function hide(element) {
  element.classList.add("hidden");
}
function unhide(element) {
  element.classList.remove("hidden");
}

function toggle_all_header_links() {
  const headerLinks = document.querySelector("header > .links");
  const button_link = document.querySelector("header > button");
  headerLinks.classList.toggle("display_links");
  button_link.textContent = headerLinks.classList.contains("display_links")
    ? "▲"
    : "▼";
}

function validate() {
  let fname = document.getElementById("fname").value.trim();
  let lname = document.getElementById("lname").value.trim();
  let birth = document.getElementById("birth").value.trim();
  let email = document.getElementById("email").value.trim();
  let phone = document.getElementById("phone").value.trim();
  let mcCreator = document.querySelector("input[name='mc_creator']:checked");
  let worth = document.getElementById("worth").value.trim();

  let emailPattern = /^[^\s@]+@[^\s@]+\.[^\s@]+$/;
  let phonePattern = /^\+?[0-9]{7,15}$/;
  let birthPattern = /^(\d{4})-(\d{2})-(\d{2})$/; // Format YYYY-MM-DD

  if (fname === "" || lname === "") {
    alert("First name and last name are required.");
    return;
  }

  if (!birthPattern.test(birth)) {
    alert("Please enter a valid birthdate in YYYY-MM-DD format.");
    return;
  }

  if (!emailPattern.test(email)) {
    alert("Please enter a valid email address.");
    return;
  }

  if (!phonePattern.test(phone)) {
    alert("Please enter a valid phone number.");
    return;
  }

  if (!mcCreator) {
    alert("Please select the creator of Minecraft.");
    return;
  }

  if (worth === "" || isNaN(worth) || worth < 0) {
    alert("Please enter a valid worth in euros.");
    return;
  }
  calculateScore();
}
function calculateScore() {
  let score = 0;
  let os = document.getElementById("os-select").value;
  let mcCreator = document.querySelector(
    "input[name='mc_creator']:checked",
  ).value;
  let voca = document.getElementById("voca").value.trim().toLowerCase();
  let worth = parseFloat(document.getElementById("worth").value);
  let sns = document.getElementById("sns-select").value;

  if (os === "linux") score += 1;
  if (mcCreator === "miku") score += 1;
  if (voca === "electric angel") score += 1;
  if (worth > 5000000) score += 1;
  if (sns === "Twitter") score += 1;

  alert("Your score is: " + score + "/5");
}