macro(add_to_alloptions _NEWNAME)
  list(APPEND ALLOPTIONS ${_NEWNAME})
endmacro()

macro(set_option _NAME _DESC)
  add_to_alloptions(${_NAME})
  if(${ARGC} EQUAL 3)
    set(_DEFLT ${ARGV2})
  else()
    set(_DEFLT OFF)
  endif()
  option(${_NAME} ${_DESC} ${_DEFLT})
endmacro()

macro(dep_option _NAME _DESC _DEFLT _DEPTEST _FAILDFLT)
  add_to_alloptions("${_NAME}")
  cmake_dependent_option("${_NAME}" "${_DESC}" "${_DEFLT}" "${_DEPTEST}" "${_FAILDFLT}")
endmacro()

macro(option_string _NAME _DESC _VALUE)
  add_to_alloptions(${_NAME})
  set(${_NAME} ${_VALUE} CACHE STRING "${_DESC}")
  set(HAVE_${_NAME} ${_VALUE})
endmacro()

macro(message_bool_option _NAME _VALUE)
  set(_PAD "\t")
  if(${ARGC} EQUAL 3)
    set(_PAD ${ARGV2})
  endif()
  if(${_VALUE})
    message(STATUS "  ${_NAME}:${_PAD}ON")
  else()
    message(STATUS "  ${_NAME}:${_PAD}OFF")
  endif()
endmacro()

macro(message_tested_option _NAME)
  set(_REQVALUE ${${_NAME}})
  set(_PAD " ")
  if(${ARGC} EQUAL 2)
    set(_PAD ${ARGV1})
  endif()
  string(SUBSTRING "${_NAME}" 0 4 _NAMESTART)
  if(_NAMESTART STREQUAL "SDL_")
    string(SUBSTRING "${_NAME}" 4 -1 _STRIPPEDNAME)
  else()
    set(_STRIPPEDNAME "${_NAME}")
  endif()
  if(NOT HAVE_${_STRIPPEDNAME})
    set(HAVE_${_STRIPPEDNAME} OFF)
  elseif("${HAVE_${_STRIPPEDNAME}}" MATCHES "1|TRUE|YES|Y")
    set(HAVE_${_STRIPPEDNAME} ON)
  endif()
  message(STATUS "  ${_NAME}${_PAD}(Wanted: ${_REQVALUE}): ${HAVE_${_STRIPPEDNAME}}")
endmacro()

function(find_stringlength_longest_item inList outLength)
  set(maxLength 0)
  foreach(item IN LISTS ${inList})
    string(LENGTH "${item}" slen)
    if(slen GREATER maxLength)
      set(maxLength ${slen})
    endif()
  endforeach()
  set("${outLength}" ${maxLength} PARENT_SCOPE)
endfunction()

function(message_dictlist inList)
  find_stringlength_longest_item(${inList} maxLength)
  foreach(name IN LISTS ${inList})
    # Get the padding
    string(LENGTH ${name} nameLength)
    math(EXPR padLength "(${maxLength} + 1) - ${nameLength}")
    string(RANDOM LENGTH ${padLength} ALPHABET " " padding)
    message_tested_option(${name} ${padding})
  endforeach()
endfunction()

if(APPLE)
  include(CheckOBJCSourceCompiles)
  enable_language(OBJC)
endif()

function(SDL_detect_linker)
  if(CMAKE_VERSION VERSION_LESS 3.29)
    if(NOT DEFINED SDL_CMAKE_C_COMPILER_LINKER_ID)
      execute_process(COMMAND ${CMAKE_LINKER} -v OUTPUT_VARIABLE LINKER_OUTPUT ERROR_VARIABLE LINKER_OUTPUT)
      string(REGEX REPLACE "[\r\n]" " " LINKER_OUTPUT "${LINKER_OUTPUT}")
      if(LINKER_OUTPUT MATCHES ".*Microsoft.*")
        set(linker MSVC)
      else()
        set(linker GNUlike)
      endif()
      message(STATUS "Linker identification: ${linker}")
      set(SDL_CMAKE_C_COMPILER_LINKER_ID "${linker}" CACHE STRING "Linker identification")
      mark_as_advanced(SDL_CMAKE_C_COMPILER_LINKER_ID)
    endif()
    set(CMAKE_C_COMPILER_LINKER_ID "${SDL_CMAKE_C_COMPILER_LINKER_ID}" PARENT_SCOPE)
  endif()
endfunction()

