vim-maze/UNIFIED_API.md

Unified API Documentation

Complete reference for the vim-maze game engine architecture. This document describes the current implementation in src/ and serves as a blueprint for porting games and creating new games.

Table of Contents

1. Architecture Overview
2. File Structure
3. Type System
4. Core Hooks
5. Supporting Hooks
6. Implementation Examples
7. Integration Points

---

Architecture Overview

The vim-maze engine follows a composable hook architecture with a single entry point: useGame(options?, platformHook?).

Design Principles

• Single Entry Point: All games use useGame() to initialize
• Composable Hooks: Three core hooks compose to create the complete system
• Type-Safe: Full TypeScript support throughout
• Platform Agnostic: Works across any platform without modification
• Platform Optional: Optional platform hook for analytics and custom bindings

Core Composition

// Inside useGame:
const boardManager = useBoard(cols, rows);
const { cursor, keyManager } = useCursor(boardManager, gameStatusManager);
const scoreManager = useScore({ board, hero, gameStatusManager, keyManager });
const heroRenderer = useHeroRender({ gameStatus, board, hero });

// Returns unified GameManager interface
return {
  containerRef,
  renderBoard,
  cursor,
  hero,
  renderer,
  scoreManager,
  gameStatus,
  startGame,
  togglePause,
  quitGame,
  keyLog,
  ...
};

---

File Structure

src/
├── index.ts                    # Main package exports
├── types.ts                    # All shared TypeScript types
├── useGame.ts                  # Main orchestrator hook
├── useGameStatus/
│   └── useGameStatus.ts        # Game state management
├── useBoard/
│   ├── index.ts                # Public exports
│   ├── useBoard.ts             # Board/maze management hook
│   ├── MazeGenerator.ts        # Maze generation algorithm
│   ├── MazeRenderer.ts         # DOM rendering for maze
│   └── useMazeNavigation.ts    # Pathfinding and validation
├── useCursor/
│   ├── index.ts                # Public exports
│   ├── useCursor.ts            # Main cursor/input hook
│   ├── useHero.ts              # Player position and movement
│   ├── useHeroRender.ts        # Hero rendering on DOM
│   ├── useVimMotions.ts        # Vim keybinding system
│   ├── useGameKeys.ts          # Game-specific key handling
│   └── useAnimation.ts         # Multi-step movement animation
└── useScore/
    ├── index.ts                # Public exports
    ├── useScore.ts             # Main scoring hook
    ├── useScorePaths.ts        # Distance calculations
    ├── useScoreTime.ts         # Timer integration
    └── useTimer.ts             # Timer state management

---

Type System

All types are centralized in src/types.ts for consistency and maintainability.

Main Types

GameManager

The primary interface returned by useGame().

type GameManager = {
  // DOM reference for rendering
  containerRef: RefObject<HTMLDivElement | null>;
  
  // Rendering
  renderBoard: () => void;
  
  // Core managers
  cursor: CursorManager;
  hero: HeroManager;
  renderer: HeroRenderer;
  scoreManager: ScoreManager;
  
  // Game status
  gameStatus: GameStatus;
  setGameStatus: (status: GameStatus) => void;
  startGame: () => void;
  togglePause: (pause?: boolean) => void;
  quitGame: () => void;
  
  // Input tracking
  keyLog: KeyLogEntry[];
  clearKeyLog: () => void;
  getKeyLog: () => KeyLogEntry[];
};

GameStatus

State machine for game lifecycle.

type GameStatus = 
  | 'waiting'      // Initial state, awaiting start
  | 'started'      // Game in progress, before key pickup
  | 'has-key'      // Key obtained, heading to exit
  | 'paused'       // Game paused
  | 'game-over'    // Game lost (efficiency > 150%)
  | 'game-won';    // Game completed

BoardManager

Manages maze data and rendering.

type BoardManager = {
  containerRef: RefObject<HTMLDivElement | null>;
  mazeRef: RefObject<MazeCell[][]>;
  mazeInstanceRef: RefObject<MazeGenerator | null>;
  rendererRef: RefObject<MazeRenderer | null>;
  renderBoard: () => void;
};

CursorManager

Handles player input and vim motion system.

