extends SceneTree
## A second instance of the game for the test of two instances. It starts the
## real main scene as a guest, hits the rock beside the spawn clearing until
## it has a stone, follows the host until the host stops at a tick, and
## writes what its world looks like then as JSON.
##
## The test of two instances starts it; by hand:
##   godot --headless --path game -s res://tools/guest_bot.gd -- --join=ADDRESS
##     --storage=FOLDER --until=TICK --out=FILE

## Milliseconds the bot waits for everything before it gives up.
const PATIENCE_MSEC := 20000


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


func _run() -> void:
	var settings := {}
	for argument in OS.get_cmdline_user_args():
		settings[argument.get_slice("=", 0)] = argument.get_slice("=", 1)
	var until := int(settings.get("--until", "0"))
	var report := {"error": "the host did not answer"}

	var main: Node = load("res://main.tscn").instantiate()
	main.storage_dir = settings.get("--storage", "user://bot")
	main.command_line = PackedStringArray(["--join=" + settings.get("--join", ""), "--name=Bot"])
	root.add_child(main)

	var started := Time.get_ticks_msec()
	while Time.get_ticks_msec() - started < PATIENCE_MSEC:
		await process_frame
		var session: GwSession = main.session
		if session == null:
			report = {"error": "the session ended: %s" % main.menu.status()}
			break
		if session.local_player() < 0:
			continue
		var rock := session.spawn_point() + Vector2i(7, -2)
		if session.item_count(GwSession.ITEM_STONE) == 0:
			main.dig_at(rock)
		if session.tick() == until and session.pending_ticks() == 0:
			report = {
				"tick": session.tick(),
				"hash": session.state_hash_hex(),
				"player": session.local_player(),
				"stones": session.item_count(GwSession.ITEM_STONE),
				"resyncs": main.resyncs,
			}
			break

	var file := FileAccess.open(settings.get("--out", "user://bot.json"), FileAccess.WRITE)
	file.store_string(JSON.stringify(report))
	file.close()
	main.notification(Node.NOTIFICATION_WM_CLOSE_REQUEST)
	root.remove_child(main)
	main.free()
	quit(0 if not report.has("error") else 1)