# CLAUDE.md

This file provides guidance to Claude Code (claude.ai/code) when working with code in this repository.

## Project Overview

**LiveServer-M1** — образовательная видеоконференц-платформа на базе LiveKit.

Ключевые фичи:
- AI-ассистент: авто-подключение к комнатам, real-time транскрипция (Deepgram), суммаризация лекций (OpenAI GPT)
- Защита от Zoom-bombing: lobby/waiting room, PIN-коды, kick/ban по session fingerprint, panic button
- Пост-лекционная панель: чат, файлы, транскрипт, AI-саммари, экспорт в PDF/Google Drive

Полная спецификация: **`PROMPT.md`**

## Tech Stack

| Слой | Технологии |
|------|-----------|
| Frontend | Next.js 16 (App Router), React 19, TypeScript, Tailwind CSS v4 |
| Video | LiveKit Cloud → self-hosted, `@livekit/components-react` |
| Backend | Next.js Route Handlers, `livekit-server-sdk` |
| Auth | `better-auth` + Prisma adapter |
| AI Agent | Python, `livekit-agents`, `livekit-plugins-deepgram` (STT), `livekit-plugins-openai` (LLM) |
| DB | PostgreSQL + Prisma 7 ORM + PgBouncer (connection pooling) |
| Cache/PubSub | Redis 7 (rate limiting, lobby pub/sub, chat real-time, caching) |
| Storage | MinIO (S3-compatible) |
| Proxy | Traefik v3 + Let's Encrypt (prod only) |

## Architecture

```
├── src/
│   ├── app/
│   │   ├── api/                    # 15 API route handlers
│   │   │   ├── auth/[...all]/      # better-auth catch-all
│   │   │   ├── rooms/              # CRUD, by-code lookup
│   │   │   ├── rooms/[roomId]/     # join, lobby, lobby/stream (SSE), chat, files, moderate, hand-raise, start, end
│   │   │   └── livekit/            # token generation, webhook receiver
│   │   ├── (dashboard)/            # Host/Admin pages
│   │   ├── join/[code]/            # Guest entry
│   │   ├── room/[code]/            # Video room (LiveKit)
│   │   ├── login/ & register/      # Auth pages
│   │   └── page.tsx                # Landing
│   ├── components/
│   │   ├── room/                   # ChatPanel, ModerationPanel (with self-ban protection)
│   │   └── lobby/                  # WaitingRoom, LobbyManager (scrollable)
│   ├── lib/                        # prisma, auth, auth-helpers, livekit, redis, rate-limit, lobby-pubsub, chat-pubsub
│   ├── middleware.ts               # Dev protection (DEV_ACCESS_KEY, ALLOWED_IPS)
│   └── types/
├── ai-agent/                       # Python LiveKit Agent
├── prisma/schema.prisma            # 9 models, 3 enums
├── docker-compose.yml              # Base: postgres, minio, redis, pgbouncer, ai-agent, app
├── docker-compose.override.yml     # Local dev: direct ports, no SSL
├── docker-compose.prod.yml         # Traefik + Let's Encrypt
└── Dockerfile                      # Multi-stage Next.js standalone build
```

### Key Data Flows

1. **Guest join (with lobby):**
   Guest → POST `/api/rooms/[id]/join` → LobbyEntry(PENDING) → SSE via Redis pub/sub → Host approves → LiveKit token → connect

2. **Real-time chat:**
   POST message → DB + Redis PUBLISH → SSE `/api/rooms/[id]/chat/stream` → instant delivery to all participants

3. **Real-time transcription:**
   Audio tracks → AI Agent (Deepgram STT) → DataChannel → Live captions

4. **Post-lecture (`room_finished` webhook):**
   Transcript → OpenAI GPT → LectureArtifact → `/lectures/[id]`

### User Roles

- **ADMIN** — global panel, all rooms monitoring
- **HOST** — room creation, moderation, security
- **GUEST** — join by link, no registration required

### Security Layers

- `sessionFingerprint` (required) for bans — IP is secondary only
- PIN hashed with bcrypt, rate-limited (5 attempts/min per IP)
- Chat/files auth: verified via ParticipantHistory
- SSE lobby: verified against existing LobbyEntry
- Token generation: only room owner can get LiveKit token
- `DEV_ACCESS_KEY` middleware: protects local dev from network access
- LiveKit webhook: signature verification via `WebhookReceiver`

## Performance Architecture

```
Clients → Traefik (LB) → Next.js (x2 replicas) → PgBouncer (pool 25, max 500) → PostgreSQL
                                                 → Redis (pub/sub, cache, rate limit)
                                                 → LiveKit (video/audio SFU)
```

