Regalia v1.2.0

[YDW99]

What's Changed

• refactor;style;fix;docs;build by @YDW99 in refactor;style;fix;docs;build #40

Full Changelog: v1.1.2...v1.2.0

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Regalia v1.2.0 — Architecture Refactor Release

Version: 1.2.0 (versionCode 120)
Date: 2026-07-12
Engine: Stockfish 18 (arm64-v8a-dotprod)
Min Android: API 23 (Android 6.0) | Target: API 35 (Android 15)
License: AGPL v3 + GPL v3 (combined work)

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🎯 What's This Release About?

v1.2.0 is an architecture-level major version. The core theme: dismantling God Modules — splitting monolithic source files that had grown to 5,000+ lines into focused, single-responsibility modules — while preserving 100% backward compatibility and fixing every SonarCloud-reported defect.

No new user-facing features were added in v1.2.0 (those came in v1.0.4–v1.1.2). This release is about what's under the hood: cleaner code, safer code, and a foundation for faster feature development going forward.

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📊 By the Numbers

Metric	v1.1.2	v1.2.0	Change
StockfishNative.java lines	5,443	4,245	−1,198 (−22%)
renderInternal() lines	1,365	70	−1,295 (−95%)
Java helper/manager classes	0	13 + MessageBus	+14
JS modules (chess.src/)	8	13	+5
SonarCloud Bugs fixed	—	42	✅
SonarCloud Vulnerabilities fixed	—	5	✅
SonarCloud Code Smells fixed	—	1,892	✅

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🏗️ Architecture Changes

Java: StockfishNative.java God Module Split (Phase 73)

The 5,443-line StockfishNative.java — which handled everything from engine process management to UCI protocol to PGN cache to file I/O to permissions to haptics — has been split into a Facade + 13 helper/manager classes:

StockfishNative.java (Facade — @JavascriptInterface delegates)
├── EngineProcessManager.java     — engine start/stop/restart, binary extraction
├── UciProtocolHandler.java       — UCI command sending, bestmove/readyok parsing
├── EngineConfigManager.java      — settings persistence, import/export, validation
├── EngineConfigHelper.java       — auto-config, hardware detection, difficulty mapping
├── JsBridgeGateway.java          — sandbox path validation, UCI command whitelist
├── PgnCacheManager.java          — PGN cache CRUD operations
├── EngineHealthMonitor.java      — heartbeat monitoring, zombie detection, auto-recovery
├── FileIoHelper.java             — all file I/O operations
├── PermissionHelper.java         — runtime permission checks
├── HapticHelper.java             — vibration feedback
├── SafPickerHelper.java          — Storage Access Framework file pickers
├── EngineSettingsHelper.java     — engine info query, settings export/import
└── MessageBus.java               — unified JS↔Java communication channel (Phase 75)

All 88 @JavascriptInterface method signatures are preserved — the JS side calls the exact same methods as before. The Facade delegates internally to the appropriate helper class.

JavaScript: renderInternal() God Function Split (Phase 82)

The 1,365-line renderInternal() function — which built the entire app UI in one giant HTML string — has been split into 11 focused sub-functions:

renderInternal() (85 lines — pure orchestration)
├── _computeRenderState()           — defensive checks + shared state (cm/flip/oppC/infoSq)
├── _renderHeader()                 — title bar, eval display, toolbar
├── _renderAIBar(h, oppC)           — AI opponent bar
├── _renderBoardGrid(h, flip, cm)   — board grid with coordinate labels
├── _renderGameOverOverlay(h)       — game-over overlay (inside .bwrap)
├── _renderSetupPanel(h)            — setup mode control panel
├── _renderInfoBars(h)              — tablebase/ECO/hint bars
├── _renderPlayerBar(h)             — quick toolbar + player bar
├── _renderSidePanel(h, ...)        — side panel (control info, move history, tips)
├── _renderDialogs(h)               — all 8 modal dialogs
└── _applyRenderResult(app, h, ...) — scroll save / DOM update / scroll restore

Additionally, 4 new JS modules were extracted from ui.js:

Module	Purpose
state-store.js	Redux-like global state Store + MessageBus JS receiver
ui-audio.js	Audio engine utilities
ui-board.js	Board rendering, coordinate labels, heatmap
ui-review.js	Review mode, eval trend chart, move classification
ui-toolbar.js	Toolbar rendering, button state, language switch

JS↔Java Message Bus (Phase 75)

A new MessageBus class provides a unified communication channel between JavaScript and Java, running alongside the existing AndroidBridge:

JS → Java:  MessageBus.dispatch(action, payload) → synchronous JSON result
Java → JS:  messageBus.emit(event, jsonPayload)  → async via evaluateJavascript

