extends Mod_Base

@export var cache    := ""
@export var nickname := "" # FIXME: Not used for anything yet.
@export var address  := ""
@export var port     := 52410

var main_controller: ModelController

# Temporary positioning system.
# TODO: Add a setting that allows syncing model positions, as an alternative
#       to letting the local player choose where each model is going to appear.
var player_order: Array[int] = []
var starting_offset     := Vector3(-1.25, 0.0, 0.0)
var accumulative_offset := Vector3( 0.35, 0.0, 0.0)

# Allows us to use the "apply_animations" function to apply blendshapes.
var functions_blendshapes: Script = load("res://Mods/MediaPipe/MediaPipeController_BlendShapes.gd")

func _ready() -> void:
	# FIXME: Hardcoded way to get the main model controller.
	main_controller = $"/root/SnekStudio_Main/ModelController"
	main_controller.child_entered_tree.connect(model_changed)

	setup_setting_widget("cache"   , "Cache/LineEdit")
	setup_setting_widget("nickname", "Name/LineEdit" )
	setup_setting_widget("address" , "Host/Address"  )
	setup_setting_widget("port"    , "Host/Port"     )
	setup_button_connections()

	multiplayer.peer_connected     .connect(peer_connected)
	multiplayer.peer_disconnected  .connect(peer_disconnected)
	multiplayer.connected_to_server.connect(connected_to_server)
	multiplayer.connection_failed  .connect(connection_failed)
	multiplayer.server_disconnected.connect(server_disconnected)

func _exit_tree() -> void:
	multiplayer.multiplayer_peer.close()

func _create_settings_window() -> Control:
	return load("res://Mods/copyMultiplayer/Resources/copy_multiplayer_settings.tscn").instantiate()

func setup_setting_widget(setting_name: String, path: NodePath) -> void:
	var settings = get_settings_window()
	var widget: Control = settings.get_node(path)

	_settings_properties.append({ name = setting_name, args = {  } })
	_settings_widgets_by_setting_name[setting_name] = widget

	if widget is LineEdit:
		widget.text_changed.connect(func(text): modify_setting(setting_name, text))
	if widget is SpinBox:
		widget.value_changed.connect(func(number): modify_setting(setting_name, roundi(number)))

func setup_button_connections() -> void:
	var window = get_settings_window()
	window.get_node("Buttons/Join").pressed.connect(join_pressed)
	window.get_node("Buttons/Host").pressed.connect(host_pressed)
	window.get_node("Buttons/Disconnect").pressed.connect(disconnect_pressed)


func join_pressed() -> void:
	var address_widget: LineEdit = get_settings_window().get_node("Host/Address")
	var default_address: String = address_widget.placeholder_text
	var actual_address := default_address if address.is_empty() else address

	var peer := ENetMultiplayerPeer.new()
	if peer.create_client(actual_address, port) == OK:
		multiplayer.multiplayer_peer = peer
		set_status("Connecting ...")
		print_log("Connecting to server")
		update_enabled_state(true)
	else:
		print_log("Unable to connect!")

func host_pressed() -> void:
	var peer := ENetMultiplayerPeer.new()
	if peer.create_server(port) == OK:
		multiplayer.multiplayer_peer = peer
		update_status()
		print_log("Opened server")
		update_enabled_state(true)
	else:
		print_log("Unable to open server!")

func disconnect_pressed() -> void:
	assert(multiplayer.multiplayer_peer)
	if multiplayer.is_server():
		set_status("")
		print_log("Closed server")
		update_enabled_state(false)
	multiplayer.multiplayer_peer.close()


func peer_connected(id: int) -> void:
	update_status()
	print_log(["Player ", id, " connected"])

	var new_controller := ModelController.new()
	new_controller.name = str(id)
	add_child(new_controller)

	player_order.push_back(id)
	update_model_transforms()

	var filename = main_controller._last_loaded_vrm.get_file()
	if filename.is_valid_filename(): change_model.rpc_id(id, filename)

func peer_disconnected(id: int) -> void:
	update_status()
	print_log(["Player ", id, " disconnected"])

	var controller: ModelController = get_node(str(id))
	remove_child(controller)
	controller.queue_free()

	player_order.remove_at(player_order.find(id))
	update_model_transforms()

func connected_to_server() -> void:
	print_log("Connected to server")

func connection_failed() -> void:
	set_status("")
	print_log("Connection failed!")
	update_enabled_state(false)

