cmake_minimum_required(VERSION 3.15)
project(CudaOnlyToolkit LANGUAGES CUDA)
find_package(CUDAToolkit REQUIRED)

if(NOT DEFINED CUDAToolkit_VERSION)
  message(FATAL_ERROR "expected CUDAToolkit variable CUDAToolkit_VERSION not found")
endif()

message(STATUS "CUDAToolkit_VERSION: ${CUDAToolkit_VERSION}")
message(STATUS "CUDAToolkit_VERSION_MAJOR: ${CUDAToolkit_VERSION_MAJOR}")
message(STATUS "CUDAToolkit_VERSION_MINOR: ${CUDAToolkit_VERSION_MINOR}")
message(STATUS "CUDAToolkit_VERSION_PATCH: ${CUDAToolkit_VERSION_PATCH}")
message(STATUS "CUDAToolkit_BIN_DIR: ${CUDAToolkit_BIN_DIR}")
message(STATUS "CUDAToolkit_INCLUDE_DIRS: ${CUDAToolkit_INCLUDE_DIRS}")
message(STATUS "CUDAToolkit_LIBRARY_DIR: ${CUDAToolkit_LIBRARY_DIR}")
message(STATUS "CUDAToolkit_LIBRARY_ROOT: ${CUDAToolkit_LIBRARY_ROOT}")
message(STATUS "CUDAToolkit_NVCC_EXECUTABLE ${CUDAToolkit_NVCC_EXECUTABLE}")

set(should_exist
  CUDAToolkit_BIN_DIR
  CUDAToolkit_INCLUDE_DIRS
  CUDAToolkit_LIBRARY_DIR
  CUDAToolkit_LIBRARY_ROOT
  )
foreach (cuda_loc_var IN LISTS should_exist)
  foreach (entry IN LISTS ${cuda_loc_var})
    if(NOT EXISTS "${entry}")
      message(FATAL_ERROR "${cuda_loc_var}[${entry}] variable is expected to be set to valid path")
    endif()
  endforeach()
endforeach()

set(cuda_libs cudart cuda_driver cublas cufft cufftw curand cusolver cusparse)
if(CUDAToolkit_VERSION VERSION_GREATER_EQUAL 10.1)
  list(APPEND cuda_libs cublasLt)
endif()
if(CUDAToolkit_VERSION_MAJOR VERSION_GREATER 11)
  list(APPEND cuda_libs nvJitLink)
endif()
if(CUDAToolkit_VERSION_MAJOR VERSION_LESS 11)
  list(APPEND cuda_libs nvgraph)
endif()

# Verify that all the CUDA:: targets and variables exist
foreach (cuda_lib IN LISTS cuda_libs)
  if(NOT CUDA_${cuda_lib}_LIBRARY)
    message(FATAL_ERROR "expected CUDAToolkit variable CUDA_${cuda_lib}_LIBRARY not found")
  elseif(CUDA_${cuda_lib}_LIBRARY MATCHES [[\.\./]])
    message(FATAL_ERROR "expected CUDAToolkit variable CUDA_${cuda_lib}_LIBRARY[\"${CUDA_${cuda_lib}_LIBRARY}\"] to not contain /..")
  endif()
  if(NOT TARGET CUDA::${cuda_lib})
    message(FATAL_ERROR "expected CUDAToolkit target CUDA::${cuda_lib} not found")
  endif()
endforeach()

set(npp_libs nppc nppial nppicc nppidei nppif nppig nppim nppist nppitc npps nppisu)
if(CUDAToolkit_VERSION_MAJOR VERSION_LESS 11)
  list(APPEND npp_libs nppicom)
endif()
foreach (cuda_lib IN LISTS npp_libs)
  if(NOT CUDA_${cuda_lib}_LIBRARY)
    message(FATAL_ERROR "expected CUDAToolkit variable CUDA_${cuda_lib}_LIBRARY not found")
  elseif(CUDA_${cuda_lib}_LIBRARY MATCHES [[\.\./]])
    message(FATAL_ERROR "expected CUDAToolkit variable CUDA_${cuda_lib}_LIBRARY[\"${CUDA_${cuda_lib}_LIBRARY}\"] to not contain /..")
  endif()
  if(NOT TARGET CUDA::${cuda_lib})
    message(FATAL_ERROR "expected CUDAToolkit target CUDA::${cuda_lib} not found")
  endif()
endforeach()

set(nv_libs nvrtc OpenCL)
if(CUDAToolkit_VERSION_MAJOR VERSION_LESS 12)
  list(APPEND nv_libs nvToolsExt)
endif()
foreach (cuda_lib IN LISTS nv_libs)
  if(NOT CUDA_${cuda_lib}_LIBRARY)
    message(FATAL_ERROR "expected CUDAToolkit variable CUDA_${cuda_lib}_LIBRARY not found")
  elseif(CUDA_${cuda_lib}_LIBRARY MATCHES [[\.\./]])
    message(FATAL_ERROR "expected CUDAToolkit variable CUDA_${cuda_lib}_LIBRARY[\"${CUDA_${cuda_lib}_LIBRARY}\"] to not contain /..")
  endif()

  if(NOT TARGET CUDA::${cuda_lib})
    message(FATAL_ERROR "expected CUDAToolkit target CUDA::${cuda_lib} not found")
  endif()
endforeach()

if(HAS_CUPTI)
  set(cupti_libs )
  if(CUDAToolkit_VERSION VERSION_GREATER_EQUAL 10.2)
    list(APPEND cupti_libs cupti nvperf_target)
  endif()
  if(CUDAToolkit_VERSION VERSION_GREATER_EQUAL 11.3)
    list(APPEND cupti_libs pcsamplingutil)
  endif()

  foreach (cuda_lib IN LISTS cupti_libs)
    if(NOT CUDA_${cuda_lib}_LIBRARY)
      message(FATAL_ERROR "expected CUDAToolkit variable CUDA_${cuda_lib}_LIBRARY not found")
    endif()
    if(NOT TARGET CUDA::${cuda_lib})
      message(FATAL_ERROR "expected CUDAToolkit target CUDA::${cuda_lib} not found")
    endif()
  endforeach()
endif()

add_executable(CudaOnlyToolkit main.cu)
target_link_libraries(CudaOnlyToolkit PRIVATE CUDA::toolkit)