function(read_absolute_symlink DEST PATH)
  file(READ_SYMLINK "${PATH}" p)
  if(NOT IS_ABSOLUTE "${p}")
    get_filename_component(pdir "${PATH}" DIRECTORY)
    set(p "${pdir}/${p}")
  endif()
  get_filename_component(p "${p}" ABSOLUTE)
  set("${DEST}" "${p}" PARENT_SCOPE)
endfunction()

function(win32_implib_identify_dll DEST IMPLIB)
  cmake_parse_arguments(ARGS "NOTFATAL" "" "" ${ARGN})
  if(CMAKE_DLLTOOL)
    execute_process(
            COMMAND "${CMAKE_DLLTOOL}" --identify "${IMPLIB}"
            RESULT_VARIABLE retcode
            OUTPUT_VARIABLE stdout
            ERROR_VARIABLE stderr)
    if(NOT retcode EQUAL 0)
      if(NOT ARGS_NOTFATAL)
        message(FATAL_ERROR "${CMAKE_DLLTOOL} failed.")
      else()
        set("${DEST}" "${DEST}-NOTFOUND" PARENT_SCOPE)
        return()
      endif()
    endif()
    string(STRIP "${stdout}" result)
    set(${DEST} "${result}" PARENT_SCOPE)
  elseif(MSVC)
    get_filename_component(CMAKE_C_COMPILER_DIRECTORY "${CMAKE_C_COMPILER}" DIRECTORY CACHE)
    find_program(CMAKE_DUMPBIN NAMES dumpbin PATHS "${CMAKE_C_COMPILER_DIRECTORY}")
    if(CMAKE_DUMPBIN)
      execute_process(
              COMMAND "${CMAKE_DUMPBIN}" "-headers" "${IMPLIB}"
              RESULT_VARIABLE retcode
              OUTPUT_VARIABLE stdout
              ERROR_VARIABLE stderr)
      if(NOT retcode EQUAL 0)
        if(NOT ARGS_NOTFATAL)
          message(FATAL_ERROR "dumpbin failed.")
        else()
          set(${DEST} "${DEST}-NOTFOUND" PARENT_SCOPE)
          return()
        endif()
      endif()
      string(REGEX MATCH "DLL name[ ]+:[ ]+([^\n]+)\n" match "${stdout}")
      if(NOT match)
        if(NOT ARGS_NOTFATAL)
          message(FATAL_ERROR "dumpbin did not find any associated dll for ${IMPLIB}.")
        else()
          set(${DEST} "${DEST}-NOTFOUND" PARENT_SCOPE)
          return()
        endif()
      endif()
      set(result "${CMAKE_MATCH_1}")
      set(${DEST} "${result}" PARENT_SCOPE)
    else()
      message(FATAL_ERROR "Cannot find dumpbin, please set CMAKE_DUMPBIN cmake variable")
    endif()
  else()
    if(NOT ARGS_NOTFATAL)
      message(FATAL_ERROR "Don't know how to identify dll from import library. Set CMAKE_DLLTOOL (for mingw) or CMAKE_DUMPBIN (for MSVC)")
    else()
      set(${DEST} "${DEST}-NOTFOUND")
    endif()
  endif()
endfunction()

function(get_actual_target)
  set(dst "${ARGV0}")
  set(target "${${dst}}")
  set(input "${target}")
  get_target_property(alias "${target}" ALIASED_TARGET)
  while(alias)
    set(target "${alias}")
    get_target_property(alias "${target}" ALIASED_TARGET)
  endwhile()
  message(DEBUG "get_actual_target(\"${input}\") -> \"${target}\"")
  set("${dst}" "${target}" PARENT_SCOPE)
endfunction()

function(target_get_dynamic_library DEST TARGET)
  set(result)
  get_actual_target(TARGET)
  if(WIN32)
    # Use the target dll of the import library
    set(props_to_check IMPORTED_IMPLIB)
    if(CMAKE_BUILD_TYPE)
      list(APPEND props_to_check IMPORTED_IMPLIB_${CMAKE_BUILD_TYPE})
    endif()
    list(APPEND props_to_check IMPORTED_LOCATION)
    if(CMAKE_BUILD_TYPE)
      list(APPEND props_to_check IMPORTED_LOCATION_${CMAKE_BUILD_TYPE})
    endif()
    foreach (config_type ${CMAKE_CONFIGURATION_TYPES} RELEASE DEBUG RELWITHDEBINFO MINSIZEREL)
      list(APPEND props_to_check IMPORTED_IMPLIB_${config_type})
      list(APPEND props_to_check IMPORTED_LOCATION_${config_type})
    endforeach()