func server_disconnected() -> void:
	set_status("")
	print_log("Disconnected from server")
	update_enabled_state(false)

	for controller in get_children():
		if controller is ModelController:
			remove_child(controller)
			controller.queue_free()
	
	player_order.clear()


func update_enabled_state(is_online: bool) -> void:
	var window = get_settings_window()
	window.get_node("Name/LineEdit").editable = !is_online
	window.get_node("Host/Address" ).editable = !is_online
	window.get_node("Host/Port"    ).editable = !is_online
	window.get_node("Buttons/Join"      ).disabled =  is_online
	window.get_node("Buttons/Host"      ).disabled =  is_online
	window.get_node("Buttons/Disconnect").disabled = !is_online

func update_model_transforms() -> void:
	var offset := starting_offset
	for id in player_order:
		var controller: ModelController = get_node(str(id))
		controller.position = offset
		offset += accumulative_offset
		update_model_rotation(controller)

## Rotates the model a little bit towards the camera
## so it doesn't appear to be staring into nowhere.
func update_model_rotation(controller: ModelController) -> void:
	var camera  := get_viewport().get_camera_3d()
	var from_2d := Vector2(controller.position.x, controller.position.z)
	var to_2d   := Vector2(camera.position.x, camera.position.z)
	controller.rotation.y = from_2d.angle_to_point(to_2d) / 4 # Magic value, probably depends on FOV.

func update_status() -> void:
	var num_players := 1 + multiplayer.get_peers().size()
	var side := "Hosting" if multiplayer.is_server() else "Connected"
	var s := "s" if num_players != 1 else ""
	set_status([side, ": ", num_players, " player", s])


@rpc("any_peer", "reliable")
func change_model(filename: String) -> void:
	var player_id := multiplayer.get_remote_sender_id()
	var controller := get_node_or_null(str(player_id)) as ModelController
	if not controller: return

	if not filename.is_valid_filename():
		print_log(["ERROR: '", filename, "' is not a valid file name!"])
		return

	var full_path := cache.path_join(filename)
	if not FileAccess.file_exists(full_path):
		print_log(["Player ", player_id, " wanted to switch to '", filename, "', but it could not be found, skipping"])
		return

	if controller.load_vrm(full_path):
		print_log(["Player ", player_id, " switched to '", filename, "'"])
	else:
		print_log(["ERROR: Model '", filename, "' could not be loaded!"])

# Called when a node is added to the main ModelController.
func model_changed(child: Node) -> void:
	if child.name != "Model": return
	# Wait for one frame, then "_last_loaded_vrm" is updated.
	await get_tree().process_frame
	var filename = main_controller._last_loaded_vrm.get_file()
	if filename.is_valid_filename(): change_model.rpc(filename)


# FIXME: This sends way more information than necessary, but works as a proof-of-concept!
@rpc("any_peer", "unreliable_ordered")
func update(
	model_transform: Transform3D,
	shape_dict: Dictionary, # Dictionary[String, float]
	bone_poses: Dictionary, # Dictionary[String, Transform3D]
) -> void:
	var player_id := multiplayer.get_remote_sender_id()
	var controller := get_node_or_null(str(player_id))
	if not controller: return

	var model := controller.get_node_or_null("Model") as Node3D
	if model:
		model.transform = model_transform
		functions_blendshapes.apply_animations(model, shape_dict)

	var skeleton := controller._get_model_skeleton() as Skeleton3D
	if skeleton:
		for bone_name in bone_poses:
			var pose: Transform3D = bone_poses[bone_name]
			var idx := skeleton.find_bone(bone_name)
			if idx != -1: skeleton.set_bone_pose(idx, pose)

func _process(_delta: float) -> void:
	if multiplayer.get_peers().size() == 0: return

	var model    := get_model()
	var skeleton := get_skeleton()
	var media_pipe_ctrl = $"../MediaPipeController"
	if (not model) or (not skeleton) or (not media_pipe_ctrl): return

	var shape_dict = media_pipe_ctrl.blend_shape_last_values
	var bone_poses = {}
	for idx in skeleton.get_bone_count():
		var bone_name = skeleton.get_bone_name(idx)
		var bone_pose = skeleton.get_bone_pose(idx)
		bone_poses[bone_name] = bone_pose
	update.rpc(model.transform, shape_dict, bone_poses)