#--- FindDKS ------------------------------------------------------------------
#
# This module defines:
#   DKS_INCLUDE_DIR, where to find DKSBaseMuSR.h
#   DKS_LIBS, shared library to be linked against if using DKS
#   DKS_CFLAGS, compiler flags needed for DKS
#
# **as35** since I currently also maintaing the DKS library, it should add
# a DKSConfig.cmake which eventually will make this module obsolate. This 
# means this module is only a kick starter.

find_path(DKS_INCLUDE_DIR DKSBaseMuSR.h
  HINTS "/usr/include" "/opt/local/include" "$ENV{HOME}/Apps/DKS/exec/include"
        "$ENV{HOME}/Applications/DKS/exec/include"
)

# find position of DKSBaseMuSR.h from the end
string(FIND "${DKS_INCLUDE_DIR}" "/DKSBaseMuSR.h" pos REVERSE)
# truncate the string
string(SUBSTRING "${DKS_INCLUDE_DIR}" 0 ${pos} substr)
set(DKS_INCLUDE_DIR ${substr})
unset(substr)

find_library(DKS_LIBRARY dksshared
  HINTS "/usr/lib" "/usr/lib64" "/opt/local/lib" "$ENV{HOME}/Apps/DKS/exec/lib"
        "$ENV{HOME}/Applications/DKS/exec/lib"
)

if (CUDA_FOUND)
  set(DKS_CFLAGS -DDKS_OPENCL -DDKS_CUDA -I${DKS_INCLUDE_DIR} -I${CUDA_INCLUDE_DIRS})
  set(DKS_LIBS ${CUDA_LIBRARIES} ${DKS_LIBRARY})
else (CUDA_FOUND)
  if (OpenCL_FOUND)
    if (APPLE)
      set(DKS_CFLAGS -DDKS_OPENCL -I${DKS_INCLUDE_DIR} -I${OpenCL_INCLUDE_DIRS})
      set(DKS_LIBS ${OpenCL_LIBRARY} ${DKS_LIBRARY})
    else (APPLE)
      set(DKS_CFLAGS -DDKS_OPENCL -I${DKS_INCLUDE_DIR} -I${OpenCL_INCLUDE_DIRS})
      set(DKS_LIBS ${OpenCL_LIBRARY} ${DKS_LIBRARY})
    endif (APPLE)
  else (OpenCL_FOUND)
    message(FATAL "neither CUDA nor OpenCL found when looking for DKS.")
  endif (OpenCL_FOUND)
endif (CUDA_FOUND)

# as35 set here the DKS version explicitly. This is VERY ugly and should be fixed
#      asap by using a package
set(DKS_VERSION "1.1.3")

# handle the QUIETLY and REQUIRED arguments and set DKS_FOUND to TRUE if
# all listed variables are TRUE
include(${CMAKE_ROOT}/Modules/FindPackageHandleStandardArgs.cmake)
find_package_handle_standard_args(DKS
                                  REQUIRED_VARS DKS_CFLAGS DKS_LIBS DKS_INCLUDE_DIR
                                  VERSION_VAR DKS_VERSION)

if (NOT DKS_FOUND)
  unset(DKS_CFLAGS)
  unset(DKS_LIBS)
endif (NOT DKS_FOUND)

mark_as_advanced(
  DKS_INCLUDE_DIR
  DKS_CFLAGS 
  DKS_LIBS
)