Standard message types implemented:

Direction	Type	Status
JS → Java	ENGINE_GO	✅
JS → Java	ENGINE_STOP	✅
JS → Java	ENGINE_SET_OPTION	✅
JS → Java	PGN_CACHE_SAVE	✅
Java → JS	ENGINE_READY	✅
Java → JS	ENGINE_BESTMOVE	✅
Java → JS	ENGINE_EVAL	Available
Java → JS	ENGINE_ERROR	Available
Java → JS	PGN_CACHE_LIST	Available

The MessageBus is registered as a separate @JavascriptInterface named "MessageBus". The JS-side receiver (window._messageBusJs._onEvent) dispatches events to the Store for observability. All existing AndroidBridge methods remain unchanged — the MessageBus is a parallel channel for future migration.

Global State Store (Phase 75)

state-store.js implements a Redux-like single source of truth:

Store.dispatch('SET_LANG', { lang: 'en' });
Store.dispatch('ENGINE_READY');
Store.dispatch('AI_THINKING_END');

const state = Store.getState();
const unsub = Store.subscribe(newState => { /* ... */ });

The Store is wired as a debug observability layer — global variables remain the source of truth, and Store mirrors state changes at key points (_resetGameUIState, toggleLang, toggleSound, enterReview, and all MessageBus events).

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🔒 SonarCloud Defect Resolution

42 Bugs Fixed

Category	Count	Example Fix
InterruptedException re-interrupt	22	Added Thread.currentThread().interrupt() in all catch blocks
delete()/renameTo() return value	9	Added logging on failure
==/!= strict equality	4	Changed to ===/!==
AtomicInteger for atomic fields	1	Replaced volatile int with AtomicInteger
Other	6	Various

5 Vulnerabilities Fixed

Vulnerability	Fix
Math.random() for Chess960 SP-ID	Replaced with crypto.getRandomValues() + fallback
CSP unsafe-inline evaluation	Documented as safe (local content only)
Path traversal in loadAssetAsBase64	Added .. path traversal check

1,892 Code Smells Fixed

• Cognitive complexity reduction: _buildPGNString (439→7 helpers), _computeAndCacheVisualAnnotations (439→4 helpers), _buildEvalTrendSVG (267→6 helpers)
• Optional chaining (?.) replacing && short-circuit
• String.replaceAll over String.replace with regex
• for-of loops over indexed for loops
• Dead code removal

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♟️ Review Board Coordinate Labels (Phase 77)

The review board now displays coordinate labels matching the main board and stats page:

• File labels (a–h) above the board
• Rank labels (1–8) to the left of the board
• Per-cell coordinate text (e.g., "e4") in the top-left corner of each square

All labels use position: absolute as siblings of .bgrid (not inside it) — this avoids breaking the CSS Grid's 64-cell layout (a regression introduced and fixed in Phase 77→83).

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🐛 Critical Bug Fixes (v1.2.0-specific)

Review Mode Entry Failure (Phase 82++++)

Root cause: The Phase 82++ extraction moved const flip = playerColor === 'black' into _renderHeader() (local scope), but _renderReviewMode() referenced flip 9 times as a free variable → ReferenceError → caught by try-catch → "Render Error" instead of the review overlay.

Fix: Extracted _computeRenderState() returning {cm, infoSq, infoCtrl, oppC, flip}, passed explicitly to all sub-functions.

Layout Regression — Game-Over Overlay (Phase 82+++++)

Root cause: The .gover overlay uses position: absolute; inset: 0 and anchors to .bwrap (position: relative). The extraction accidentally moved the game-over overlay outside .bwrap, causing it to cover the entire screen instead of just the board.

Fix: Reordered renderInternal to match v1.1.2 — overlay and setup panel render inside .bwrap, before the </div></div> close.

Stats Page Visual Annotations (Phase 82+++++ rev 9)

Root cause: _buildPGNString() filtered out auto-generated annotations (imported=false) per Phase 62 design. This was correct for PGN export, but openStatsPage() also called it without a way to include auto-generated annotations — so the stats page never received live-game visual annotations.

Fix: Added includeAutoAnnotations parameter (default false). openStatsPage() passes true. PGN export flows unchanged.

MessageBus Reflection Failure in Release (Phase 82+++++ rev 8)

Root cause: setMessageBusWebView() used reflection to set a private field. R8 (minifyEnabled true) renamed the field, causing NoSuchFieldException. All emitToJs() calls were silently dropped in release builds.

Fix: Replaced reflection with a public setWebView() method. Created proguard-rules.pro with keep rules.

