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export const streamChunk = function* (chunk, chunkSize) {
  let len = chunk.byteLength;

  if (!chunkSize || len < chunkSize) {
    yield chunk;
    return;
  }

  let pos = 0;
  let end;

  while (pos < len) {
    end = pos + chunkSize;
    yield chunk.slice(pos, end);
    pos = end;
  }
}

export const readBytes = async function* (iterable, chunkSize, encode) {
  for await (const chunk of iterable) {
    yield* streamChunk(ArrayBuffer.isView(chunk) ? chunk : (await encode(String(chunk))), chunkSize);
  }
}

export const trackStream = (stream, chunkSize, onProgress, onFinish, encode) => {
  const iterator = readBytes(stream, chunkSize, encode);

  let bytes = 0;
  let done;
  let _onFinish = (e) => {
    if (!done) {
      done = true;
      onFinish && onFinish(e);
    }
  }

  return new ReadableStream({
    async pull(controller) {
      try {
        const {done, value} = await iterator.next();

        if (done) {
         _onFinish();
          controller.close();
          return;
        }

        let len = value.byteLength;
        if (onProgress) {
          let loadedBytes = bytes += len;
          onProgress(loadedBytes);
        }
        controller.enqueue(new Uint8Array(value));
      } catch (err) {
        _onFinish(err);
        throw err;
      }
    },
    cancel(reason) {
      _onFinish(reason);
      return iterator.return();
    }
  }, {
    highWaterMark: 2
  })
}
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