# Make sure that the ExtProjName/IntProjName variables are unique globally
# even if other External_${ExtProjName}.cmake files are sourced by
# SlicerMacroCheckExternalProjectDependency
set(extProjName BOOST) #The find_package known name
set(proj        Boost) #This local name
set(${extProjName}_REQUIRED_VERSION "")  #If a required version is necessary, then set this, else leave blank

#if(${USE_SYSTEM_${extProjName}})
#  unset(${extProjName}_DIR CACHE)
#endif()

# Sanity checks
if(DEFINED ${extProjName}_DIR AND NOT EXISTS ${${extProjName}_DIR})
  message(FATAL_ERROR "${extProjName}_DIR variable is defined but corresponds to non-existing directory (${${extProjName}_DIR})")
endif()

# Set dependency list
set(${proj}_DEPENDENCIES "")
#if(${SUPERBUILD_TOPLEVEL_PROJECT}_BUILD_DICOM_SUPPORT)
#  list(APPEND ${proj}_DEPENDENCIES DCMTK)
#endif()

# Include dependent projects if any
ExternalProject_Include_Dependencies(${proj} PROJECT_VAR proj DEPENDS_VAR ${proj}_DEPENDENCIES)

if(NOT ( DEFINED "USE_SYSTEM_${extProjName}" AND "${USE_SYSTEM_${extProjName}}" ) )
  #message(STATUS "${__indent}Adding project ${proj}")

  ### --- Project specific additions here
  set(Boost_Install_Dir ${CMAKE_CURRENT_BINARY_DIR}/${proj}-install)
  set(Boost_Configure_Script ${CMAKE_CURRENT_LIST_DIR}/External_Boost_configureboost.cmake)
  set(Boost_Build_Script ${CMAKE_CURRENT_LIST_DIR}/External_Boost_buildboost.cmake)

  ### --- End Project specific additions
# SVN is too slow SVN_REPOSITORY http://svn.boost.org/svn/boost/trunk
# SVN is too slow SVN_REVISION -r "82586"
  set(${proj}_URL http://sourceforge.net/projects/boost/files/boost/1.66.0/boost_1.66_0.tar.gz )
  set(${proj}_MD5 5a5d5614d9a07672e1ab2a250b5defc5 )


  if(CMAKE_COMPILER_IS_CLANGXX)
    set(CLANG_ARG -DCMAKE_COMPILER_IS_CLANGXX:BOOL=ON)
  endif()
  set(BOOST_SOURCE_DIR ${SOURCE_DOWNLOAD_CACHE}/${proj})

  ### --- End Project specific additions
  set(${proj}_REPOSITORY "${git_protocol}://github.com/boostorg/boost.git")
  set(${proj}_GIT_TAG "boost-1.69.0") # Dec 12, 2018
  ExternalProject_Add(${proj}
    ${${proj}_EP_ARGS}
    GIT_REPOSITORY ${${proj}_REPOSITORY}
    GIT_TAG ${${proj}_GIT_TAG}
    SOURCE_DIR ${SOURCE_DOWNLOAD_CACHE}/${proj}
    #BINARY_DIR ${proj}-${EXTERNAL_PROJECT_BUILD_TYPE}-build
    BUILD_IN_SOURCE 1

    ${cmakeversion_external_update} "${cmakeversion_external_update_value}"
    CONFIGURE_COMMAND ${CMAKE_COMMAND}
                             ${CLANG_ARG}
                             -DBUILD_DIR:PATH=${CMAKE_CURRENT_BINARY_DIR}/${proj}
                             -DBOOST_INSTALL_DIR:PATH=${Boost_Install_Dir}
                             -P ${Boost_Configure_Script}
    INSTALL_COMMAND ""
    BUILD_COMMAND ${CMAKE_COMMAND}
                             -DBUILD_DIR:PATH=${CMAKE_CURRENT_BINARY_DIR}/Boost
                             -DBOOST_INSTALL_DIR:PATH=${Boost_Install_Dir} -P ${Boost_Build_Script}
  )
  set(BOOST_ROOT        ${BOOST_SOURCE_DIR})
  set(BOOST_INCLUDE_DIR ${BOOST_SOURCE_DIR})
else()
  if(${USE_SYSTEM_${extProjName}})
    find_package(${proj} ${${extProjName}_REQUIRED_VERSION} REQUIRED)
    message("USING the system ${extProjName}, set ${extProjName}_DIR=${${extProjName}_DIR}")
  endif()
  # The project is provided using ${extProjName}_DIR, nevertheless since other
  # project may depend on ${extProjName}, let's add an 'empty' one
  ExternalProject_Add_Empty(${proj} "${${proj}_DEPENDENCIES}")
endif()

mark_as_superbuild(
  VARS
    ${extProjName}_DIR:PATH
  LABELS
    "FIND_PACKAGE"
)