# Need to find OpenGL first as find_package(Qt5) tries to #include"GL/gl.h" on some platforms
find_package(OpenGL QUIET)

if (OPENGL_FOUND)
  find_package(Qt5 COMPONENTS Widgets Xml OpenGL QUIET)
  if (Qt5_FOUND)
    find_package(QGLViewer QUIET)
    if ( QGLVIEWER_FOUND)

      if (TARGET CGAL::CGAL)
        set(CMAKE_AUTOMOC ON)
        set(CMAKE_AUTOUIC ON)
        set(CMAKE_INCLUDE_CURRENT_DIR ON)

        SET(Boost_USE_STATIC_LIBS ON)
        SET(Boost_USE_MULTITHREAD OFF)
        include_directories (${QGLVIEWER_INCLUDE_DIR})

        add_executable  ( GudhUI
          gui/gudhui.cpp
          gui/MainWindow.cpp
          gui/Menu_k_nearest_neighbors.cpp
          gui/Menu_uniform_neighbors.cpp
          gui/Menu_edge_contraction.cpp
          gui/Menu_persistence.cpp
          view/Viewer_instructor.cpp
          view/Viewer.cpp
        )
        target_link_libraries( GudhUI CGAL::CGAL Qt5::Widgets Qt5::Xml Qt5::OpenGL )
        target_link_libraries( GudhUI ${QGLVIEWER_LIBRARIES} )
        target_link_libraries( GudhUI OpenGL::GL OpenGL::GLU )
        if(TARGET TBB::tbb)
          add_compile_definitions( QT_NO_EMIT )
          target_link_libraries( GudhUI TBB::tbb)
        endif()

        install(TARGETS GudhUI DESTINATION bin)
        set(GUDHI_MODULES ${GUDHI_MODULES} "GudhUI" CACHE INTERNAL "GUDHI_MODULES")
      else()
        message("++ GudhUI will not be compiled because CGAL < 5.1.0 or not found")
        set(GUDHI_MISSING_MODULES ${GUDHI_MISSING_MODULES} "GudhUI" CACHE INTERNAL "GUDHI_MISSING_MODULES")
      endif()
    else()
      message("++ GudhUI will not be compiled because QGLViewer is not found")
      set(GUDHI_MISSING_MODULES ${GUDHI_MISSING_MODULES} "GudhUI" CACHE INTERNAL "GUDHI_MISSING_MODULES")
    endif()
  else()
    message("++ GudhUI will not be compiled because Qt5 COMPONENTS Widgets Xml OpenGL are not found")
    set(GUDHI_MISSING_MODULES ${GUDHI_MISSING_MODULES} "GudhUI" CACHE INTERNAL "GUDHI_MISSING_MODULES")
  endif()
else()
  message("++ GudhUI will not be compiled because OpenGL is not found")
  set(GUDHI_MISSING_MODULES ${GUDHI_MISSING_MODULES} "GudhUI" CACHE INTERNAL "GUDHI_MISSING_MODULES")
endif()