import { type EasingFunction } from '../types';

type EasingFunc = (t: number) => number;

/**
 * 이징 함수 구현 맵
 */
const easingFunctions: Record<EasingFunction, EasingFunc> = {
  linear: (t) => t,

  easeIn: (t) => t * t,
  easeOut: (t) => t * (2 - t),
  easeInOut: (t) => (t < 0.5 ? 2 * t * t : -1 + (4 - 2 * t) * t),

  easeInQuad: (t) => t * t,
  easeOutQuad: (t) => t * (2 - t),

  easeInCubic: (t) => t * t * t,
  easeOutCubic: (t) => 1 - Math.pow(1 - t, 3),
};

/**
 * 진행도에 이징 함수를 적용
 * @param progress 진행도 (0.0 - 1.0)
 * @param easingType 적용할 이징 함수 타입
 * @returns 이징이 적용된 진행도 (0.0 - 1.0)
 */
export const applyEasing = (
  progress: number,
  easingType: EasingFunction
): number => {
  const clampedProgress = Math.max(0, Math.min(1, progress));
  return easingFunctions[easingType](clampedProgress);
};