(function () {
  let settings = DEFAULT_SETTINGS;
  const elementState = new WeakMap();
  const CLICK_COOLDOWN_MS = 1500;

  function isSkipIntroButton(text) {
    return text.indexOf("skip intro") !== -1;
  }

  function isSkipCreditsButton(text) {
    return text.indexOf("skip credit") !== -1;
  }

  function isVisible(el) {
    const style = window.getComputedStyle(el);
    return style.display !== "none" && style.visibility !== "hidden" && style.opacity !== "0";
  }

  function getDelayMs(type) {
    const seconds = type === "intro" ? settings.introDelaySeconds : settings.creditsDelaySeconds;
    return clampDelaySeconds(seconds) * 1000;
  }

  function isStillEligible(el, type) {
    if (!document.body.contains(el)) return false;
    if (!isVisible(el)) return false;
    if (type === "intro" && !settings.skipIntro) return false;
    if (type === "credits" && !settings.skipCredits) return false;
    if (!hostMatchesConfig(window.location.hostname, settings.plexUrl)) return false;

    const text = (el.innerText || el.textContent || "").trim().toLowerCase();
    return type === "intro" ? isSkipIntroButton(text) : isSkipCreditsButton(text);
  }

  function performClick(el) {
    const state = elementState.get(el) || {};
    state.timer = null;
    state.lastClickAt = Date.now();
    elementState.set(el, state);
    el.click();
  }

  function scheduleClick(el, type) {
    const state = elementState.get(el) || {};
    if (state.timer) return;
    if (state.lastClickAt && Date.now() - state.lastClickAt < CLICK_COOLDOWN_MS) return;

    const delayMs = getDelayMs(type);
    if (delayMs <= 0) {
      performClick(el);
      return;
    }

    state.timer = setTimeout(() => {
      const current = elementState.get(el) || {};
      current.timer = null;
      elementState.set(el, current);
      if (isStillEligible(el, type)) performClick(el);
    }, delayMs);
    elementState.set(el, state);
  }

  function scanAndClick() {
    if (!settings.skipIntro && !settings.skipCredits) return;
    if (!hostMatchesConfig(window.location.hostname, settings.plexUrl)) return;

    const nodes = document.querySelectorAll('button, [role="button"]');
    nodes.forEach((el) => {
      const text = (el.innerText || el.textContent || "").trim().toLowerCase();
      if (!text) return;
      if (!isVisible(el)) return;

      if (settings.skipIntro && isSkipIntroButton(text)) {
        scheduleClick(el, "intro");
      } else if (settings.skipCredits && isSkipCreditsButton(text)) {
        scheduleClick(el, "credits");
      }
    });
  }

  function start() {
    const observer = new MutationObserver(scanAndClick);
    observer.observe(document.documentElement, { childList: true, subtree: true });
    scanAndClick();
  }

  chrome.storage.sync.get(DEFAULT_SETTINGS, (loaded) => {
    settings = loaded;
    start();
  });

  chrome.storage.onChanged.addListener((changes, area) => {
    if (area !== "sync") return;
    Object.keys(changes).forEach((key) => {
      settings[key] = changes[key].newValue;
    });
  });
})();