    foreach(prop_to_check ${props_to_check})
      if(NOT result)
        get_target_property(propvalue "${TARGET}" ${prop_to_check})
        if(propvalue AND EXISTS "${propvalue}")
          win32_implib_identify_dll(result "${propvalue}" NOTFATAL)
        endif()
      endif()
    endforeach()
  else()
    # 1. find the target library a file might be symbolic linking to
    # 2. find all other files in the same folder that symbolic link to it
    # 3. sort all these files, and select the 1st item on Linux, and last on macOS
    set(location_properties IMPORTED_LOCATION)
    if(CMAKE_BUILD_TYPE)
      list(APPEND location_properties IMPORTED_LOCATION_${CMAKE_BUILD_TYPE})
    endif()
    foreach (config_type ${CMAKE_CONFIGURATION_TYPES} RELEASE DEBUG RELWITHDEBINFO MINSIZEREL)
      list(APPEND location_properties IMPORTED_LOCATION_${config_type})
    endforeach()
    if(APPLE)
      set(valid_shared_library_regex "\\.[0-9]+\\.dylib$")
    else()
      set(valid_shared_library_regex "\\.so\\.([0-9.]+)?[0-9]")
    endif()
    foreach(location_property ${location_properties})
      if(NOT result)
        get_target_property(library_path "${TARGET}" ${location_property})
        message(DEBUG "get_target_property(${TARGET} ${location_property}) -> ${library_path}")
        if(EXISTS "${library_path}")
          get_filename_component(library_path "${library_path}" ABSOLUTE)
          while (IS_SYMLINK "${library_path}")
            read_absolute_symlink(library_path "${library_path}")
          endwhile()
          message(DEBUG "${TARGET} -> ${library_path}")
          get_filename_component(libdir "${library_path}" DIRECTORY)
          file(GLOB subfiles "${libdir}/*")
          set(similar_files "${library_path}")
          foreach(subfile ${subfiles})
            if(IS_SYMLINK "${subfile}")
              read_absolute_symlink(subfile_target "${subfile}")
              while(IS_SYMLINK "${subfile_target}")
                read_absolute_symlink(subfile_target "${subfile_target}")
              endwhile()
              get_filename_component(subfile_target "${subfile_target}" ABSOLUTE)
              if(subfile_target STREQUAL library_path AND subfile MATCHES "${valid_shared_library_regex}")
                list(APPEND similar_files "${subfile}")
              endif()
            endif()
          endforeach()
          list(SORT similar_files)
          message(DEBUG "files that are similar to \"${library_path}\"=${similar_files}")
          if(APPLE)
            list(REVERSE similar_files)
          endif()
          list(GET similar_files 0 item)
          get_filename_component(result "${item}" NAME)
        endif()
      endif()
    endforeach()
  endif()
  if(result)
    string(TOLOWER "${result}" result_lower)
    if(WIN32 OR OS2)
      if(NOT result_lower MATCHES ".*dll")
        message(FATAL_ERROR "\"${result}\" is not a .dll library")
      endif()
    elseif(APPLE)
      if(NOT result_lower MATCHES ".*dylib.*")
        message(FATAL_ERROR "\"${result}\" is not a .dylib shared library")
      endif()
    else()
      if(NOT result_lower MATCHES ".*so.*")
        message(FATAL_ERROR "\"${result}\" is not a .so shared library")
      endif()
    endif()
  else()
    get_target_property(target_type ${TARGET} TYPE)
    if(target_type MATCHES "SHARED_LIBRARY|MODULE_LIBRARY")
      # OK
    elseif(target_type MATCHES "STATIC_LIBRARY|OBJECT_LIBRARY|INTERFACE_LIBRARY|EXECUTABLE")
      message(SEND_ERROR "${TARGET} is not a shared library, but has type=${target_type}")
    else()
      message(WARNING "Unable to extract dynamic library from target=${TARGET}, type=${target_type}.")
    endif()
    # TARGET_SONAME_FILE is not allowed for DLL target platforms.
    if(WIN32)
      set(result "$<TARGET_FILE_NAME:${TARGET}>")
    else()
      set(result "$<TARGET_SONAME_FILE_NAME:${TARGET}>")
    endif()
  endif()
  set(${DEST} ${result} PARENT_SCOPE)
endfunction()

