/**
 * Copyright (c) Facebook, Inc. and its affiliates.
 *
 * This source code is licensed under the MIT license found in the
 * LICENSE file in the root directory of this source tree.
 */

// Based on https://github.com/gatsbyjs/gatsby/pull/21518/files

// MacOS (APFS) and Windows (NTFS) filename length limit = 255 chars, Others = 255 bytes
const MAX_PATH_SEGMENT_CHARS = 255;
const MAX_PATH_SEGMENT_BYTES = 255;
// Space for appending things to the string like file extensions and so on
const SPACE_FOR_APPENDING = 10;

const isMacOs = process.platform === `darwin`;
const isWindows = process.platform === `win32`;

export const isNameTooLong = (str: string): boolean => {
  return isMacOs || isWindows
    ? str.length + SPACE_FOR_APPENDING > MAX_PATH_SEGMENT_CHARS // MacOS (APFS) and Windows (NTFS) filename length limit (255 chars)
    : Buffer.from(str).length + SPACE_FOR_APPENDING > MAX_PATH_SEGMENT_BYTES; // Other (255 bytes)
};

export const shortName = (str: string): string => {
  if (isMacOs || isWindows) {
    const overflowingChars = str.length - MAX_PATH_SEGMENT_CHARS;
    return str.slice(
      0,
      str.length - overflowingChars - SPACE_FOR_APPENDING - 1,
    );
  }
  const strBuffer = Buffer.from(str);
  const overflowingBytes =
    Buffer.byteLength(strBuffer) - MAX_PATH_SEGMENT_BYTES;
  return strBuffer
    .slice(
      0,
      Buffer.byteLength(strBuffer) - overflowingBytes - SPACE_FOR_APPENDING - 1,
    )
    .toString();
};