game-board.ts

1	import { Coord } from "./types";
2
3
4	export class GameBoard {
5	private board: (string \| null)[];
6	public readonly size: Coord;
7	public readonly player1Id: string;
8	public readonly player2Id: string;
9
10	public constructor(player1Id: string, player2Id: string) {
11	// default board
12	const defaultBoard = []
13	.concat([player1Id, null, null, player2Id])
14	.concat([null, player1Id, player2Id, null])
15	.concat([null, player2Id, player1Id, null])
16	.concat([player2Id, null, null, player1Id]);
17	const testBoard = []
18	.concat([player1Id, null, player2Id, player2Id])
19	.concat([player1Id, null, player2Id, null])
20	.concat([player1Id, null, null, null])
21	.concat([null, player1Id, null, player2Id]);
22	this.board = testBoard;
23	this.size = new Coord(4, 4);
24	this.player1Id = player1Id;
25	this.player2Id = player2Id;
26	}
27	public move(source: Coord, dest: Coord): void {
28	const isP1 = this.get(source);
29	if (isP1 === null)
30	throw `Source ${source} points to an empty space`;
31	this.set(source, null);
32	this.set(dest, isP1);
33	}
34	public get(coord: Coord): boolean \| null {
35	const index = this.coordToBoardIndex(coord);
36	if (!Number.isSafeInteger(index) \|\| index < 0 \|\| index >= this.board.length)
37	throw `Index ${index} is out of bounds`;
38	const id = this.board[index];
39	const isP1 = id === null ? null : id === this.player1Id;
40	return isP1;
41	}
42	public getCoords(id: string): Coord[] {
43	const coords = this.board
44	.map((pieceId, index) => {
45	const isTarget = pieceId === id;
46	return isTarget ? this.boardIndexToCoord(index) : null;
47	})
48	.filter((coord) => coord !== null);
49	return coords;
50	}
51	private set(coord: Coord, isP1: boolean \| null): void {
52	const index = this.coordToBoardIndex(coord);
53	if (!Number.isSafeInteger(index) \|\| index < 0 \|\| index >= this.board.length)
54	throw `Index ${index} is out of bounds`;
55	this.board[index] = isP1 === null ? null : isP1 ? this.player1Id : this.player2Id;
56	}
57	public coordToBoardIndex(coord: Coord): number {
58	const { row, col } = coord;
59	const index = row * this.size.col + col;
60	return index;
61	}
62	private boardIndexToCoord(index: number): Coord {
63	const col = index % this.size.col;
64	const row = Math.floor(index / this.size.col);
65	return new Coord(row, col);
66	}
67	}