// ws://<host>/realtime/chat — a broadcast chat room.
//
// The whole client side is the framework's realtime runtime (the /chat page just
// declares `data-room="chat"`). Here we only handle room events.
import { defineRoom } from "@wrnexus/core";

type ChatIn = { user?: string; text?: string };

export default defineRoom({
  onConnect(client) {
    // Tell everyone else someone joined (the joiner sees the status badge).
    client.broadcast({ type: "system", text: "A user joined", online: client.room.count() });
  },

  onMessage(client, msg: ChatIn) {
    const text = String(msg.text ?? "")
      .slice(0, 500)
      .trim();
    if (!text) return;
    const user = String(msg.user ?? "anon").slice(0, 40) || "anon";
    // Broadcast to the whole room, including the sender, so everyone stays in sync.
    client.room.broadcast({ type: "message", user, text });
  },

  onLeave(client) {
    client.broadcast({ type: "system", text: "A user left", online: client.room.count() - 1 });
  },
});