extends Node

signal player_registered(peer_id: int, player_info: Dictionary)
signal network_error(message: String)

const DEFAULT_PORT: int = 10567
const MAX_PEERS: int = 20

var players := {}
var is_dedicated: bool = false

var _peer: ENetMultiplayerPeer
var _local_player_info := {"name": ""}

var _title_scene := preload("res://scenes/title.tscn")
var _main_scene := preload("res://scenes/main.tscn")
var _player_scene := preload("res://scenes/player.tscn")


func _ready() -> void:
	multiplayer.peer_connected.connect(_on_multiplayer_peer_connected)
	multiplayer.peer_disconnected.connect(_on_multiplayer_peer_disconnected)
	multiplayer.connected_to_server.connect(_on_multiplayer_connected_to_server)
	multiplayer.connection_failed.connect(_on_multiplayer_connection_failed)
	multiplayer.server_disconnected.connect(_on_multiplayer_server_disconnected)


func _process(_delta: float) -> void:
	Debugger.text("_local_player_info", _local_player_info)
	Debugger.text("players", players)


func set_local_player_info(username: String) -> void:
	_local_player_info["name"] = username


func host_game(dedicated: bool = false) -> void:
	print("Hosting...")
	is_dedicated = dedicated
	_peer = ENetMultiplayerPeer.new()
	var error := _peer.create_server(DEFAULT_PORT, MAX_PEERS)

	if error:
		match error:
			ERR_ALREADY_IN_USE:
				var message := "Already in use"
				printerr(message)
				network_error.emit(message)
			ERR_CANT_CREATE:
				var message := "Cannot create server"
				printerr(message)
				network_error.emit(message)
		return

	multiplayer.set_multiplayer_peer(_peer)

	_load_main()

	if not dedicated:
		players[1] = _local_player_info
		print("Registered player ", 1, " ", _local_player_info)
		_add_player(multiplayer.get_unique_id(), _local_player_info)


func join_game(address: String) -> void:
	print("Joining " + address + "...")
	_peer = ENetMultiplayerPeer.new()
	var error := _peer.create_client(address, DEFAULT_PORT)

	if error:
		match error:
			ERR_ALREADY_IN_USE:
				var message := "Already in use"
				printerr(message)
				network_error.emit(message)
			ERR_CANT_CREATE:
				var message := "Cannot create client"
				printerr(message)
				network_error.emit(message)
		return

	multiplayer.set_multiplayer_peer(_peer)

	_load_main()


func is_active() -> bool:
	return (
		multiplayer.multiplayer_peer.get_connection_status()
		== MultiplayerPeer.CONNECTION_CONNECTED
	)


func is_dedicated_server() -> bool:
	return OS.has_feature("dedicated_server") or DisplayServer.get_name() == "headless"


func player_name(peer_id: int) -> String:
	if peer_id in players:
		return str(peer_id) + " (" + players[peer_id]["name"] + ")"

	return str(peer_id)


func _switch_scene(to: PackedScene, from: Node) -> void:
	if from:
		from.queue_free()

	var new_scene := to.instantiate()
	get_tree().get_root().add_child(new_scene)
	print("Scene loaded")


func _load_main() -> void:
	print("Loading Main...")
	_switch_scene(_main_scene, $/root/Title)


func _add_player(peer_id: int, player_info: Dictionary) -> void:
	if not multiplayer.is_server():
		return

	print("Adding player ", player_name(peer_id))
	var player := _player_scene.instantiate() as Player
	player.name = str(peer_id)

	Referencer.main.player_holder.add_child(player, true)
	player.set_info(player_info)


func _remove_player(peer_id: int) -> void:
	if not multiplayer.is_server():
		return

	print("Removing player ", player_name(peer_id))
	var player := Referencer.main.player_holder.get_node_or_null(str(peer_id))
	if player:
		player.queue_free()


@rpc("any_peer", "reliable")
func _register_player(player_info: Dictionary) -> void:
	var peer_id := multiplayer.get_remote_sender_id()
	print("Registering player ", peer_id, " ", player_info)
	if peer_id == 1 and !player_info["name"]:
		print("Skipping registering the host")
		return
	players[peer_id] = player_info
	player_registered.emit(peer_id, player_info)


func _on_multiplayer_peer_connected(peer_id: int) -> void:
	print("Peer connected ", peer_id)
	_register_player.rpc_id(peer_id, _local_player_info)
	_add_player(peer_id, _local_player_info)


func _on_multiplayer_peer_disconnected(peer_id: int) -> void:
	print("Peer disconnected ", player_name(peer_id))
	_remove_player(peer_id)
	players.erase(peer_id)


func _on_multiplayer_connected_to_server() -> void:
	var peer_id := multiplayer.get_unique_id()
	print("Connected to server as ", peer_id)
	players[peer_id] = _local_player_info
	print("Registered player ", peer_id, " ", _local_player_info)


func _on_multiplayer_connection_failed() -> void:
	multiplayer.set_multiplayer_peer(null)
	var message := "Connection failed"
	printerr(message)
	network_error.emit(message)


func _on_multiplayer_server_disconnected() -> void:
	var message := "Server disconnected"
	printerr(message)
	players.clear()
	_switch_scene(_title_scene, $/root/Main)
	network_error.emit(message)