/**
 * AMKA (Αριθμός Μητρώου Κοινωνικής Ασφάλισης, Greek social security number).
 *
 * The Αριθμός Μητρώου Κοινωνικής Ασφάλισης (AMKA or Arithmos Mitroou Koinonikis
 * Asfalisis) is the personal identifier that is used for social security
 * purposes in Greece. The number consists of 11 digits and includes the
 * person's date of birth and gender.
 *
 * Source
 *    https://www.amka.gr/tieinai_en.html
 *
 * PERSON
 */

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

function clean(input: string): ReturnType<typeof strings.cleanUnicode> {
  return strings.cleanUnicode(input, ' -');
}

const impl: Validator = {
  name: 'Greek Social Security Number',
  localName: 'Αριθμός Μητρώου Κοινωνικής Ασφάλισης',
  abbreviation: 'AMKA',
  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;
  },

  validate(input: string): ValidateReturn {
    const [value, error] = clean(input);

    if (error) {
      return { isValid: false, error };
    }
    if (value.length !== 11) {
      return { isValid: false, error: new exceptions.InvalidLength() };
    }
    if (!strings.isdigits(value)) {
      return { isValid: false, error: new exceptions.InvalidFormat() };
    }

    const [dd, mm, yy] = strings.splitAt(value, 2, 4, 6);

    if (!isValidDate(yy, mm, dd)) {
      return { isValid: false, error: new exceptions.InvalidComponent() };
    }
    if (!luhnChecksumValidate(value)) {
      return { isValid: false, error: new exceptions.InvalidChecksum() };
    }

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

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