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tiennm99 de6bdf7eec docs: lock scope to lô tô hội chợ tân tân variant

- pdr: explicit in-scope (9x9, 5/row + 5/col, ascending cols, single-row
  Kinh, "Chờ N", continue-after-win) vs out-of-scope (3x9 european
  bingo 90, two-line / full-house tiers, custom number ranges)
- update codebase-summary, system-architecture, development-roadmap to
  reflect 11x9 master board, draw-order overlay, exact 5/col picker
- add researcher report comparing tân tân vs european bingo 90

2026-04-26 23:40:07 +07:00

4.2 KiB

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Development Roadmap

This document tracks future work only. Completed features live in git commit history, not here.

Currently Implemented Features

The app is fully functional for core gameplay (Lô tô hội chợ Tân Tân variant):

9×9 player card with exactly 5 per row and 5 per column, columns ascending top-to-bottom
Cell marking (toggle crossed state); player can keep playing after Kinh
Bingo detection and "Kinh!" celebration popup
"Chờ X" waiting notifications
Host number drawing from 1–90 deck
11×9 last-digit-aligned master board with draw-order overlay for fast Kinh verification
Host's own player card (isolated instance)
localStorage persistence
Dark mode
Mobile responsive
Offline capable

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)

Theme Switcher

Explicit light/dark toggle button instead of relying on OS preference. Status: Idea (Tailwind already supports OS toggle)

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 (Planned but Unstarted)

Unit Tests

Game logic: generateGrid(), isRowComplete(), getWaitingNumber()
localStorage helpers: saveGrid(), loadGrid(), etc.

Tech: Vitest (Vite's native test runner)

Component Tests

PlayerBoard with mocked localStorage, $state/$derived verification
Master page 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., 1–75 for American bingo) instead of hardcoded 1–90. 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
No testing → small codebase (<300 LOC), manual testing covers critical paths; add when code grows
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: 2026-04-26

4.2 KiB Raw Blame History Unescape Escape