# Architecture

> Last Updated: 2026-04-10T20:33:00.000Z

## Overview

| Attribute | Value |
|-----------|-------|
| Primary language | TypeScript |
| Secondary language | Java |
| Source counts | 17 TypeScript source files under `src/`, 3 Java files under `android/app/src/` |
| Project type | Phaser browser game packaged for Android with Capacitor |
| Framework | Phaser 3.87.0 |
| Tooling | Vite 5.x, TypeScript 5.x, Capacitor 8.3.x, tsx 4.19.x |
| Runtime layout | 1280 x 720, `Phaser.Scale.FIT`, centered in `#game` |
| Build command | `npm run build` |
| Verification command | `npx tsc --noEmit` |

The repository is a TypeScript-first implementation of Scopone Scientifico. Pure rules, scoring, imperfect-information tracking, AI heuristics, worker transport, and benchmark code live under `src/game/`. Phaser scenes under `src/scenes/` own rendering, input, pacing, menus, and procedural audio. The `android/` tree is a Capacitor wrapper with Gradle configuration and a custom `MainActivity` for immersive full-screen behavior.

## Project Structure

```text
scopone-phaser/
|- src/
|  |- main.ts
|  |- game/
|  |  |- ai-benchmark-fixtures.ts
|  |  |- ai-benchmark.ts
|  |  |- ai-worker-client.ts
|  |  |- ai-worker-protocol.ts
|  |  |- ai.ts
|  |  |- ai.worker.ts
|  |  |- card-tracker.ts
|  |  |- engine.ts
|  |  |- preferences.ts
|  |  `- types.ts
|  `- scenes/
|     |- BootScene.ts
|     |- GameScene.ts
|     |- MenuScene.ts
|     `- SettingsScene.ts
|- public/
|- android/
|  |- app/
|  |- build.gradle
|  `- variables.gradle
|- docs/
|- prompts/
|- package.json
|- tsconfig.json
|- vite.config.ts
`- capacitor.config.ts
```

## Key Directories

| Directory | Purpose |
|-----------|---------|
| `src/game/` | Rules engine, state transitions, score calculation, hidden-information tracking, audio preference persistence, AI heuristics, worker protocol, and benchmark harnesses |
| `src/scenes/` | Phaser scene lifecycle, menu flow, settings UI, board rendering, HUD, interaction, particles, and audio playback |
| `public/` | Card atlas metadata and other static assets loaded by Phaser |
| `android/` | Capacitor Android project, Gradle configuration, generated wrapper assets, and native activity code |
| `docs/` | Architecture, code style, findings, and cache metadata |
| `prompts/` | JIRA workflow artifacts and iteration state |

## Design Patterns

No explicit design patterns were detected by semantic search.

Observed architectural patterns:

| Pattern | Where it appears |
|---------|------------------|
| Scene-based flow | `BootScene -> MenuScene -> GameScene`, with `SettingsScene` opened from the menu and returning to it |
| Functional core / imperative shell | `src/game/` avoids Phaser imports while `src/scenes/` owns runtime side effects |
| Immutable state transitions | `applyMove()` clones `GameState` before applying turn mutations |
| Worker offload with fallback | `AIWorkerClient` uses `ai.worker.ts` when available and falls back to direct `chooseMove()` otherwise |
| Typed message protocol | `ai-worker-protocol.ts` defines worker request, progress, result, and serialized error shapes |
| Persistence adapter | `preferences.ts` normalizes and stores audio settings through a storage boundary |
| Deterministic benchmark harness | `ai-benchmark.ts` uses fixtures, seeded self-play, and simulated timing sources to evaluate AI quality |

## Key Components

### `src/main.ts`

- Creates the `Phaser.Game` instance.
- Installs a one-shot fullscreen request on first user input when supported.
- Registers `BootScene`, `MenuScene`, `GameScene`, and `SettingsScene` directly in the Phaser game config.

### `src/game/types.ts`

- Defines the core game model: `Card`, `Capture`, `Player`, `GameState`, `TeamScore`, and `ScoreBreakdown`.
- Models constrained domains with unions such as `PlayerIndex`, `Difficulty`, and `DealerRelativeRole`.
- Stores `PRIMIERA_VALUES` for primiera scoring.

