFE_CALL(cudaEventCreate(&stop_));
  CUDA_SAFE_CALL(cudaEventRecord(start_, 0));
}

CudaTimer::~CudaTimer() {
  CUDA_SAFE_CALL(cudaEventDestroy(start_));
  CUDA_SAFE_CALL(cudaEventDestroy(stop_));
}

void CudaTimer::Print(const std::string& message) {
  CUDA_SAFE_CALL(cudaEventRecord(stop_, 0));
  CUDA_SAFE_CALL(cudaEventSynchronize(stop_));
  CUDA_SAFE_CALL(cudaEventElapsedTime(&elapsed_time_, start_, stop_));
  std::cout << StringPrintf("%s: %.4fs", message.c_str(),
                            elapsed_time_ / 1000.0f)
            << std::endl;
}

void CudaSafeCall(const cudaError_t error, const std::string& file,
                  const int line) {
  if (error != cudaSuccess) {
    std::cerr << StringPrintf("CUDA error at %s:%i - %s", file.c_str(), line,
                              cudaGetErrorString(error))
              << std::endl;
    exit(EXIT_FAILURE);
  }
}

void CudaCheck(const char* file, const int line) {
  const cudaError error = cudaGetLastError();
  while (error != cudaSuccess) {
    std::cerr << StringPrintf("CUDA error at %s:%i - %s", file, line,
                              cudaGetErrorString(error))
              << std::endl;
    exit(EXIT_FAILURE);
  }
}

void CudaSyncAndCheck(const char* file, const int line) {
  // Synchronizes the default stream which is a nullptr.
  const cudaError error = cudaStreamSynchronize(nullptr);
  if (cudaSuccess != error) {
    std::cerr << StringPrintf("CUDA error at %s:%i - %s", file, line,
                              cudaGetErrorString(error))
              << std::endl;
    std::cerr
        << "This error is likely caused by the graphics card timeout "
           "detection mechanism of your operating system. Please refer to "
           "the FAQ in the documentation on how to solve this problem."
        << std::endl;
    exit(EXIT_FAILURE);
  }
}

}  // namespace colmap
