// META: global=window,dedicatedworker
// META: script=/webcodecs/utils.js

// TODO(sandersd): Move metadata into a helper library.
// TODO(sandersd): Add H.264 decode test once there is an API to query for
// supported codecs.
let h264 = {
  async buffer() { return (await fetch('h264.mp4')).arrayBuffer(); },
  codec: "avc1.64000c",
  description: {offset: 7229, size: 46},
  frames: [{offset: 48, size: 4007},
           {offset: 4055, size: 926},
           {offset: 4981, size: 241},
           {offset: 5222, size: 97},
           {offset: 5319, size: 98},
           {offset: 5417, size: 624},
           {offset: 6041, size: 185},
           {offset: 6226, size: 94},
           {offset: 6320, size: 109},
           {offset: 6429, size: 281}]
};

let vp9 = {
  async buffer() { return (await fetch('vp9.mp4')).arrayBuffer(); },
  // TODO(sandersd): Verify that the file is actually level 1.
  codec: "vp09.00.10.08",
  frames: [{offset: 44, size: 3315},
           {offset: 3359, size: 203},
           {offset: 3562, size: 245},
           {offset: 3807, size: 172},
           {offset: 3979, size: 312},
           {offset: 4291, size: 170},
           {offset: 4461, size: 195},
           {offset: 4656, size: 181},
           {offset: 4837, size: 356},
           {offset: 5193, size: 159}]
};

function view(buffer, {offset, size}) {
  return new Uint8Array(buffer, offset, size);
}

function getFakeChunk() {
  return new EncodedVideoChunk({
    type:'key',
    timestamp:0,
    data:Uint8Array.of(0)
  });
}

promise_test(t => {
  // VideoDecoderInit lacks required fields.
  assert_throws_js(TypeError, () => { new VideoDecoder({}); });

  // VideoDecoderInit has required fields.
  let decoder = new VideoDecoder(getDefaultCodecInit(t));

  assert_equals(decoder.state, "unconfigured");

  decoder.close();

  return endAfterEventLoopTurn();
}, 'Test VideoDecoder construction');

promise_test(t => {
  let decoder = new VideoDecoder(getDefaultCodecInit(t));

  let badCodecsList = [
    '',                         // Empty codec
    'bogus',                    // Non exsitent codec
    'vorbis',                   // Audio codec
    'vp9',                      // Ambiguous codec
    'video/webm; codecs="vp9"'  // Codec with mime type
  ]

  testConfigurations(decoder, { codec: vp9.codec }, badCodecsList);

  return endAfterEventLoopTurn();
}, 'Test VideoDecoder.configure()');

promise_test(async t => {
  let buffer = await vp9.buffer();

  let numOutputs = 0;
  let decoder = new VideoDecoder({
    output(frame) {
      t.step(() => {
        assert_equals(++numOutputs, 1, "outputs");
        assert_equals(frame.cropWidth, 320, "cropWidth");
        assert_equals(frame.cropHeight, 240, "cropHeight");
        assert_equals(frame.timestamp, 0, "timestamp");
        frame.destroy();
      });
    },
    error(e) {
      t.step(() => { throw e; });
    }
  });

  decoder.configure({codec: vp9.codec});

  decoder.decode(new EncodedVideoChunk({
    type:'key',
    timestamp:0,
    data: view(buffer, vp9.frames[0])
  }));

  await decoder.flush();

  assert_equals(numOutputs, 1, "outputs");
}, 'Decode VP9');

promise_test(async t => {
  let buffer = await vp9.buffer();

  let decoder = new VideoDecoder({
    output(frame) {
      t.step(() => {
        assert_unreached("reset() should prevent this output from arriving");
      });
    },
    error(e) {
      t.step(() => { throw e; });
    }
  });

  decoder.configure({codec: vp9.codec});

  decoder.decode(new EncodedVideoChunk({
    type:'key',
    timestamp:0,
    data: view(buffer, vp9.frames[0])
  }));

  let flushPromise = decoder.flush();

  decoder.reset()

  assert_equals(decoder.decodeQueueSize, 0);

  await promise_rejects_exactly(t, undefined, flushPromise);

  endAfterEventLoopTurn();
}, 'Verify reset() suppresses output and rejects flush');

promise_test(t => {
  let decoder = new VideoDecoder(getDefaultCodecInit(t));

  return testClosedCodec(t, decoder, { codec: vp9.codec }, getFakeChunk());
}, 'Verify closed VideoDecoder operations');

promise_test(t => {
  let decoder = new VideoDecoder(getDefaultCodecInit(t));

  return testUnconfiguredCodec(t, decoder, getFakeChunk());
}, 'Verify unconfigured VideoDecoder operations');

promise_test(t => {
  let numErrors = 0;
  let codecInit = getDefaultCodecInit(t);
  codecInit.error = _ => numErrors++;

  let decoder = new VideoDecoder(codecInit);

  decoder.configure({codec: vp9.codec});

  let fakeChunk = getFakeChunk();
  decoder.decode(fakeChunk);

  return promise_rejects_exactly(t, undefined, decoder.flush()).then(
      () => {
        assert_equals(numErrors, 1, "errors");
        assert_equals(decoder.state, "closed");
      });
}, 'Decode corrupt VP9 frame');

promise_test(t => {
  let numErrors = 0;
  let codecInit = getDefaultCodecInit(t);
  codecInit.error = _ => numErrors++;

  let decoder = new VideoDecoder(codecInit);

  decoder.configure({codec: vp9.codec});

  let fakeChunk = getFakeChunk();
  decoder.decode(fakeChunk);

  return promise_rejects_exactly(t, undefined, decoder.flush()).then(
      () => {
        assert_equals(numErrors, 1, "errors");
        assert_equals(decoder.state, "closed");
      });
}, 'Decode empty VP9 frame');

promise_test(t => {
  let decoder = new VideoDecoder(getDefaultCodecInit(t));

  decoder.configure({codec: vp9.codec});

  let fakeChunk = getFakeChunk();
  decoder.decode(fakeChunk);

  // Create the flush promise before closing, as it is invalid to do so later.
  let flushPromise = decoder.flush();

  // This should synchronously reject the flush() promise.
  decoder.close();

  // TODO(sandersd): Wait for a bit in case there is a lingering output
  // or error coming.
  return promise_rejects_exactly(t, undefined, flushPromise);
}, 'Close while decoding corrupt VP9 frame');