function(check_linker_supports_version_file VAR)
  SDL_detect_linker()
  if(CMAKE_C_COMPILER_LINKER_ID MATCHES "^(MSVC)$")
    set(${VAR} FALSE)
  else()
    cmake_push_check_state(RESET)
    file(WRITE "${CMAKE_CURRENT_BINARY_DIR}/CMakeFiles/dummy.sym" "n_0 {\n global:\n  func;\n local: *;\n};\n")
    list(APPEND CMAKE_REQUIRED_LINK_OPTIONS "-Wl,--version-script=${CMAKE_CURRENT_BINARY_DIR}/CMakeFiles/dummy.sym")
    check_c_source_compiles("int func(void) {return 0;} int main(int argc,char*argv[]){(void)argc;(void)argv;return func();}" ${VAR} FAIL_REGEX "(unsupported|syntax error|unrecognized option)")
    cmake_pop_check_state()
  endif()
  set(${VAR} "${${VAR}}" PARENT_SCOPE)
endfunction()

if(CMAKE_VERSION VERSION_LESS 3.18)
  function(check_linker_flag LANG FLAG VAR)
    cmake_push_check_state(RESET)
    list(APPEND CMAKE_REQUIRED_LINK_OPTIONS ${FLAG})
    if(LANG STREQUAL "C")
      include(CheckCSourceCompiles)
      check_c_source_compiles("int main(int argc,char*argv[]){(void)argc;(void)argv;return 0;}" ${VAR} FAIL_REGEX "(unsupported|syntax error)")
    elseif(LANG STREQUAL "CXX")
      include(CheckCXXSourceCompiles)
      check_cxx_source_compiles("int main(int argc,char*argv[]){(void)argc;(void)argv;return 0;}" ${VAR} FAIL_REGEX "(unsupported|syntax error)")
    else()
      message(FATAL_ERROR "Unsupported language: ${LANG}")
    endif()
    cmake_pop_check_state()
  endfunction()
else()
  cmake_policy(SET CMP0057 NEW)  # Support new if() IN_LIST operator. (used inside check_linker_flag, used in CMake 3.18)
  include(CheckLinkerFlag)
endif()

if(APPLE)
  check_language(OBJC)
  if(NOT CMAKE_OBJC_COMPILER)
    message(WARNING "Cannot find working OBJC compiler.")
  endif()
endif()

function(PrintEnabledBackends _SUBSYS _REGEXP)
  get_cmake_property(_ALLVARS VARIABLES)
  foreach(_VAR IN LISTS _ALLVARS)
    if(_VAR AND _VAR MATCHES "${_REGEXP}")
      string(TOLOWER "${CMAKE_MATCH_1}" _LOWERED)
      if(NOT _LOWERED MATCHES "available|default|dynamic")  # a little hack
        if(${_VAR}_DYNAMIC)
          list(APPEND _ENABLED_BACKENDS "${_LOWERED}(dynamic)")
        else()
          list(APPEND _ENABLED_BACKENDS "${_LOWERED}")
        endif()
      endif()
    endif()
  endforeach()

  if(_ENABLED_BACKENDS STREQUAL "")
    set(_SPACEDOUT "(none)")
  else()
    string(REPLACE ";" " " _SPACEDOUT "${_ENABLED_BACKENDS}")
  endif()
  message(STATUS "  ${_SUBSYS}: ${_SPACEDOUT}")
endfunction()

function(SDL_PrintSummary)
  ##### Info output #####
  message(STATUS "")
  message(STATUS "SDL3 was configured with the following options:")
  message(STATUS "")
  message(STATUS "Platform: ${CMAKE_SYSTEM}")
  message(STATUS "64-bit:   ${ARCH_64}")
  message(STATUS "Compiler: ${CMAKE_C_COMPILER}")
  message(STATUS "Revision: ${SDL_REVISION}")
  message(STATUS "Vendor:   ${SDL_VENDOR_INFO}")
  message(STATUS "")
  message(STATUS "Subsystems:")

  find_stringlength_longest_item(SDL_SUBSYSTEMS maxLength)
  foreach(_SUB IN LISTS SDL_SUBSYSTEMS)
    string(LENGTH ${_SUB} _SUBLEN)
    math(EXPR _PADLEN "(${maxLength} + 1) - ${_SUBLEN}")
    string(RANDOM LENGTH ${_PADLEN} ALPHABET " " _PADDING)
    string(TOUPPER ${_SUB} _OPT)
    message_bool_option(${_SUB} SDL_${_OPT} ${_PADDING})
  endforeach()
  message(STATUS "")
  message(STATUS "Options:")
  list(SORT ALLOPTIONS)
  message_dictlist(ALLOPTIONS)
  message(STATUS "")
  message(STATUS " Build Shared Library: ${SDL_SHARED}")
  message(STATUS " Build Static Library: ${SDL_STATIC}")
  if(APPLE)
    message(STATUS " Build libraries as Apple Framework: ${SDL_FRAMEWORK}")
  endif()
  message(STATUS "")