### `src/game/engine.ts`

- Builds and shuffles the 40-card deck.
- Creates a four-player round state with dealer-relative opening order and stable player labels.
- Implements Scopone capture rules where direct value matches take priority over subset-sum captures.
- Applies moves immutably, awards scopa only before the final play, assigns leftover table cards to the last capturing team, and computes round scoring.

### `src/game/card-tracker.ts`

- Tracks cards visible through play and capture events without exposing hidden hands.
- Reconstructs unseen cards from visible information.
- Supplies suit counts, same-rank residue summaries, and probability signals used by higher AI tiers.

### `src/game/preferences.ts`

- Defines the persisted audio preference model.
- Normalizes invalid storage payloads back to safe defaults.
- Loads and saves preferences through `localStorage` when available, with browser-safe fallbacks.

### `src/game/ai.ts`

- Exposes `chooseMove()` as the async AI entry point.
- Implements three difficulty tiers: `beginner`, `advanced`, and `master`.
- Uses tracker-based inference, tactical scoring, determinization sampling, and alpha-beta search.
- Applies dynamic master search profiles, with a base profile of `4300 ms / 8 samples / depth 5 / batch 2` and tighter endgame branches down to `3200 ms / 4 samples / exact remaining depth / batch 1`.

### `src/game/ai-worker-protocol.ts`

- Defines a single `choose-move` worker request type.
- Defines typed progress, result, and serialized error responses.
- Keeps worker communication schema isolated from scene code.

### `src/game/ai-worker-client.ts`

- Wraps worker lifecycle and pending-request tracking behind the same `chooseMove()` API scenes consume.
- Creates the worker as an ES module with `new Worker(new URL('./ai.worker.ts', import.meta.url), { type: 'module' })`.
- Fails over pending requests to in-thread AI execution if worker creation, posting, or deserialization fails.

### `src/game/ai.worker.ts`

- Rehydrates `CardTracker` from a serialized snapshot.
- Delegates move selection to `chooseMove()`.
- Posts progress, result, or serialized error messages back to the main thread.

### `src/game/ai-benchmark.ts` and `src/game/ai-benchmark-fixtures.ts`

- Define the AI quality harness exposed as `npm run benchmark:ai-quality`.
- Combine fixed fixtures, critical-concept checks, seeded self-play, and simulated timing sources.
- Enforce the current iteration 5 contract: 13 fixed fixtures, 6 critical concepts, and 48 self-play matches.

### `src/scenes/BootScene.ts`

- Loads the card atlas and card back.
- Displays a loading bar.
- Transitions into `MenuScene` after asset load.

### `src/scenes/MenuScene.ts`

- Renders the title, rules summary, difficulty selection, and audio-settings entry point.
- Reads persisted audio preferences before match start.
- Computes separate desktop and compact-viewport layouts for responsive menu composition.

### `src/scenes/SettingsScene.ts`

- Provides a dedicated audio settings surface.
- Toggles music and effects independently.
- Saves each change immediately and returns control to the menu scene.

### `src/scenes/GameScene.ts`

- Owns match flow, dealing, selection, capture resolution, AI orchestration, score HUD, status UI, think bar, particles, and procedural audio.
- Instantiates and disposes `AIWorkerClient` on scene lifecycle events.
- Enforces `AI_MIN_THINK_MS = 1000` and `MOVE_OUTCOME_STATUS_MS = 2000` through timer-backed scene logic.
- Reads normalized audio preferences from scene data or persisted storage.
- Updates `CardTracker` after play and capture events so AI inference remains derived from visible information.

### `android/app/src/main/java/com/phaser/scopa/MainActivity.java`

- Extends `BridgeActivity`.
- Applies immersive mode during `onCreate()` and when window focus returns.
- Hides status and navigation bars with transient swipe behavior.

