extends Node
## Menu load time and frame cost on the current machine (no general performance claim).
## Run: godot --path . --resolution 1920x1080 res://tools/menu_benchmark.tscn -- --label=after
var main: Node3D
func _ready() -> void:
	call_deferred("run")
func viewports() -> Array[RID]:
	var list: Array[RID] = [get_viewport().get_viewport_rid()]
	for node: Node in get_tree().root.find_children("*", "SubViewport", true, false):
		if (node as SubViewport).render_target_update_mode != SubViewport.UPDATE_DISABLED:
			list.append((node as SubViewport).get_viewport_rid())
	return list
func run() -> void:
	var label := "run"
	for arg: String in OS.get_cmdline_user_args():
		if arg.begins_with("--label="):
			label = arg.substr(8)
	Soundscape.enabled = false
	WaveManager.set_physics_process(false)
	DisplayServer.window_set_vsync_mode(DisplayServer.VSYNC_DISABLED)
	var started: int = Time.get_ticks_usec()
	main = load("res://scenes/main.tscn").instantiate()
	add_child(main)
	var instanced: int = Time.get_ticks_usec()
	await RenderingServer.frame_post_draw
	var first_frame: int = Time.get_ticks_usec()
	var in_game: bool = "--in-game" in OS.get_cmdline_user_args()
	var stage_ready_ms: float = -1.0
	var menu: Node = main.hud.get("main_menu")
	if menu != null:
		while not (menu.stage.is_ready("glutpakt") and menu.stage.is_ready("wurzelbund")):
			await get_tree().process_frame
		stage_ready_ms = (Time.get_ticks_usec() - started) / 1000.0
	if in_game:
		main.hud._overlay_action.pressed.emit()
		label += "-build"
		await get_tree().create_timer(1.0).timeout
	for rid: RID in viewports():
		RenderingServer.viewport_set_measure_render_time(rid, true)
	var warm_until: int = Time.get_ticks_msec() + 2500
	while Time.get_ticks_msec() < warm_until:
		await get_tree().process_frame
	var frames: Array[float] = []
	var gpu: Array[float] = []
	var cpu_render: Array[float] = []
	var draw_calls: Array[float] = []
	var last: int = Time.get_ticks_usec()
	var end: int = Time.get_ticks_msec() + 6000
	while Time.get_ticks_msec() < end:
		await RenderingServer.frame_post_draw
		var now: int = Time.get_ticks_usec()
		frames.append((now - last) / 1000.0)
		last = now
		var g: float = 0.0
		var c: float = 0.0
		for rid: RID in viewports():
			g += RenderingServer.viewport_get_measured_render_time_gpu(rid)
			c += RenderingServer.viewport_get_measured_render_time_cpu(rid)
		gpu.append(g)
		cpu_render.append(c)
		draw_calls.append(Performance.get_monitor(Performance.RENDER_TOTAL_DRAW_CALLS_IN_FRAME))
	frames.sort()
	var mean := func(values: Array[float]) -> float:
		var total: float = 0.0
		for v: float in values: total += v
		return total / maxf(1, values.size())
	var report := {
		"label": label, "window": get_window().size, "canvas": get_viewport().get_visible_rect().size,
		"renderer": RenderingServer.get_current_rendering_method(), "gpu": RenderingServer.get_video_adapter_name(),
		"driver": RenderingServer.get_video_adapter_api_version(), "engine": Engine.get_version_info().string,
		"os": OS.get_name() + " " + OS.get_version(), "cpu": OS.get_processor_name(),
		"instantiate_ms": (instanced - started) / 1000.0, "first_frame_ms": (first_frame - started) / 1000.0, "stage_ready_ms": stage_ready_ms,
		"frames": frames.size(), "frame_ms_mean": mean.call(frames), "frame_ms_p95": frames[int(frames.size() * .95)],
		"gpu_ms_mean": mean.call(gpu), "render_cpu_ms_mean": mean.call(cpu_render),
		"draw_calls_mean": mean.call(draw_calls), "video_mem_mb": Performance.get_monitor(Performance.RENDER_VIDEO_MEM_USED) / 1048576.0,
		"static_mem_mb": Performance.get_monitor(Performance.MEMORY_STATIC) / 1048576.0,
		"vsync": "disabled", "phase": GameState.phase_name(), "viewports_measured": viewports().size()}
	var path := "res://docs/phase20-logs/perf-%s-%dx%d.json" % [label, get_window().size.x, get_window().size.y]
	var file := FileAccess.open(path, FileAccess.WRITE)
	file.store_string(JSON.stringify(report, "\t"))
	file.close()
	print("MENU_BENCHMARK: ", JSON.stringify(report))
	await Soundscape.quit_game()