- **Redis pub/sub** replaces DB polling for lobby SSE and chat — instant delivery (<10ms)
- **PgBouncer** multiplexes 500 client connections into 25 real PostgreSQL connections
- **Chat SSE** via Redis pub/sub + optimistic UI on client — messages appear before server confirms
- **Rate limiting** via Redis INCR+EXPIRE — works across multiple app replicas
- **Chat cache** in Redis (10s TTL) — reduces DB reads during active rooms
- **Prisma select** — only fetch needed columns, not full rows

## Commands

```bash
# Dev
npm run dev                           # Next.js dev server (localhost:3000)
npm run dev:https                     # Dev server with self-signed HTTPS (media devices on LAN)
docker compose up -d postgres minio redis pgbouncer  # DB + Storage + Redis + PgBouncer
npm run lint                          # TypeScript type-check (tsc --noEmit)

# Database
npx prisma migrate dev                # Create + apply migration
npx prisma db push                    # Quick schema sync (no migration)
npx prisma studio                     # DB GUI
npx prisma generate                   # Regenerate Prisma Client

# Build
npm run build -- --webpack            # Production build (Webpack, not Turbopack — WASM limitation on Windows)

# Docker (full stack)
docker compose up -d --build                                                  # Local
docker compose -f docker-compose.yml -f docker-compose.prod.yml up -d --build # Prod (with Traefik)

# AI Agent
cd ai-agent && python main.py start

# Setup script (universal installer/doctor)
./setup.sh                            # Interactive menu
./setup.sh dev                        # Kill old + pull + deps + containers + wait healthy + prisma + run
./setup.sh install                    # Full first-time setup (auto-generates passwords)
./setup.sh update                     # git pull + npm install + prisma + rebuild
./setup.sh doctor                     # Diagnose & auto-fix common issues
./setup.sh status                     # Health check all services
./setup.sh restart                    # Restart all containers
./setup.sh logs [service]             # Tail service logs (default: app)
./setup.sh admin                      # Promote user to ADMIN role
./setup.sh reset                      # Full teardown (with confirmation)
```

## Environment Variables

See `.env.example` for all variables. Key ones:

```env
DATABASE_URL=postgresql://postgres:postgres@localhost:5432/liveserver
LIVEKIT_URL=wss://...
LIVEKIT_API_KEY=...
LIVEKIT_API_SECRET=...
BETTER_AUTH_SECRET=...

# Auth — trusted origins for non-localhost access (comma-separated)
BETTER_AUTH_TRUSTED_ORIGINS=http://192.168.1.78:3000,http://localhost:3000
# LAN IP for auto trustedOrigins in dev (auto-detected by ./setup.sh dev)
# LAN_HOST=192.168.1.78

# Local dev protection (when DOMAIN is not set)
DEV_ACCESS_KEY=mySecretKey123
# ALLOWED_IPS=192.168.1.10,192.168.1.11

# Production
# DOMAIN=live.example.com
# ACME_EMAIL=admin@example.com
```

## Deployment Modes

| Mode | Command | Description |
|------|---------|-------------|
| **Local dev** | `docker compose up -d` | Direct ports (3000, 5432, 9000). `docker-compose.override.yml` auto-applied |
| **Production** | `docker compose -f docker-compose.yml -f docker-compose.prod.yml up -d` | Traefik reverse proxy, auto SSL via Let's Encrypt |

## Prisma 7 Notes

- `prisma.config.ts` in project root — `migrate.url()` provides DATABASE_URL for CLI commands (`prisma db push`, `prisma migrate`)
- **No `url` in schema datasource** — Prisma 7 forbids it, only `provider` allowed
- `PrismaClient` uses `@prisma/adapter-pg` (driver adapter) — `new PrismaClient({ adapter })` with `PrismaPg({ connectionString })`
- `new PrismaClient()` without adapter **will crash** in Prisma 7 (no datasourceUrl/datasources support)
- Use `-- --webpack` flag for `next build` on Windows (Turbopack WASM issue)

## Auth Notes

- `better-auth` handles registration/login via `/api/auth/[...all]` catch-all route
- **Client:** `auth-client.ts` uses `createAuthClient()` without `baseURL` — auto-detects current origin (works from any IP/domain)
- **Server:** `auth.ts` uses `BETTER_AUTH_URL` for `baseURL` and `BETTER_AUTH_TRUSTED_ORIGINS` (comma-separated) for CSRF origin validation. Without `BETTER_AUTH_TRUSTED_ORIGINS`, auto-detects all machine IPs via `os.networkInterfaces()` + localhost on ports 3000–3010, both `http://` and `https://` protocols
- First admin: first registered user automatically becomes ADMIN (via `databaseHooks.user.create.before` in `auth.ts`)
- **No `"type"` field in `package.json`** — removed to fix Turbopack ESM/CJS conflict in dev mode. Next.js handles ESM in `.ts/.tsx` automatically

