User:CannonProductions/monacobookbeta.js

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/* User:CannonProductions/monacobookbeta.js
   - Shows optional "User JS RUNNING" badge (DEBUG_BADGE)
   - Dynamically scales #top-ad iframe banner to fit available width on mobile
*/

(function () {
  "use strict";

  // === SETTINGS ===
  var DEBUG_BADGE = false;          // set to false once you’ve confirmed scripts run
  var MOBILE_MAX_WIDTH = 720;      // only scale on screens <= this width
  var BASE_W = 468;                // banner’s native width
  var BASE_H = 60;                 // banner’s native height
  var MIN_SCALE = 0.55;            // don’t shrink below this (avoid ultra-tiny)
  var MAX_SCALE = 1.0;             // don’t upscale above 100%

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

  function addBadge() {
    if (!DEBUG_BADGE) return;
    if (!document.body) return;
    if (document.getElementById("js-test-badge")) return;

    var d = document.createElement("div");
    d.id = "js-test-badge";
    d.textContent = "User JS RUNNING";
    d.style.cssText =
      "position:fixed;top:0;left:0;z-index:999999;" +
      "padding:6px 10px;background:#e11;color:#fff;" +
      "font:12px sans-serif";
    document.body.prepend(d);
  }

  function isMobileWidth() {
    return window.matchMedia("(max-width: " + MOBILE_MAX_WIDTH + "px)").matches;
  }

  function resetBannerStyles(ad, iframe) {
    // Return things to normal if you rotate to desktop width
    if (ad) {
      ad.style.height = "";
      ad.style.overflow = "";
      ad.style.width = "";
    }
    if (iframe) {
      iframe.style.transform = "";
      iframe.style.transformOrigin = "";
      iframe.style.width = "";
      iframe.style.height = "";
      iframe.style.border = "";
      iframe.style.display = "";
    }
  }

  function rescaleBanner() {
    var ad = document.getElementById("top-ad");
    if (!ad) return;

    var iframe = ad.querySelector("iframe");
    if (!iframe) return;

    // Only do the scaling on mobile widths
    if (!isMobileWidth()) {
      resetBannerStyles(ad, iframe);
      return;
    }

    // Ensure predictable base sizing, then scale visually
    iframe.style.width = BASE_W + "px";
    iframe.style.height = BASE_H + "px";
    iframe.style.border = "0";
    iframe.style.display = "block";
    iframe.style.transformOrigin = "top left";

    // Available width = the ad container’s width (fallback to viewport)
    var available = ad.getBoundingClientRect().width || window.innerWidth;

    // Compute scale
    var scale = available / BASE_W;
    if (scale > MAX_SCALE) scale = MAX_SCALE;
    if (scale < MIN_SCALE) scale = MIN_SCALE;

    // Apply scale
    iframe.style.transform = "scale(" + scale.toFixed(4) + ")";

    // IMPORTANT: make the container’s layout height match scaled banner height
    ad.style.width = "100%";
    ad.style.overflow = "hidden";
    ad.style.height = (BASE_H * scale) + "px";
  }

  // Debounced resize handler (prevents it thrashing)
  var t = null;
  function scheduleRescale() {
    if (t) clearTimeout(t);
    t = setTimeout(rescaleBanner, 60);
  }

  function installObservers() {
    // Run now (in case #top-ad already exists)
    rescaleBanner();

    // Re-run on resize / rotate
    window.addEventListener("resize", scheduleRescale);
    window.addEventListener("orientationchange", scheduleRescale);

    // MediaWiki sometimes swaps content dynamically; hook if available
    if (window.mw && mw.hook) {
      mw.hook("wikipage.content").add(function () {
        scheduleRescale();
      });
    }

    // Watch for late insertion of #top-ad / iframe
    var obs = new MutationObserver(function () {
      scheduleRescale();
    });
    obs.observe(document.documentElement, { childList: true, subtree: true });
  }

  onReady(function () {
    addBadge();
    installObservers();
  });
})();