game-board.ts

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`38c7e27c` 2022-03-22 Pavel Safronov	1	import { Coord } from "./coord";
`b3c7b964` 2022-03-22 Pavel Safronov	2
	3	export class GameBoard {
`417dc266` 2022-03-23 Pavel Safronov	4	public board: (string \| null)[];
`b3c7b964` 2022-03-22 Pavel Safronov	5	public readonly size: Coord;
	6	public readonly player1Id: string;
	7	public readonly player2Id: string;
	8
	9	public constructor(player1Id: string, player2Id: string) {
	10	// default board
`417dc266` 2022-03-23 Pavel Safronov	11	const defaultBoard = ([] as (string \| null)[]).concat.apply([], [
	12	[player1Id, null, null, player2Id],
	13	[null, player1Id, player2Id, null],
	14	[null, player2Id, player1Id, null],
	15	[player2Id, null, null, player1Id]]);
	16	const testBoard = ([] as (string \| null)[]).concat.apply([], [
	17	[player1Id, null, player2Id, player2Id],
	18	[player1Id, null, player2Id, null],
	19	[player1Id, null, null, null],
	20	[null, player1Id, null, player2Id]]);
	21	this.board = defaultBoard;
`b3c7b964` 2022-03-22 Pavel Safronov	22	this.size = new Coord(4, 4);
	23	this.player1Id = player1Id;
	24	this.player2Id = player2Id;
	25	}
	26	public move(source: Coord, dest: Coord): void {
`417dc266` 2022-03-23 Pavel Safronov	27	const piece = this.getPiece(source);
	28	if (piece === null)
`b3c7b964` 2022-03-22 Pavel Safronov	29	throw `Source ${source} points to an empty space`;
`417dc266` 2022-03-23 Pavel Safronov	30	this.setPiece(source, null);
	31	this.setPiece(dest, piece);
`b3c7b964` 2022-03-22 Pavel Safronov	32	}
`417dc266` 2022-03-23 Pavel Safronov	33	public getPiece(coord: Coord): string \| null {
`b3c7b964` 2022-03-22 Pavel Safronov	34	const index = this.coordToBoardIndex(coord);
	35	if (!Number.isSafeInteger(index) \|\| index < 0 \|\| index >= this.board.length)
	36	throw `Index ${index} is out of bounds`;
	37	const id = this.board[index];
`417dc266` 2022-03-23 Pavel Safronov	38	return id;
`b3c7b964` 2022-03-22 Pavel Safronov	39	}
	40	public getCoords(id: string): Coord[] {
	41	const coords = this.board
	42	.map((pieceId, index) => {
	43	const isTarget = pieceId === id;
	44	return isTarget ? this.boardIndexToCoord(index) : null;
	45	})
`417dc266` 2022-03-23 Pavel Safronov	46	.filter((coord) => coord !== null)
	47	.map(coord => coord!);
`b3c7b964` 2022-03-22 Pavel Safronov	48	return coords;
	49	}
`417dc266` 2022-03-23 Pavel Safronov	50	private setPiece(coord: Coord, piece: string \| null): void {
	51	const { player1Id, player2Id } = this;
	52	if (piece !== null && piece !== player1Id && piece !== player2Id)
	53	throw `Invalid piece specified: ${piece}`;
`b3c7b964` 2022-03-22 Pavel Safronov	54	const index = this.coordToBoardIndex(coord);
	55	if (!Number.isSafeInteger(index) \|\| index < 0 \|\| index >= this.board.length)
	56	throw `Index ${index} is out of bounds`;
`417dc266` 2022-03-23 Pavel Safronov	57	this.board[index] = piece;
`b3c7b964` 2022-03-22 Pavel Safronov	58	}
	59	public coordToBoardIndex(coord: Coord): number {
	60	const { row, col } = coord;
	61	const index = row * this.size.col + col;
	62	return index;
	63	}
`417dc266` 2022-03-23 Pavel Safronov	64	public boardIndexToCoord(index: number): Coord {
`b3c7b964` 2022-03-22 Pavel Safronov	65	const col = index % this.size.col;
	66	const row = Math.floor(index / this.size.col);
	67	return new Coord(row, col);
	68	}
	69	}