## Dependencies

### JavaScript production dependencies

| Package | Version | Purpose |
|---------|---------|---------|
| `phaser` | `^3.87.0` | Game engine runtime |
| `@capacitor/core` | `^8.3.0` | Capacitor runtime bridge |
| `@capacitor/cli` | `^8.3.0` | Capacitor project tooling |
| `@capacitor/android` | `^8.3.0` | Android platform integration |

### JavaScript development dependencies

| Package | Version | Purpose |
|---------|---------|---------|
| `tsx` | `^4.19.2` | TypeScript execution for benchmark and prompt-local tooling |
| `typescript` | `^5.0.0` | Static type checking and TS compilation step |
| `vite` | `^5.0.0` | Dev server and production bundler |

### Android / Gradle dependencies

| Dependency | Version | Source | Purpose |
|------------|---------|--------|---------|
| `com.android.tools.build:gradle` | `8.13.0` | `android/build.gradle` | Android Gradle plugin |
| `com.google.gms:google-services` | `4.4.4` | `android/build.gradle` | Optional Google services integration |
| `androidx.appcompat:appcompat` | `1.7.1` | `android/variables.gradle` | Android app compatibility |
| `androidx.coordinatorlayout:coordinatorlayout` | `1.3.0` | `android/variables.gradle` | Layout coordination helpers |
| `androidx.core:core-splashscreen` | `1.2.0` | `android/variables.gradle` | Splash screen support |
| `junit:junit` | `4.13.2` | `android/variables.gradle` | JVM Android tests |
| `androidx.test.ext:junit` | `1.3.0` | `android/variables.gradle` | Instrumented test runner |
| `androidx.test.espresso:espresso-core` | `3.7.0` | `android/variables.gradle` | Instrumented UI testing |

### Platform configuration

- `compileSdkVersion`: 36
- `targetSdkVersion`: 36
- `minSdkVersion`: 24

## Module Organization

```text
main.ts
  -> BootScene
  -> MenuScene
       -> SettingsScene
       -> GameScene
            -> engine.ts
            -> types.ts
            -> preferences.ts
            -> card-tracker.ts
            -> ai-worker-client.ts
                 -> ai-worker-protocol.ts
                 -> ai.worker.ts
                      -> ai.ts
ai-benchmark.ts
  -> ai.ts
  -> ai-benchmark-fixtures.ts
  -> engine.ts
  -> card-tracker.ts
```

Application-level dependency direction is one-way:

- `src/game/` imports only from sibling game modules.
- `src/scenes/` imports from `src/game/` and Phaser.
- `src/game/` never imports Phaser.

## Data Flow

1. `main.ts` creates the Phaser app, installs fullscreen-on-first-input, and registers the scene list.
2. `BootScene` loads atlas assets and starts `MenuScene`.
3. `MenuScene` reads persisted audio preferences, lets the player choose difficulty, and can open `SettingsScene` for audio toggles.
4. `SettingsScene` writes audio preferences immediately and returns to `MenuScene`.
5. `GameScene.create()` normalizes incoming scene data, creates a fresh `CardTracker`, creates a new `GameState`, and starts the opening deal.
6. Human turns use pointer-driven card selection and `findCaptures()` output to choose legal captures.
7. AI turns call `AIWorkerClient.chooseMove(state, playerIdx, difficulty, tracker, onProgress)`.
8. `AIWorkerClient` posts a typed request to `ai.worker.ts`; if workers are unavailable, it reruns the same request in-thread.
9. `chooseMove()` returns a heuristic move for lower tiers or performs batched master search while emitting `AIDecisionProgress`.
10. `GameScene` updates the think bar from progress callbacks, enforces a minimum visible think time, executes the returned move, records tracker state, and advances turn order.
11. When every hand is empty, `engine.ts` finalizes scoring and `GameScene` presents the round or match outcome.
12. Separately, `ai-benchmark.ts` exercises the same game and AI modules through fixed fixtures, seeded self-play, and simulated timing to produce quality summaries.

## Build System

| Command | Source | Purpose |
|---------|--------|---------|
| `npm run dev` | `package.json` | Starts the Vite dev server |
| `npm run build` | `package.json` | Runs `tsc && vite build` and writes web output to `dist/` |
| `npm run preview` | `package.json` | Serves the built app with Vite preview |
| `npm run benchmark:ai-quality` | `package.json` | Runs the AI benchmark harness through `tsx` |
| `npx tsc --noEmit` | inferred TypeScript verification | Type-checks the codebase without emitting build artifacts |

No top-level `tests/` directory was discovered in the repository.