/**
 *
 * Austrian Company Register Numbers.
 *
 * Sources:
 *
 * ENTITY
 *
 */

import * as exceptions from '../exceptions';
import { strings } from '../util';
import { Validator, ValidateReturn } from '../types';

function clean(input: string): ReturnType<typeof strings.cleanUnicode> {
  const [value, err] = strings.cleanUnicode(input, ' -./');

  if (err) {
    return [value, err];
  }

  if (value.startsWith('FN')) {
    return [value.substring(2), null];
  }

  return [value, null];
}

const impl: Validator = {
  name: 'Austrian Company Register Number',
  localName: 'Company Register Number',
  compact(input: string): string {
    const [value, err] = clean(input);

    if (err) {
      throw err;
    }

    return value;
  },

  format(input: string): string {
    const [value] = clean(input);

    return value;
  },

  /**
   * Check if the number is a valid Business ID number.
   * This checks the length, formatting and other contraints. It does not check
   * for control letter.
   */
  validate(input: string): ValidateReturn {
    const [value, error] = clean(input);

    if (error) {
      return { isValid: false, error };
    }
    if (!/^\d+[A-Z]$/.test(value)) {
      return { isValid: false, error: new exceptions.InvalidFormat() };
    }

    return {
      isValid: true,
      compact: value,
      isIndividual: false,
      isCompany: true,
    };
  },
};

export const { name, localName, abbreviation, validate, format, compact } =
  impl;