import Lenis from 'lenis';
import { ScrollTrigger } from 'gsap/ScrollTrigger';

let lenis: Lenis | null = null;

export function initLenis(): Lenis {
  if (lenis) return lenis;
  lenis = new Lenis({
    duration: 1.2,
    easing: (t: number) => Math.min(1, 1.001 - Math.pow(2, -10 * t)),
    orientation: 'vertical',
    gestureOrientation: 'vertical',
    smoothWheel: true,
    wheelMultiplier: 1,
    touchMultiplier: 2,
  });

  lenis.on('scroll', ScrollTrigger.update);

  gsap.ticker.lagSmoothing(0);
  gsap.ticker.add((time: number) => {
    lenis?.raf(time * 1000);
  });

  return lenis;
}

export function destroyLenis(): void {
  if (lenis) {
    lenis.destroy();
    lenis = null;
  }
}

export { Lenis };