/*

Usage:
Override /Run() to run your test code

Call TEST_FAIL() to fail the test (You should specify a reason)

You may use /New() and /Destroy() for setup/teardown respectively

You can use the run_loc_floor_bottom_left and run_loc_floor_top_right to get turfs for testing

*/

GLOBAL_DATUM(current_test, /datum/unit_test)
GLOBAL_VAR_INIT(failed_any_test, FALSE)
/// When unit testing, all logs sent to log_mapping are stored here and retrieved in log_mapping unit test.
GLOBAL_LIST_EMPTY(unit_test_mapping_logs)
/// Global assoc list of required mapping items, [item typepath] to [required item datum].
GLOBAL_LIST_EMPTY(required_map_items)

/// A list of every test that is currently focused.
/// Use the PERFORM_ALL_TESTS macro instead.
GLOBAL_VAR_INIT(focused_tests, focused_tests())

/proc/focused_tests()
	var/list/focused_tests = list()
	for (var/datum/unit_test/unit_test as anything in subtypesof(/datum/unit_test))
		if (initial(unit_test.focus))
			focused_tests += unit_test

	return focused_tests.len > 0 ? focused_tests : null

/datum/unit_test
	//Bit of metadata for the future maybe
	var/list/procs_tested

	/// The bottom left floor turf of the testing zone
	var/turf/run_loc_floor_bottom_left

	/// The top right floor turf of the testing zone
	var/turf/run_loc_floor_top_right
	///The priority of the test, the larger it is the later it fires
	var/priority = TEST_DEFAULT
	//internal shit
	var/focus = FALSE
	var/succeeded = TRUE
	var/list/allocated
	var/list/fail_reasons

	/// Do not instantiate if type matches this
	var/abstract_type = /datum/unit_test

	var/static/datum/space_level/reservation

/proc/cmp_unit_test_priority(datum/unit_test/a, datum/unit_test/b)
	return initial(a.priority) - initial(b.priority)

/datum/unit_test/New()
	if (isnull(reservation))
		var/datum/map_template/unit_tests/template = new
		reservation = template.load_new_z()

	allocated = new
	run_loc_floor_bottom_left = get_turf(locate(/obj/effect/landmark/unit_test_bottom_left) in GLOB.landmarks_list)
	run_loc_floor_top_right = get_turf(locate(/obj/effect/landmark/unit_test_top_right) in GLOB.landmarks_list)

	TEST_ASSERT(isfloorturf(run_loc_floor_bottom_left), "run_loc_floor_bottom_left was not a floor ([run_loc_floor_bottom_left])")
	TEST_ASSERT(isfloorturf(run_loc_floor_top_right), "run_loc_floor_top_right was not a floor ([run_loc_floor_top_right])")

/datum/unit_test/Destroy()
	QDEL_LIST(allocated)
	// clear the test area
	for (var/turf/turf in Z_TURFS(run_loc_floor_bottom_left.z))
		for (var/content in turf.contents)
			if (istype(content, /obj/effect/landmark))
				continue
			qdel(content)
	return ..()

/datum/unit_test/proc/Run()
	TEST_FAIL("[type]/Run() called parent or not implemented")

/datum/unit_test/proc/Fail(reason = "No reason", file = "OUTDATED_TEST", line = 1)
	succeeded = FALSE

	if(!istext(reason))
		reason = "FORMATTED: [reason != null ? reason : "NULL"]"

	LAZYADD(fail_reasons, list(list(reason, file, line)))

/// Allocates an instance of the provided type, and places it somewhere in an available loc
/// Instances allocated through this proc will be destroyed when the test is over
/datum/unit_test/proc/allocate(type, ...)
	var/list/arguments = args.Copy(2)
	if(ispath(type, /atom))
		if (!arguments.len)
			arguments = list(run_loc_floor_bottom_left)
		else if (arguments[1] == null)
			arguments[1] = run_loc_floor_bottom_left
	var/instance
	// Byond will throw an index out of bounds if arguments is empty in that arglist call. Sigh
	if(length(arguments))
		instance = new type(arglist(arguments))
	else
		instance = new type()
	allocated += instance
	return instance

/datum/unit_test/proc/test_screenshot(name, icon/icon)
	if (!istype(icon))
		TEST_FAIL("[icon] is not an icon.")
		return

	var/path_prefix = replacetext(replacetext("[type]", "/datum/unit_test/", ""), "/", "_")
	name = replacetext(name, "/", "_")

	var/filename = "code/modules/unit_tests/screenshots/[path_prefix]_[name].png"

	if (fexists(filename))
		var/data_filename = "data/screenshots/[path_prefix]_[name].png"
		fcopy(icon, data_filename)
		log_test("\t[path_prefix]_[name] was found, putting in data/screenshots")
	else if (fexists("code"))
		// We are probably running in a local build
		fcopy(icon, filename)
		TEST_FAIL("Screenshot for [name] did not exist. One has been created.")
	else
		// We are probably running in real CI, so just pretend it worked and move on
		fcopy(icon, "data/screenshots_new/[path_prefix]_[name].png")

		log_test("\t[path_prefix]_[name] was put in data/screenshots_new")

