boardgame-core/src/core/part.ts

import {Entity} from "../utils/entity";
import {Region} from "./region";
import {RNG} from "../utils/rng";

export type Part = {
  id: string;

  sides?: number;
  side?: number;

  alignments?: string[];
  alignment?: string;
  region: Entity<Region>;
  position: number[];
}

export function flip(part: Entity<Part>) {
  part.produce(draft => {
    if(!draft.sides)return;
    draft.side = ((draft.side||0) + 1) % draft.sides;
  });
}

export function flipTo(part: Entity<Part>, side: number) {
  part.produce(draft => {
    if(!draft.sides || side >= draft.sides)return;
    draft.side = side;
  });
}

export function roll(part: Entity<Part>, rng: RNG) {
  part.produce(draft => {
    if(!draft.sides)return;
    draft.side = rng.nextInt(draft.sides);
  });
}