script.js

const inputBox = document.getElementById("input-box");
const listContainer = document.getElementById("list-container");

function addTask(){
    if(inputBox.value === ''){
        alert("You must write something!")
    }
    else{
        let li = document.createElement("li")
        li.innerHTML = inputBox.value; 
        listContainer.appendChild(li);
        let span = document.createElement("span");
        span.innerHTML = "\u00d7";
        li.appendChild(span);
    }
    inputBox.value = "";
    saveData();
}

listContainer.addEventListener("click", function(e){
    if(e.target.tagName === "LI"){
        if (!e.target.classList.contains("unchecked") &&
            !e.target.classList.contains("in-progress") &&
            !e.target.classList.contains("checked")) {
            // Démarrage = tâche sans classe → on passe à "unchecked"
            e.target.classList.add("in-progress");
        } 
        else if (e.target.classList.contains("unchecked")) {
            e.target.classList.remove("unchecked");
            e.target.classList.add("in-progress");
        } 
        else if (e.target.classList.contains("in-progress")) {
            e.target.classList.remove("in-progress");
            e.target.classList.add("checked");
        } 
        else if (e.target.classList.contains("checked")) {
            e.target.classList.remove("checked");
            e.target.classList.add("unchecked");
        }
        saveData();
    }
    else if(e.target.tagName === "SPAN"){
        e.target.parentElement.remove();
        saveData();
    }
}, false);

function saveData(){
    localStorage.setItem("data", listContainer.innerHTML);
}

function showTask(){
    listContainer.innerHTML = localStorage.getItem("data");
}

document.getElementById("input-box").addEventListener("keydown", function(event) {
  if (event.key === "Enter") {
    addTask();
  }
});

showTask();