type CursorManager = {
  position: () => Coord;
  mode: () => CursorMode;
  move: (dCols: number, dRows: number, count: number) => void;
  moveLeft: (count?: number) => void;
  moveRight: (count?: number) => void;
  moveUp: (count?: number) => void;
  moveDown: (count?: number) => void;
  moveToStart: () => void;      // Move to row start (^)
  moveToEnd: () => void;         // Move to row end ($)
  moveToTop: () => void;         // Move to maze top (g)
  moveToBottom: () => void;      // Move to maze bottom (G)
  repeatLastMotion: () => void;  // Repeat last motion (.)
  resetCount: () => void;
  getCount: () => string;
  hasCount: () => boolean;
  setCount: (digit: string) => void;
  setLastKey: (key: string) => void;
  getLastKey: () => string;
  hero?: UseHeroType;
};

HeroManager

Player position and interaction.

type HeroManager = {
  position: Coord | null;
  canMoveTo: (coord: Coord) => boolean;
  moveTo: (coord: Coord) => void;
  pickupKey: () => void;
  reachExit: () => void;
  reset: () => void;
};

HeroRenderer

DOM rendering for hero.

type HeroRenderer = {
  render: () => void;
  updatePosition: (coord: Coord) => void;
  showCoordinates: (show: boolean) => void;
};

ScoreManager

Scoring system return type.

type ScoreManager = {
  timeValue: number;
  startTimer: () => void;
  stopTimer: () => void;
  resetTimer: () => void;
  distToKey: number;         // Distance from hero to key
  distToExit: number;        // Distance from hero to exit
  keystrokes: number;        // Total keystrokes made
  optimalSteps: number;      // Optimal path length
  efficiency: number;        // Percentage (keystrokes / optimal * 100)
  finalScore: number | null; // Only set when game-won
};

Coordinate & Maze Types

Basic data structures.

type Coord = { row: number; col: number };

type CellTag = 'wall' | 'door' | 'entrance' | 'exit' | 'key' | 'hero';

type MazeCell = CellTag[];  // Array of tags for a single cell

type MazeData = {
  maze: MazeCell[][];
  width: number;
  height: number;
  cols: number;
  rows: number;
  totalSteps: number;
};

type GameOptions = {
  rows: number;
  cols: number;
};

---

Core Hooks

useGame()

Main orchestrator hook. Single entry point for all games.

Purpose: Composes all sub-hooks into a unified interface and optionally integrates platform-specific functionality.

Parameters:

useGame(options: GameOptions, platformHook?: unknown): GameManager

// GameOptions
{
  rows: number;    // Maze height in cells
  cols: number;    // Maze width in cells
}

// platformHook (optional)
// A function that receives the GameManager for platform integration
// function(gameManager: GameManager): void

Return Type: GameManager - Complete game interface

Dependencies:

• useBoard() - Maze generation and rendering
• useCursor() - Input and movement
• useGameStatus() - Game lifecycle
• useScore() - Scoring system
• useHeroRender() - Visual rendering

Example:

const gameManager = useGame(
  { cols: 32, rows: 24 },
  platformHook  // Optional platform integration
);

const { containerRef, gameStatus, startGame } = gameManager;

---

useBoard()

Board and maze management.

Purpose: Generates maze, manages its data structure, and handles DOM rendering.

Parameters:

useBoard(cols: number, rows: number): BoardManager

Return Type: BoardManager

{
  containerRef: RefObject<HTMLDivElement | null>;
  mazeRef: RefObject<MazeCell[][]>;
  mazeInstanceRef: RefObject<MazeGenerator | null>;
  rendererRef: RefObject<MazeRenderer | null>;
  renderBoard: () => void;
}

Dependencies:

• MazeGenerator - Generates random maze
• MazeRenderer - Renders maze to DOM
• useMazeNavigation - Pathfinding utilities

Key Features:

• Generates randomized maze on mount
• Places key randomly in maze
• Manages maze reference for navigation
• Handles board re-rendering

Example:

const board = useBoard(32, 24);

// Render maze to DOM
useEffect(() => {
  if (board.containerRef.current) {
    board.renderBoard();
  }
}, [board]);

// Access maze data
const maze = board.mazeRef.current;  // MazeCell[][]

---

useCursor()

Input handling and movement system with vim bindings.

Purpose: Manages player cursor movement, vim key processing, and coordinate tracking.