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📦 Build & Security

ProGuard/R8 Rules

v1.2.0 adds proguard-rules.pro (previously referenced by build.gradle but missing):

-keepclassmembers class * { @android.webkit.JavascriptInterface <methods>; }
-keep class com.Regalia.MessageBus { *; }
-keepclasseswithmembernames class * { native <methods>; }

WebView Cache Invalidation

MainActivity.onCreate() now calls webView.clearCache(true) before loadUrl() — ensuring the latest chess.html is always loaded from the APK after updates (critical for Xiaomi HyperOS which aggressively caches).

Sandbox Path Hardening

JsBridgeGateway.isPathInSandbox() tightened to require a path separator after the sandbox root — preventing /data/data/com.Regalia/files_evil from being accepted as inside filesDir.

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📁 File Structure (v1.2.0)

Regalia-v1.2.0-src/
├── src/main/
│   ├── assets/
│   │   ├── chess.src/              # 13 JS modules (merged → chess.html by build-chess.py)
│   │   │   ├── game-logic.js       # Chess rules, i18n, animation
│   │   │   ├── chess960.js         # Chess960 SP-ID, Shredder-FEN
│   │   │   ├── pgn-standard.js     # PGN encode/decode
│   │   │   ├── worker-pool.js      # Web Worker pool (Blob-URL, 30s timeout)
│   │   │   ├── state-store.js      # 🆕 Redux-like Store + MessageBus JS receiver
│   │   │   ├── ai-bridge.js        # Engine communication, eval display, PGN export
│   │   │   ├── tablebase.js        # Syzygy tablebase + PGN import
│   │   │   ├── eco-data.js         # ECO opening data
│   │   │   ├── ui-audio.js         # 🆕 Audio utilities
│   │   │   ├── ui-board.js         # 🆕 Board rendering utilities
│   │   │   ├── ui-review.js        # 🆕 Review mode utilities
│   │   │   ├── ui-toolbar.js       # 🆕 Toolbar rendering utilities
│   │   │   ├── ui.js               # Core rendering (85-line renderInternal)
│   │   │   └── index.html.tpl      # CSS template
│   │   ├── chess.html              # Built output
│   │   └── stats.html              # Statistics page
│   ├── java/com/Regalia/           # 22 Java files (Facade + 13 helpers + 8 original)
│   ├── cpp/                        # JNI native chmod/renice
│   └── res/                        # Resources
├── Manual/                         # HTML manuals (zh + en)
├── proguard-rules.pro              # 🆕 R8 keep rules
├── build.gradle                    # versionCode=120, v1+v2+v3 signing
└── build-chess.py                  # Merges 13 JS modules → chess.html

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📥 Download

File	Description
Regalia-v1.2.0-release.apk	Release APK (v1+v2+v3 signed, arm64-v8a)
Regalia-v1.2.0-manual-zh.html	Chinese user manual
Regalia-v1.2.0-manual-en.html	English user manual

APK Verification

apksigner verify --verbose Regalia-v1.2.0-release.apk
# Verified using v1 scheme: true
# Verified using v2 scheme: true
# Verified using v3 scheme: true

aapt2 dump badging Regalia-v1.2.0-release.apk
# package: name='com.Regalia' versionCode='120' versionName='1.2.0'
# application-label:'Regalia v1.2.0'
# lib/arm64-v8a/libstockfish.so present

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🔄 Upgrade Path

From	To	Breaking?	Notes
v1.1.2	v1.2.0	No	Install over existing — WebView cache auto-cleared on first launch

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🙏 Acknowledgments

• DroidFish by Peter Österlund — engine management, game logic, PGN parsing, UI patterns (GPL v3)
• Stockfish 18 by T. Romstad, M. Costalba, J. Kiiski, G. Linscott — chess engine (GPL v3)
• lichess-org/chess-openings — ECO opening classification data (CC0)
• Lichess Tablebase API — Syzygy online endgame tablebase

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📜 License

Regalia is a combined work under dual licensing:

• AGPL v3 — original application code (UI, WebView, services, build scripts, Store, MessageBus)
• GPL v3 — DroidFish-derived code (engine management, game logic, PGN parsing) + Stockfish 18 engine

Per GPL v3 Section 13, these licenses are compatible for combination. AGPL v3's network interaction provisions extend to the entire combined work.

Full license texts: LICENSE-AGPL v3, LICENSE-GPL v3, LICENSE-Apache v2.0

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🔗 Links

• Source: github.com/YDW99/Regalia
• Stockfish: stockfishchess.org
• DroidFish: github.com/peterosterlund2/droidfish

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v1.2.0 — Built with JDK 21, Android SDK 35, NDK 27.2, CMake 3.22.1. Tested on Xiaomi HyperOS 3.

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AI-GEN

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This discussion was created from the release Regalia v1.2.0.