extends SceneTree
## Native renderer review of a scripted walk through the actual loaded meadow.
## The capture moves presentation only and verifies the simulation checksum.

const OUTPUT := "res://docs/baselines/foliage_"


func _initialize() -> void:
	call_deferred("_run")


func _run() -> void:
	root.size = Vector2i(1600, 900)
	var main := load("res://main.tscn").instantiate() as Node3D
	main.get_node("SimulationManager").set("debug_logs", false)
	root.add_child(main)
	await process_frame
	var manager := main.get_node("SimulationManager")
	manager.set_process(false)
	var checksum: String = manager.get_state_checksum()
	var world := main.get_node("JajceWorld") as JajceWorld
	world.apply_presentation_quality(JajceWorld.PresentationQuality.HIGH)
	var controller := world.grass_controller
	controller.set_process(false)
	var cycle := world.get_node("DayNightCycle")
	cycle.set_process(false)
	cycle.call("_apply_light_rotation", 0.4)
	cycle.call("_apply_environment", 0.4)
	for layer in main.get_children():
		if layer is CanvasLayer:
			layer.hide()
	for actor in get_nodes_in_group("grass_interactors"):
		actor.set_physics_process(false)
		actor.set_process(false)
	var player := main.get_node("Player") as CharacterBody3D
	player.get_node("Visual/Sword").hide()
	main.get_node("CameraRig").set_physics_process(false)
	var camera := root.get_camera_3d()
	camera.reparent(main)
	camera.global_position = Vector3(16, 7.5, 23)
	camera.look_at(Vector3(11, 0.6, 10.5))
	camera.fov = 48
	player.position = Vector3(5, 0, 10.85)
	player.get_node("Visual").rotation.y = -PI / 2.0
	for _frame in 90:
		await process_frame
	# Freeze wind and particles so the four review frames isolate contact deformation.
	Engine.time_scale = 0.0
	var demo := main.get_node("DemoController")
	if demo.get("debug_overlay_visible"):
		demo.call("toggle_debug_overlay")
	for layer in main.get_children():
		if layer is CanvasLayer:
			layer.hide()
	controller.call("reset_interaction")
	await _save("before.png")
	var update_times: Array[float] = []
	for step in 61:
		player.position.x = 5.0 + step * 0.18
		player.position.y = world.terrain.data.get_height(player.position) + 0.02
		var start := Time.get_ticks_usec()
		controller.call("_refresh_interactors", 0.08)
		update_times.append(float(Time.get_ticks_usec() - start) / 1000.0)
		for _frame in 5:
			await process_frame
		if step == 37:
			await _save("contact.png")
	await _save("trail.png")
	var active_cells := (controller.get("_trail_map").get("_cells") as Dictionary).size()
	var draws := Performance.get_monitor(Performance.RENDER_TOTAL_DRAW_CALLS_IN_FRAME)
	for _step in 110:
		controller.call("_refresh_interactors", 0.08)
		for _frame in 5:
			await process_frame
	await _save("recovered.png")
	update_times.sort()
	var report := {
		"renderer": RenderingServer.get_current_rendering_driver_name(),
		"resolution": "1600x900",
		"profile": "High",
		"workload":
		"Actual Jajce meadow; 8 nearest actors, player presentation follows an 11 m sweep",
		"controller_update_p50_ms": update_times[30],
		"controller_update_p95_ms": update_times[57],
		"active_trail_texels": active_cells,
		"trail_texture_bytes": 128 * 128 * 16,
		"draw_calls": draws,
		"simulation_checksum_unchanged": manager.get_state_checksum() == checksum,
		"note":
		"CPU timing includes scanning, field painting and material uploads; not isolated GPU frame time."
	}
	var file := FileAccess.open(OUTPUT + "render_metrics.json", FileAccess.WRITE)
	file.store_string(JSON.stringify(report, "\t") + "\n")
	print(JSON.stringify(report))
	assert(manager.get_state_checksum() == checksum)
	main.free()
	Engine.time_scale = 1.0
	await process_frame
	quit(0)


func _save(filename: String) -> void:
	await RenderingServer.frame_post_draw
	var capture := root.get_texture().get_image()
	assert(not capture.is_empty())
	assert(capture.save_png(OUTPUT + filename) == OK)