const CACHE_KEY = "hypermind-version-check";
const CACHE_DURATION = 86400000;

const getCurrentVersion = () => {
  return document.body.dataset.version || "no-version";
};

const isNewer = (latest, current) => {
  if (current === "no-version") return true;

  const l = latest.split(".").map(Number);
  const c = current.split(".").map(Number);

  for (let i = 0; i < 3; i++) {
    if (l[i] > (c[i] || 0)) return true;
    if (l[i] < (c[i] || 0)) return false;
  }
  return false;
};

const checkForNewVersion = async () => {
  try {
    const cached = localStorage.getItem(CACHE_KEY);
    if (cached) {
      try {
        const parsedCache = JSON.parse(cached);
        const now = Date.now();

        if (now - parsedCache.timestamp < CACHE_DURATION) {
          if (parsedCache.data) {
            showVersionNotification(parsedCache.data);
          }
          return;
        }
      } catch (e) {
        localStorage.removeItem(CACHE_KEY);
      }
    }

    const response = await fetch("/api/github/latest-release");
    if (!response.ok) return;

    const release = await response.json();

    const cacheData = {
      data: release,
      timestamp: Date.now(),
    };
    localStorage.setItem(CACHE_KEY, JSON.stringify(cacheData));

    showVersionNotification(release);
  } catch (error) {
    console.error("Error checking for new version:", error);
  }
};

const showVersionNotification = (release) => {
  if (!release || !release.tag_name) return;

  const latestVersion = release.tag_name.replace(/^v/, "");
  const currentVersion = getCurrentVersion();

  if (!isNewer(latestVersion, currentVersion)) return;

  const dismissedKey = `hypermind-version-dismissed-${release.tag_name}`;
  if (localStorage.getItem(dismissedKey) === "true") return;

  const banner = document.getElementById("version-notification");
  if (!banner) return;

  const versionText = banner.querySelector(".version-text");
  const updateLink = banner.querySelector(".update-link");
  const dismissBtn = banner.querySelector(".dismiss-btn");

  versionText.textContent = `New version ${release.tag_name} available!`;
  updateLink.href = release.html_url;

  dismissBtn.onclick = () => {
    banner.classList.remove("active");
    localStorage.setItem(dismissedKey, "true");
  };

  setTimeout(() => {
    banner.classList.add("active");
  }, 1000);
};

if (document.readyState === "loading") {
  document.addEventListener("DOMContentLoaded", checkForNewVersion);
} else {
  checkForNewVersion();
}