To solve the **desynchronization problem** where **Client 2 sees default state instead of current state**, the AI agent needs to implement **state synchronization on join**. Here's a detailed plan for what needs to be done, which you can feed to an AI agent or developer:

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## ✅ Problem Summary

* **Client 1** changes app state; changes are broadcast via WebSocket.
* **Client 2** joins a session but does **not receive the current state** of all elements—only the default.
* When Client 1 makes further changes, Client 2 sees them, but this causes layout inconsistency since Client 2’s other state is outdated.
* If Client 2 makes changes, it **overwrites** the correct session state.

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## 🧠 What the AI Agent Must Do

### 1. **Server: Maintain the Current State per Session**

* In `server.js`, ensure there is a per-session object (e.g., `{ sessionId: stateObject }`) that stores **all element states**.
* When **Client 1** sends a change message (`{ type: 'update', payload: {...} }`), update that stored session state accordingly.

#### ✅ Example in `server.js`

```js
const sessions = {}; // { [sessionId]: { state: {...}, clients: [] } }

function handleMessage(message, ws, sessionId) {
  const data = JSON.parse(message);
  if (data.type === 'update') {
    // Update session state
    if (!sessions[sessionId].state) sessions[sessionId].state = {};
    sessions[sessionId].state[data.payload.id] = data.payload;
    
    // Broadcast to others
    broadcastExcept(ws, sessionId, message);
  }
}
```

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### 2. **Client 2: Request the Current Session State on Join**

* When Client 2 connects via WebSocket, it must send a message like:

```json
{ "type": "get_state" }
```

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### 3. **Server: Respond to `get_state` with Full State Snapshot**

* On receiving `{ type: 'get_state' }`, send:

```json
{ "type": "session_state", "payload": { ...allCurrentState } }
```

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### 4. **Client 2: Apply the Session State on First Load**

In `useDrumMachine` (or wherever state is applied), handle a new message type:

```ts
if (message.type === 'session_state') {
  applyFullState(message.payload); // update all controls
}
```

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### 5. **(Optional) Mark Synchronization Complete**

* Use a flag like `isSynchronized` on the client to **ignore all inputs** until the full session state is received and applied.

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## 🧩 Where This Fits in Your Code

* In `App.tsx`, you’re already using a `useWebSocket` hook — you’ll need to modify it so that:

  * On `open`, send `get_state`.
  * On receiving `session_state`, trigger state application.

* The actual application of state will happen inside `useDrumMachine`.

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## ✅ Summary Checklist

| Step | Task                                                      |
| ---- | --------------------------------------------------------- |
| ✅    | Store session state on server per `sessionId`             |
| ✅    | Update session state on every change                      |
| ✅    | On new client connect, send `get_state`                   |
| ✅    | Server responds with `session_state`                      |
| ✅    | Client applies full session state before handling updates |
| ⛔    | Don't allow local edits before sync is complete           |

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Would you like help modifying the specific `useWebSocket` or `useDrumMachine` code to support this logic?