#
# PythonQt
#

ctkMacroShouldAddExternalproject(PYTHONQT_LIBRARIES add_project)
if(${add_project})

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

  set(PythonQt_enabling_variable PYTHONQT_LIBRARIES)

  set(proj PythonQt)
  set(proj_DEPENDENCIES)

  list(APPEND CTK_DEPENDENCIES ${proj})

  set(${PythonQt_enabling_variable}_INCLUDE_DIRS PYTHONQT_INCLUDE_DIR PYTHON_INCLUDE_DIRS)
  set(${PythonQt_enabling_variable}_FIND_PACKAGE_CMD PythonQt)

  if(CTK_SUPERBUILD)

    if(NOT DEFINED PYTHONQT_INSTALL_DIR)
    #   message(STATUS "Adding project:${proj}")

      set(ep_PythonQt_args)

      # Should PythonQt use VTK
      if(CTK_LIB_Scripting/Python/Core_PYTHONQT_USE_VTK)
        list(APPEND proj_DEPENDENCIES VTK)
        list(APPEND ep_PythonQt_args -DVTK_DIR:PATH=${VTK_DIR})
      endif()
      list(APPEND ep_PythonQt_args -DPythonQt_USE_VTK:BOOL=${CTK_LIB_Scripting/Python/Core_PYTHONQT_USE_VTK})

      # Enable Qt libraries PythonQt wrapping if required
      foreach(qtlib core gui network opengl sql svg uitools webkit xml xmlpatterns)
        string(TOUPPER ${qtlib} qtlib_uppercase)
        list(APPEND ep_PythonQt_args -DPythonQt_Wrap_Qt${qtlib}:BOOL=${CTK_LIB_Scripting/Python/Core_PYTHONQT_WRAP_QT${qtlib_uppercase}})
      endforeach()

      # Python is required
      find_package(PythonLibs)
      if(NOT PYTHONLIBS_FOUND)
        message(FATAL_ERROR "error: Python is required to build ${PROJECT_NAME}")
      endif()

      set(revision_tag 5935f29978deed892a13ddef02cb14c205c6124d)
      if(${proj}_REVISION_TAG)
        set(revision_tag ${${proj}_REVISION_TAG})
      endif()
      
      set(location_args )
      if(${proj}_URL)
        set(location_args URL ${${proj}_URL})
      elseif(${proj}_GIT_REPOSITORY)
        set(location_args GIT_REPOSITORY ${${proj}_GIT_REPOSITORY}
                          GIT_TAG ${revision_tag})
      else()
        set(location_args GIT_REPOSITORY "${git_protocol}://github.com/commontk/PythonQt.git"
                          GIT_TAG ${revision_tag})
      endif()

      ExternalProject_Add(${proj}
        SOURCE_DIR ${CMAKE_BINARY_DIR}/${proj}
        BINARY_DIR ${proj}-build
        PREFIX ${proj}${ep_suffix}
        ${location_args}
        CMAKE_GENERATOR ${gen}
        UPDATE_COMMAND ""
        BUILD_COMMAND ""
        CMAKE_CACHE_ARGS
          ${ep_common_cache_args}
          -DQT_QMAKE_EXECUTABLE:FILEPATH=${QT_QMAKE_EXECUTABLE}
          -DPYTHON_INCLUDE_DIR:PATH=${PYTHON_INCLUDE_DIR}
          -DPYTHON_LIBRARY:FILEPATH=${PYTHON_LIBRARY}
          ${ep_PythonQt_args}
        DEPENDS
          ${proj_DEPENDENCIES}
        )
      set(PYTHONQT_INSTALL_DIR ${ep_install_dir})

      # Since the full path of PythonQt library is used, there is not need to add
      # its corresponding library output directory to CTK_EXTERNAL_LIBRARY_DIRS

    else()
      ctkMacroEmptyExternalproject(${proj} "${proj_DEPENDENCIES}")
    endif()

    list(APPEND CTK_SUPERBUILD_EP_VARS
      PYTHONQT_INSTALL_DIR:PATH
      PYTHON_EXECUTABLE:FILEPATH # FindPythonInterp expects PYTHON_EXECUTABLE variable to be defined
      PYTHON_INCLUDE_DIR:PATH # FindPythonQt expects PYTHON_INCLUDE_DIR variable to be defined
      PYTHON_LIBRARY:FILEPATH # FindPythonQt expects PYTHON_LIBRARY variable to be defined
      )

  endif()

endif()