extends Node


@export var listen_ip:String = "127.0.0.1":
	set = set_ip


func set_ip(value):
	listen_ip = value
	disconnect_server()


@export var listen_port:int = 33333:
	set = set_port


func set_port(value:int):
	listen_port = value
	disconnect_server()


@export var username:String = "":
	set = set_username


func set_username(value):
	username = value
	disconnect_server()


@export var player_position:Node = null :
	set = set_player_position


func set_player_position(value:Node3D):
	player_position = value


enum Connexion{
	NONE,
	ACCOUNT_REFUSED,
	CONNECTING,
	CONNECTED,
}


@export var state_connexion:Connexion = Connexion.NONE

@export var id:int = 0:
	get:
		return id
	set(value):
		id = value


signal connexion_updated(new_state)
signal update_my_position(pos)
signal update_player_position(id, pos)
signal remove_player(id)


var enet:ENetConnection
var dataEnet:ENetPacketPeer 
var errorEnet:Error


func get_id() -> int:
	return id


func is_offline() -> bool:
	return state_connexion != Connexion.CONNECTED


func update_state(value):
	state_connexion = value
	connexion_updated.emit(state_connexion)


func disconnect_server():
	update_state(Connexion.NONE)


func create_server_enet():
	print("------ create_server_enet")
	enet = ENetConnection.new()
	errorEnet = enet.create_host(10)
	if errorEnet != OK:
		print("ERROR ENET.create_host: ", errorEnet)
		return


func connect_to_host():
	print("Connect to : " + listen_ip + " : " + str(listen_port))
	dataEnet = enet.connect_to_host(listen_ip, listen_port, 10)
	print(dataEnet)
	if not dataEnet:
		print("ERROR dataEnet == null: ")
		return
	elif not dataEnet.is_active():
		print("ERROR enet.connect_to_host: ", dataEnet.is_active())
		return
	update_state(Connexion.CONNECTING)


func connect_server():
	if username == "":
		return
	if player_position == null:
		return
	create_server_enet()
	connect_to_host()


func _ready():
	print("------ Multi initliazed")
	update_state(Connexion.NONE)


func bad_account():
	set_username("")
	update_state(Connexion.ACCOUNT_REFUSED)


func get_event_received():
	var data = dataEnet.get_packet()
	#print("get: ", data)
	if data[0] == 1: # Return connexion
		if data[1] == 0: # OK
			id = data.decode_u64(2)
			var x = data.decode_double(2+8)
			var y = data.decode_double(2+16)
			var z = data.decode_double(2+24)
			print("MyID:", id)
			#print("id:", id, " x:", x, " y:", y, " z:", z)
			update_my_position.emit(Vector3(x, y, z))
			#self.set_player_position(Vector3(x, y, z))
			update_state(Connexion.CONNECTED)
		else: # KO
			bad_account()
	elif data[0] == 3: # Get position
		if id == 0:
			return
		var nb = data[1]
		var pos = 2
		for i in nb:
			var mid = data.decode_u64(pos)
			var mx = data.decode_double(pos+8)
			var my = data.decode_double(pos+16)
			var mz = data.decode_double(pos+24)
			pos += 32
			if mid == id:
				#print("Me id:", mid, " x:", mx, " y:", my, " z:", mz)
				continue
			update_player_position.emit(mid, Vector3(mx, my, mz))
		var nbuserremove = data[pos]
		pos += 1
		for i in nbuserremove:
			var mid = data.decode_u64(pos)
			pos += 8
			if mid == id:
				print("Try to remove me :", mid)
				continue
			remove_player.emit(mid)


func send_account():
	var data:PackedByteArray = PackedByteArray()
	
	data.append(1)
	data.append(len(username))
	var packed_array = username.to_ascii_buffer()
	data += packed_array

	print(username, " -> size:", data.size(), " / " , len(username) )
	errorEnet = dataEnet.send(1, data, 1)
	if errorEnet != OK:
		print("ERROR ENET: ", errorEnet)
		return


func get_player_position():
	if state_connexion != Connexion.CONNECTED:
		return
	var pos:PackedFloat64Array = PackedFloat64Array()
	var posRaw:Vector3 = player_position.get_position()
	pos.append(posRaw.x)
	pos.append(posRaw.y)
	pos.append(posRaw.z)
	var data:PackedByteArray = PackedByteArray()
	data += pos.to_byte_array()
	errorEnet = dataEnet.send(2, data, 1)
	if errorEnet == ERR_UNCONFIGURED:
		update_state(Connexion.NONE)
	elif errorEnet != OK:
		print("ERROR ENET: ", errorEnet)
		return


func _process(_delta):
	if state_connexion == Connexion.ACCOUNT_REFUSED:
		return
	elif state_connexion == Connexion.NONE:
		connect_server()
		return
	get_player_position()
	if state_connexion == Connexion.CONNECTING:
		send_account()
	if dataEnet.get_state() == ENetPacketPeer.STATE_CONNECTED:
		var event = enet.service()
		if event[0] == ENetConnection.EVENT_RECEIVE:
			get_event_received()
	elif dataEnet.get_state() == ENetPacketPeer.STATE_CONNECTING:
		var event = enet.service()
		if event[0] == ENetConnection.EVENT_RECEIVE:
			pass
	elif dataEnet.get_state() ==  ENetPacketPeer.STATE_DISCONNECTED:
		var _event = enet.service()
		print("STATE_DISCONNECTED")
	elif dataEnet.get_state() ==  ENetPacketPeer.STATE_ACKNOWLEDGING_CONNECT:
		var _event = enet.service()
		print("STATE_ACKNOWLEDGING_CONNECT")
	elif dataEnet.get_state() ==  ENetPacketPeer.STATE_CONNECTION_PENDING:
		var _event = enet.service()
		print("STATE_CONNECTION_PENDING")
	elif dataEnet.get_state() ==  ENetPacketPeer.STATE_CONNECTION_SUCCEEDED:
		var _event = enet.service()
		print("STATE_CONNECTION_SUCCEEDED")
	elif dataEnet.get_state() ==  ENetPacketPeer.STATE_DISCONNECT_LATER:
		var _event = enet.service()
		print("STATE_DISCONNECT_LATER")
	elif dataEnet.get_state() ==  ENetPacketPeer.STATE_DISCONNECTING:
		var _event = enet.service()
		print("STATE_DISCONNECTING")
	elif dataEnet.get_state() ==  ENetPacketPeer.STATE_ACKNOWLEDGING_DISCONNECT:
		var _event = enet.service()
		print("STATE_ACKNOWLEDGING_DISCONNECT")
	elif dataEnet.get_state() ==  ENetPacketPeer.STATE_ZOMBIE:
		var _event = enet.service()
		print("STATE_ZOMBIE")
	else:
		var _event = enet.service()
		print("STATE_UNKNOWN")