Vocabulary Trainer — Roadmap

Each phase produces a working, deployable increment. Nothing is built speculatively.

Phase 0 — Foundation

Goal: Empty repo that builds, lints, and runs end-to-end.
Done when: pnpm dev starts both apps; GET /api/health returns 200; React renders a hello page.

Initialise pnpm workspace monorepo: apps/web, apps/api, packages/shared, packages/db
Configure TypeScript project references across packages
Set up ESLint + Prettier with shared configs in root
Set up Vitest in api and web
Scaffold Express app with GET /api/health
Scaffold Vite + React app with TanStack Router (single root route)
Configure Drizzle ORM + connection to local PostgreSQL
Write first migration (empty — just validates the pipeline works)
docker-compose.yml for local dev: api, web, postgres, valkey
.env.example files for apps/api and apps/web
testing ts config inheritance with tsx --showConfig

Phase 1 — Vocabulary Data

Goal: Word data lives in the DB and can be queried via the API.
Done when: GET /api/terms?pair=en-it&limit=10 returns 10 terms, each with 3 distractors attached.

Run scripts/extract_omw.py locally → generates packages/db/src/seed.json
Write Drizzle schema: terms, translations, language_pairs
Write and run migration
Write packages/db/src/seed.ts (reads seed.json, populates tables)
Implement TermRepository.getRandom(pairId, limit)
Implement QuizService.attachDistractors(terms) — same POS, server-side, no duplicates
Implement GET /language-pairs and GET /terms endpoints
Define Zod response schemas in packages/shared
Unit tests for QuizService (correct POS filtering, never includes the answer)

Phase 2 — Auth

Goal: Users can log in via Google or GitHub and stay logged in.
Done when: JWT from OpenAuth is validated by the API; protected routes redirect unauthenticated users; user row is created on first login.

Add OpenAuth service to docker-compose.yml
Write Drizzle schema: users
Write and run migration
Implement JWT validation middleware in apps/api
Implement GET /api/auth/me (validate token, upsert user row, return user)
Define auth Zod schemas in packages/shared
Frontend: login page with "Continue with Google" + "Continue with GitHub" buttons
Frontend: redirect to auth.yourdomain.com → receive JWT → store in memory + HttpOnly cookie
Frontend: TanStack Router auth guard (redirects unauthenticated users)
Frontend: TanStack Query api.ts attaches token to every request
Unit tests for JWT middleware

Phase 3 — Single-player Mode

Goal: A logged-in user can complete a full solo quiz session.
Done when: User sees 10 questions, picks answers, sees their final score.

Frontend: /singleplayer route
useQuizSession hook: fetch terms, manage question index + score state
QuestionCard component: prompt word + 4 answer buttons
OptionButton component: idle / correct / wrong states
ScoreScreen component: final score + play-again button
TanStack Query integration for GET /terms
RTL tests for QuestionCard and OptionButton

Phase 4 — Multiplayer Rooms (Lobby)

Goal: Players can create and join rooms; the host sees all joined players in real time.
Done when: Two browser tabs can join the same room and see each other's display names update live via WebSocket.

Write Drizzle schema: rooms, room_players
Write and run migration
POST /rooms and POST /rooms/:code/join REST endpoints
RoomService: create room with short code, join room, enforce max player limit
WebSocket server: attach ws upgrade handler to the Express HTTP server
WS auth middleware: validate OpenAuth JWT on upgrade
WS message router: dispatch incoming messages by type
room:join / room:leave handlers → broadcast room:state to all room members
Room membership tracked in Valkey (ephemeral) + room_players in PostgreSQL (durable)
Define all WS event Zod schemas in packages/shared
Frontend: /multiplayer/lobby — create room form + join-by-code form
Frontend: /multiplayer/room/:code — player list, room code display, "Start Game" (host only)
Frontend: ws.ts singleton WS client with reconnect on drop
Frontend: Zustand gameStore handles incoming room:state events

Phase 5 — Multiplayer Game

Goal: Host starts a game; all players answer simultaneously in real time; a winner is declared.
Done when: 2–4 players complete a 10-round game with correct live scores and a winner screen.

GameService: generate question sequence for a room, enforce server-side 15 s timer
room:start WS handler → begin question loop, broadcast first game:question
game:answer WS handler → collect per-player answers
On all-answered or timeout → evaluate, broadcast game:answer_result
After N rounds → broadcast game:finished, update rooms.status + room_players.score in DB
Frontend: /multiplayer/game/:code route
Frontend: extend Zustand store with currentQuestion, roundAnswers, scores
Frontend: reuse QuestionCard + OptionButton; add countdown timer ring
Frontend: ScoreBoard component — live per-player scores after each round
Frontend: GameFinished screen — winner highlight, final scores, "Play Again" button
Unit tests for GameService (round evaluation, tie-breaking, timeout auto-advance)

Phase 6 — Production Deployment

Goal: App is live on Hetzner, accessible via HTTPS on all subdomains.
Done when: https://app.yourdomain.com loads; wss://api.yourdomain.com connects; auth flow works end-to-end.

docker-compose.prod.yml: all services + nginx-proxy + acme-companion
Nginx config per container: VIRTUAL_HOST + LETSENCRYPT_HOST env vars
Production .env files on VPS (OpenAuth secrets, DB credentials, Valkey URL)
Drizzle migration runs on api container start
Seed production DB (run seed.ts once)
Smoke test: login → solo game → create room → multiplayer game end-to-end

Phase 7 — Polish & Hardening (post-MVP)

Not required to ship, but address before real users arrive.

Rate limiting on API endpoints (express-rate-limit)
Graceful WS reconnect with exponential back-off
React error boundaries
GET /users/me/stats endpoint + profile page
Accessibility pass (keyboard nav, ARIA on quiz buttons)
Favicon, page titles, Open Graph meta
CI/CD pipeline (GitHub Actions → SSH deploy on push to main)
Database backups (cron → Hetzner Object Storage)

Dependency Graph

Phase 0 (Foundation)
  └── Phase 1 (Vocabulary Data)
        └── Phase 2 (Auth)
              ├── Phase 3 (Singleplayer)   ← parallel with Phase 4
              └── Phase 4 (Room Lobby)
                    └── Phase 5 (Multiplayer Game)
                          └── Phase 6 (Deployment)

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