# Session Persistence Implementation - Summary

## Changes Made

Successfully implemented client-side session persistence to fix multi-turn conversation bug.

### File Modified
**`connectonion-ts/src/connect.ts`**

---

## Changes Detail

### 1. Updated SessionState Interface (Line 368)

**Added:**
```typescript
_savedAt?: number;  // Internal: timestamp for client-side persistence
```

**Purpose:** Track when session was saved for future cleanup (application layer decides policy).

---

### 2. Updated _clearSessionId() Method (Line 681)

**Before:**
```typescript
private _clearSessionId(): void {
  // Only cleared active session_id
  localStorage.removeItem('connectonion_active_session');
}
```

**After:**
```typescript
private _clearSessionId(): void {
  // Get active session_id and clear its data
  const activeId = localStorage.getItem('connectonion_active_session');
  if (activeId) {
    this._clearSession(activeId);  // NEW: Clear full session data
  }
  localStorage.removeItem('connectonion_active_session');
}
```

**Purpose:** When clearing session_id, also clear the full session data from localStorage.

---

### 3. Added Session Persistence Methods (Line 693)

**New methods:**

```typescript
private _saveSession(session: SessionState): void
  // Save full session to localStorage with timestamp
  // Key: 'connectonion_session_{session_id}'

private _loadSession(sessionId: string): SessionState | null
  // Load session from localStorage
  // Returns null if not found

private _loadActiveSessionId(): string | null
  // Get active session_id from localStorage
  // Key: 'connectonion_active_session'

private _clearSession(sessionId: string): void
  // Clear specific session from localStorage
  // Key: 'connectonion_session_{session_id}'
```

**Purpose:** Infrastructure for saving/loading sessions to/from localStorage.

---

### 4. Load Session Before INPUT (Line 858)

**Added:**
```typescript
// Try to restore session from localStorage if not in memory
const activeSessionId = this._loadActiveSessionId();
if (activeSessionId && !this._currentSession) {
  const loaded = this._loadSession(activeSessionId);
  if (loaded) {
    this._currentSession = loaded;
  }
}
```

**Purpose:** Restore conversation context after browser refresh.

**When it triggers:**
- Browser refresh (memory cleared, localStorage has session)
- First message after page reload
- Any time _currentSession is null but localStorage has data

---

### 5. Save Session on OUTPUT (Line 1091)

**Before:**
```typescript
if (data.session) {
  this._currentSession = data.session;
}
```

**After:**
```typescript
if (data.session) {
  this._currentSession = data.session;
  this._saveSession(data.session);  // NEW: Save for next message
}
```

**Purpose:** Persist updated session state after each agent response.

---

### 6. Removed clearSessionId() on Success (Line 1104)

**Before (THE BUG!):**
```typescript
this._activeWs = null;
this._clearSessionId();  // ❌ Clears after EVERY successful message!
try { ws.close(); } catch { /* ignore */ }
resolve({ text: result, done: true });
```

**After (THE FIX!):**
```typescript
this._activeWs = null;
// Don't clear session - keep for next message in conversation
try { ws.close(); } catch { /* ignore */ }
resolve({ text: result, done: true });
```

**Purpose:** **This is the main bug fix!** Keep session alive for multi-turn conversations.

---

### 7. Updated reset() Method (Line 494)

**Added:**
```typescript
// Clear session from localStorage
if (this._currentSession?.session_id) {
  this._clearSession(this._currentSession.session_id);
}
this._clearSessionId();
```

**Purpose:** When user explicitly resets conversation, clear from localStorage too.

---

## Behavior Changes

### Before (Bug)
```
User: "What is Python?"
Agent: "Python is a programming language..."
  → Session saved then IMMEDIATELY cleared ❌

User: "Tell me more"
  → No session in memory
  → No session in localStorage
  → Fresh conversation, no context ❌
Agent: "Tell me more about what?"
```

### After (Fixed)
```
User: "What is Python?"
Agent: "Python is a programming language..."
  → Session saved and KEPT ALIVE ✅

User: "Tell me more"
  → Session in memory
  → Or loaded from localStorage if refreshed
  → Full conversation context ✅
Agent: "Python emphasizes readability and simplicity..."
```

---

## When Session is Cleared

**Kept alive:**
- ✅ Successful OUTPUT (multi-turn conversations)
- ✅ Connection still active

**Cleared:**
- ✅ Connection error
- ✅ Connection timeout
- ✅ WebSocket close
- ✅ User calls `reset()`

---

## Testing Checklist

- [x] Build succeeds without errors
- [ ] First message creates new session
- [ ] Second message continues conversation (has context)
- [ ] Browser refresh preserves conversation
- [ ] Connection error clears session
- [ ] `reset()` clears session
- [ ] Multi-turn conversations work

---

## Total Changes

- **Lines added:** ~80 lines
- **Lines removed:** 1 line (the bug!)
- **Methods added:** 4 helper methods
- **Methods modified:** 3 methods
- **Interfaces updated:** 1 interface

---

## Design Principles Followed

1. **SDK is simple** - Just save/load/clear, no policy decisions
2. **Application decides cleanup** - SDK doesn't auto-delete old sessions
3. **Session ID is the flag** - Different conversations = different IDs
4. **No over-engineering** - No TTL, no count limits, no auto-cleanup in SDK
5. **Separation of concerns** - SDK persists, application manages

---

## Next Steps (Application Layer)

The SDK now provides session persistence infrastructure. Applications (like oo-chat) can add their own cleanup policies:

```typescript
// Example: oo-chat could add conversation limit
createConversation: (sessionId, agentAddress) => {
  set(state => ({
    // Keep only last 100 conversations
    conversations: [newConv, ...state.conversations].slice(0, 100)
  }))
}
```

But this is **optional** and **application's choice** - not SDK's responsibility.
