# Session Context - spotlight.cam

**Quick reference for resuming development sessions - optimized for minimal token usage**

---

## Project Overview

**Name:** spotlight.cam
**Purpose:** P2P video exchange app for dance event participants
**Main Feature:** WebRTC P2P video file transfer (no server storage)
**Tech Stack:** React + Vite + Tailwind | Node.js + Express + Socket.IO | PostgreSQL 15 | Docker Compose

---

## Current Status

**Phase:** 1 (Backend Foundation) - ✅ COMPLETED
**Progress:** ~50%
**Next Goal:** Phase 2 - Core Features (Matches API, Ratings, WebRTC signaling)

### What Works Now
- ✅ Docker Compose (nginx:8080 + frontend + backend + PostgreSQL)
- ✅ All frontend views with mockups
- ✅ Backend API (Node.js + Express)
- ✅ PostgreSQL database with 6 tables (Prisma ORM)
- ✅ Real authentication (JWT + bcrypt)
- ✅ Real-time chat (Socket.IO for event & match rooms)
- ✅ WebRTC P2P transfer UI mockup

### What's Missing
- ⏳ Matches API (create/accept/list matches)
- ⏳ Ratings API (rate partner after collaboration)
- ⏳ WebRTC signaling (SDP/ICE exchange via Socket.IO)
- ⏳ Actual WebRTC P2P file transfer implementation

---

## Tech Stack

**Infrastructure:**
- Docker Compose (nginx, frontend, backend, PostgreSQL db)
- nginx reverse proxy on port 8080 (API + WebSocket)

**Frontend:**
- React 18 + Vite
- Tailwind CSS v3.4.0 (NOT v4 - compatibility issues)
- React Router
- Context API for state
- socket.io-client for real-time chat

**Backend:**
- Node.js 20 + Express 4.18.2
- Socket.IO 4.8.1 for WebSocket (real-time chat)
- PostgreSQL 15 with Prisma ORM 5.8.0
- bcrypt + JWT authentication
- Jest + supertest for testing (81%+ coverage)

**WebRTC:**
- RTCPeerConnection
- RTCDataChannel (file transfer)
- Chunking (16KB chunks)
- STUN/TURN servers

---

## Project Structure

```
/spotlightcam
├── docker-compose.yml          # nginx + frontend + backend + PostgreSQL
├── nginx/                      # Proxy config (API + WebSocket)
├── frontend/                   # React PWA
│   ├── src/
│   │   ├── pages/             # All views (Login, Register, Events, Chat, Match, Rate, History)
│   │   ├── contexts/          # AuthContext (JWT integration)
│   │   ├── components/        # Layout, Navbar
│   │   ├── services/          # API client, Socket.IO client
│   │   └── mocks/             # Mock data (events, users for UI)
├── backend/                    # Node.js + Express API
│   ├── src/
│   │   ├── controllers/       # Auth, users, events
│   │   ├── middleware/        # Authentication middleware
│   │   ├── routes/            # API routes
│   │   ├── socket/            # Socket.IO server
│   │   ├── utils/             # Auth utils, DB connection
│   │   └── __tests__/         # Jest unit tests
│   └── prisma/                # Database schema, migrations, seed
└── docs/
    ├── SESSION_CONTEXT.md     # This file
    ├── CONTEXT.md             # Full project description
    ├── TODO.md                # Task list
    ├── ARCHITECTURE.md        # Technical details
    ├── COMPLETED.md           # Completed tasks archive
    └── RESOURCES.md           # Learning resources
```

---

## Key Files

**Frontend:**
- `frontend/src/pages/EventChatPage.jsx` - Event chat with Socket.IO real-time messaging
- `frontend/src/pages/MatchChatPage.jsx` - Private chat + WebRTC mockup
- `frontend/src/contexts/AuthContext.jsx` - JWT authentication integration
- `frontend/src/services/api.js` - API client (register, login, users)
- `frontend/src/services/socket.js` - Socket.IO client connection manager

**Backend:**
- `backend/src/server.js` - Express server with Socket.IO integration
- `backend/src/socket/index.js` - Socket.IO server (event/match rooms, 89% coverage)
- `backend/src/controllers/auth.js` - Register, login endpoints
- `backend/src/middleware/auth.js` - JWT authentication middleware
- `backend/src/utils/auth.js` - bcrypt + JWT utilities
- `backend/prisma/schema.prisma` - Database schema (6 tables)

**Config:**
- `docker-compose.yml` - nginx, frontend, backend, PostgreSQL
- `nginx/conf.d/default.conf` - Proxy for /api and /socket.io
- `backend/.env` - Database URL, JWT secret

---

## Database Schema (Implemented - Prisma)

6 tables with relations:
- `users` - id, username, email, password_hash, avatar, created_at
- `events` - id, name, location, start_date, end_date, description, worldsdc_id
- `chat_rooms` - id, event_id, match_id, type (event/private), created_at
- `messages` - id, room_id, user_id, content, type, created_at
- `matches` - id, user1_id, user2_id, event_id, room_id, status, created_at
- `ratings` - id, match_id, rater_id, rated_id, score, comment, created_at

