// Check for php server availability
async function checkPhpServer(username, password) {
  try {
    const response = await fetch('/app/server.check.php');
    if (!response.ok) throw new Error('No PHP server');
    const text = await response.text();
    if (text.trim() !== 'PHP_OK') throw new Error('PHP check failed');

    return true;
  } catch (error) {
    alert(`Sorry there is no PHP server running right now, here are your credentials btw:\nUsername: ${username}\nPassword: ${password}`);
    location.reload();
    return false;
  }
}

// Clear all inputs in the form when submitted
const form = document.querySelector("form");

form.addEventListener('submit', async (event) => {
  event.preventDefault();

  const username = form.elements['username'].value;
  const password = form.elements['password'].value;

  const phpIsRunning = await checkPhpServer(username, password);
  if (!phpIsRunning) return;

  form.submit();
});

document.addEventListener("DOMContentLoaded", () => {
  const usernameInput = document.getElementById("username");
  const passwordInput = document.getElementById("password");
  const loginButton = document.querySelector(".login-btn");
  const togglePassword = document.getElementById("togglePassword");
  const yearSpan = document.getElementById("current-year");
  const select = document.getElementById("language-select");
  const measureSpan = document.getElementById("language-measure");

  if (yearSpan) {
    yearSpan.textContent = new Date().getFullYear();
  }

  function validateInputs() {
    const username = usernameInput.value.trim();
    const password = passwordInput.value;

    loginButton.disabled = !(username !== "" && password.length > 8);

    // Show toggle button only if password is not empty
    if (password.length > 0) {
      togglePassword.style.display = "block";
    } else {
      togglePassword.style.display = "none";
      passwordInput.type = "password";
      togglePassword.textContent = "Show";
    }
  }

  function updateSelectWidth() {
    // Set the span's text to selected option
    const selectedText = select.options[select.selectedIndex].text;
    measureSpan.textContent = selectedText;

    // Get computed width and add padding for dropdown arrow
    const width = measureSpan.offsetWidth + 25;
    select.style.width = width + "px";
  }

  updateSelectWidth();

  select.addEventListener("change", updateSelectWidth);

  usernameInput.addEventListener("input", validateInputs);
  passwordInput.addEventListener("input", validateInputs);

  validateInputs();

  togglePassword.addEventListener("click", () => {
    const isPassword = passwordInput.type === "password";
    passwordInput.type = isPassword ? "text" : "password";
    togglePassword.textContent = isPassword ? "Hide" : "Show";
  });
});