import stripIddPrefix from './stripIddPrefix.js';
import extractCountryCallingCodeFromInternationalNumberWithoutPlusSign from './extractCountryCallingCodeFromInternationalNumberWithoutPlusSign.js';
import Metadata from '../metadata.js';
import { MAX_LENGTH_COUNTRY_CODE } from '../constants.js';

/**
 * Converts a phone number digits (possibly with a `+`)
 * into a calling code and the rest phone number digits.
 * The "rest phone number digits" could include
 * a national prefix, carrier code, and national
 * (significant) number.
 * @param  {string} number — Phone number digits (possibly with a `+`).
 * @param  {string} [country] — Country.
 * @param  {string} [defaultCountry] — Default country.
 * @param  {string} [defaultCallingCode] — Default calling code (some phone numbering plans are non-geographic).
 * @param  {object} metadata
 * @return {object} `{ countryCallingCodeSource: string?, countryCallingCode: string?, number: string }`
 * @example
 * // Returns `{ countryCallingCode: "1", number: "2133734253" }`.
 * extractCountryCallingCode('2133734253', null, 'US', null, metadata)
 * extractCountryCallingCode('2133734253', null, null, '1', metadata)
 * extractCountryCallingCode('+12133734253', null, null, null, metadata)
 * extractCountryCallingCode('+12133734253', null, 'RU', null, metadata)
 */
export default function extractCountryCallingCode(number, country, defaultCountry, defaultCallingCode, metadata) {
  if (!number) {
    return {};
  }
  var isNumberWithIddPrefix;

  // If this is not an international phone number,
  // then either extract an "IDD" prefix, or extract a
  // country calling code from a number by autocorrecting it
  // by prepending a leading `+` in cases when it starts
  // with the country calling code.
  // https://wikitravel.org/en/International_dialling_prefix
  // https://github.com/catamphetamine/libphonenumber-js/issues/376
  if (number[0] !== '+') {
    // Convert an "out-of-country" dialing phone number
    // to a proper international phone number.
    var numberWithoutIDD = stripIddPrefix(number, country || defaultCountry, defaultCallingCode, metadata);
    // If an IDD prefix was stripped then
    // convert the number to international one
    // for subsequent parsing.
    if (numberWithoutIDD && numberWithoutIDD !== number) {
      isNumberWithIddPrefix = true;
      number = '+' + numberWithoutIDD;
    } else {
      // Check to see if the number starts with the country calling code
      // for the default country. If so, we remove the country calling code,
      // and do some checks on the validity of the number before and after.
      // https://github.com/catamphetamine/libphonenumber-js/issues/376
      if (country || defaultCountry || defaultCallingCode) {
        var _extractCountryCallin = extractCountryCallingCodeFromInternationalNumberWithoutPlusSign(number, country, defaultCountry, defaultCallingCode, metadata),
          countryCallingCode = _extractCountryCallin.countryCallingCode,
          shorterNumber = _extractCountryCallin.number;
        if (countryCallingCode) {
          return {
            countryCallingCodeSource: 'FROM_NUMBER_WITHOUT_PLUS_SIGN',
            countryCallingCode: countryCallingCode,
            number: shorterNumber
          };
        }
      }
      return {
        // No need to set it to `UNSPECIFIED`. It can be just `undefined`.
        // countryCallingCodeSource: 'UNSPECIFIED',
        number: number
      };
    }
  }

  // `number` can only be international at this point.

  // Fast abortion: country codes do not begin with a '0'
  if (number[1] === '0') {
    return {};
  }
  metadata = new Metadata(metadata);

  // The thing with country phone codes
  // is that they are orthogonal to each other
  // i.e. there's no such country phone code A
  // for which country phone code B exists
  // where B starts with A.
  // Therefore, while scanning digits,
  // if a valid country code is found,
  // that means that it is the country code.
  //
  var i = 2;
  while (i - 1 <= MAX_LENGTH_COUNTRY_CODE && i <= number.length) {
    var _countryCallingCode = number.slice(1, i);
    if (metadata.hasCallingCode(_countryCallingCode)) {
      metadata.selectNumberingPlan(_countryCallingCode);
      return {
        countryCallingCodeSource: isNumberWithIddPrefix ? 'FROM_NUMBER_WITH_IDD' : 'FROM_NUMBER_WITH_PLUS_SIGN',
        countryCallingCode: _countryCallingCode,
        number: number.slice(i)
      };
    }
    i++;
  }
  return {};
}

// The possible values for the returned `countryCallingCodeSource` are:
//
// Copy-pasted from:
// https://github.com/google/libphonenumber/blob/master/resources/phonenumber.proto
//
// // The source from which the country_code is derived. This is not set in the
// // general parsing method, but in the method that parses and keeps raw_input.
// // New fields could be added upon request.
// enum CountryCodeSource {
//  // Default value returned if this is not set, because the phone number was
//  // created using parse, not parseAndKeepRawInput. hasCountryCodeSource will
//  // return false if this is the case.
//  UNSPECIFIED = 0;
//
//  // The country_code is derived based on a phone number with a leading "+",
//  // e.g. the French number "+33 1 42 68 53 00".
//  FROM_NUMBER_WITH_PLUS_SIGN = 1;
//
//  // The country_code is derived based on a phone number with a leading IDD,
//  // e.g. the French number "011 33 1 42 68 53 00", as it is dialled from US.
//  FROM_NUMBER_WITH_IDD = 5;
//
//  // The country_code is derived based on a phone number without a leading
//  // "+", e.g. the French number "33 1 42 68 53 00" when defaultCountry is
//  // supplied as France.
//  FROM_NUMBER_WITHOUT_PLUS_SIGN = 10;
//
//  // The country_code is derived NOT based on the phone number itself, but
//  // from the defaultCountry parameter provided in the parsing function by the
//  // clients. This happens mostly for numbers written in the national format
//  // (without country code). For example, this would be set when parsing the
//  // French number "01 42 68 53 00", when defaultCountry is supplied as
//  // France.
//  FROM_DEFAULT_COUNTRY = 20;
// }
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