include_guard()

find_program(GLIB_MKENUMS_BIN
  NAMES "glib-mkenums"
  REQUIRED
)

function(target_add_glib_enums TARGET)
  set(SINGLE_VALUE_ARGS
    "HEADER_TEMPLATE"
    "OUTPUT_NAME"
    "SOURCE_TEMPLATE"
  )
  set(MULTI_VALUE_ARGS "HEADERS")
  cmake_parse_arguments(
    PARSE_ARGV 1
    ""
    "${OPTIONS}"
    "${SINGLE_VALUE_ARGS}"
    "${MULTI_VALUE_ARGS}"
  )

  if(NOT TARGET "${TARGET}")
    message(FATAL_ERROR "Target '${TARGET}' does not exist")
  endif()

  if(NOT _HEADERS)
    message(FATAL_ERROR "Missing enum headers")
  endif()

  if(NOT _HEADER_TEMPLATE OR NOT _SOURCE_TEMPLATE)
    message(FATAL_ERROR "Missing templates")
  endif()

    if(NOT _OUTPUT_NAME)
    message(FATAL_ERROR "Missing output name")
  endif()

  set(SOURCE_FILE "${CMAKE_CURRENT_SOURCE_DIR}/src/${_OUTPUT_NAME}.c")
  set(HEADER_FILE "${CMAKE_CURRENT_SOURCE_DIR}/src/${_OUTPUT_NAME}.h")

  add_custom_command(OUTPUT
    ${SOURCE_FILE}
    ${HEADER_FILE}
    WORKING_DIRECTORY "${CMAKE_CURRENT_SOURCE_DIR}"
    COMMAND "${GLIB_MKENUMS_BIN}"
    ARGS
    "--template=${_SOURCE_TEMPLATE}"
    "--output=${SOURCE_FILE}"
    ${_HEADERS}
    COMMAND "${GLIB_MKENUMS_BIN}"
    ARGS
    "--template=${_HEADER_TEMPLATE}"
    "--output=${HEADER_FILE}"
    ${_HEADERS}
    VERBATIM
    COMMENT "Generating enum sources"
    DEPENDS
    ${_HEADERS}
    ${_SOURCE_TEMPLATE}
    ${_HEADER_TEMPLATE}
  )

  target_sources("${TARGET}" PRIVATE
    "${SOURCE_FILE}"
  )

  target_sources("${TARGET}" PUBLIC
    FILE_SET HEADERS
    FILES
    "${HEADER_FILE}"
  )

  target_include_directories("${TARGET}" PUBLIC
    "${CMAKE_CURRENT_BINARY_DIR}"
  )

endfunction()