Parameters:

useCursor(
  board: BoardManager, 
  gameStatusManager: GameStatusManager
): CursorManager & { keyManager: GameKeyManager }

Return Type:

CursorManager & {
  keyManager: {
    keyLog: KeyLogEntry[];
    clearKeyLog: () => void;
    getKeyLog: () => KeyLogEntry[];
  }
}

Vim Motion Support:

• h, j, k, l - Move left, down, up, right
• ^ - Move to row start
• $ - Move to row end
• g - Move to maze top
• G - Move to maze bottom
• . - Repeat last motion
• Number prefixes for counts (e.g., 5j = move down 5 cells)

Dependencies:

• useHero() - Hero position management
• useMazeNavigation() - Path validation
• useVimMotions() - Vim key processing
• useGameKeys() - Game-specific key handling

Example:

const { cursor, keyManager } = useCursor(board, gameStatusManager);

// Direct movement
cursor.moveLeft(5);
cursor.moveDown();

// Query state
const pos = cursor.position();  // { row, col }
const count = cursor.getCount();

// Vim motions are processed by useGameKeys
keyManager.keyLog;  // Track all keystrokes

---

useGameStatus()

Game lifecycle state management.

Purpose: Manages game status transitions (waiting → started → has-key → game-won).

Parameters:

useGameStatus(): GameStatusManager

Return Type:

{
  gameStatus: GameStatus;
  setGameStatus: (status: GameStatus) => void;
  startGame: () => void;
  togglePause: (pause?: boolean) => void;
  quitGame: () => void;
}

State Transitions:

waiting ──start──> started ──pickup key──> has-key
   ▲                 ▲                          ▲
   │                 │        (pause)          │
   │                 └─────────────────────────┘
   │                      paused
   │
   └──quit─────────────────────────────────────┘

started/has-key ──efficiency > 150%──> game-over
started/has-key ──reach exit + has-key──> game-won

Example:

const gameStatus = useGameStatus();

gameStatus.startGame();
gameStatus.togglePause();
gameStatus.quitGame();

---

Supporting Hooks

useScore()

Scoring and performance metrics.

Purpose: Calculates efficiency, tracks time and keystrokes, computes final score.

Parameters:

useScore({
  board: BoardManager;
  hero: UseHeroType;
  gameStatusManager: GameStatusManager;
  keyManager?: { keyLog: any[] };
}): ScoreManager

Return Type: ScoreManager

Scoring Logic:

• Optimal Steps: Calculated as distance(entrance → key) + distance(key → exit)
• Efficiency: Math.round((keystrokes / optimalSteps) * 100)
• Game Over Trigger: efficiency > 150%
• Final Score: Math.round((optimalMs / logicMs) * 100000) when game-won
• Max Score: 100,000 points

Tracking:

• Real-time keystroke count
• Elapsed time
• Distance to key and exit
• Player movement steps

Example:

const score = useScore({ board, hero, gameStatusManager, keyManager });

if (score.efficiency > 100) {
  // Inefficient movement
}

// Final score available only after game-won
if (gameStatus === 'game-won') {
  console.log(`Final Score: ${score.finalScore}`);
}

---

useHero()

Player position and movement logic.

Purpose: Manages hero position, handles cell interactions (key pickup, exit), animates movement.

Parameters:

useHero(
  board: BoardManager,
  gameStatusManager: GameStatusManager
): UseHeroType

Return Type: UseHeroType

Features:

• Tracks player position (row, col)
• Validates moves through maze navigation
• Handles key pickup event
• Handles exit reached event
• Animates multi-step movements
• Prevents movement without key to exit

Cell Interactions:

• Key: Transitions to "has-key" state, removes key from maze
• Exit:
  • Without key: Invalid move
  • With key: Transitions to "game-won"
• Wall: Blocked by path validation

Example:

const hero = useHero(board, gameStatusManager);

// Query position
const pos = hero.heroPos;  // { row, col } | null

// Direct movement
hero.moveTo({ row: 10, col: 15 });

// Check validity
if (hero.canMoveTo(coord)) {
  hero.moveTo(coord);
}

// Reset on game end
hero.reset();

---

useVimMotions()

Vim keybinding and motion system.

Purpose: Processes vim keys, manages motion count prefix, tracks last motion for repeat.

