extends SceneTree
## Starts the game in a temporary storage folder, walks the figure toward the
## rock beside the clearing, hits it once and saves a screenshot. Lets a
## change to the look be checked without playing by hand. The player's real
## key and save stay untouched.
##
## From the repository root (opens a window for a moment):
##   godot --path game -s res://tools/screenshot.gd -- <path of the PNG>

const STORAGE := "user://screenshot-run"
const FRAMES_AFTER_HIT := 30


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


func _run() -> void:
	var arguments := OS.get_cmdline_user_args()
	var output := arguments[0] if arguments.size() > 0 else "user://screenshot.png"
	DirAccess.make_dir_recursive_absolute(STORAGE)
	var main: Node = load("res://main.tscn").instantiate()
	main.storage_dir = STORAGE
	main.command_line = PackedStringArray()
	root.add_child(main)
	main.play(false)
	await process_frame

	# Four tiles to the right, toward the rock outcrop beside the clearing.
	for frame in 48:
		main.avatar.walk(Vector2.RIGHT, 1.0 / 60.0)
		await process_frame
	var session: GwSession = main.session
	var rock := session.spawn_point() + Vector2i(7, 0)
	main.dig_at(rock)
	for frame in FRAMES_AFTER_HIT:
		await process_frame

	var image := root.get_texture().get_image()
	var error := image.save_png(output)
	print("screenshot %s: %s" % ["saved" if error == OK else "failed", ProjectSettings.globalize_path(output)])
	root.remove_child(main)
	main.free()
	for file in DirAccess.get_files_at(STORAGE):
		DirAccess.remove_absolute(STORAGE.path_join(file))
	for directory in DirAccess.get_directories_at(STORAGE):
		var path := STORAGE.path_join(directory)
		for file in DirAccess.get_files_at(path):
			DirAccess.remove_absolute(path.path_join(file))
		DirAccess.remove_absolute(path)
	DirAccess.remove_absolute(STORAGE)
	quit(0 if error == OK else 1)