set(SRCS
	lapi.c
	lauxlib.c
	lbaselib.c
	lcode.c
	lcorolib.c
	lctype.c
	ldblib.c
	ldebug.c
	ldo.c
	ldump.c
	lfunc.c
	lgc.c
	linit.c
	liolib.c
	llex.c
	lmathlib.c
	lmem.c
	loadlib.c
	lobject.c
	lopcodes.c
	loslib.c
	lparser.c
	lstate.c
	lstring.c
	lstrlib.c
	ltable.c
	ltablib.c
	ltm.c
	lundump.c
	lutf8lib.c
	lvm.c
	lzio.c
	)

set(LIB lua54)
engine_add_library(
	LIB ${LIB}
	SRCS ${SRCS}
)

function(configure_lua TARGET)
	target_link_libraries(${TARGET} ${CMAKE_DL_LIBS})
	target_compile_definitions(${TARGET} PUBLIC LUA_USE_LONGJMP LUA_COMPAT_MODULE)
	if (ANDROID OR EMSCRIPTEN)
		target_compile_definitions(${TARGET} PUBLIC -DLUA_ANSI -DLUA_USE_C89)
	elseif (LINUX)
		target_compile_definitions(${TARGET} PUBLIC -DLUA_USE_LINUX)
	elseif(APPLE)
		target_compile_definitions(${TARGET} PUBLIC -DLUA_USE_MACOSX)
	endif()
	target_compile_definitions(${TARGET} PRIVATE "-DLUA_USE_APICHECK")
endfunction()

if (NOT LUA54_FOUND)
	configure_lua(${LIB})
endif()

if (NOT CMAKE_CROSSCOMPILING)
find_program(LUAC_EXECUTABLE NAMES luac5.4 luac)
if (LUAC_EXECUTABLE)
	execute_process(
		COMMAND "${LUAC_EXECUTABLE}" -v
		OUTPUT_VARIABLE LUAC_VERSION_OUTPUT
		ERROR_VARIABLE LUAC_VERSION_OUTPUT
		OUTPUT_STRIP_TRAILING_WHITESPACE
		ERROR_STRIP_TRAILING_WHITESPACE
	)
	# Parse the version number from the output
	string(REGEX MATCH "5\\.[0-9]+" LUAC_VERSION ${LUAC_VERSION_OUTPUT})
	if (LUAC_VERSION VERSION_LESS "5.4")
		unset(LUAC_EXECUTABLE CACHE)
		message(STATUS "luac version ${LUAC_VERSION} found - ignore this one")
	else()
		message(STATUS "luac version ${LUAC_VERSION} found")
	endif()
endif()

if (NOT LUAC_EXECUTABLE)
	message(STATUS "luac not found - use bundled version")
	add_executable(luac luac.c ${SRCS})
	configure_lua(luac)
else()
	message(STATUS "${LUAC_EXECUTABLE} found")
	add_executable(luac IMPORTED GLOBAL)
	set_property(TARGET luac PROPERTY IMPORTED_LOCATION ${LUAC_EXECUTABLE})
endif()
endif(NOT CMAKE_CROSSCOMPILING)