import { IInterval } from '../interfaces';

const INTERVAL = 500;

export const createStartIntervalScheduler =
    (clearInterval: Window['clearInterval'], performance: Window['performance'], setInterval: Window['setInterval']) =>
    (next: (interval: IInterval) => void) => {
        const start = performance.now();

        let nextTick = start + INTERVAL;
        let end = nextTick + INTERVAL;

        const intervalId = setInterval(() => {
            if (performance.now() >= nextTick) {
                nextTick = end;
                end += INTERVAL;

                next({ end, start: nextTick });
            }
        }, INTERVAL / 10);

        next({ end, start });

        return <const>[() => performance.now(), () => clearInterval(intervalId)];
    };