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Raj"},"license":"MIT","homepage":"https://github.com/ayshrj/ludo.js#readme","keywords":["ludo","board game","typescript","game","ai"],"repository":{"type":"git","url":"git+https://github.com/ayshrj/ludo.js.git"},"description":"A TypeScript-based headless Ludo game engine for simulating game logic, AI moves, and game state management.","maintainers":[{"name":"ayshrj","email":"ayshrj10@gmail.com"}],"readme":"# @ayshrj/ludo.js\r\n\r\n[![npm](https://img.shields.io/npm/v/@ayshrj/ludo.js?color=blue)](https://www.npmjs.com/package/@ayshrj/ludo.js)\r\n[![npm](https://img.shields.io/npm/dm/@ayshrj/ludo.js)](https://www.npmjs.com/package/@ayshrj/ludo.js)\r\n\r\n**@ayshrj/ludo.js** is a TypeScript library for simulating the classic Ludo board\r\ngame. It handles:\r\n\r\n- **Board Setup** (2, 3, or 4 players)\r\n- **Dice Rolling** (automatic skip after three consecutive sixes)\r\n- **Token Movement** (including leaving home on a 6)\r\n- **Capturing Opponents** on non-safe squares\r\n- **Safe Zones & Final Squares**\r\n- **Ranking** (tracks order in which players finish)\r\n- **Lightweight AI** with `bestMove()`\r\n- **EventEmitter-based Updates** (automatically emit `\"stateChange\"` with the latest state)\r\n- **Comprehensive State Tracking** for easy integration into any UI\r\n\r\n---\r\n\r\n## Table of Contents\r\n\r\n- [@ayshrj/ludo.js](#ayshrjludojs)\r\n - [Table of Contents](#table-of-contents)\r\n - [Installation](#installation)\r\n - [Importing](#importing)\r\n - [Import (as ESM)](#import-as-esm)\r\n - [Import (as CommonJS)](#import-as-commonjs)\r\n - [Quick Start Example](#quick-start-example)\r\n - [Features](#features)\r\n - [API](#api)\r\n - [Constructor: `new Ludo(numberOfPlayers)`](#constructor-new-ludonumberofplayers)\r\n - [`.rollDiceForCurrentPiece()`](#rolldiceforcurrentpiece)\r\n - [`.selectToken(tokenIndex)`](#selecttokentokenindex)\r\n - [`.bestMove()`](#bestmove)\r\n - [`.reset()`](#reset)\r\n - [`.getCurrentState()`](#getcurrentstate)\r\n - [`.tokenPositions`](#tokenpositions)\r\n - [`.validTokenIndices`](#validtokenindices)\r\n - [`.ranking`](#ranking)\r\n - [`.gameState`](#gamestate)\r\n - [`.currentPiece`](#currentpiece)\r\n - [Event Emitter: `\"stateChange\"`](#event-emitter-statechange)\r\n - [`.players`](#players)\r\n - [`initializeTokenPosition()`](#initializetokenposition)\r\n - [Example: React Integration](#example-react-integration)\r\n - [Advanced Usage Notes](#advanced-usage-notes)\r\n - [License](#license)\r\n\r\n---\r\n\r\n## Installation\r\n\r\n```bash\r\nnpm install @ayshrj/ludo.js\r\n```\r\nor\r\n```bash\r\nyarn add @ayshrj/ludo.js\r\n```\r\n\r\n---\r\n\r\n## Importing\r\n\r\n### Import (as ESM)\r\n\r\n```js\r\nimport { Ludo } from '@ayshrj/ludo.js'\r\n```\r\n\r\n### Import (as CommonJS)\r\n\r\n```js\r\nconst { Ludo } = require('@ayshrj/ludo.js')\r\n```\r\n\r\n---\r\n\r\n## Quick Start Example\r\n\r\n```ts\r\nimport { Ludo } from '@ayshrj/ludo.js'\r\n\r\n// Create a Ludo game with 4 players\r\nconst game = new Ludo(4)\r\n\r\n// Subscribe to state changes (optional)\r\ngame.on(\"stateChange\", (state) => {\r\n console.log(\"STATE CHANGE:\", state)\r\n})\r\n\r\n// Roll the dice\r\nconst diceValue = game.rollDiceForCurrentPiece()\r\nconsole.log(`Dice: ${diceValue}`)\r\n\r\n// If there's a valid token, select it\r\nif (game.validTokenIndices.length > 0) {\r\n game.selectToken(game.validTokenIndices[0])\r\n}\r\n\r\n// Or use the basic AI\r\nconst best = game.bestMove()\r\nif (best >= 0) game.selectToken(best)\r\n```\r\n\r\n---\r\n\r\n## Features\r\n\r\n1. **2, 3, or 4 Players** \r\n Colors are chosen from `[\"blue\",\"red\",\"green\",\"yellow\"]` based on the\r\n requested number of players.\r\n\r\n2. **Dice Rolling** \r\n Rolls `1..6`. Three consecutive sixes skip your turn.\r\n\r\n3. **Movement & Safe Zones** \r\n Leave home only on a 6. Safe squares cannot be captured.\r\n\r\n4. **Capturing** \r\n If you land on an opponent in a non-safe zone, that opponent’s token goes\r\n home (`-1`).\r\n\r\n5. **Final & Ranking** \r\n Index `56` is the final square; finishing all 4 tokens places you in `ranking`.\r\n\r\n6. **Simple AI** \r\n `bestMove()` returns a recommended token index.\r\n\r\n7. **Event Emitter** \r\n The `Ludo` class extends Node.js’s `EventEmitter`. Each time the internal\r\n state changes (after rolls, moves, etc.), it emits `\"stateChange\"` with the\r\n updated `LudoGameState`.\r\n\r\n---\r\n\r\n## API\r\n\r\n### Constructor: `new Ludo(numberOfPlayers)`\r\n\r\n```ts\r\n// 2 players => uses [\"blue\",\"green\"]\r\n// 3 players => uses [\"blue\",\"red\",\"green\"]\r\n// 4 players => uses [\"blue\",\"red\",\"green\",\"yellow\"]\r\nconst game = new Ludo(4)\r\n```\r\n\r\n---\r\n\r\n### `.rollDiceForCurrentPiece()`\r\nRolls a 6-sided die and updates `currentDiceRoll`, `lastDiceRoll`, and\r\n`validTokenIndices`. Automatically skips turn on three consecutive sixes or if\r\nthere are no valid moves.\r\n\r\n---\r\n\r\n### `.selectToken(tokenIndex)`\r\nMoves the chosen token for the current color using the last dice roll. Handles\r\ncaptures, final squares, turn passing, etc.\r\n\r\n---\r\n\r\n### `.bestMove()`\r\nA basic heuristic that returns the “best” token index or -1 if none.\r\n\r\n---\r\n\r\n### `.reset()`\r\nCompletely reinitializes the board and picks a new starting player randomly.\r\n\r\n---\r\n\r\n### `.getCurrentState()`\r\nReturns a snapshot of the entire state:\r\n\r\n```ts\r\ninterface LudoGameState {\r\n turn: Color;\r\n tokenPositions: TokenPositions;\r\n ranking: Color[];\r\n boardStatus: string;\r\n diceRoll: number | null;\r\n lastDiceRoll: number | null;\r\n gameState: GameState;\r\n players: Color[];\r\n}\r\n```\r\n\r\n---\r\n\r\n### `.tokenPositions`\r\nA record of each color’s four token positions (`-1` for home, `0..56` on track).