<script src="https://cdnjs.cloudflare.com/ajax/libs/gsap/3.5.1/gsap.min.js"></script>
<script src="https://cdnjs.cloudflare.com/ajax/libs/gsap/3.5.1/ScrollTrigger.min.js"></script>

<script>
document.addEventListener("DOMContentLoaded", function() {
function getSelectedText(){
if (window.getSelection)
return window.getSelection().toString()+"<br/>"+document.URL;
else if (document.selection)
return document.selection.createRange().text+"<br/>"+document.URL;
}

var toc=document.getElementById("TOC"); //Mettre div TOC ou créer dynamiquement
if(!toc) {
 toc=document.createElement("div");
 toc.id="TOC";
 document.body.insertBefore(toc, document.body.firstChild);
}
var headings;
//if (document.querySelectorAll) 
//headings=document.querySelectorAll("h1, h2, h3, h4, h5, h6");
//headings=document.querySelectorAll("h2, h3, h4, h5, h6"); // Ne pas récupérer le titre principal
//else
headings=findHeadings(document.querySelector(".post-content"), []); // Modifier body -> post-content

function findHeadings(root, sects){
 for(var c=root.firstChild; c!=null; c=c.nextSibling){
if (c.nodeType!==1) continue;
if (c.tagName.length==2 && c.tagName.charAt(0)=="H")
sects.push(c);
else
findHeadings(c, sects);
}
return sects;
}

var sectionNumbers=[0,0,0,0,0,0];
  
for(var h=0; h<headings.length; h++) {
var heading=headings[h];

if(heading.parentNode==toc) continue;

var level=parseInt(heading.tagName.charAt(1));
if (isNaN(level)||level<1||level>6) continue;

sectionNumbers[level-1]++;
for(var i=level; i<6; i++) sectionNumbers[i]=0;

var sectionNumber=sectionNumbers.slice(0, level).join(".");
  
var span=document.createElement("span");
span.className="TOCSectNum";
span.innerHTML=sectionNumber;
heading.insertBefore(span, heading.firstChild);
heading.id="TOC"+sectionNumber;
  
var anchor=document.createElement("a");
heading.parentNode.insertBefore(anchor, heading);
anchor.appendChild(heading);
anchor.classList.add("titre");   // ajout classe

var link=document.createElement("a");
link.href="#TOC"+sectionNumber; 
link.innerHTML=heading.innerHTML;
link.classList.add("lien"); // ajout classe

var entry=document.createElement("div");
entry.className="TOCEntry TOCLevel" + level;
entry.appendChild(link);

toc.appendChild(entry);
}
  
gsap.registerPlugin(ScrollTrigger);

  // visible when sticky
const stick = document.querySelector('.sticky');
ScrollTrigger.create({
trigger: ".scrollcontent",
start: "top 10%",
//markers: true,
onEnter: () => stick.classList.add("visible"),
onLeaveBack: () => stick.classList.remove("visible")
});
  
  // Scroll vertical de la ligne  
gsap.from(".vscroll", {
  scrollTrigger: {
    trigger: ".scrollcontent",
    scrub: true,
    start: "top top",
    end: "bottom 98%"
    //markers: true
  },
  scaleY: 0, 
  transformOrigin: "top center", 
  ease: "none"
});  
  
  // Actif à 100% du scroll vertical  
const icone = document.querySelector('.post-icon');
ScrollTrigger.create({
trigger: ".scrollcontent",
start: "bottom bottom",
onEnter: () => icone.classList.add("active"),
onLeaveBack: () => icone.classList.remove("active")
});
 
  // rechercher les liens dans la TOC 
var liens = document.getElementsByClassName("lien");  
var titres = document.getElementsByClassName("titre");
  
function get_end($i){
  var trigger;
  $trigger = titres[$i+1].offsetTop - titres[$i].offsetTop;
  
  return $trigger;
}

gsap.utils.toArray(".titre").forEach((panel, i) => {

  ScrollTrigger.create({
    trigger: panel,
    start: "top 20%",
    end: get_end(i) + " 20%",
    //markers: true,
    onEnter: () => liens[i].classList.add("engras"),
    onLeave: () => liens[i].classList.remove("engras"),
    onEnterBack: () => liens[i].classList.add("engras"),
    onLeaveBack: () => liens[i].classList.remove("engras")
  });
});

});
</script>