extends SceneTree

const MainScene: PackedScene = preload("res://main/main.tscn")
const TEST_PORT: int = 18222


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


func _run() -> void:
	var arguments: PackedStringArray = OS.get_cmdline_user_args()
	if arguments.has("host"):
		await _run_host()
		return
	if arguments.has("client"):
		await _run_client()
		return
	push_error("Home spawn validation needs host or client mode.")
	quit(1)


func _run_host() -> void:
	var main: Node = await _create_initialized_main()
	var session := main.get_node("%NetworkSession") as NetworkSession
	var network_home := main.get_node(
		"%NetworkHomeService"
	) as NetworkHomeService
	var home_world := main.get_node("%HomeWorldService") as HomeWorldService
	var spawn_service := main.get_node(
		"%PlayerSpawnService"
	) as PlayerSpawnService
	var save_manager := main.get("_save_manager") as PlayerSaveManager
	assert(bool(main.call(
		"_apply_world", WorldLayout.STARTER_ISLAND, 1, true
	)))
	assert(bool(main.call(
		"_prepare_host_world", WorldLayout.STARTER_ISLAND, 1
	)))
	assert(save_manager.initialize_new_game(1, WorldLayout.STARTER_ISLAND))
	assert(session.start_private_host(TEST_PORT))
	main.call("_enter_gameplay")
	assert(session.set_host_open(true))

	var host_fingerprint: String = session.get_local_identity_fingerprint()
	assert(await _wait_for_home(network_home, host_fingerprint))
	var host_avatar: Player = spawn_service.get_avatar(1)
	var host_spawn: Transform3D = home_world.get_exterior_spawn_transform(
		host_fingerprint
	)
	assert(_same_door_position(host_avatar.global_position, host_spawn.origin))
	assert(_faces_away_from_home(host_avatar, home_world, host_fingerprint))
	assert(network_home.request_enter(host_fingerprint))
	await physics_frame
	host_avatar.global_position = home_world.get_interior_exit_position(
		host_fingerprint
	)
	assert(network_home.request_exit())
	await physics_frame
	assert(_same_door_position(host_avatar.global_position, host_spawn.origin))
	assert(_faces_away_from_home(host_avatar, home_world, host_fingerprint))

	var remote_peer_id: int = await _wait_for_remote_peer(session)
	assert(remote_peer_id > 1)
	var remote_record := session.get_peer_record(remote_peer_id)
	var remote_fingerprint: String = remote_record.identity_fingerprint
	assert(await _wait_for_home(network_home, remote_fingerprint))
	var remote_avatar: Player = spawn_service.get_avatar(remote_peer_id)
	var remote_spawn: Transform3D = home_world.get_exterior_spawn_transform(
		remote_fingerprint
	)
	assert(_same_door_position(
		remote_avatar.global_position, remote_spawn.origin
	))
	assert(_faces_away_from_home(
		remote_avatar, home_world, remote_fingerprint
	))

	var disconnect_deadline: int = Time.get_ticks_msec() + 12000
	while (
		Time.get_ticks_msec() < disconnect_deadline
		and session.is_authenticated_peer(remote_peer_id)
	):
		await process_frame
	assert(not session.is_authenticated_peer(remote_peer_id))
	print("Home spawn multiplayer host validation: PASS")
	await _cleanup(main, session)


func _run_client() -> void:
	var main: Node = await _create_initialized_main()
	main.call(
		"_on_title_join_game_requested",
		"127.0.0.1:%d" % TEST_PORT,
	)
	var session := main.get_node("%NetworkSession") as NetworkSession
	var network_home := main.get_node(
		"%NetworkHomeService"
	) as NetworkHomeService
	var home_world := main.get_node("%HomeWorldService") as HomeWorldService
	var deadline: int = Time.get_ticks_msec() + 20000
	while Time.get_ticks_msec() < deadline:
		await process_frame
		if session.state == NetworkSession.State.VERIFYING_SERVER_IDENTITY:
			main.call("_confirm_server_trust")
		if session.is_joined_client() and bool(main.get("_gameplay_started")):
			break
	assert(session.is_joined_client())
	var fingerprint: String = session.get_local_identity_fingerprint()
	assert(await _wait_for_home(network_home, fingerprint))
	var player := main.get("_player") as Player
	var exterior_spawn: Transform3D = (
		home_world.get_exterior_spawn_transform(fingerprint)
	)
	deadline = Time.get_ticks_msec() + 5000
	while (
		Time.get_ticks_msec() < deadline
		and not _same_door_position(
			player.global_position, exterior_spawn.origin
		)
	):
		await physics_frame
	assert(_same_door_position(
		player.global_position, exterior_spawn.origin
	))
	assert(_faces_away_from_home(player, home_world, fingerprint))
	print("Home spawn multiplayer client validation: PASS")
	await _cleanup(main, session)


func _create_initialized_main() -> Node:
	root.size = Vector2i(1280, 720)
	var main: Node = MainScene.instantiate()
	root.add_child(main)
	for _frame: int in 4:
		await process_frame
	if not bool(main.get("_application_initialized")):
		main.call("_activate_selected_data_path", "", true)
	for _frame: int in 8:
		await process_frame
	assert(bool(main.get("_application_initialized")))
	return main


func _wait_for_home(
	network_home: NetworkHomeService,
	fingerprint: String,
) -> bool:
	var deadline: int = Time.get_ticks_msec() + 10000
	while Time.get_ticks_msec() < deadline:
		await process_frame
		var manifests: Dictionary = network_home.get(
			"_manifests_by_fingerprint"
		)
		if manifests.has(fingerprint):
			return true
	return false


func _faces_away_from_home(
	avatar: Player,
	home_world: HomeWorldService,
	fingerprint: String,
) -> bool:
	var exterior_basis: Basis = home_world.get_exterior_transform(
		fingerprint
	).basis
	var outward_direction := exterior_basis.z
	outward_direction.y = 0.0
	if outward_direction.is_zero_approx():
		return false
	return avatar.get_facing_direction().dot(
		outward_direction.normalized()
	) >= 0.99


func _wait_for_remote_peer(session: NetworkSession) -> int:
	var deadline: int = Time.get_ticks_msec() + 20000
	while Time.get_ticks_msec() < deadline:
		await process_frame
		for peer_id: int in session.get_authenticated_peer_ids():
			if peer_id != session.get_local_peer_id():
				return peer_id
	return 0


func _same_door_position(first: Vector3, second: Vector3) -> bool:
	return (
		Vector2(first.x, first.z).distance_to(Vector2(second.x, second.z))
			< 0.08
		and absf(first.y - second.y) < 0.3
	)


func _cleanup(main: Node, session: NetworkSession) -> void:
	session.disconnect_session("")
	main.queue_free()
	for _frame: int in 4:
		await process_frame
	await create_timer(0.1).timeout
	quit()