include (ExternalProject)

set(highwayhash_INCLUDE_DIR ${CMAKE_CURRENT_BINARY_DIR}/external/highwayhash)
set(highwayhash_URL https://github.com/google/highwayhash.git)
set(highwayhash_TAG be5edafc2e1a455768e260ccd68ae7317b6690ee)
set(highwayhash_BUILD ${CMAKE_CURRENT_BINARY_DIR}/highwayhash/src/highwayhash)
set(highwayhash_INSTALL ${CMAKE_CURRENT_BINARY_DIR}/highwayhash/install)

# put highwayhash includes in the directory where they are expected
add_custom_target(highwayhash_create_destination_dir
    COMMAND ${CMAKE_COMMAND} -E make_directory ${highwayhash_INCLUDE_DIR}/highwayhash
    DEPENDS highwayhash)

add_custom_target(highwayhash_copy_headers_to_destination
    DEPENDS highwayhash_create_destination_dir)

if(WIN32)
  set(highwayhash_HEADERS "${highwayhash_BUILD}/highwayhash/*.h")
  set(highwayhash_STATIC_LIBRARIES ${highwayhash_INSTALL}/lib/highwayhash.lib)
else()
  set(highwayhash_HEADERS "${highwayhash_BUILD}/highwayhash/*.h")
  set(highwayhash_STATIC_LIBRARIES ${highwayhash_INSTALL}/lib/libhighwayhash.a)
endif()

ExternalProject_Add(highwayhash
    PREFIX highwayhash
    GIT_REPOSITORY ${highwayhash_URL}
    GIT_TAG ${highwayhash_TAG}
    DOWNLOAD_DIR "${DOWNLOAD_LOCATION}"
    BUILD_IN_SOURCE 1
    PATCH_COMMAND ${CMAKE_COMMAND} -E copy_if_different ${CMAKE_CURRENT_SOURCE_DIR}/patches/highwayhash/CMakeLists.txt ${highwayhash_BUILD}
    INSTALL_DIR ${highwayhash_INSTALL}
    CMAKE_CACHE_ARGS
        -DCMAKE_BUILD_TYPE:STRING=Release
        -DCMAKE_VERBOSE_MAKEFILE:BOOL=OFF
        -DCMAKE_INSTALL_PREFIX:STRING=${highwayhash_INSTALL})

add_custom_command(TARGET highwayhash_copy_headers_to_destination PRE_BUILD
    COMMAND ${CMAKE_COMMAND} -E copy_directory ${highwayhash_INSTALL}/include/ ${highwayhash_INCLUDE_DIR}/highwayhash)