Parameters: None (hook state managed internally)

Return Type: VimMotionSystem

API:

{
  processKey: (key: string) => { type: 'move'|'anchor'|'repeat'|'count', data: any } | null;
  resetCount: () => void;
  getCount: () => number;        // Returns 1 if no count
  hasCount: () => boolean;       // True if user entered count
  setLastMotion: (motion: Motion) => void;
  repeatLastMotion: () => Motion | null;
}

Supported Keys:

Move:   h (left), j (down), k (up), l (right)
Anchor: ^ (start), $ (end), g (top), G (bottom)
Repeat: . (repeat last motion)
Count:  0-9 (prefix for count)

Count Behavior:

• 5j = move down 5 times
• 0 alone = anchor to start (special case)
• 50j = move down 50 times
• Motion repeats use stored count

Example:

const motions = useVimMotions();

const result = motions.processKey('5');  // { type: 'count', data: '5' }
const result = motions.processKey('j');  // { type: 'move', data: { dr: 1, ... } }

motions.setLastMotion({ dr: 0, dc: 1, steps: 5 });
const last = motions.repeatLastMotion();  // Re-executes the motion

---

useGameKeys()

Game-specific key input handling.

Purpose: Bridges vim motion system with game cursor movement.

Parameters:

useGameKeys({
  cursor: CursorManager;
  gameStatusManager: GameStatusManager;
}): GameKeyManager

Return Type: GameKeyManager

Responsibilities:

• Listens for keyboard input
• Routes keys through vim motion processor
• Executes corresponding cursor movements
• Tracks keystroke history
• Handles game-specific keys (space, q, p)

Example:

const keyManager = useGameKeys({ cursor, gameStatusManager });

// Keystroke history available
keyManager.keyLog;  // { key: string, timestamp: number }[]
keyManager.getKeyLog();

---

useAnimation()

Multi-step movement animation system.

Purpose: Animates hero movement over multiple cells smoothly.

Parameters: None

Return Type:

{
  isAnimating: () => boolean;
  animateMovement: (
    from: Coord,
    to: Coord,
    steps: number,
    onStep: (coord: Coord) => void,
    onComplete: () => void
  ) => void;
  cancelAnimation: () => void;
}

Behavior:

• Animates from from to to coordinate over steps cells
• Calls onStep for each intermediate position (enables smooth animation)
• Calls onComplete when finished
• Prevents overlapping animations

Example:

const animation = useAnimation();

animation.animateMovement(
  { row: 5, col: 5 },
  { row: 5, col: 10 },
  5,
  (coord) => {
    // Called 5 times for visualization
    updateHeroDisplay(coord);
  },
  () => {
    // Called when complete
    handleCellInteraction();
  }
);

---

useHeroRender()

DOM rendering for hero character.

Purpose: Renders hero position on the game board DOM.

Parameters:

useHeroRender({
  gameStatus: GameStatus;
  board: BoardManager;
  hero: UseHeroType;
}): HeroRenderer

Return Type: HeroRenderer

Features:

• Renders hero at current position
• Updates hero position on DOM
• Shows/hides coordinate display
• Syncs with board rendering

---

useTimer()

Timer state management.

Purpose: Tracks elapsed game time.

Return Type:

{
  timeValue: number;      // Milliseconds elapsed
  startTimer: () => void;
  stopTimer: () => void;
  resetTimer: () => void;
}

---

useScorePaths()

Pathfinding for distance calculations.

Purpose: Calculates distances for scoring.

Parameters:

useScorePaths({
  board: BoardManager;
  heroPos: Coord | null;
}): { entranceToKey, entranceToExit, heroToKey, heroToExit }

Returns: Path distances or 0 if not calculable

---

useMazeNavigation()

Navigation and validation utilities.

Purpose: Validates moves, finds paths, checks cell accessibility.

Methods:

{
  validatePath: (from: Coord, direction: { row, col }, steps: number) => boolean;
  isValidMove: (from: Coord, to: Coord) => boolean;
  findAnchorTarget: (from: Coord, direction: 'top'|'bottom'|'left'|'right') => Coord | null;
}

---

Implementation Examples

Minimal Game Setup

import { useGame } from '@vim-maze/src';

function MyGame() {
  const gameManager = useGame({ cols: 32, rows: 24 });
  const { containerRef, gameStatus, startGame } = gameManager;

  return (
    <div>
      <div ref={containerRef} />
      <button onClick={startGame}>Start</button>
      <p>Status: {gameStatus}</p>
    </div>
  );
}

