AdventOfCode-js-2019/13/common.js

const gameTiles = [
    ".", // Empty
    "█", // Wall
    "▪", // Block
    "_", // Paddle
    "°", // Ball
];

/**
 * Render the arcade screen
 *
 * @param {number[]} screenState An array of numbers represent the state of the arcade screen
 * @param {boolean} autoplay If true, the game will autoplay itself
 * @returns {void}
 */
function _render(screenState) {
    if (screenState.length % 3 != 0) {
        console.warn("screenState length is not divisible by three!");
    }

    /** @type {number[][]} */
    let board = [];
    let boardWidth = -1;
    let boardHeight = -1;
    let blockTileCount = 0;
    let gameScore = 0;
    let ballX = 0;
    let paddleX = 0;

    for (let i = 0; i < screenState.length; i += 3) {
        const x = screenState[i];
        const y = screenState[i + 1];
        const tile = screenState[i + 2];

        if (x == -1) { gameScore = tile; }

        // Track the board dimensions
        if (x > boardWidth) { boardWidth = x; }
        if (y > boardHeight) { boardHeight = y; }

        // create a row for the y dimension if it doesn't already exist
        if (!board[y]) { board[y] = []; }

        // If the current tile is the ball, store the x coord for autoplay
        if (tile == 3) { paddleX = x; }
        else if (tile == 4) { ballX = x; }

        board[y][x] = tile;
    }

    board = normalizeBoard(board, boardWidth, boardHeight);
    let boardString = "";

    for (const row of board) {
        for (const tile of row) {
            if (tile == 2) {
                blockTileCount++;
            }
            boardString += gameTiles[tile];
        }
        boardString += "\n";
    }

    return [boardString, gameScore, blockTileCount, ballX, paddleX];
}

function renderToConsole(screenState) {
    const [boardState, gameScore, blockTileCount, ballX, paddleX] = _render(screenState);
    console.clear();
    console.log("Score: ", gameScore);
    console.log(boardState);
    console.log("Block Tile Count: ", blockTileCount);

    return [ballX, paddleX];
}

function normalizeBoard(board, width, height) {
    for (let h = 0; h <= height; h++) {
        if (!board[h]) { board[h] = []; }
        for (let w = 0; w <= width; w++) {
            if (board[h][w] == undefined) { board[h][w] = 0; }
        }
    }

    return board;
}

module.exports = {
    render: renderToConsole,
};