/// Helper for screenshot tests to take an image of an atom from all directions and insert it into one icon
/datum/unit_test/proc/get_flat_icon_for_all_directions(atom/thing, no_anim = TRUE)
	var/icon/output = icon('icons/effects/effects.dmi', "nothing")

	for (var/direction in GLOB.cardinals)
		var/icon/partial = getFlatIcon(thing, defdir = direction, no_anim = no_anim)
		output.Insert(partial, dir = direction)

	return output

/// Logs a test message. Will use GitHub action syntax found at https://docs.github.com/en/actions/using-workflows/workflow-commands-for-github-actions
/datum/unit_test/proc/log_for_test(text, priority, file, line)
	var/map_name = SSmapping.config.map_name

	// Need to escape the text to properly support newlines.
	var/annotation_text = replacetext(text, "%", "%25")
	annotation_text = replacetext(annotation_text, "\n", "%0A")

	log_world("::[priority] file=[file],line=[line],title=[map_name]: [type]::[annotation_text]")

/proc/RunUnitTest(datum/unit_test/test_path, list/test_results)
	if(ispath(test_path, /datum/unit_test/focus_only))
		return

	if(initial(test_path.abstract_type) == test_path)
		return

	var/datum/unit_test/test = new test_path

	GLOB.current_test = test
	var/duration = REALTIMEOFDAY
	var/skip_test = (test_path in SSmapping.config.skipped_tests)
	var/test_output_desc = "[test_path]"
	var/message = ""

	log_world("::group::[test_path]")

	if(skip_test)
		log_world("[TEST_OUTPUT_YELLOW("SKIPPED")] Skipped run on map [SSmapping.config.map_name].")

	else

		test.Run()

		duration = REALTIMEOFDAY - duration
		GLOB.current_test = null
		GLOB.failed_any_test |= !test.succeeded

		var/list/log_entry = list()
		var/list/fail_reasons = test.fail_reasons

		for(var/reasonID in 1 to LAZYLEN(fail_reasons))
			var/text = fail_reasons[reasonID][1]
			var/file = fail_reasons[reasonID][2]
			var/line = fail_reasons[reasonID][3]

			test.log_for_test(text, "error", file, line)

			// Normal log message
			log_entry += "\tFAILURE #[reasonID]: [text] at [file]:[line]"

		if(length(log_entry))
			message = log_entry.Join("\n")
			log_test(message)

		test_output_desc += " [duration / 10]s"
		if (test.succeeded)
			log_world("[TEST_OUTPUT_GREEN("PASS")] [test_output_desc]")

	log_world("::endgroup::")

	if (!test.succeeded && !skip_test)
		log_world("::error::[TEST_OUTPUT_RED("FAIL")] [test_output_desc]")

	var/final_status = skip_test ? UNIT_TEST_SKIPPED : (test.succeeded ? UNIT_TEST_PASSED : UNIT_TEST_FAILED)
	test_results[test_path] = list("status" = final_status, "message" = message, "name" = test_path)

	qdel(test)

/proc/RunUnitTests()
	CHECK_TICK

	var/list/tests_to_run = subtypesof(/datum/unit_test)
	var/list/focused_tests = list()
	for (var/_test_to_run in tests_to_run)
		var/datum/unit_test/test_to_run = _test_to_run
		if (initial(test_to_run.focus))
			focused_tests += test_to_run
	if(length(focused_tests))
		tests_to_run = focused_tests

	tests_to_run = sortTim(tests_to_run, GLOBAL_PROC_REF(cmp_unit_test_priority))

	var/list/test_results = list()

	for(var/unit_path in tests_to_run)
		CHECK_TICK //We check tick first because the unit test we run last may be so expensive that checking tick will lock up this loop forever
		RunUnitTest(unit_path, test_results)

	var/file_name = "data/unit_tests.json"
	fdel(file_name)
	file(file_name) << json_encode(test_results)

	SSticker.force_ending = TRUE
	//We have to call this manually because del_text can preceed us, and SSticker doesn't fire in the post game
	SSticker.declare_completion()

/datum/map_template/unit_tests
	name = "Unit Tests Zone"
	mappath = "_maps/templates/unit_tests.dmm"