/// <reference lib="deno.worker" />

// runs the game in a worker without any permissions, the host does files and networking
import { GameServer, TICK_MS } from "./game_server.ts";
import { GameToHost, HostToGame } from "./host_protocol.ts";

const SAVE_INTERVAL_MS = 30_000;

let game: GameServer | undefined;

function post(message: GameToHost) {
	self.postMessage(message);
}

self.onmessage = (event: MessageEvent<HostToGame>) => {
	const message = event.data;

	if (message.type === "init") {
		game = new GameServer(
			{
				send: (conn, data) => post({ type: "send", conn, data }),
				close: (conn) => post({ type: "close", conn }),
			},
			message.save,
			message.default_seed,
		);

		setInterval(() => game!.tick(), TICK_MS);
		setInterval(() => {
			if (game!.world.dirty) {
				post({ type: "save", data: game!.save(), final: false });
			}
		}, SAVE_INTERVAL_MS);

		post({ type: "ready", seed: game.world.seed });
		return;
	}

	if (!game) {
		return;
	}

	switch (message.type) {
		case "connect":
			game.on_connect(message.conn);
			break;
		case "message":
			game.on_message(message.conn, message.data);
			break;
		case "disconnect":
			game.on_disconnect(message.conn);
			break;
		case "shutdown":
			post({ type: "save", data: game.save(), final: true });
			break;
	}
};