export const defaultAbbreviations = ['', 'k', 'M', 'B', 'T', 'P', 'E'] as const;

/**
 * Abbreviates a number
 *
 * @example
 * numAbbr(1e3);
 * => "1k"
 *
 * @param a - A number
 * @param suppliedAbbreviations - Optional custom abbreviations
 */
export const numAbbr = (
  a: number,
  suppliedAbbreviations?: string[],
): string => {
  const abbreviations = suppliedAbbreviations || defaultAbbreviations;
  const positive = Math.sign(a) >= 0;

  a = Math.abs(a);

  const level = (Math.log10(a) / 3) | 0;

  if (level == 0) {
    return `${!positive ? '-' : ''}${a}`;
  }

  const abbreviation = abbreviations[level];

  if (!abbreviation) {
    throw new RangeError('Number out of range');
  }

  const result = String(Number((a / Math.pow(10, level * 3)).toFixed(1)));

  return `${!positive ? '-' : ''}${result}${abbreviation}`;
};

export { numAbbr as numAbbreviate, numAbbr as numberAbbreviate };