cmake_minimum_required(VERSION 3.5.0)
find_package(Git REQUIRED)
include(ExternalProject)


#####
# \breif Function used to add UnitTest++ as an External Project, install it into the 
#        binary location of the CMake build, add its header directories in the 
#        include_directories, and finally add the built static library as an imported 
#        CMake target
#####
function (add_unittest_cpp)

  set(UTPP_INSATLL_DIR "${CMAKE_CURRENT_BINARY_DIR}/unittest++/install")
  if (WIN32)
    set(UTPP_LIB_NAME "UnitTest++.lib")
  else()
    set(UTPP_LIB_NAME "libUnitTest++.a")
  endif()


  ExternalProject_Add(unittest-cpp
    GIT_REPOSITORY          https://github.com/unittest-cpp/unittest-cpp.git
    GIT_TAG                 v2.0.0
	  GIT_SHALLOW		          TRUE # Don't require downloading the entire history
    SOURCE_DIR		          "${CMAKE_CURRENT_BINARY_DIR}/unittest++/src"
    INSTALL_DIR		          "${UTPP_INSATLL_DIR}"
    CMAKE_ARGS		          -DCMAKE_INSTALL_PREFIX=<INSTALL_DIR>
    TEST_EXCLUDE_FROM_MAIN  TRUE # Don't run UnitTest++'s tests by default
  )
  
  set(UTPP_INCLUDE_DIRS "${UTPP_INSATLL_DIR}/include" PARENT_SCOPE)
  add_library(UnitTest++ STATIC IMPORTED)
  set_target_properties(UnitTest++ PROPERTIES IMPORTED_LOCATION "${UTPP_INSATLL_DIR}/lib/${UTPP_LIB_NAME}" )
  # Require the ExternalProject target to complete before importing the library
  add_dependencies(UnitTest++ unittest-cpp)

endfunction(add_unittest_cpp)