"use strict";

function buildSlider(ref) {
  const skillblock = ref;
  let seen = false;
  return function(entry) {
    if (seen || !entry[0]?.isIntersecting) {
      return;
    }

    seen = true;
    const doNotAnimate = window.matchMedia("(prefers-reduced-motion: reduce)");
    let counter = 0;
    const interval = doNotAnimate ? (doNotAnimate.matches ? 0 : 75) : 0;
    for (var skill of skillblock.getElementsByClassName("skill-percentage")) {
      counter += 1;
      const self = skill;
      setTimeout(() => {
        self.style.width = `${self.getAttribute("data-width")}%`;
      }, counter * interval);
    }
  };
}

var initHandlers = function() {
  const skillblocks = document.getElementsByClassName("skill-block");
  for (const skillblock of Array.from(skillblocks)) {
    const observer = new IntersectionObserver(buildSlider(skillblock), { threshold: 0.1 });
    observer.observe(skillblock);
  }
};
window.addEventListener("load", initHandlers);