**Migrations:** Applied with Prisma Migrate
**Seed data:** 3 events, 2 users, event chat rooms

---

## User Flow

1. Register/Login
2. Choose event (from worldsdc.com list)
3. Event chat - matchmaking
4. Match confirmation → private 1:1 chat
5. **Select video from gallery** (recorded outside app)
6. **WebRTC P2P transfer** (direct, no server storage) OR link sharing fallback
7. Rate partner (1-5 stars, comment)

---

## Development Guidelines

### Code Language
- **All code, strings, UI text, comments:** ENGLISH
- **Variable/function names:** ENGLISH
- **Communication with developer:** POLISH

### Git Commits
- Standard format, NO mentions of AI/automatic generation
- ✅ Good: `feat: add WebRTC P2P video transfer`
- ❌ Bad: `feat: add video transfer (generated by AI)`

### Important Decisions
- Port 8080 (port 80 was occupied)
- Tailwind CSS v3.4.0 (v4 has breaking changes with Vite)
- Mock authentication uses localStorage
- All UI text in English

---

## Next Steps (Phase 2 - Core Features)

**Priority:** HIGH
**Estimated Time:** 12-15 hours

### Step 1: Matches API (3-4h)
- `POST /api/matches` - Create match request
- `POST /api/matches/:id/accept` - Accept match
- `GET /api/matches` - List user's matches
- Frontend integration (match request flow)
- Tests

### Step 2: Ratings API (2-3h)
- `POST /api/ratings` - Submit rating after collaboration
- `GET /api/users/:id/ratings` - Get user's ratings
- Frontend integration (rating form)
- Tests

### Step 3: WebRTC Signaling (3-4h)
- Socket.IO events for SDP/ICE exchange
- Signaling flow (offer/answer/ice-candidate)
- Frontend WebRTC setup (RTCPeerConnection)
- Connection establishment tests

### Step 4: WebRTC File Transfer (4-5h)
- RTCDataChannel setup
- File chunking (16KB chunks)
- Progress monitoring (sender & receiver)
- Error handling & reconnection
- Complete P2P video transfer flow

---

## Common Commands

**Start project:**
```bash
docker compose up --build
```

**Access:**
- Frontend: http://localhost:8080
- Backend API: http://localhost:8080/api
- Socket.IO: ws://localhost:8080/socket.io
- Health check: http://localhost:8080/api/health

**Rebuild after changes:**
```bash
docker compose down
docker compose up --build
```

**Git:**
```bash
git status
git add .
git commit -m "feat: description"
```

---

## Known Issues & Solutions

### Issue: Tailwind v4 compatibility error
**Solution:** Downgraded to Tailwind v3.4.0
```bash
npm install -D tailwindcss@^3.4.0
```

### Issue: Port 80 already allocated
**Solution:** Changed nginx port to 8080 in docker-compose.yml

### Issue: Prisma OpenSSL error in Alpine Linux
**Solution:** Added OpenSSL to Dockerfile
```dockerfile
RUN apk add --no-cache openssl
```

---

## WebRTC Implementation Notes (Future)

**Main functionality - P2P file transfer:**
- RTCPeerConnection for connection establishment
- RTCDataChannel for binary data transfer
- File chunking (16KB chunks recommended)
- Progress monitoring (both sender and receiver)
- Metadata exchange (filename, size, MIME type)
- Error handling and reconnection logic
- Fallback: link sharing (Google Drive, Dropbox)

**Signaling:**
- WebSocket (Socket.IO) for SDP/ICE exchange
- Server only for signaling, NOT for file storage

**Security:**
- WebRTC native encryption (DTLS/SRTP)
- Optional: additional chat encryption (WebCrypto API)

---

## Quick Reference - Frontend Routes

- `/login` - Login page
- `/register` - Registration page
- `/events` - Event list
- `/events/:id/chat` - Event chat (public)
- `/matches/:id/chat` - Private 1:1 chat + WebRTC mockup
- `/matches/:id/rate` - Rate partner
- `/history` - Match history

---

## Quick Reference - Mock Data

**Mock User (logged in):**
- ID: 1
- Username: john_doe
- Email: john@example.com

**Mock Events:**
- ID: 1 - Warsaw Dance Festival 2025
- ID: 2 - Swing Camp Barcelona 2025
- ID: 3 - Blues Week Herräng 2025

---

## Files to Read for Full Context

**Minimal (for quick start):**
- `docs/SESSION_CONTEXT.md` (this file)
- `docker-compose.yml`
- `frontend/src/pages/MatchChatPage.jsx` (WebRTC mockup)

**Full context:**
- `docs/CONTEXT.md` (project description)
- `docs/TODO.md` (task list)
- `docs/ARCHITECTURE.md` (technical details)

**Archives:**
- `docs/COMPLETED.md` (completed tasks)
- `docs/RESOURCES.md` (learning resources)

---

**Last Updated:** 2025-11-12
**Phase 1 Status:** ✅ COMPLETED - Backend Foundation (Express + PostgreSQL + JWT + Socket.IO)
**Next Phase:** Phase 2 - Core Features (Matches API + Ratings + WebRTC)