## Agent Orchestration

| Task | Agent |
|------|-------|
| API routes, backend logic | `backend-architect` |
| React components, LiveKit UI | `frontend-developer` |
| DB schema, indexes, queries | `database-optimizer` |
| Python AI Agent, Deepgram/OpenAI | `ai-engineer` |
| System architecture | `software-architect` |
| UI design, components | `ui-designer` |
| UX flows, accessibility | `ux-architect` |
| Code review before commit | `code-reviewer` |

**Rule:** for tasks spanning 2+ layers — use `agents-orchestrator`.

## Post-Change Checklist (ОБЯЗАТЕЛЬНО)

После **каждого** изменения кода или конфигурации Claude **обязан** выполнить:

1. **Обновить `CLAUDE.md`** — если изменились архитектура, endpoints, модели, команды, стек или conventions
2. **Проверить `setup.sh`** — все новые сервисы/зависимости должны быть в скрипте (readiness checks, .env переменные, docker compose команды)
3. **Проверить `README.md`** — инструкции, API таблицы, структура проекта должны отражать текущее состояние
4. **Проверить `PROMPT.md`** — спецификация должна соответствовать реализации
5. **Проверить `.env.example`** — все новые переменные окружения должны быть задокументированы

Не пропускать этот чеклист. Если изменение не затрагивает файл — просто подтвердить что файл актуален.

## Known Issues & Fixes

| Issue | Cause | Fix |
|-------|-------|-----|
| White screen in dev (ESM/CJS conflict) | `"type": "module"` or `"type": "commonjs"` in package.json | Remove the `"type"` field entirely — Next.js doesn't need it |
| Auth silently fails from LAN | `auth-client.ts` had hardcoded `baseURL` → requests went to localhost from browser | Removed `baseURL`, added `trustedOrigins` config |
| `setup.sh doctor` crashes on .env check | Comments in `.env.example` parsed as variable names by `set -euo pipefail` | Fixed parsing logic |
| `setup.sh update` runs git pull after stash declined | Missing `else` branch after stash prompt | Fixed control flow |
| Auth form resets on non-localhost (no error shown) | `trustedOrigins` fallback only had `localhost:3000`, CSRF rejected other origins silently | `auth.ts` auto-allows ports 3000–3010 + `LAN_HOST`; `setup.sh dev` auto-detects LAN IP |
| Media devices blocked on LAN (not HTTPS) | Browsers require secure context for getUserMedia | `npm run dev:https` (Next.js `--experimental-https`), `setup.sh dev` auto-uses HTTPS |
| Chat messages duplicated | Race: SSE delivers msg before POST response, seenIds doesn't have real id yet | Check if SSE already delivered the message before replacing optimistic |
| Ban self crashes room | No server-side check for self-ban/kick | API rejects `targetSessionId === session.user.id`, UI hides buttons for self |

## UI Architecture

- **Design system:** CSS custom properties in `globals.css` via Tailwind v4 `@theme` — surface levels (0–3), accent (indigo), status colors, border tokens
- **Room layout (Google Meet style):**
  - Minimal top bar (room name + code)
  - Video area: `GridLayout` (cameras) or `FocusLayout` (screen share active — carousel + focused view)
  - Bottom control bar: mic, camera, screen share | chat, lobby, moderation, hand raise | leave/end
- **Screen share:** auto-detected via `useTracks(Track.Source.ScreenShare)`, switches to focus layout with `CarouselLayout` for camera feeds
- **Sidebar:** 320px right panel for chat, lobby manager, moderation — stacked, each with own scroll
- **Components use LiveKit hooks:** `useLocalParticipant`, `useParticipants`, `useRoomContext`, `useTracks`

## Conventions

- Communication language: Russian
- Guests don't register, but `user_id` reserved for future LMS
- `sessionId` (UUID) is the cross-cutting key linking LobbyEntry, ParticipantHistory, ChatMessage, SharedFile for guests
- `Room.code` is the user-facing invite code (not the DB id)
- Files store `fileKey` (S3 object key), not full URLs
- `LectureArtifact` is 1:1 with Room
- All cascade deletes: removing Room removes all related data
- MinIO stays as S3 storage — GitHub repo archived (Feb 2026) but Docker image still maintained, no viable lightweight alternative