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/*
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 *  This file is part of CoCalc: Copyright © 2024 Sagemath, Inc.
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 *  License: Distributed under the terms of the Modified BSD License (same as ipywidgets)
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 */
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// Inspiration: this is meant to be a more modern version of upstream ipywidget's
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// packages/base-manager/src/utils.ts, which based on a non-maintained library.
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// Hence the BSD license.
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import { fromUint8Array, toUint8Array } from "js-base64";
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// Convert an ArrayBuffer to a base64 string.
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// UNCLEAR: I put in ArrayBufferView also, since it's mentioned in all the typings
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// in ipywidgets, and we can at least handle one case of it Uint8Array in
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// one direction.
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export function bufferToBase64(buffer: ArrayBuffer | ArrayBufferView): string {
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  if (buffer instanceof ArrayBuffer) {
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    return fromUint8Array(new Uint8Array(buffer));
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  } else if (buffer instanceof Uint8Array) {
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    return fromUint8Array(buffer);
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  }
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  throw new Error("buffer must be either ArrayBuffer or Uint8Array");
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}
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// Convert a base64 string to an ArrayBuffer.
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export function base64ToBuffer(base64: string): ArrayBuffer {
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  const buffer = toUint8Array(base64).buffer;
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  // @ts-ignore
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  return buffer;
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}
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