// GoatCounter: https://www.goatcounter.com
// This file is released under the ISC license: https://opensource.org/licenses/ISC
(function () {
  "use strict";

  if (window.goatcounter && window.goatcounter.vars)
    // Compatibility with very old version; do not use.
    window.goatcounter = window.goatcounter.vars;
  else window.goatcounter = window.goatcounter || {};

  // Load settings from data-goatcounter-settings.
  var s = document.querySelector("script[data-goatcounter]");
  if (s && s.dataset.goatcounterSettings) {
    try {
      var set = JSON.parse(s.dataset.goatcounterSettings);
    } catch (err) {
      console.error("invalid JSON in data-goatcounter-settings: " + err);
    }
    for (var k in set)
      if (
        [
          "no_onload",
          "no_events",
          "allow_local",
          "allow_frame",
          "path",
          "title",
          "referrer",
          "event",
        ].indexOf(k) > -1
      )
        window.goatcounter[k] = set[k];
  }

  var enc = encodeURIComponent;

  // Get all data we're going to send off to the counter endpoint.
  var get_data = function (vars) {
    var data = {
      p: vars.path === undefined ? goatcounter.path : vars.path,
      r: vars.referrer === undefined ? goatcounter.referrer : vars.referrer,
      t: vars.title === undefined ? goatcounter.title : vars.title,
      e: !!(vars.event || goatcounter.event),
      s: [
        window.screen.width,
        window.screen.height,
        window.devicePixelRatio || 1,
      ],
      b: is_bot(),
      q: location.search,
    };

    var rcb, pcb, tcb; // Save callbacks to apply later.
    if (typeof data.r === "function") rcb = data.r;
    if (typeof data.t === "function") tcb = data.t;
    if (typeof data.p === "function") pcb = data.p;

    if (is_empty(data.r)) data.r = document.referrer;
    if (is_empty(data.t)) data.t = document.title;
    if (is_empty(data.p)) data.p = get_path();

    if (rcb) data.r = rcb(data.r);
    if (tcb) data.t = tcb(data.t);
    if (pcb) data.p = pcb(data.p);
    return data;
  };

  // Check if a value is "empty" for the purpose of get_data().
  var is_empty = function (v) {
    return v === null || v === undefined || typeof v === "function";
  };

  // See if this looks like a bot; there is some additional filtering on the
  // backend, but these properties can't be fetched from there.
  var is_bot = function () {
    // Headless browsers are probably a bot.
    var w = window,
      d = document;
    if (w.callPhantom || w._phantom || w.phantom) return 150;
    if (w.__nightmare) return 151;
    if (d.__selenium_unwrapped || d.__webdriver_evaluate || d.__driver_evaluate)
      return 152;
    if (navigator.webdriver) return 153;
    return 0;
  };

  // Object to urlencoded string, starting with a ?.
  var urlencode = function (obj) {
    var p = [];
    for (var k in obj)
      if (
        obj[k] !== "" &&
        obj[k] !== null &&
        obj[k] !== undefined &&
        obj[k] !== false
      )
        p.push(enc(k) + "=" + enc(obj[k]));
    return "?" + p.join("&");
  };

  // Show a warning in the console.
  var warn = function (msg) {
    if (console && "warn" in console) console.warn("goatcounter: " + msg);
  };

  // Get the endpoint to send requests to.
  var get_endpoint = function () {
    var s = document.querySelector("script[data-goatcounter]");
    if (s && s.dataset.goatcounter) return s.dataset.goatcounter;
    return goatcounter.endpoint || window.counter; // counter is for compat; don't use.
  };

  // Get current path.
  var get_path = function () {
    var loc = location,
      c = document.querySelector('link[rel="canonical"][href]');
    if (c) {
      // May be relative or point to different domain.
      var a = document.createElement("a");
      a.href = c.href;
      if (
        a.hostname.replace(/^www\./, "") ===
        location.hostname.replace(/^www\./, "")
      )
        loc = a;
    }
    return loc.pathname + loc.search || "/";
  };

  // Run function after DOM is loaded.
  var on_load = function (f) {
    if (document.body === null)
      document.addEventListener(
        "DOMContentLoaded",
        function () {
          f();
        },
        false
      );
    else f();
  };

  // Filter some requests that we (probably) don't want to count.
  goatcounter.filter = function () {
    if (
      "visibilityState" in document &&
      document.visibilityState === "prerender"
    )
      return "visibilityState";
    if (!goatcounter.allow_frame && location !== parent.location)
      return "frame";
    if (
      !goatcounter.allow_local &&
      location.hostname.match(
        /(localhost$|^127\.|^10\.|^172\.(1[6-9]|2[0-9]|3[0-1])\.|^192\.168\.|^0\.0\.0\.0$)/
      )
    )
      return "localhost";
    if (!goatcounter.allow_local && location.protocol === "file:")
      return "localfile";
    if (localStorage && localStorage.getItem("skipgc") === "t")
      return "disabled with #toggle-goatcounter";
    return false;
  };

