include_guard(GLOBAL)


function(myx_cmake_doc_doxygen)
  set(DOXYGEN_FOUND AUTO CACHE STRING "Enable Doxygen documentation generator")
  set_property(CACHE DOXYGEN_FOUND PROPERTY STRINGS ON OFF AUTO)

  find_package(Doxygen)
  if(DOXYGEN_FOUND)
    set(DOXYGEN_FOUND ON CACHE STRING "Doxygen documentation generator enabled" FORCE)
  else()
    set(DOXYGEN_FOUND OFF CACHE STRING "Doxygen documentation generator disabled" FORCE)
  endif()

  set(_target "myx-cmake-doc-doxygen-${CMAKE_PROJECT_NAME}")
  if(NOT DOXYGEN_FOUND)
    message(STATUS "MyxCMake:")
    add_custom_target(${_target} VERBATIM COMMENT "  Doxygen is not found. Skipping target ${_target} build")
    return()
  endif()

  if(NOT TARGET ${_target})
    set(options)
    set(oneValueArgs SQLITE LATEX HTML LANGUAGE)
    set(multiValueArgs)
    cmake_parse_arguments(_arg "${options}" "${oneValueArgs}" "${multiValueArgs}" ${ARGN})

    set(GENERATE_XML YES)
    set(GENERATE_HTML NO)
    set(GENERATE_LATEX NO)
    set(DOXYGEN_OUTPUT_LANGUAGE Russian)
    if(_arg_HTML)
      set(GENERATE_HTML YES)
    endif()
    if(_arg_LATEX)
      set(GENERATE_LATEX YES)
    endif()
    if(_arg_LANGUAGE)
      set(DOXYGEN_OUTPUT_LANGUAGE ${_arg_LANGUAGE})
    endif()

    set(_myx_cmake_doxygen_in
"
PROJECT_NAME           = \"${DOXYGEN_PROJECT_TITLE}\"
OUTPUT_DIRECTORY       = \"${DOXYGEN_OUTPUT_DIRECTORY}\"
OUTPUT_LANGUAGE        = \"${DOXYGEN_OUTPUT_LANGUAGE}\"
STRIP_FROM_PATH        = \"${CMAKE_HOME_DIRECTORY}/src}\"
STRIP_FROM_INC_PATH    = \"${CMAKE_HOME_DIRECTORY}/src}\"

EXTRACT_ALL            = YES
EXTRACT_PRIVATE        = YES
EXTRACT_STATIC         = YES
EXTRACT_LOCAL_METHODS  = YES

INPUT                  = \"${CMAKE_HOME_DIRECTORY}/src\" \"${CMAKE_HOME_DIRECTORY}/doc/doxygen\"
RECURSIVE              = YES

CLANG_ASSISTED_PARSING = YES
CLANG_DATABASE_PATH    = \"${CMAKE_BINARY_DIR}\"

GENERATE_HTML          = ${GENERATE_HTML}
GENERATE_TREEVIEW      = YES

GENERATE_LATEX         = ${GENERATE_LATEX}
LATEX_CMD_NAME         = xelatex
COMPACT_LATEX          = YES

GENERATE_XML           = YES

UML_LOOK               = YES
TEMPLATE_RELATIONS     = YES
CALL_GRAPH             = YES
CALLER_GRAPH           = YES
INTERACTIVE_SVG        = YES
")

    set(_myx_cmake_doxygen_in_path ${CMAKE_CURRENT_BINARY_DIR}${CMAKE_FILES_DIRECTORY}/Doxygen.in)
    file(WRITE ${_myx_cmake_doxygen_in_path} ${_myx_cmake_doxygen_in})
    set(work_dir ${CMAKE_BINARY_DIR}/doc/doxygen)
    configure_file(${_myx_cmake_doxygen_in_path} ${work_dir}/Doxyfile @ONLY)

    add_custom_target(${_target}
      VERBATIM
      WORKING_DIRECTORY ${work_dir}
      COMMAND ${DOXYGEN_EXECUTABLE} ${work_dir}/Doxyfile
      COMMENT "Generating API documentation with Doxygen")
    if(_arg_HTML)
      install(DIRECTORY ${CMAKE_BINARY_DIR}/doc/doxygen/html/
              COMPONENT doc OPTIONAL
              DESTINATION ${CMAKE_INSTALL_DATADIR}/doc/doxygen)
    endif()
    if(NOT TARGET myx-cmake-doc-doxygen)
      add_custom_target(myx-cmake-doc-doxygen)
    endif()
    add_dependencies(myx-cmake-doc-doxygen ${_target})
  else()
    message(STATUS "MyxCMake: target ${_target} is already defined.")
  endif()
endfunction()