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. A second
## figure with a name stands beside it. 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>
##     [--style=NAME] [--showcase]
## --style=NAME draws in that style; --showcase shows the style samples
## instead of the game.

const STORAGE := "user://screenshot-run"
## Frames between the hit and the picture: the burst of chips is still in
## the air, and the crack is there.
const FRAMES_AFTER_HIT := 8
## Seconds into the showcase at which the picture is taken: the plant is
## nearly grown and the animal in the air.
const SHOWCASE_SECONDS := 5.2


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


func _run() -> void:
	var output := "user://screenshot.png"
	var style := ""
	var showcase := false
	for argument in OS.get_cmdline_user_args():
		if argument.begins_with("--style="):
			style = argument
		elif argument == "--showcase":
			showcase = true
		else:
			output = argument
	DirAccess.make_dir_recursive_absolute(STORAGE)
	var main: Node = load("res://main.tscn").instantiate()
	main.storage_dir = STORAGE
	main.command_line = PackedStringArray([style] if not style.is_empty() else [])
	root.add_child(main)
	if showcase:
		main.open_showcase()
		await process_frame
		main.showcase.time = SHOWCASE_SECONDS
		await process_frame
		await process_frame
	else:
		await _play(main)

	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()
	_remove(STORAGE)
	quit(0 if error == OK else 1)


## Plays alone: walks four tiles to the right, toward the rock outcrop
## beside the clearing, and hits it once.
func _play(main: Node) -> void:
	main.play(false)
	await process_frame
	for frame in 48:
		main.avatar.walk(Vector2.RIGHT, 1.0 / 60.0)
		await process_frame
	var session: GwSession = main.session
	main.figures.place(session.local_player(), main.avatar.position + Vector2(-40, 8))
	var rock := session.spawn_point() + Vector2i(7, 0)
	main.dig_at(rock)
	for frame in FRAMES_AFTER_HIT:
		await process_frame


func _remove(path: String) -> void:
	for file in DirAccess.get_files_at(path):
		DirAccess.remove_absolute(path.path_join(file))
	for directory in DirAccess.get_directories_at(path):
		_remove(path.path_join(directory))
	DirAccess.remove_absolute(path)