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loto/web/docs/development-roadmap.md
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tiennm99 e2c116abe2 chore: sync docs with single-page app, fix jsconfig
- docs: drop stale /master route refs (system-architecture page flow,
  client-only file list, basePath profiles; pdr architecture section
  + acceptance items; codebase-summary mounted-on notes; code-standards
  link example; deployment-guide redirect explanation)
- roadmap: drop "Currently Implemented Features" section (lives in git
  log + plans + pdr/codebase-summary)
- jsconfig: extend .svelte-kit/tsconfig.json (clears SvelteKit warning,
  picks up generated paths/aliases)
2026-04-27 07:44:19 +07:00

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# Development Roadmap
This document tracks **future work only**. Completed features live in
git commit history and `plans/`, not here. For "what's in the app right
now", see `docs/project-overview-pdr.md` and `docs/codebase-summary.md`.
## Idea Phase
### Sound Effects on Bingo
Play celebratory chime or "Kinh!" voice snippet when row completes. Could use Web Audio API or `<audio>` tag. **Status**: Idea (no demand yet)
### Undo Last Cell
Allow player to undo the most recent cross/uncross action. Requires change history or state snapshot. **Status**: Idea (low priority)
### PWA Install
Add service worker and manifest for "Install App" prompt on Android/iOS. **Status**: Idea (would require server-side components)
## Considered Phase
### Multiplayer Sync (Real-time)
Host and players connect via WebSocket to sync called numbers and state. Requires backend server. Would enable:
- Decoupled devices (players' phones, host's laptop on big screen)
- Remote tournaments
- Master board auto-updates all players in real-time
**Consideration**: Out of scope for static export. Requires major refactor (SvelteKit API routes + WebSocket server). Deferred indefinitely.
### i18n Beyond Vietnamese
Internationalization (English, Chinese, etc.). Requires extraction of all Vietnamese strings and i18n library (next-intl). **Status**: Considered (low demand for non-Vietnamese users)
### Undo/Redo System
Full undo/redo stack with history navigation. Adds complexity to state management. **Status**: Considered (YAGNI for now)
## Testing
### Component Tests (Planned)
- PlayerBoard with mocked localStorage, $state/$derived verification
- MasterPanel with different game states
### E2E Tests
- Player flow: generate card → click cells → verify bingo popup
- Host flow: new game → draw numbers → verify board state
**Tech**: Playwright
## Future Enhancements (Speculative)
### Export/Import Card
Allow player to export their grid as image or JSON, import someone else's card. Use Canvas API or print-friendly CSS.
### Leaderboard / Stats
Track games won, time per bingo, etc. Requires server-side persistence. Out of scope for static export.
### Accessibility Improvements
- ARIA labels for grid cells
- Keyboard navigation (arrow keys to move, Enter to toggle)
- Screen reader support
### Custom Number Range
Host selects range (e.g., 175 for American bingo) instead of hardcoded 190. Requires config UI and refactor of game logic constants. **Out of scope** per Lô tô hội chợ Tân Tân focus.
### Different Grid Sizes
Support 8×8 or 10×10 grids, or 3×9 European Bingo 90 tickets. **Out of scope** — variant locked to 9×9 Tân Tân format.
### Two-line / Full-house Win Tiers
European Bingo 90 patterns. **Out of scope** — Tân Tân uses single-line "Kinh!" only.
---
## Decision Rationale
All decisions follow **YAGNI** (You Aren't Gonna Need It), **KISS** (Keep It Simple), **DRY** (Don't Repeat Yourself):
- No multiplayer sync → adds server dependency, breaks static export (Cloudflare Pages)
- No i18n → Vietnamese-only community, localizing adds complexity
- Unit tests implemented → critical paths (constraints, persistence, settings) now have automated coverage
- Component/E2E tests deferred → small codebase, manual testing sufficient for UI flows
- No undo/redo → simple game, mistakes are play experience
- Svelte 5 runes → cleaner reactivity than hooks, smaller mental model
Future work gates on **real user demand**, not speculation.
Last reviewed: 2026-04-27
Last synced: 2026-04-27 (6-phase refactor)