extends SceneTree

## Screenshot every UI screen, so the theme can be LOOKED at rather than
## asserted about.
##
## A theme is the one kind of change no headless check can validate: every
## contrast mistake, every panel that turns out to be invisible against the
## thing behind it, and every button whose label sits outside its own chip
## compiles perfectly. So this drives the real screens with rendering on and
## writes a PNG of each.
##
##   godot --path . -s res://debug/ui_capture.gd -- <output_dir>
##
## Writes shot_menu.png, shot_pause.png, shot_character.png and
## shot_settings.png.

var _frames := 0
var _out_dir := "."


func _initialize() -> void:
	var args := OS.get_cmdline_user_args()
	if args.size() > 0:
		_out_dir = args[0]
	change_scene_to_file("res://ui/main_menu/main_menu.tscn")


func _process(_delta: float) -> bool:
	_frames += 1
	match _frames:
		50:
			_shot("menu")
			# Into a real match. The pause menu deliberately refuses to open over
			# the main menu, and it is the in-game background — a lit 3D level
			# rather than a flat colour — that its legibility has to survive.
			var nm = root.get_node_or_null("NetworkManager")
			if nm and nm.has_method("start_singleplayer_match"):
				nm.start_singleplayer_match("Deathmatch")
			change_scene_to_file("res://scenes/maps/test_level/test_level.tscn")
		200:
			_open("_show_main_menu")
		215:
			_shot("pause")
			_open("_show_character")
		320:
			# Long enough for the model to load and the springs to settle.
			_shot("character")
			_open("_show_settings")
		340:
			_shot("settings")
			quit()
	return false


func _open(screen: String) -> void:
	var menu = root.get_node_or_null("PauseMenu")
	if menu == null:
		push_warning("ui_capture: no PauseMenu autoload")
		return
	menu.visible = true
	menu.call(screen)


func _shot(name: String) -> void:
	var img := root.get_texture().get_image()
	var path := "%s/shot_%s.png" % [_out_dir, name]
	img.save_png(path)
	print("wrote %s" % path)