# Some functionnalities requires CMake 2.8.11 minimum
if (NOT CMAKE_VERSION VERSION_LESS 2.8.11)

  string(TIMESTAMP DATE_AND_TIME "%Y-%m-%d-%H-%M-%S")
  
  # Definition of the custom target user_version
  add_custom_target(user_version)
  
  if(DEFINED USER_VERSION_DIR)
    # set the GUDHI_USER_VERSION_DIR with USER_VERSION_DIR defined by the user
    set(GUDHI_USER_VERSION_DIR ${CMAKE_CURRENT_BINARY_DIR}/${USER_VERSION_DIR})
  else()
    # set the GUDHI_USER_VERSION_DIR with timestamp and Gudhi version number
    set(GUDHI_USER_VERSION_DIR ${CMAKE_CURRENT_BINARY_DIR}/${DATE_AND_TIME}_GUDHI_${GUDHI_VERSION})
  endif()

  set(GUDHI_DOXYGEN_DEPENDENCY user_version)

  add_custom_command(TARGET user_version PRE_BUILD COMMAND ${CMAKE_COMMAND} -E
                     make_directory ${GUDHI_USER_VERSION_DIR}
                     COMMENT "user_version creation in ${GUDHI_USER_VERSION_DIR}")
  
  add_custom_command(TARGET user_version PRE_BUILD COMMAND ${CMAKE_COMMAND} -E
                     copy ${CMAKE_SOURCE_DIR}/README ${GUDHI_USER_VERSION_DIR}/README)
  add_custom_command(TARGET user_version PRE_BUILD COMMAND ${CMAKE_COMMAND} -E
                     copy ${CMAKE_SOURCE_DIR}/COPYING ${GUDHI_USER_VERSION_DIR}/COPYING)
  add_custom_command(TARGET user_version PRE_BUILD COMMAND ${CMAKE_COMMAND} -E
                     copy ${CMAKE_SOURCE_DIR}/src/CMakeLists.txt ${GUDHI_USER_VERSION_DIR}/CMakeLists.txt)
  add_custom_command(TARGET user_version PRE_BUILD COMMAND ${CMAKE_COMMAND} -E
                     copy ${CMAKE_SOURCE_DIR}/src/Doxyfile ${GUDHI_USER_VERSION_DIR}/Doxyfile)
  add_custom_command(TARGET user_version PRE_BUILD COMMAND ${CMAKE_COMMAND} -E
                     copy ${CMAKE_SOURCE_DIR}/src/GUDHIConfigVersion.cmake.in ${GUDHI_USER_VERSION_DIR}/GUDHIConfigVersion.cmake.in)
  add_custom_command(TARGET user_version PRE_BUILD COMMAND ${CMAKE_COMMAND} -E
                     copy ${CMAKE_SOURCE_DIR}/src/GUDHIConfig.cmake.in ${GUDHI_USER_VERSION_DIR}/GUDHIConfig.cmake.in)
  add_custom_command(TARGET user_version PRE_BUILD COMMAND ${CMAKE_COMMAND} -E
                     copy ${CMAKE_SOURCE_DIR}/CMakeGUDHIVersion.txt ${GUDHI_USER_VERSION_DIR}/CMakeGUDHIVersion.txt)
  add_custom_command(TARGET user_version PRE_BUILD COMMAND ${CMAKE_COMMAND} -E
                     copy ${CMAKE_SOURCE_DIR}/GUDHIVersion.cmake.in ${GUDHI_USER_VERSION_DIR}/GUDHIVersion.cmake.in)
  
  add_custom_command(TARGET user_version PRE_BUILD COMMAND ${CMAKE_COMMAND} -E
                     copy_directory ${CMAKE_SOURCE_DIR}/biblio ${GUDHI_USER_VERSION_DIR}/biblio)
  add_custom_command(TARGET user_version PRE_BUILD COMMAND ${CMAKE_COMMAND} -E
                     copy_directory ${CMAKE_SOURCE_DIR}/data ${GUDHI_USER_VERSION_DIR}/data)
  add_custom_command(TARGET user_version PRE_BUILD COMMAND ${CMAKE_COMMAND} -E
                     copy_directory ${CMAKE_SOURCE_DIR}/src/cmake ${GUDHI_USER_VERSION_DIR}/cmake)
  add_custom_command(TARGET user_version PRE_BUILD COMMAND ${CMAKE_COMMAND} -E
                     copy_directory ${CMAKE_SOURCE_DIR}/src/debian ${GUDHI_USER_VERSION_DIR}/debian)
  add_custom_command(TARGET user_version PRE_BUILD COMMAND ${CMAKE_COMMAND} -E
                     copy_directory ${CMAKE_SOURCE_DIR}/src/GudhUI ${GUDHI_USER_VERSION_DIR}/GudhUI)
  
  set(GUDHI_MODULES "common;Alpha_complex;Bitmap_cubical_complex;Contraction;Hasse_complex;Persistent_cohomology;Simplex_tree;Skeleton_blocker;Witness_complex")
  
