extends SceneTree

## Regression capture for directional cloud lighting.
##
## Runs the same Akiba street camera twice with the sun rotated 180 degrees.
## The bright cloud rim and colored lee-side band should visibly swap sides.
##
##   godot --path . -s res://debug/cloud_sun_response_capture.gd -- <out_dir>

var _frame := 0
var _out_dir := "."
var _sun: DirectionalLight3D


func _initialize() -> void:
	var args := OS.get_cmdline_user_args()
	if not args.is_empty():
		_out_dir = args[0]
	if not _out_dir.is_absolute_path():
		_out_dir = ProjectSettings.globalize_path(_out_dir)
	var mkdir_error := DirAccess.make_dir_recursive_absolute(_out_dir)
	if mkdir_error != OK:
		printerr("cloud_sun_capture: could not create output directory")
		quit(mkdir_error)
		return
	change_scene_to_file("res://ui/main_menu/main_menu.tscn")


func _process(_delta: float) -> bool:
	_frame += 1
	if _frame == 60:
		var network = root.get_node_or_null("NetworkManager")
		if network and network.has_method("start_singleplayer_match"):
			network.start_singleplayer_match(GameMode.DEATHMATCH)
		change_scene_to_file("res://scenes/maps/neon_alley/neon_alley.tscn")
	elif _frame == 240:
		_sun = current_scene.get_node_or_null("Sun") as DirectionalLight3D
		var camera := root.get_camera_3d()
		if _sun == null or camera == null:
			printerr("cloud_sun_capture: missing sun or camera")
			return true
		camera.global_position = Vector3(3, 2.2, 20)
		camera.look_at(Vector3(-8, 4, -18), Vector3.UP)
		_sun.rotation_degrees = Vector3(-28, -65, 0)
	elif _frame == 280:
		_shot("sun_west")
		_sun.rotation_degrees = Vector3(-28, 115, 0)
	elif _frame == 320:
		_shot("sun_east")
		unload_current_scene()
	elif _frame == 440:
		return true
	return false


func _shot(tag: String) -> void:
	var image := root.get_viewport().get_texture().get_image()
	var path := _out_dir.path_join(tag + ".png")
	var error := image.save_png(path)
	if error == OK:
		print("cloud_sun_capture: saved ", path)
	else:
		printerr("cloud_sun_capture: save failed with error ", error)