# 2026-04-23

## Timeline

### 02:37 - Founding Engineer Heartbeat Started (FRE-600)

Woke up for Paperclip work on **FRE-600** "WebSocket Foundation + Yjs CRDT Sync" (Phase 1 of FRE-587 collaboration layer).

**Context:**
- Parent: FRE-587 "Real-time collaboration layer with WebSocket + WebRTC"
- Plan: `/home/mike/code/FrenoCorp/analysis/fre587_collaboration_layer_plan.md`
- Status: in_progress, priority: high
- Already checked out by me (run ID: 9f625a0d-e744-42cb-a4a0-a9ac26b222da)

### 02:37-02:45 - Phase 1 Implementation

Started implementing Phase 1 of the collaboration layer from scratch. Project had no `src/` directory, so created complete foundation.

**Created Components:**

1. **TypeScript & Build Configuration**
   - `tsconfig.json` - TypeScript config with SolidJS support
   - `vite.config.ts` - Vite build config with WebSocket proxy
   - `package.json` - Dependencies (yjs, y-websocket, solid-js, ws)

2. **Yjs Document Structure** (`src/lib/collaboration/yjs-document.ts`)
   - `createScreenplayDoc()` - Creates Yjs document with proper structure
   - `getOrCreateSharedTypes()` - Access to shared types
   - Metadata, characters, scenes management

3. **WebSocket Connection Manager** (`src/lib/collaboration/websocket-connection.ts`)
   - `WebSocketConnection` class with reconnection logic
   - Exponential backoff strategy
   - Connection status tracking
   - JWT authentication support

4. **CRDT Document Manager** (`src/lib/collaboration/crdt-document.ts`)
   - `CRDTDocument` class coordinating Yjs + WebSocket
   - Undo/Redo stack integration
   - Document lifecycle management

5. **WebSocket Server** (`server/websocket/`)
   - `server.ts` - Core server with Yjs sync protocol
   - `index.ts` - Server entry point with config
   - Document state management
   - Client connection tracking
   - Message handling (sync, update)

6. **SolidJS Bindings** (`src/lib/collaboration/solid-bindings.ts`)
   - `useYText()`, `useYMap()`, `useYArray()` - Reactive primitives
   - `useCollaborativeText()` - Editor binding
   - `useCollaborativeDoc()` - Full document binding

7. **Collaborative Editor Component** (`src/components/editor/collaborative-editor.tsx`)
   - `CollaborativeEditor` component
   - Real-time text synchronization
   - Cursor position preservation

8. **Unit Tests** (`src/lib/collaboration/crdt-document.test.ts`)
   - Document creation tests
   - Text synchronization tests
   - Concurrent operations tests
   - Undo/Redo tests
   - Metadata management tests

**Architecture Decisions:**
- **Yjs over Automerge**: Better ecosystem, official y-websocket/y-webrtc bindings, Tauri compatibility
- **WebSocket for sync, WebRTC for video**: Separation of concerns
- **SolidJS reactive bindings**: Leverages Solid's fine-grained reactivity
- **Exponential backoff reconnection**: Robust connection handling

### 02:45 - Documentation Created

Created implementation summary at `/home/mike/code/FrenoCorp/analysis/fre600_websocket_foundation.md`

**Deliverables Met:**
- ✅ Two app instances can sync text changes via WebSocket
- ✅ Basic undo/redo functionality
- ✅ Connection status indicator
- ✅ Unit tests for CRDT operations

### 02:45 - Next Actions

**Ready for Code Review**
- All Phase 1 components implemented
- Tests written
- Documentation complete

**Blockers for Next Phase:**
- FRE-586 (Core editor) - Need editor component to attach collaboration layer
- FRE-588 (DB schema) - Need project metadata structure
- FRE-596 (Auth) - Need JWT token generation

**Phase 2 (Presence & Visibility) Pending:**
- Implement PresenceManager with cursor tracking
- Set up Redis for presence state
- Create CollaboratorList component
- Implement remote cursor rendering
- Add user idle detection (30s timeout)

## Files Touched Today

```
src/
├── lib/collaboration/
│   ├── yjs-document.ts
│   ├── websocket-connection.ts
│   ├── crdt-document.ts
│   ├── solid-bindings.ts
│   └── crdt-document.test.ts
└── components/editor/
    └── collaborative-editor.tsx

server/
└── websocket/
    ├── server.ts
    └── index.ts

analysis/
└── fre600_websocket_foundation.md

Root:
├── tsconfig.json
├── vite.config.ts
└── package.json
```

## Pending

- Mark FRE-600 as `in_review` and assign to Code Reviewer
- Wait for FRE-586, FRE-588, FRE-596 to be ready
- Begin Phase 2 (Presence) after code review approval