  foreach(GUDHI_MODULE ${GUDHI_MODULES})
    # doc files
    file(GLOB GUDHI_DOC_FILES ${CMAKE_SOURCE_DIR}/src/${GUDHI_MODULE}/doc/*)
  
    foreach(GUDHI_DOC_FILE ${GUDHI_DOC_FILES})
      get_filename_component(GUDHI_DOC_FILE_NAME ${GUDHI_DOC_FILE} NAME)
      # GUDHI_DOC_FILE can be a file or a directory
      if(IS_DIRECTORY ${GUDHI_DOC_FILE})
        add_custom_command(TARGET user_version PRE_BUILD COMMAND ${CMAKE_COMMAND} -E
                           copy_directory ${GUDHI_DOC_FILE} ${GUDHI_USER_VERSION_DIR}/doc/${GUDHI_MODULE}/${GUDHI_DOC_FILE_NAME})
      else()
        add_custom_command(TARGET user_version PRE_BUILD COMMAND ${CMAKE_COMMAND} -E
                           copy ${GUDHI_DOC_FILE} ${GUDHI_USER_VERSION_DIR}/doc/${GUDHI_MODULE}/${GUDHI_DOC_FILE_NAME})
      endif()
    endforeach()
  
    # example files
    file(GLOB GUDHI_EXAMPLE_FILES ${CMAKE_SOURCE_DIR}/src/${GUDHI_MODULE}/example/*)
  
    foreach(GUDHI_EXAMPLE_FILE ${GUDHI_EXAMPLE_FILES})
      get_filename_component(GUDHI_EXAMPLE_FILE_NAME ${GUDHI_EXAMPLE_FILE} NAME)
      # GUDHI_EXAMPLE_FILE can be a file or a directory
      if(IS_DIRECTORY ${GUDHI_EXAMPLE_FILE})
        add_custom_command(TARGET user_version PRE_BUILD COMMAND ${CMAKE_COMMAND} -E
                           copy_directory ${GUDHI_EXAMPLE_FILE} ${GUDHI_USER_VERSION_DIR}/example/${GUDHI_MODULE}/${GUDHI_EXAMPLE_FILE_NAME})
      else()
        add_custom_command(TARGET user_version PRE_BUILD COMMAND ${CMAKE_COMMAND} -E
                           copy ${GUDHI_EXAMPLE_FILE} ${GUDHI_USER_VERSION_DIR}/example/${GUDHI_MODULE}/${GUDHI_EXAMPLE_FILE_NAME})
      endif()
    endforeach()
  
    # include files
    file(GLOB GUDHI_INCLUDE_FILES ${CMAKE_SOURCE_DIR}/src/${GUDHI_MODULE}/include/gudhi/*)
  
    foreach(GUDHI_INCLUDE_FILE ${GUDHI_INCLUDE_FILES})
      get_filename_component(GUDHI_INCLUDE_FILE_NAME ${GUDHI_INCLUDE_FILE} NAME)
      # GUDHI_INCLUDE_FILE can be a file or a directory
      if(IS_DIRECTORY ${GUDHI_INCLUDE_FILE})
        add_custom_command(TARGET user_version PRE_BUILD COMMAND ${CMAKE_COMMAND} -E
                           copy_directory ${GUDHI_INCLUDE_FILE} ${GUDHI_USER_VERSION_DIR}/include/gudhi/${GUDHI_INCLUDE_FILE_NAME})
      else()
        add_custom_command(TARGET user_version PRE_BUILD COMMAND ${CMAKE_COMMAND} -E
                           copy ${GUDHI_INCLUDE_FILE} ${GUDHI_USER_VERSION_DIR}/include/gudhi/${GUDHI_INCLUDE_FILE_NAME})
      endif()
    endforeach()
  
    # concept files
    file(GLOB GUDHI_CONCEPT_FILES ${CMAKE_SOURCE_DIR}/src/${GUDHI_MODULE}/concept/*.h)
  
    foreach(GUDHI_CONCEPT_FILE ${GUDHI_CONCEPT_FILES})
      get_filename_component(GUDHI_CONCEPT_FILE_NAME ${GUDHI_CONCEPT_FILE} NAME)
      # GUDHI_CONCEPT_FILE can be a file or a directory
      if(IS_DIRECTORY ${GUDHI_CONCEPT_FILE})
        add_custom_command(TARGET user_version PRE_BUILD COMMAND ${CMAKE_COMMAND} -E
                           copy_directory ${GUDHI_CONCEPT_FILE} ${GUDHI_USER_VERSION_DIR}/concept/${GUDHI_MODULE}/${GUDHI_CONCEPT_FILE_NAME})
      else()
        add_custom_command(TARGET user_version PRE_BUILD COMMAND ${CMAKE_COMMAND} -E
                           copy ${GUDHI_CONCEPT_FILE} ${GUDHI_USER_VERSION_DIR}/concept/${GUDHI_MODULE}/${GUDHI_CONCEPT_FILE_NAME})
      endif()
    endforeach()
  endforeach()

endif()