document.addEventListener("DOMContentLoaded", function () {
  const tweetForm = document.getElementById("tweetForm");

  const usernameError = document.getElementById("usernameError");
  const tweetError = document.getElementById("tweetError");

  usernameError.style.display = "none";
  tweetError.style.display = "none";

  tweetForm.addEventListener("submit", function (event) {
    const usernameInput = document.getElementById("username");
    const tweetTextarea = document.getElementById("tweet");

    let isValid = true;

    if (!usernameInput.value.trim()) {
      usernameError.style.display = "block";
      isValid = false;
    } else {
      usernameError.style.display = "none";
    }

    if (!tweetTextarea.value.trim()) {
      tweetError.style.display = "block";
      isValid = false;
    } else {
      tweetError.style.display = "none";
    }

    if (!isValid) {
      event.preventDefault(); // zatrzymuje wysłanie formularza
    }
  });
});