# Copyright (c) 2017, ArrayFire
# All rights reserved.
#
# This file is distributed under 3-clause BSD license.
# The complete license agreement can be obtained at:
# http://arrayfire.com/licenses/BSD-3-Clause

if(TARGET clblast OR AF_WITH_EXTERNAL_PACKAGES_ONLY)
  if(TARGET clblast)
    # CLBlast has a broken imported link interface where it lists
    # the full path to the OpenCL library. OpenCL is imported by
    # another package so we dont need this property to link against
    # CLBlast.
    set_target_properties(clblast PROPERTIES
      IMPORTED_LINK_INTERFACE_LIBRARIES_RELEASE ""
      IMPORTED_LINK_INTERFACE_LIBRARIES_DEBUG "")

    if(WIN32 AND VCPKG_ROOT)
      set_target_properties(clblast PROPERTIES
        IMPORTED_LOCATION_RELEASE ""
        IMPORTED_LOCATION_DEBUG "")
    endif()
  else()
    message(ERROR "CLBlast now found")
  endif()
else()
  # This specific reference passes tests
  af_dep_check_and_populate(${clblast_prefix}
    URI https://github.com/cnugteren/CLBlast.git
    REF 4500a03440e2cc54998c0edab366babf5e504d67
  )

  include(ExternalProject)
  find_program(GIT git)

  set(prefix ${PROJECT_BINARY_DIR}/third_party/CLBlast)
  set(CLBlast_libname ${CMAKE_STATIC_LIBRARY_PREFIX}clblast${CMAKE_STATIC_LIBRARY_SUFFIX})
  set(CLBlast_location ${${clblast_prefix}_BINARY_DIR}/pkg/lib/${CLBlast_libname})

  set(extproj_gen_opts "-G${CMAKE_GENERATOR}")
  if(WIN32 AND CMAKE_GENERATOR_PLATFORM AND NOT CMAKE_GENERATOR MATCHES "Ninja")
    list(APPEND extproj_gen_opts "-A${CMAKE_GENERATOR_PLATFORM}")
    if(CMAKE_GENERATOR_TOOLSET)
      list(APPEND extproj_gen_opts "-T${CMAKE_GENERATOR_TOOLSET}")
    endif()
  endif()
  if(VCPKG_TARGET_TRIPLET)
    list(APPEND extproj_gen_opts "-DOPENCL_ROOT:PATH=${_VCPKG_INSTALLED_DIR}/${VCPKG_TARGET_TRIPLET}")
  endif()

  set(extproj_build_type_option "")
  if(NOT isMultiConfig)
    if("${CMAKE_BUILD_TYPE}" MATCHES "Release|RelWithDebInfo")
      set(extproj_build_type "Release")
    else()
      set(extproj_build_type ${CMAKE_BUILD_TYPE})
    endif()
    set(extproj_build_type_option "-DCMAKE_BUILD_TYPE:STRING=${extproj_build_type}")
  endif()

  ExternalProject_Add(
      CLBlast-ext
      DOWNLOAD_COMMAND ""
      UPDATE_COMMAND ""
      PATCH_COMMAND ""
      SOURCE_DIR "${${clblast_prefix}_SOURCE_DIR}"
      BINARY_DIR "${${clblast_prefix}_BINARY_DIR}"
      PREFIX "${prefix}"
      INSTALL_DIR "${${clblast_prefix}_BINARY_DIR}/pkg"
      BUILD_BYPRODUCTS ${CLBlast_location}
      CONFIGURE_COMMAND ${CMAKE_COMMAND} ${extproj_gen_opts}
        -Wno-dev <SOURCE_DIR>
        -DCMAKE_POLICY_VERSION_MINIMUM=3.5
        -DCMAKE_CXX_COMPILER:FILEPATH=${CMAKE_CXX_COMPILER}
        "-DCMAKE_CXX_FLAGS:STRING=${CMAKE_CXX_FLAGS}"
        -DOVERRIDE_MSVC_FLAGS_TO_MT:BOOL=OFF
        -DCMAKE_C_COMPILER:FILEPATH=${CMAKE_C_COMPILER}
        "-DCMAKE_C_FLAGS:STRING=${CMAKE_C_FLAGS}"
        -DCMAKE_POSITION_INDEPENDENT_CODE=ON
        -DOPENCL_LIBRARIES="${OPENCL_LIBRARIES}"
        ${extproj_build_type_option}
        -DCMAKE_INSTALL_PREFIX:PATH=<INSTALL_DIR>
        -DCMAKE_INSTALL_LIBDIR:PATH=lib
        -DBUILD_SHARED_LIBS:BOOL=OFF
        -DSAMPLES:BOOL=OFF
        -DTUNERS:BOOL=OFF
        -DCLIENTS:BOOL=OFF
        -DTESTS:BOOL=OFF
        -DNETLIB:BOOL=OFF
      )

  set(CLBLAST_INCLUDE_DIRS "${${clblast_prefix}_BINARY_DIR}/pkg/include")
  set(CLBLAST_LIBRARIES CLBlast)
  set(CLBLAST_FOUND ON)

  make_directory("${CLBLAST_INCLUDE_DIRS}")

  add_library(clblast UNKNOWN IMPORTED)
  set_target_properties(clblast PROPERTIES
    IMPORTED_LOCATION "${CLBlast_location}"
    INTERFACE_INCLUDE_DIRECTORIES "${CLBLAST_INCLUDE_DIRS}")

  add_dependencies(clblast CLBlast-ext)
endif()