  // Get URL to send to GoatCounter.
  window.goatcounter.url = function (vars) {
    var data = get_data(vars || {});
    if (data.p === null)
      // null from user callback.
      return;
    data.rnd = Math.random().toString(36).substr(2, 5); // Browsers don't always listen to Cache-Control.

    var endpoint = get_endpoint();
    if (!endpoint) return warn("no endpoint found");

    return endpoint + urlencode(data);
  };

  // Count a hit.
  window.goatcounter.count = function (vars) {
    var f = goatcounter.filter();
    if (f) return warn("not counting because of: " + f);
    var url = goatcounter.url(vars);
    if (!url) return warn("not counting because path callback returned null");

    if (!navigator.sendBeacon(url)) {
      // This mostly fails due to being blocked by CSP; try again with an
      // image-based fallback.
      var img = document.createElement("img");
      img.src = url;
      img.style.position = "absolute"; // Affect layout less.
      img.style.bottom = "0px";
      img.style.width = "1px";
      img.style.height = "1px";
      img.loading = "eager";
      img.setAttribute("alt", "");
      img.setAttribute("aria-hidden", "true");

      var rm = function () {
        if (img && img.parentNode) img.parentNode.removeChild(img);
      };
      img.addEventListener("load", rm, false);
      document.body.appendChild(img);
    }
  };

  // Get a query parameter.
  window.goatcounter.get_query = function (name) {
    var s = location.search.substr(1).split("&");
    for (var i = 0; i < s.length; i++)
      if (s[i].toLowerCase().indexOf(name.toLowerCase() + "=") === 0)
        return s[i].substr(name.length + 1);
  };

  // Track click events.
  window.goatcounter.bind_events = function () {
    if (!document.querySelectorAll)
      // Just in case someone uses an ancient browser.
      return;

    var send = function (elem) {
      return function () {
        goatcounter.count({
          event: true,
          path: elem.dataset.goatcounterClick || elem.name || elem.id || "",
          title:
            elem.dataset.goatcounterTitle ||
            elem.title ||
            (elem.innerHTML || "").substr(0, 200) ||
            "",
          referrer:
            elem.dataset.goatcounterReferrer ||
            elem.dataset.goatcounterReferral ||
            "",
        });
      };
    };

    Array.prototype.slice
      .call(document.querySelectorAll("*[data-goatcounter-click]"))
      .forEach(function (elem) {
        if (elem.dataset.goatcounterBound) return;
        var f = send(elem);
        elem.addEventListener("click", f, false);
        elem.addEventListener("auxclick", f, false); // Middle click.
        elem.dataset.goatcounterBound = "true";
      });
  };

  // Add a "visitor counter" frame or image.
  window.goatcounter.visit_count = function (opt) {
    on_load(function () {
      opt = opt || {};
      opt.type = opt.type || "html";
      opt.append = opt.append || "body";
      opt.path = opt.path || get_path();
      opt.attr = opt.attr || {
        width: "200",
        height: opt.no_branding ? "60" : "80",
      };

      opt.attr["src"] =
        get_endpoint() + "er/" + enc(opt.path) + "." + enc(opt.type) + "?";
      if (opt.no_branding) opt.attr["src"] += "&no_branding=1";
      if (opt.style) opt.attr["src"] += "&style=" + enc(opt.style);
      if (opt.start) opt.attr["src"] += "&start=" + enc(opt.start);
      if (opt.end) opt.attr["src"] += "&end=" + enc(opt.end);

      var tag = { png: "img", svg: "img", html: "iframe" }[opt.type];
      if (!tag) return warn("visit_count: unknown type: " + opt.type);

      if (opt.type === "html") {
        opt.attr["frameborder"] = "0";
        opt.attr["scrolling"] = "no";
      }

      var d = document.createElement(tag);
      for (var k in opt.attr) d.setAttribute(k, opt.attr[k]);

      var p = document.querySelector(opt.append);
      if (!p) return warn("visit_count: append not found: " + opt.append);
      p.appendChild(d);
    });
  };

  // Make it easy to skip your own views.
  if (location.hash === "#toggle-goatcounter") {
    if (localStorage.getItem("skipgc") === "t") {
      localStorage.removeItem("skipgc", "t");
      alert("GoatCounter tracking is now ENABLED in this browser.");
    } else {
      localStorage.setItem("skipgc", "t");
      alert(
        "GoatCounter tracking is now DISABLED in this browser until " +
          location +
          " is loaded again."
      );
    }
  }

  if (!goatcounter.no_onload)
    on_load(function () {
      // 1. Page is visible, count request.
      // 2. Page is not yet visible; wait until it switches to 'visible' and count.
      // See #487
      if (
        !("visibilityState" in document) ||
        document.visibilityState === "visible"
      )
        goatcounter.count();
      else {
        var f = function (e) {
          if (document.visibilityState !== "visible") return;
          document.removeEventListener("visibilitychange", f);
          goatcounter.count();
        };
        document.addEventListener("visibilitychange", f);
      }

      if (!goatcounter.no_events) goatcounter.bind_events();
    });
})();