MatchLiveTv/backend/public/site-analytics.js

/*! Match Live TV first-party site analytics (click + mouse move + scroll). Requires analytics cookie consent. */
(function () {
  "use strict";

  var ENDPOINT = "/analytics/events";
  var STORAGE_KEY = "mltv_cookie_consent";
  var COOKIE_NAME = "mltv_cookie_consent";
  var FLUSH_MS = 6000;
  var MAX_QUEUE = 60;
  var MOVE_THROTTLE_MS = 180;
  var MOVE_GRID = 40;

  var queue = [];
  var moveBuckets = {};
  var maxScroll = 0;
  var flushTimer = null;
  var started = false;
  var lastMoveAt = 0;

  function excludedPath(pathname) {
    var p = pathname || "/";
    if (p.indexOf("/admin") === 0) return true;
    if (p.indexOf("/regia") === 0) return true;
    if (p.indexOf("/analytics") === 0) return true;
    if (/^\/live\/[^/]+/.test(p)) return true;
    if (/^\/replay\/[^/]+/.test(p)) return true;
    return false;
  }

  function hasAnalyticsConsent() {
    try {
      var raw = localStorage.getItem(STORAGE_KEY);
      if (raw) {
        var parsed = JSON.parse(raw);
        if (parsed && parsed.analytics) return true;
      }
    } catch (e) { /* ignore */ }
    var match = document.cookie.match(
      new RegExp("(?:^|; )" + COOKIE_NAME.replace(/[.*+?^${}()|[\]\\]/g, "\\$&") + "=([^;]*)")
    );
    return !!(match && decodeURIComponent(match[1]) === "all");
  }

  function deviceBucket() {
    var w = window.innerWidth || document.documentElement.clientWidth || 1024;
    if (w < 768) return "mobile";
    if (w < 1024) return "tablet";
    return "desktop";
  }

  function pageSize() {
    var doc = document.documentElement;
    var body = document.body;
    return {
      width: Math.max(body.scrollWidth || 0, doc.scrollWidth || 0, window.innerWidth || 1),
      height: Math.max(body.scrollHeight || 0, doc.scrollHeight || 0, window.innerHeight || 1)
    };
  }

  function scrollPct() {
    var doc = document.documentElement;
    var body = document.body;
    var scrollTop = window.pageYOffset || doc.scrollTop || body.scrollTop || 0;
    var height = Math.max(
      body.scrollHeight || 0,
      doc.scrollHeight || 0,
      body.offsetHeight || 0,
      doc.offsetHeight || 0,
      doc.clientHeight || 0
    );
    var view = window.innerHeight || doc.clientHeight || 0;
    var pct = ((scrollTop + view) / Math.max(height, 1)) * 100;
    if (scrollTop <= 0 && view >= height) return 100;
    return Math.max(0, Math.min(100, Math.round(pct)));
  }

  function pushEvent(evt) {
    if (!started) return;
    queue.push(evt);
    if (queue.length >= MAX_QUEUE) flush(false);
  }

  function flushMovesIntoQueue() {
    var keys = Object.keys(moveBuckets);
    if (!keys.length) return;
    var device = deviceBucket();
    var path = location.pathname;
    var ts = Date.now();
    keys.forEach(function (key) {
      var parts = key.split(",");
      var cx = parseInt(parts[0], 10);
      var cy = parseInt(parts[1], 10);
      var n = moveBuckets[key];
      if (!n) return;
      // cell center in %
      var x = ((cx + 0.5) / MOVE_GRID) * 100;
      var y = ((cy + 0.5) / MOVE_GRID) * 100;
      pushEvent({ type: "move", path: path, device: device, x: x, y: y, n: n, ts: ts });
    });
    moveBuckets = {};
  }

  function flush(useBeacon) {
    flushMovesIntoQueue();
    if (!queue.length || !hasAnalyticsConsent()) {
      queue = [];
      return;
    }
    var batch = queue.splice(0, MAX_QUEUE);
    var body = JSON.stringify({ events: batch });
    try {
      if (useBeacon && navigator.sendBeacon) {
        var blob = new Blob([body], { type: "application/json" });
        navigator.sendBeacon(ENDPOINT, blob);
        return;
      }
    } catch (e) { /* fall through */ }
    try {
      fetch(ENDPOINT, {
        method: "POST",
        headers: { "Content-Type": "application/json", Accept: "application/json" },
        body: body,
        keepalive: true,
        credentials: "same-origin"
      }).catch(function () { /* ignore */ });
    } catch (err) { /* ignore */ }
  }

  function trackPageview() {
    pushEvent({
      type: "pageview",
      path: location.pathname,
      device: deviceBucket(),
      ts: Date.now()
    });
  }

  function onClick(event) {
    var target = event.target;
    if (!(target instanceof Element)) return;
    if (target.closest("input, textarea, select, [contenteditable='true']")) return;

    var size = pageSize();
    var x = event.pageX;
    var y = event.pageY;
    if (typeof x !== "number" || typeof y !== "number") return;

    pushEvent({
      type: "click",
      path: location.pathname,
      device: deviceBucket(),
      x: Math.max(0, Math.min(100, (x / size.width) * 100)),
      y: Math.max(0, Math.min(100, (y / size.height) * 100)),
      ts: Date.now()
    });
  }

  function onMouseMove(event) {
    var now = Date.now();
    if (now - lastMoveAt < MOVE_THROTTLE_MS) return;
    lastMoveAt = now;
    var size = pageSize();
    var x = event.pageX;
    var y = event.pageY;
    if (typeof x !== "number" || typeof y !== "number") return;
    var xPct = Math.max(0, Math.min(100, (x / size.width) * 100));
    var yPct = Math.max(0, Math.min(100, (y / size.height) * 100));
    var cx = Math.min(MOVE_GRID - 1, Math.max(0, Math.floor((xPct / 100) * MOVE_GRID)));
    var cy = Math.min(MOVE_GRID - 1, Math.max(0, Math.floor((yPct / 100) * MOVE_GRID)));
    var key = cx + "," + cy;
    moveBuckets[key] = (moveBuckets[key] || 0) + 1;
  }

  function onScroll() {
    var pct = scrollPct();
    if (pct > maxScroll) maxScroll = pct;
  }

  function flushScroll() {
    if (maxScroll <= 0) return;
    pushEvent({
      type: "scroll",
      path: location.pathname,
      device: deviceBucket(),
      scroll: maxScroll,
      ts: Date.now()
    });
  }

  function scheduleFlush() {
    if (flushTimer) return;
    flushTimer = setInterval(function () {
      flushScroll();
      flush(false);
    }, FLUSH_MS);
  }

  function start() {
    if (started) return;
    if (excludedPath(location.pathname)) return;
    if (!hasAnalyticsConsent()) return;
    started = true;
    maxScroll = scrollPct();
    trackPageview();
    document.addEventListener("click", onClick, true);
    document.addEventListener("mousemove", onMouseMove, { passive: true });
    window.addEventListener("scroll", onScroll, { passive: true });
    document.addEventListener("visibilitychange", function () {
      if (document.visibilityState === "hidden") {
        flushScroll();
        flush(true);
      }
    });
    window.addEventListener("pagehide", function () {
      flushScroll();
      flush(true);
    });
    scheduleFlush();
  }

  window.mltvSiteAnalyticsStart = start;

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