  message(STATUS "Enabled backends:")
  PrintEnabledBackends("Video drivers" "^SDL_VIDEO_DRIVER_([A-Z0-9]*)$")
  if(SDL_VIDEO_DRIVER_X11)
    PrintEnabledBackends("X11 libraries" "^SDL_VIDEO_DRIVER_X11_([A-Z0-9]*)$")
  endif()
  PrintEnabledBackends("Render drivers" "^SDL_VIDEO_RENDER_([A-Z0-9_]*)$")
  PrintEnabledBackends("GPU drivers" "^SDL_GPU_([A-Z0-9]*)$")
  PrintEnabledBackends("Audio drivers" "^SDL_AUDIO_DRIVER_([A-Z0-9]*)$")
  PrintEnabledBackends("Joystick drivers" "^SDL_JOYSTICK_([A-Z0-9]*)$")
  PrintEnabledBackends("Camera drivers" "^SDL_CAMERA_DRIVER_([A-Z0-9]*)$")
  message(STATUS "")

  if(UNIX)
    message(STATUS "If something was not detected, although the libraries")
    message(STATUS "were installed, then make sure you have set the")
    message(STATUS "CMAKE_C_FLAGS and CMAKE_PREFIX_PATH CMake variables correctly.")
    message(STATUS "")
  endif()

  if(UNIX AND NOT (ANDROID OR APPLE OR EMSCRIPTEN OR HAIKU OR RISCOS))
    if(NOT (HAVE_X11 OR HAVE_WAYLAND))
      if(NOT SDL_UNIX_CONSOLE_BUILD)
        message(FATAL_ERROR
          "SDL could not find X11 or Wayland development libraries on your system. "
          "This means SDL will not be able to create windows on a typical unix operating system. "
          "Most likely, this is not wanted."
          "\n"
          "On Linux, install the packages listed at "
          "https://wiki.libsdl.org/SDL3/README-linux#build-dependencies "
          "\n"
          "If you really don't need desktop windows, the documentation tells you how to skip this check. "
          "https://github.com/libsdl-org/SDL/blob/main/docs/README-cmake.md#cmake-fails-to-build-without-x11-or-wayland-support\n"
        )
      endif()
    endif()
  endif()
endfunction()

function(SDL_missing_dependency NAME OPTION)
  if(LINUX)
    message( FATAL_ERROR
      "Couldn't find dependency package for ${NAME}. Please install the needed packages or configure with -D${OPTION}=OFF"
      "\n"
      "The full set of dependencies is available at "
      "https://wiki.libsdl.org/SDL3/README-linux#build-dependencies "
      "\n"
    )
  else()
    message( FATAL_ERROR
      "Couldn't find dependency package for ${NAME}. Please install the needed packages or configure with -D${OPTION}=OFF"
    )
  endif()
endfunction()

function(SDL_install_pdb TARGET DIRECTORY)
  get_property(type TARGET ${TARGET} PROPERTY TYPE)
  if(type MATCHES "^(SHARED_LIBRARY|EXECUTABLE)$")
    install(FILES $<TARGET_PDB_FILE:${TARGET}> DESTINATION "${DIRECTORY}" OPTIONAL)
  elseif(type STREQUAL "STATIC_LIBRARY")
    # FIXME: Use $<TARGET_COMPILE_PDB_FILE:${TARGET} once it becomes available (https://gitlab.kitware.com/cmake/cmake/-/issues/25244)
    if(CMAKE_GENERATOR MATCHES "^Visual Studio.*")
      install(CODE "file(INSTALL DESTINATION \"\${CMAKE_INSTALL_PREFIX}/${DIRECTORY}\" TYPE FILE OPTIONAL FILES \"${CMAKE_CURRENT_BINARY_DIR}/\${CMAKE_INSTALL_CONFIG_NAME}/${TARGET}.pdb\")")
    else()
      install(CODE "file(INSTALL DESTINATION \"\${CMAKE_INSTALL_PREFIX}/${DIRECTORY}\" TYPE FILE OPTIONAL FILES \"${CMAKE_CURRENT_BINARY_DIR}/CMakeFiles/${TARGET}.dir/${TARGET}.pdb\")")
    endif()
  endif()
endfunction()