\r\n\r\n---\r\n\r\n### `.validTokenIndices`\r\nWhich tokens (0..3) the current color can move on their turn. \r\nUpdated when `.rollDiceForCurrentPiece()` is called.\r\n\r\n---\r\n\r\n### `.ranking`\r\nColors finish in order. If `ranking.length` equals number of players, the game is\r\ncomplete.\r\n\r\n---\r\n\r\n### `.gameState`\r\nOne of:\r\n- `\"playerHasToRollADice\"`\r\n- `\"playerHasToSelectAPosition\"`\r\n- `\"gameFinished\"`\r\n\r\n---\r\n\r\n### `.currentPiece`\r\nWhich color’s turn it is right now.\r\n\r\n---\r\n\r\n### Event Emitter: `\"stateChange\"`\r\nEvery time the game state changes (e.g., after a roll or move), the library\r\ncalls: \r\n```ts\r\nthis.emit(\"stateChange\", this.getCurrentState())\r\n```\r\nSo you can do:\r\n```ts\r\ngame.on(\"stateChange\", (state) => {\r\n // React or update UI automatically with the new state\r\n})\r\n```\r\n\r\n---\r\n\r\n### `.players`\r\nThe array of active colors, in turn order. For example, with 3 players it might\r\nbe `[\"blue\",\"red\",\"green\"]`.\r\n\r\n---\r\n\r\n### `initializeTokenPosition()`\r\nA utility function that initializes the token positions for all colors. Each token starts at `-1` (home).\r\n\r\n```ts\r\n/**\r\n * Initializes the token positions for all colors.\r\n * @returns {TokenPositions} An object with token positions for each color.\r\n * @example\r\n * const tokenPositions = initializeTokenPosition();\r\n * // Returns:\r\n * // {\r\n * // red: [-1, -1, -1, -1],\r\n * // green: [-1, -1, -1, -1],\r\n * // yellow: [-1, -1, -1, -1],\r\n * // blue: [-1, -1, -1, -1]\r\n * // }\r\n */\r\nfunction initializeTokenPosition(): TokenPositions;\r\n```\r\n\r\n---\r\n\r\n## Example: React Integration\r\n\r\n```tsx\r\nimport React, { useState, useEffect, useCallback, useRef } from \"react\";\r\nimport {\r\n Ludo,\r\n Color,\r\n LudoGameState,\r\n initializeTokenPosition,\r\n} from \"@ayshrj/ludo.js\";\r\n\r\n// Available color sets for 2/3/4 players:\r\nconst COLOR_SETS: Record<2 | 3 | 4, Color[]> = {\r\n 2: [\"blue\", \"green\"],\r\n 3: [\"blue\", \"red\", \"green\"],\r\n 4: [\"blue\", \"red\", \"green\", \"yellow\"],\r\n};\r\n\r\nconst LudoPage: React.FC = () => {\r\n const [playerCount, setPlayerCount] = useState<2 | 3 | 4>(4);\r\n const [playerTypes, setPlayerTypes] = useState<\r\n Record\r\n >({\r\n blue: \"human\",\r\n red: \"human\",\r\n green: \"human\",\r\n yellow: \"human\",\r\n });\r\n const [ludo, setLudo] = useState(null);\r\n const [gameState, setGameState] = useState({\r\n turn: \"blue\",\r\n ranking: [],\r\n tokenPositions: initializeTokenPosition(),\r\n boardStatus: \"\",\r\n diceRoll: null,\r\n lastDiceRoll: null,\r\n gameState: \"playerHasToRollADice\",\r\n players: [],\r\n });\r\n const [showSetupModal, setShowSetupModal] = useState(true);\r\n const [showResetModal, setShowResetModal] = useState(false);\r\n const [botThinking, setBotThinking] = useState(false);\r\n const botTimeoutRef = useRef | null>(null);\r\n\r\n useEffect(() => {\r\n if (!ludo) return;\r\n const handleStateChange = (newState: LudoGameState) => {\r\n setGameState(newState);\r\n };\r\n ludo.on(\"stateChange\", handleStateChange);\r\n return () => {\r\n ludo.off(\"stateChange\", handleStateChange);\r\n };\r\n }, [ludo]);\r\n\r\n const s = gameState;\r\n const isGameFinished =\r\n s.ranking.length >= s.players.length && s.players.length > 0;\r\n\r\n const startNewGame = useCallback(() => {\r\n const chosenColors = COLOR_SETS[playerCount];\r\n const newLudo = new Ludo(playerCount);\r\n newLudo.players = chosenColors;\r\n newLudo.reset();\r\n setGameState(newLudo.getCurrentState());\r\n setLudo(newLudo);\r\n setShowSetupModal(false);\r\n setShowResetModal(false);\r\n }, [playerCount]);\r\n\r\n useEffect(() => {\r\n if (!ludo || isGameFinished) return;\r\n if (s.gameState !== \"playerHasToRollADice\") return;\r\n\r\n const botTurn = playerTypes[s.turn] === \"bot\";\r\n if (!botTurn || botThinking) return;\r\n\r\n setBotThinking(true);\r\n botTimeoutRef.current = setTimeout(() => {\r\n ludo.rollDiceForCurrentPiece();\r\n setBotThinking(false);\r\n }, 1200);\r\n }, [\r\n ludo,\r\n s.gameState,\r\n s.turn,\r\n s.players,\r\n botThinking,\r\n isGameFinished,\r\n playerTypes,\r\n ]);\r\n\r\n useEffect(() => {\r\n if (!ludo || isGameFinished) return;\r\n if (s.gameState !== \"playerHasToSelectAPosition\" || s.diceRoll === null)\r\n return;\r\n\r\n const botTurn = playerTypes[s.turn] === \"bot\";\r\n if (!botTurn || botThinking) return;\r\n\r\n setBotThinking(true);\r\n botTimeoutRef.current = setTimeout(() => {\r\n const best = ludo.bestMove();\r\n if (best >= 0) {\r\n ludo.selectToken(best);\r\n }\r\n setBotThinking(false);\r\n }, 800);\r\n }, [\r\n ludo,\r\n s.gameState,\r\n s.turn,\r\n s.players,\r\n s.diceRoll,\r\n botThinking,\r\n isGameFinished,\r\n playerTypes,\r\n ]);\r\n\r\n const handleRollDice = (): void => {\r\n if (!ludo || isGameFinished) return;\r\n const { turn } = ludo.getCurrentState();\r\n if (playerTypes[turn] === \"bot\") return;\r\n setTimeout(() => {\r\n ludo.rollDiceForCurrentPiece();\r\n }, 1000);\r\n };\r\n\r\n const handleTokenClick = (color: Color, tokenIndex: number): void => {\r\n if (!ludo || isGameFinished) return;\r\n const st = ludo.getCurrentState();\r\n if (color !== st.turn) return;\r\n if (playerTypes[color] === \"bot\") return;\r\n if (!ludo.validTokenIndices.includes(tokenIndex)) return;\r\n ludo.selectToken(tokenIndex);\r\n };\r\n\r\n const colorMap: Record = {\r\n red: \"#FF0000\",\r\n green: \"#00FF00\",\r\n yellow: \"#FFFF00\",\r\n blue: \"#0000FF\",\r\n };\r\n\r\n function getColorOffset(index: number, totalColors: number) {\r\n const offset = 10;\r\n if (totalColors === 1) return { x: 0, y: 0 };\r\n if (totalColors === 2)\r\n return index === 0\r\n ? { x: -offset, y: -offset }\r\n : { x: offset, y: offset };\r\n if (totalColors === 3) {\r\n if (index === 0) return { x: -offset, y: -offset };\r\n if (index === 1) return { x: offset, y: -offset };\r\n if (index === 2) return { x: offset, y: offset };\r\n }\r\n if (totalColors === 4) {\r\n if (index === 0) return { x: -offset, y: -offset };\r\n if (index === 1) return { x: offset, y: -offset };\r\n if (index === 2) return { x: -offset, y: offset };\r\n if (index === 3) return { x: offset, y: offset };\r\n }\r\n return { x: 0, y: 0 };\r\n }\r\n\r\n const startingPositions: Record = {\r\n red: [\r\n [1, 1],\r\n [1, 4],\r\n [4, 1],\r\n [4, 4],\r\n ],\r\n green: [\r\n [1, 10],\r\n [1, 13],\r\n [4, 10],\r\n [4, 13],\r\n ],\r\n blue: [\r\n [10, 1],\r\n [10, 4],\r\n [13, 1],\r\n [13, 4],\r\n ],\r\n yellow: [\r\n [10, 10],\r\n [10, 13],\r\n [13, 10],\r\n [13, 13],\r\n ],\r\n };\r\n\r\n const getTokensAtSquare = (\r\n rowIndex: number,\r\n colIndex: number\r\n ): { token: Color; index: number }[] => {\r\n if (!ludo) return [];\r\n const tokens: { token: Color; index: number }[] = [];\r\n s.players.forEach((color) => {\r\n s.tokenPositions[color].forEach((pos, i) => {\r\n if (pos !== -1) {\r\n const [r2, c2] = ludo.colorPaths[color][pos];\r\n if (r2 === rowIndex && c2 === colIndex) {\r\n tokens.push({ token: color, index: i });\r\n }\r\n } else {\r\n const [hr, hc] = startingPositions[color][i];\r\n if (hr === rowIndex && hc === colIndex) {\r\n tokens.push({ token: color, index: i });\r\n }\r\n }\r\n });\r\n });\r\n return tokens;\r\n };\r\n\r\n const groupTokensByColor = (\r\n tokens: { token: Color; index: number }[]\r\n ): { token: Color; total: number }[] => {\r\n const counts: Record = {\r\n red: 0,\r\n green: 0,\r\n blue: 0,\r\n yellow: 0,\r\n };\r\n tokens.forEach(({ token }) => {\r\n counts[token]++;\r\n });\r\n return Object.entries(counts)\r\n .filter(([, cnt]) => cnt > 0)\r\n .map(([color, total]) => ({ token: color as Color, total }));\r\n };\r\n\r\n let statusMessage = \"No game in progress.\";\r\n if (ludo) {\r\n if (isGameFinished) {\r\n statusMessage = `Game finished! Final ranking: ${s.ranking.join(\" -> \")}`;\r\n } else {\r\n statusMessage = `${s.turn.toUpperCase()}'s turn.`;\r\n if (s.lastDiceRoll !== null) {\r\n statusMessage += ` (Last roll: ${s.lastDiceRoll})`;\r\n }\r\n if (s.boardStatus) {\r\n statusMessage += ` — ${s.boardStatus}`;\r\n }\r\n }\r\n }\r\n\r\n const isDiceDisabled =\r\n !ludo ||\r\n isGameFinished ||\r\n s.gameState !== \"playerHasToRollADice\" ||\r\n playerTypes[s.turn] === \"bot\" ||\r\n botThinking;\r\n\r\n const modalStyle: React.CSSProperties = {\r\n position: \"fixed\",\r\n top: \"50%\",\r\n left: \"50%\",\r\n transform: \"translate(-50%, -50%)\",\r\n backgroundColor: \"white\",\r\n padding: \"20px\",\r\n borderRadius: \"8px\",\r\n boxShadow: \"0 4px 6px rgba(0, 0, 0, 0.1)\",\r\n zIndex: 1000,\r\n };\r\n\r\n const buttonStyle: React.CSSProperties = {\r\n padding: \"10px 20px\",\r\n borderRadius: \"4px\",\r\n border: \"none\",\r\n cursor: \"pointer\",\r\n fontSize: \"16px\",\r\n };\r\n\r\n const selectStyle: React.CSSProperties = {\r\n padding: \"5px\",\r\n borderRadius: \"4px\",\r\n border: \"1px solid #ccc\",\r\n fontSize: \"16px\",\r\n };\r\n\r\n return (\r\n \r\n {/* Game Status */}\r\n \r\n {statusMessage}\r\n \r\n\r\n {/* Board */}\r\n {ludo ? (\r\n \r\n \r\n {ludo.board.map((row, rowIndex) =>\r\n row.map((col, colIndex) => {\r\n const rawTokens = getTokensAtSquare(rowIndex, colIndex);\r\n const groupedTokens = groupTokensByColor(rawTokens);\r\n return (\r\n \r\n {groupedTokens.map(({ token, total }, i) => {\r\n const isCurrentPlayerStack =\r\n token === s.turn &&\r\n rawTokens.some(\r\n (t) =>\r\n t.token === token &&\r\n ludo.validTokenIndices.includes(t.index)\r\n );\r\n const onCircleClick = () => {\r\n const validToken = rawTokens.find(\r\n (t) =>\r\n t.token === token &&\r\n ludo.validTokenIndices.includes(t.index)\r\n );\r\n if (validToken) {\r\n handleTokenClick(validToken.token, validToken.index);\r\n }\r\n };\r\n const offset = getColorOffset(i, groupedTokens.length);\r\n return (\r\n \r\n {total > 1 ? total : \"\"}\r\n \r\n );\r\n })}\r\n {col?.isSafeZone &&\r\n !col?.isStartingPosition &&\r\n !col?.isFinalPosition && (\r\n \r\n \r\n \r\n )}\r\n \r\n );\r\n })\r\n )}\r\n \r\n \r\n ) : (\r\n \r\n No Game Yet\r\n \r\n )}\r\n\r\n {/* Ranking/Turn Info & Controls */}\r\n \r\n {s.ranking.length > 0 && !isGameFinished && (\r\n
\r\n Current Ranking: {s.ranking.join(\" -> \")}\r\n
\r\n )}\r\n {isGameFinished && (\r\n
\r\n Final Ranking: {s.ranking.join(\" -> \")}\r\n
\r\n )}\r\n {!isGameFinished && ludo && (\r\n \r\n Roll Dice\r\n \r\n )}\r\n setShowResetModal(true)}\r\n >\r\n Reset\r\n \r\n \r\n\r\n {/* Setup Modal */}\r\n {showSetupModal && !ludo && (\r\n
\r\n

Ludo Setup

\r\n \r\n \r\n \r\n setPlayerCount(+e.target.value as 2 | 3 | 4)}\r\n style={selectStyle}\r\n >\r\n \r\n \r\n \r\n \r\n
\r\n {COLOR_SETS[playerCount].map((color) => (\r\n \r\n \r\n {color}:\r\n \r\n \r\n setPlayerTypes((prev) => ({\r\n ...prev,\r\n [color]: e.target.value as \"human\" | \"bot\",\r\n }))\r\n }\r\n style={selectStyle}\r\n >\r\n \r\n \r\n \r\n \r\n ))}\r\n \r\n Start\r\n \r\n \r\n \r\n )}\r\n\r\n {/* Reset Confirmation Modal */}\r\n {showResetModal && (\r\n
\r\n

Reset Game

\r\n \r\n

Are you sure you want to start a new Ludo game?

\r\n
\r\n setShowResetModal(false)}\r\n >\r\n Cancel\r\n \r\n {\r\n setShowResetModal(false);\r\n setLudo(null);\r\n setShowSetupModal(true);\r\n }}\r\n >\r\n Start\r\n \r\n
\r\n
\r\n \r\n )}\r\n \r\n );\r\n};\r\n\r\nexport default LudoPage;\r\n```\r\n\r\n---\r\n\r\n## Advanced Usage Notes\r\n\r\n1. **Skipping / Passing** \r\n If `.rollDiceForCurrentPiece()` yields no valid moves, it auto-passes to the\r\n next player.\r\n2. **Consecutive Sixes** \r\n Rolling three in a row ends your turn immediately.\r\n3. **Event-Driven Updates** \r\n Subscribing to `\"stateChange\"` means you can react to changes\r\n without manually querying the state after every call.\r\n\r\n---\r\n\r\n## License\r\n\r\nMIT License. Feel free to modify or contribute!\r\n\r\n---","readmeFilename":"README.md"}