rand.ts

import * as R from "ramda";
import * as seedrandom from "seedrandom";
import logger from "./logger";

export const resetGenerator = () => {
  generator = seedrandom(process.env.E2E ? "some value" : undefined);
  return generator;
};

let generator: ReturnType<typeof seedrandom> = resetGenerator();

export const rand = (min: number, max: number) =>
  Math.floor(generator() * (max + 1 - min)) + min;

export const diceRoll = (fromPoints: number, toPoints: number): [number[], number[], boolean] => {
  const fromRoll = R.range(0, fromPoints).map(_ => rand(1, 6));
  const toRoll = R.range(0, toPoints).map(_ => rand(1, 6));
  const success = R.sum(fromRoll) > R.sum(toRoll);
  return [fromRoll, toRoll, success];
};

export const shuffle = <T>(a: readonly T[]): readonly T[] => {
  const b = a.slice();
  for (let i = b.length - 1; i > 0; i--) {
    const j = rand(0, i);
    [b[i], b[j]] = [b[j], b[i]];
  }
  return b;
};