<!doctype html>
<script src="../resources/testharness.js"></script>
<script src="../resources/testharnessreport.js"></script>
<script src="./resources/resizeTestHelper.js"></script>
<p>ResizeObserver tests</p>
<div id="target1" style="width:100px;height:100px;">t1</div>
<div id="target2" style="width:100px;height:100px;">t2</div>
<img id="target3" style="width:100px;height:100px;">
<iframe src="./resources/iframe.html" width="300px" height="100px" style="display:block"></iframe>
<script>
'use strict';

let t1 = document.querySelector('#target1');
let t2 = document.querySelector('#target2');

// allow uncaught exception because ResizeObserver posts exceptions
// to window error handler when limit is exceeded.
setup({allow_uncaught_exception: true});

function test0() {
  let helper = new ResizeTestHelper(
    "test0: simple observation",
  [
    {
      setup: observer => {
        observer.observe(t1);
        t1.style.width = "5px";
      },
      notify: entries => {
        assert_equals(entries.length, 1, "1 pending notification");
        assert_equals(entries[0].target, t1, "target is t1");
        assert_equals(entries[0].contentRect.width, 5, "target width");
      }
    }
  ]);
  return helper.start();
}

function test1() {
  let helper = new ResizeTestHelper(
    "test1: multiple observation on same element trigger only one",
  [
    {
      setup: observer => {
        observer.observe(t1);
        observer.observe(t1);
        t1.style.width = "10px";
      },
      notify: entries => {
        assert_equals(entries.length, 1, "1 pending notification");
      }
    }
  ]);
  return helper.start();
}

function test2() {
  test(() => {
      assert_throws(null, _=> {
        let ro = new ResizeObserver(() => {});
        ro.observe({});
      });
    },
    "test2: throw exception when observing non-element"
  );
  return Promise.resolve();
}

function test3() {
  let helper = new ResizeTestHelper(
    "test3: disconnect stops all notifications", [
    {
      setup: observer => {
        observer.observe(t1);
        observer.observe(t2);
        observer.disconnect();
        t1.style.width = "30px";
      },
      notify: entries => {
         assert_unreached("no entries should be observed");
      },
      timeout: () => {
        // expected
      }
    }
  ]);
  return helper.start();
}

function test4() {
  let helper = new ResizeTestHelper(
    "test4: unobserve target stops notifications, unobserve non-observed does nothing", [
    {
      setup: observer => {
        observer.observe(t1);
        observer.observe(t2);
        observer.unobserve(t1);
        observer.unobserve(document.body);
        t1.style.width = "40px";
        t2.style.width = "40px";
      },
      notify: entries => {
        assert_equals(entries.length, 1, "only t2");
        assert_equals(entries[0].target, t2, "t2 was observed");
      }
    }
  ]);
  return helper.start();
}

function test5() {
  let t3 = document.querySelector('#target3');
  var helper = new ResizeTestHelper("test5: observe img",[
    {
      setup: observer => {
        observer.observe(t3);
      },
      notify: entries => {
      }
    },
    {
      setup: observer => {
        t3.style.width = "100.5px";
      },
      notify: entries => {
        assert_equals(entries.length, 1);
        assert_equals(entries[0].contentRect.width, 100.5);
      }
    }
  ]);
  return helper.start();
}

function test6() {
  let resolvePromise;
  let promise = new Promise((resolve) => {
    resolvePromise = resolve;
  });
  let test = async_test('test6: iframe notifications');
  let testRequested = false;
  let iframe = document.querySelector('iframe');
  window.addEventListener('message', event => {
    switch(event.data) {
    case 'readyToTest':
      if (!testRequested) {
        //iframe.contentWindow.postMessage('startTest', '*');
        testRequested = true;
        test.step(()=>{test.done()});
        resolvePromise();
      }
    break;
    case 'success':
    case 'fail':
      window.requestAnimationFrame(() => {
        test.step( () => {
          assert_equals(event.data, 'success');
          test.done();
          resolvePromise();
        });
      });
    break;
    }
  }, false);
  return promise;
}

function test7() {
  let harnessTest = async_test("test7: callback.this");
  let resolvePromise;
  let ro = new ResizeObserver( function(entries, obs)  {
    let callbackThis = this;
    resolvePromise();
    harnessTest.step(() => {
      assert_equals(callbackThis, ro, "callback.this is ResizeObserver");
      assert_equals(obs, ro, "2nd argument is ResizeObserver");
      ro.disconnect();
      // every reference to RO must be null before test completes
      // to avoid triggering test leak-detection
      ro = null;
      callbackThis = null;
      obs = null;
      harnessTest.done();
     });
    }
  );
  ro.observe(t1);

  return new Promise( (resolve, reject) => {
    resolvePromise = resolve;
  });
}
let guard = async_test('guard');
test0()
  .then(() => { return test1(); })
  .then(() => { return test2(); })
  .then(() => { return test3(); })
  .then(() => { return test4(); })
  .then(() => { return test5(); })
  .then(() => { return test6(); })
  .then(() => { return test7(); })
  .then(() => { guard.done(); });

</script>