"use strict";
Object.defineProperty(exports, Symbol.toStringTag, { value: "Module" });
const utilities = require("../utilities.js");
/* @license
 * Copyright 2019 Google LLC. All Rights Reserved.
 * Licensed under the Apache License, Version 2.0 (the 'License');
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an 'AS IS' BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
const easeInOutQuad = (t) => t < 0.5 ? 2 * t * t : -1 + (4 - 2 * t) * t;
const interpolate = (start, end, ease = easeInOutQuad) => (time) => start + (end - start) * ease(time);
const sequence = (tracks, weights) => {
  const cumulativeSum = (sum) => (value) => sum += value;
  const times = weights.map(cumulativeSum(0));
  return (time) => {
    time = utilities.clamp(time, 0, 1);
    time *= times[times.length - 1];
    const i = times.findIndex((val) => val >= time);
    const start = i < 1 ? 0 : times[i - 1];
    const end = times[i];
    return tracks[i]((time - start) / (end - start));
  };
};
const timeline = (path) => {
  const tracks = [];
  const weights = [];
  let lastValue = path.initialValue;
  for (let i = 0; i < path.keyframes.length; ++i) {
    const keyframe = path.keyframes[i];
    const { value, frames } = keyframe;
    const ease = keyframe.ease || easeInOutQuad;
    const track = interpolate(lastValue, value, ease);
    tracks.push(track);
    weights.push(frames);
    lastValue = value;
  }
  return sequence(tracks, weights);
};
exports.easeInOutQuad = easeInOutQuad;
exports.interpolate = interpolate;
exports.sequence = sequence;
exports.timeline = timeline;
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