# SPDX-FileCopyrightText: 2025 Felix Morgner <felix.morgner@gmail.com>
# SPDX-License-Identifier: LGPL-2.1-only

find_program(GLIB_COMPILE_RESOURCES
  NAMES "glib-compile-resources"
  REQUIRED
)

function(target_add_glib_resources TARGET)
  set(SINGLE_VALUE_ARGS "NAME" "PREFIX" "WORKING_DIRECTORY")
  set(MULTI_VALUE_ARGS "CSS_FILES" "XML_FILES")
  cmake_parse_arguments(
    PARSE_ARGV 1
    ""
    "${OPTIONS}"
    "${SINGLE_VALUE_ARGS}"
    "${MULTI_VALUE_ARGS}"
  )

  # Sanity Checks

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

  if(NOT _NAME)
    set(_NAME "${TARGET}")
  endif()

  if(NOT _PREFIX)
    message(FATAL_ERROR "Glib resource prefix not defined")
  endif()

  if(NOT _WORKING_DIRECTORY)
    set(_WORKING_DIRECTORY "${CMAKE_CURRENT_SOURCE_DIR}")
  endif()

  # File Names

  set(GLIB_RESOURCE_C_FILE "${CMAKE_CURRENT_BINARY_DIR}/${_NAME}.gresource.c")
  set(GLIB_RESOURCE_MANIFEST "${CMAKE_CURRENT_BINARY_DIR}/${_NAME}.gresource.xml")

  # Manifest File

  foreach(XML_FILE IN LISTS _XML_FILES)
    string(APPEND GLIB_RESOURCE_FILES "    <file compressed=\"true\" preprocess=\"xml-stripblanks\">${XML_FILE}</file>\n")
  endforeach()

  foreach(CSS_FILE IN LISTS _CSS_FILES)
    string(APPEND GLIB_RESOURCE_FILES "    <file compressed=\"true\">${CSS_FILE}</file>\n")
  endforeach()

  string(STRIP "${GLIB_RESOURCE_FILES}" GLIB_RESOURCE_FILES)
  set(GLIB_RESOURCE_PREFIX "${_PREFIX}")
  configure_file("${CMAKE_CURRENT_FUNCTION_LIST_DIR}/GlibCompileResources.in"
    "${GLIB_RESOURCE_MANIFEST}"
  )

  # Source Generation

  foreach(FILE IN LISTS _CSS_FILES _XML_FILES)
    list(APPEND _DEPS "${_WORKING_DIRECTORY}/${FILE}")
  endforeach()
  

  add_custom_command(OUTPUT "${GLIB_RESOURCE_C_FILE}"
    WORKING_DIRECTORY "${_WORKING_DIRECTORY}"
    COMMAND "${GLIB_COMPILE_RESOURCES}"
    ARGS
    "--target=${GLIB_RESOURCE_C_FILE}"
    "--generate-source"
    "--internal"
    "${GLIB_RESOURCE_MANIFEST}"
    VERBATIM
    MAIN_DEPENDENCY "${GLIB_RESOURCE_MANIFEST}"
    DEPENDS
    ${_DEPS}
  )

  # Target Inclusion

  target_sources("${TARGET}" PRIVATE
    "${GLIB_RESOURCE_C_FILE}"
  )
endfunction()