Complete Feature Example with Scoring

import { useGame } from '@vim-maze/src';

function GameWithScoring() {
  const gameManager = useGame(
    { cols: 32, rows: 24 },
    platformHook  // Optional
  );
  
  const {
    containerRef,
    gameStatus,
    startGame,
    cursor,
    hero,
    scoreManager,
    keyLog,
  } = gameManager;

  const {
    timeValue,
    efficiency,
    optimalSteps,
    keystrokes,
    finalScore,
  } = scoreManager;

  return (
    <div>
      <div ref={containerRef} />
      
      {gameStatus === 'waiting' && (
        <button onClick={startGame}>Start Game</button>
      )}

      {(gameStatus === 'started' || gameStatus === 'has-key') && (
        <div>
          <p>Time: {formatTime(timeValue)}</p>
          <p>Efficiency: {efficiency}% {efficiency > 150 && '(Game Over!)'}</p>
          <p>Keystrokes: {keystrokes} / {optimalSteps}</p>
        </div>
      )}

      {gameStatus === 'game-won' && (
        <div>
          <h2>You Won!</h2>
          <p>Final Score: {finalScore}</p>
        </div>
      )}
    </div>
  );
}

Custom Platform Hook Integration

function customPlatformHook(gameManager: GameManager) {
  // Called after game initialization
  
  // Track analytics
  console.log('Game initialized:', {
    cols: gameManager.cursor.position().col,
    rows: gameManager.cursor.position().row,
  });

  // Add custom key handlers
  window.addEventListener('keydown', (e) => {
    if (e.key === 'p') {
      gameManager.togglePause();
    }
  });

  // Monitor game events
  const interval = setInterval(() => {
    if (gameManager.gameStatus === 'game-won') {
      console.log('Victory:', gameManager.scoreManager.finalScore);
      clearInterval(interval);
    }
  }, 100);
}

const gameManager = useGame({ cols: 32, rows: 24 }, customPlatformHook);

---

Integration Points

For New Games

1. Initialize: Call useGame(options, platformHook?)
2. Render Container: Attach gameManager.containerRef to DOM
3. Handle Status: React to gameManager.gameStatus changes
4. Access Managers:
   • Movement: gameManager.cursor
   • Scoring: gameManager.scoreManager
   • Input: gameManager.keyLog
   • Hero: gameManager.hero

For Platform Integration

Implement a platform hook function that receives the complete GameManager:

type PlatformHook = (gameManager: GameManager) => void;

The hook can:

• Add custom key bindings
• Track analytics
• Synchronize with platform APIs
• Monitor game state
• Control game lifecycle

Customization Points

The current implementation supports:

1. Board Size: Adjust cols and rows in GameOptions
2. Key Bindings: Via useGameKeys in custom implementations
3. Rendering: Override via useHeroRender for custom visuals
4. Scoring: Modify useScore for different scoring formulas
5. Maze Generation: Extend MazeGenerator for different algorithms

Data Flow

Game Initialization
    ↓
useGame() composes hooks
    ├→ useBoard() generates maze
    ├→ useCursor() initializes input
    ├→ useGameStatus() initializes state
    └→ useScore() initializes scoring
    
User Input
    ↓
useGameKeys() processes keystroke
    ↓
useVimMotions() interprets vim command
    ↓
useCursor() executes movement
    ↓
useHero() validates and animates
    ↓
useScore() updates metrics
    ↓
Rendering updates via refs

---

Type Safety Patterns

Hook Return Types

All hook return types are explicitly defined in src/types.ts. Import them directly:

import type { GameManager, CursorManager, ScoreManager } from './types';
import type { TimerManager, HeroRenderManager, AnimationSystem } from './types';

Type Imports

Always import types with import type:

import type { GameManager, CursorManager, Coord } from './types';
import { useGame } from './useGame';

Coordinate Operations

Common patterns for working with coordinates:

// Validate before moving
if (hero.canMoveTo(targetCoord)) {
  hero.moveTo(targetCoord);
}

// Calculate distance
const distance = Math.abs(pos1.row - pos2.row) + 
                 Math.abs(pos1.col - pos2.col);

// Check if equal
const same = pos1.row === pos2.row && pos1.col === pos2.col;

---

Summary

The vim-maze unified API provides a composable, type-safe game engine:

• Single Entry Point: useGame() for all initialization
• Modular Design: Independent, reusable hooks
• Type Safe: Comprehensive TypeScript support
• Extensible: Platform hook system for customization
• Well Structured: Clear separation of concerns

For detailed implementation, refer to source files in src/.