cmake_minimum_required(VERSION 3.16)

function(load_module MODULE_NAME)
	set(keyword_optional_args UPDATE RECURSIVE)
	set(keyword_single_arg_args SOURCE DESTINATION VERSION)
	set(keyword_multi_arg_args)

	cmake_parse_arguments(LOAD_MODULE ${keyword_optional_args} ${keyword_single_arg_args} ${keyword_multi_arg_args} ${ARGN})
	
	if (NOT LOAD_MODULE_DESTINATION)
		set(LOAD_MODULE_DESTINATION "${CMAKE_CURRENT_LIST_DIR}/modules")
	endif()
	
	if (LOAD_MODULE_VERSION)
		set(MODULE_DIR_NAME "${MODULE_NAME}-${LOAD_MODULE_VERSION}")
	else()
		set(MODULE_DIR_NAME ${MODULE_NAME})
	endif()
	
	set(MODULE_PATH "${LOAD_MODULE_DESTINATION}/${MODULE_DIR_NAME}")
	
	message(CHECK_START "Loading module ${MODULE_NAME}")

	if (EXISTS ${MODULE_PATH})
		message(CHECK_PASS "Module already installed")

		if (LOAD_MODULE_UPDATE)
			message(CHECK_START "Updating Module ${MODULE_NAME}")
			execute_process(
				COMMAND git pull 
				WORKING_DIRECTORY ${MODULE_PATH}
				RESULT_VARIABLE GIT_PULL_RESULT)

			if (GIT_PULL_RESULT EQUAL 0)
				message(CHECK_PASS "successful")
			else()
				message(CHECK_FAIL "failed")
			endif()
		endif()
	else()
	
		message(CHECK_FAIL "Module not installed")
		message(CHECK_START "Downloading module ${MODULE_NAME}")
		
		# Create module destination directory
		file(MAKE_DIRECTORY ${LOAD_MODULE_DESTINATION})
		execute_process(
			COMMAND git clone ${LOAD_MODULE_SOURCE} ${MODULE_NAME} 
			WORKING_DIRECTORY ${LOAD_MODULE_DESTINATION}
			RESULT_VARIABLE GIT_CLONE_RESULT)

		if (GIT_CLONE_RESULT EQUAL 0)
			message(CHECK_PASS "successful")
		else()
			message(CHECK_FAIL "failed")
			message(SEND_ERROR "Failed to load module ${MODULE_NAME}")

			return()
		endif()

	endif()
	
	add_subdirectory(${MODULE_PATH})

endfunction()