<!doctype html>
<title>Test processor port assignment on processor callback function construction</title>
<script src=/resources/testharness.js></script>
<script src=/resources/testharnessreport.js></script>
<script>
// https://webaudio.github.io/web-audio-api/#AudioWorkletProcessor-instantiation

const get_context_for_node_name = async (node_name) => {
  const context = new AudioContext();
  const filePath = `processors/construction-port-${node_name}.js`;
  await context.audioWorklet.addModule(filePath);
  return context;
}

const test_throws = async ({node_name, thrower} = {}) => {
  const context = await get_context_for_node_name(node_name);
  const node = new AudioWorkletNode(context, node_name);
  const event = await new Promise((resolve) => {
    node.port.onmessage = resolve;
  });
  assert_true(event.data.threw, `${thrower} should throw`);
  assert_equals(event.data.errorName, "TypeError");
  assert_true(event.data.isTypeError, "exception should be TypeError");
};

const throw_tests = [
  {
    test_name: 'super() after new AudioWorkletProcessor()',
    node_name: 'super-after-new',
    thrower: 'super()'
  },
  {
    test_name: 'new AudioWorkletProcessor() after super()',
    node_name: 'new-after-super',
    thrower: 'new AudioWorkletProcessor()'
  },
  {
    test_name: 'new AudioWorkletProcessor() after new AudioWorkletProcessor()',
    node_name: 'new-after-new',
    thrower: 'new AudioWorkletProcessor()'
  }
];
for (const test_info of throw_tests) {
  promise_test(async () => test_throws(test_info), test_info.test_name);
}

promise_test(async (t) => {
  const node_name = 'singleton';
  const context = await get_context_for_node_name(node_name);
  const node1 = new AudioWorkletNode(context, node_name);
  const node2 = new AudioWorkletNode(context, node_name);
  node2.onmessage = t.unreached_func("node2 should not receive a message");
  let count = 0;
  await new Promise((resolve) => {
    node1.port.onmessage = t.step_func((event) => {
      assert_less_than(count, 2, "message count");
      if (++count == 2) { resolve(); };
    });
  });
}, 'Singleton AudioWorkletProcessor');
</script>
