Server authority

client/systems/network_system.ts

@@ -2,6 +2,10 @@ import { System } from "$/common/ecs/mod.ts";
 import { Position } from "$/common/components/position.ts";
 import { ClientWorld } from "../client_world.ts";
 import { Camera } from "../components/camera.ts";
+import { Container, ItemStack } from "$/common/inventory.ts";
+import { PlayerComponent } from "../player.ts";
+import { GuiContainer } from "../gui/gui_container.ts";
+import { show_fatal_error } from "../fatal.ts";
 
 const MOVE_SEND_INTERVAL = 1 / 10;
 const REMOTE_PLAYER_SMOOTHING = 12;
@@ -11,9 +15,9 @@ export class NetworkSystem extends System {
 
 	update(world: ClientWorld, delta: number): void {
 		const connection = world.connection;
-		if (!connection) {
-			return;
-		}
+		const [local_player] = world.get_tag("player")!;
+		const player_component = local_player.get(PlayerComponent)!;
+		const inventories = player_component.inventories;
 
 		for (const message of connection.incoming) {
 			switch (message.type) {
@@ -41,13 +45,47 @@ export class NetworkSystem extends System {
 				case "chat":
 					world.add_chat(message.from ? `<${message.from}> ${message.text}` : message.text);
 					break;
+				case "container": {
+					let container = message.container === "screen"
+						? inventories.screen
+						: inventories[message.container];
+					if (message.container === "screen" && container?.size !== message.items.length) {
+						container = inventories.screen = new Container(message.items.length);
+					}
+					container?.load(message.items);
+					break;
+				}
+				case "cursor":
+					inventories.cursor.item = message.item ? ItemStack.from_data(message.item) : undefined;
+					break;
+				case "open_screen": {
+					// replace anything open locally without telling the server, it just opened this one
+					player_component.screens.length = 0;
+					const size = Math.max(0, ...message.layout.slots.map((slot) => slot.index + 1));
+					inventories.screen = new Container(size);
+					player_component.screens.push(
+						new GuiContainer(inventories, (m) => connection.send(m), message.layout, message.properties),
+					);
+					break;
+				}
+				case "screen_properties": {
+					const screen = player_component.screens.at(-1);
+					if (screen instanceof GuiContainer) {
+						screen.properties = message.properties;
+					}
+					break;
+				}
+				case "close_screen":
+					// closed by the server (the block broke), it already put everything back
+					player_component.screens = player_component.screens.filter((s) => !(s instanceof GuiContainer));
+					inventories.screen = undefined;
+					break;
 			}
 		}
 		connection.incoming.length = 0;
 
 		if (connection.closed) {
-			world.add_chat("Lost connection to the server");
-			world.connection = undefined;
+			show_fatal_error("Lost connection to the server");
 			return;
 		}