"use strict";
Object.defineProperty(exports, Symbol.toStringTag, { value: "Module" });
const index = require("./dist-es-animation-generators-spring-index.cjs");
const velocity = require("./dist-es-animation-generators-utils-velocity.cjs");
function inertia({ keyframes, velocity: velocity$1 = 0, power = 0.8, timeConstant = 325, bounceDamping = 10, bounceStiffness = 500, modifyTarget, min, max, restDelta = 0.5, restSpeed }) {
  const origin = keyframes[0];
  const state = {
    done: false,
    value: origin
  };
  const isOutOfBounds = (v) => min !== void 0 && v < min || max !== void 0 && v > max;
  const nearestBoundary = (v) => {
    if (min === void 0)
      return max;
    if (max === void 0)
      return min;
    return Math.abs(min - v) < Math.abs(max - v) ? min : max;
  };
  let amplitude = power * velocity$1;
  const ideal = origin + amplitude;
  const target = modifyTarget === void 0 ? ideal : modifyTarget(ideal);
  if (target !== ideal)
    amplitude = target - origin;
  const calcDelta = (t) => -amplitude * Math.exp(-t / timeConstant);
  const calcLatest = (t) => target + calcDelta(t);
  const applyFriction = (t) => {
    const delta = calcDelta(t);
    const latest = calcLatest(t);
    state.done = Math.abs(delta) <= restDelta;
    state.value = state.done ? target : latest;
  };
  let timeReachedBoundary;
  let spring$1;
  const checkCatchBoundary = (t) => {
    if (!isOutOfBounds(state.value))
      return;
    timeReachedBoundary = t;
    spring$1 = index.spring({
      keyframes: [state.value, nearestBoundary(state.value)],
      velocity: velocity.calcGeneratorVelocity(calcLatest, t, state.value),
      // TODO: This should be passing * 1000
      damping: bounceDamping,
      stiffness: bounceStiffness,
      restDelta,
      restSpeed
    });
  };
  checkCatchBoundary(0);
  return {
    calculatedDuration: null,
    next: (t) => {
      let hasUpdatedFrame = false;
      if (!spring$1 && timeReachedBoundary === void 0) {
        hasUpdatedFrame = true;
        applyFriction(t);
        checkCatchBoundary(t);
      }
      if (timeReachedBoundary !== void 0 && t >= timeReachedBoundary) {
        return spring$1.next(t - timeReachedBoundary);
      } else {
        !hasUpdatedFrame && applyFriction(t);
        return state;
      }
    }
  };
}
exports.inertia = inertia;
//# sourceMappingURL=dist-es-animation-generators-inertia.cjs.map
