// Authentication helper functions
async function getCurrentUser() {
  try {
    const response = await fetch("/api/user/me", {
      credentials: "include",
    });

    if (response.ok) {
      return await response.json();
    }
    return null;
  } catch (error) {
    console.error("Error fetching current user:", error);
    return null;
  }
}

// Auto-login check
async function checkAuth() {
  const user = await getCurrentUser();

  // List of pages that do NOT require authentication
  const publicPages = ["/", "/index.html", "/login.html"];

  // If user is NOT logged in AND we are NOT on a public page
  if (!user && !publicPages.includes(window.location.pathname)) {
    // Redirect immediately to the Sign In page
    window.location.href = "/login.html";
    return null;
  }

  return user;
}

// Redirect to dashboard if already logged in (for login.html and index.html)
async function redirectIfLoggedIn() {
  const user = await getCurrentUser();
  if (user) {
    window.location.href = "/dashboard.html";
  }
}

// Logout function
function logout() {
  document.cookie =
    "browser_id=; path=/; expires=Thu, 01 Jan 1970 00:00:00 GMT";
  window.location.href = "/login.html";
}

// Extract path parts for display
function formatFullPath(fullPath) {
  return fullPath.replace(/<>/g, " - ");
}

// Parse full_path to extract parts (semester<>faculty<>field)
function parseFullPath(fullPath) {
  const parts = fullPath.split("<>");
  return {
    semester: parts[0] || "",
    faculty: parts[1] || "",
    field: parts[2] || "",
  };
}

// Check subscription status
async function checkSubscription(userId, fullPath) {
  try {
    const response = await fetch(
      `/api/subscription/check/${userId}/${encodeURIComponent(fullPath)}`,
      {
        credentials: "include",
      },
    );
    const data = await response.json();
    return data.subscribed;
  } catch (error) {
    console.error("Error checking subscription:", error);
    return false;
  }
}

// WhatsApp redirect
function redirectToWhatsApp(phone, fullPath) {
  const message = `Hello, I would like to activate access to: ${fullPath}`;
  const url = `https://wa.me/${phone}?text=${encodeURIComponent(message)}`;
  window.open(url, "_blank");
}