Redo Player.IsLocal and .PeerId

- IsLocal is now false by default and
  set in the editor for the local player.
- PeerId is calculated from and sets the node's
  Name instead of having its own backing field.
- Add GetPlayerByPeerId to MultiplayerManager.

game.tscn

@@ -30,6 +30,7 @@ PlayerScene = ExtResource("2_iv2f7")
 [node name="Players" type="Node3D" parent="."]
 
 [node name="Local" parent="Players" instance=ExtResource("2_iv2f7")]
+IsLocal = true
 
 [node name="OutlineViewportContainer" type="SubViewportContainer" parent="."]
 material = SubResource("ShaderMaterial_ke1l3")

player/Player.cs

@@ -1,7 +1,18 @@
 public partial class Player : CharacterBody3D
 {
-	public bool IsLocal { get; set; } = true;
-	public int PeerId { get; set; }
+	[Export] public bool IsLocal { get; set; }
+
+	public int PeerId {
+		get {
+			if (int.TryParse(Name, out var result)) return result;
+			throw new InvalidOperationException($"'{Name}' could not be parsed to PeerId");
+		}
+		set {
+			if (value > 0) Name = value.ToString();
+			else if (IsLocal) Name = "Local";
+			else throw new InvalidOperationException("Non-local player can't have PeerId set to 0");
+		}
+	}
 
 	public MovementController  Movement  { get; private set; }
 	public CameraController    Camera    { get; private set; }

scripts/MultiplayerManager.cs

@@ -16,6 +16,10 @@ public partial class MultiplayerManager : Node
 	}
 
 
+	public Player GetPlayerByPeerId(int peerId)
+		=> Players.GetNode<Player>(peerId.ToString());
+
+
 	public void Connect(string address, ushort port)
 	{
 		var peer = new ENetMultiplayerPeer();
@@ -41,7 +45,7 @@ public partial class MultiplayerManager : Node
 	void OnMultiplayerReady()
 	{
 		var localId = Multiplayer.GetUniqueId();
-		LocalPlayer.Name = localId.ToString();
+		LocalPlayer.PeerId = localId;
 		LocalPlayer.SetMultiplayerAuthority(localId);
 
 		if (!Multiplayer.IsServer())
@@ -53,9 +57,10 @@ public partial class MultiplayerManager : Node
 
 	void OnMultiplayerDisconnected()
 	{
-		LocalPlayer.Name = "Local";
-		foreach (var player in Players.GetChildren().Cast<Player>())
-			if (!player.IsLocal) OnPeerDisconnected(player.PeerId);
+		foreach (var player in Players.GetChildren().Cast<Player>()) {
+			if (player.IsLocal) player.PeerId = 0;
+			else OnPeerDisconnected(player.PeerId);
+		}
 		Multiplayer.MultiplayerPeer.Close();
 		Multiplayer.MultiplayerPeer = null;
 	}
@@ -65,8 +70,6 @@ public partial class MultiplayerManager : Node
 	{
 		var player = PlayerScene.Instantiate<Player>();
 		player.SetMultiplayerAuthority((int)peerId);
-		player.Name = peerId.ToString();
-		player.IsLocal = false;
 		player.PeerId = (int)peerId;
 		Players.AddChild(player);
 		PlayerJoined?.Invoke(player);
@@ -74,7 +77,7 @@ public partial class MultiplayerManager : Node
 
 	void OnPeerDisconnected(long peerId)
 	{
-		var player = Players.GetNode<Player>(peerId.ToString());
+		var player = GetPlayerByPeerId((int)peerId);
 		PlayerLeft?.Invoke(player);
 		player.QueueFree();
 	}