import { sum } from '../util/sum.js';
import { random } from "./random.js";

const { round } = Math;


/**
 * Returns a random integer in the range `[minV, maxV]`
 * 
 * * range includes its endpoints
 * 
 * @param minV 
 * @param maxV 
 * @param rngIdx 
 * 
 * * **not optimized**; **use in tests only!**
 */
function randomIntInRange(
        minV: number,
        maxV: number,
        rngIdx?: number | undefined): number {

    const terms: number[] = [];
    const range = maxV - minV + 1;
    for (let i=0; i<32; i++) {
        const rand = random(rngIdx !== undefined ? 32*rngIdx + i : undefined);
        const v = round(rand/(Number.EPSILON/2))%(2**32);
        const multiplier = 2**(32*i);
        if (multiplier > range) { break; }
        terms.push(multiplier * v);
    }

    return (sum(terms) % range) + minV;
}


export { randomIntInRange }