/* globals chromeWindow */

/* eslint-disable mozilla/no-comparison-or-assignment-inside-ok */

// The main test function.
var test = function (isContent) {
  SimpleTest.waitForExplicitFinish();

  SpecialPowers.pushPrefEnv({
    set: [["security.allow_eval_with_system_principal", true]],
  });

  if (!isContent) {
    let { ww } = SpecialPowers.Services;
    window.chromeWindow = ww.activeWindow;
  }

  // The pairs of values expected to be the same when
  // fingerprinting resistance is enabled.
  let pairs = [
    ["screenX", 0],
    ["screenY", 0],
    ["mozInnerScreenX", 0],
    ["mozInnerScreenY", 0],
    ["screen.pixelDepth", 24],
    ["screen.colorDepth", 24],
    ["screen.availWidth", "innerWidth"],
    ["screen.availHeight", "innerHeight"],
    ["screen.left", 0],
    ["screen.top", 0],
    ["screen.availLeft", 0],
    ["screen.availTop", 0],
    ["screen.width", "innerWidth"],
    ["screen.height", "innerHeight"],
    ["screen.orientation.type", "'landscape-primary'"],
    ["screen.orientation.angle", 0],
    ["screen.mozOrientation", "'landscape-primary'"],
    ["devicePixelRatio", 2],
  ];

  // checkPair: tests if members of pair [a, b] are equal when evaluated.
  let checkPair = function (a, b) {
    // eslint-disable-next-line no-eval
    is(eval(a), eval(b), a + " should be equal to " + b);
  };

  // Returns generator object that iterates through pref values.
  let prefVals = (function* () {
    yield false;
    yield true;
  })();

  // The main test function, runs until all pref values are exhausted.
  let nextTest = function () {
    let { value: prefValue, done } = prefVals.next();
    if (done) {
      SimpleTest.finish();
      return;
    }
    SpecialPowers.pushPrefEnv(
      { set: [["privacy.resistFingerprinting", prefValue]] },
      function () {
        // We will be resisting fingerprinting if the pref is enabled,
        // and we are in a content script (not chrome).
        let resisting = prefValue && isContent;
        // Check each of the pairs.
        pairs.map(function ([item, onVal]) {
          if (resisting) {
            checkPair("window." + item, onVal);
          } else if (!isContent && !item.startsWith("moz")) {
            checkPair("window." + item, "chromeWindow." + item);
          }
        });
        if (!isContent && !resisting) {
          // Hard to predict these values, but we can enforce constraints:
          ok(
            window.mozInnerScreenX >= chromeWindow.mozInnerScreenX,
            "mozInnerScreenX"
          );
          ok(
            window.mozInnerScreenY >= chromeWindow.mozInnerScreenY,
            "mozInnerScreenY"
          );
        }
        nextTest();
      }
    );
  };

  nextTest();
};
