/**
 * Utils
 */

// Throttle
//
const throttle = (callback, limit) => {
  let timeoutHandler = null;
  return () => {
    if (timeoutHandler == null) {
      timeoutHandler = setTimeout(() => {
        callback();
        timeoutHandler = null;
      }, limit);
    }
  }
}

// addEventListener Helper
//
const listen = (ele, e, callback) => {
  if (document.querySelector(ele) !== null) {
    document.querySelector(ele).addEventListener(e, callback);
  }
}

/**
 * Functions
 */

// Set inner width into CSS variable
//
function setVw() {
  let vw = document.documentElement.clientWidth / 100;
  document.documentElement.style.setProperty('--vw', `${vw}px`);
}

setVw();
window.addEventListener('resize', setVw);


// ToC toggle
//
function toggleToc() {
  const toc = document.getElementById('toc');
  if (toc.style.display === 'block') {
    toc.style.display = 'none';
  } else {
    toc.style.display = 'block';
  }
}

listen ("#toc-btn", "click", toggleToc);

// Scroll to Top
//
const scrollBtn = document.getElementById('scroll-top-btn');
const btnVisibility = () => {
  if ((window.scrollY > 400) && (window.innerWidth >= 1590)) {
      scrollBtn.style.display = "block";
  } else {
      scrollBtn.style.display = "none";
  }
};

if (scrollBtn !== null) {
  scrollBtn.addEventListener("click", () => {
    window.scrollTo(0,0);
  });
}

// Anchor points for list page
//
document.querySelectorAll('.post-year').forEach((ele)=> {
  ele.addEventListener('click', () => {
    window.location.hash = '#' + ele.id;
  });
});

// Load Comments
//
let commentsLoaded = false;
let comments = document.getElementById('isso-thread');
let commentsLoader = document.getElementById('comments-loader');

const loadComments = () => {
  let script = document.createElement("script");
  script.setAttribute("type", "text/javascript");
  script.setAttribute("src", "/js/embed.min.js");

  // add relevant data-isso attributes here
  script.setAttribute("data-isso", "https://comment.ojbk.im");
  script.setAttribute("data-isso-vote", "false");
  // script.setAttribute("data-isso-max-comments-top", "10");
  // script.setAttribute("data-isso-reveal-on-click", "10");
  script.setAttribute("data-isso-css-url", "/css/isso.css");

  document.getElementsByTagName("head")[0].appendChild(script);
  commentsLoader.style.display = 'none';
}

// Load comments if the window is not scrollable
if ((comments !== null) && (comments.offsetTop < window.innerHeight)) {
  loadComments();
  commentsLoaded = true;
}

window.addEventListener('scroll', throttle(() => {
  if ((comments !== null) && (commentsLoaded == false)) {
    if (window.pageYOffset + window.innerHeight > comments.offsetTop) {
      loadComments();
      commentsLoaded = true;
    }
  }
  if (scrollBtn !== null) {
    btnVisibility();
  }
}, 150));