import isViablePhoneNumber from '../helpers/isViablePhoneNumber.js';
import _getNumberType from '../helpers/getNumberType.js';
import isObject from '../helpers/isObject.js';
import parse from '../parse.js';

// Finds out national phone number type (fixed line, mobile, etc)
export default function getNumberType() {
  const {
    input,
    options,
    metadata
  } = normalizeArguments(arguments);
  // `parseNumber()` would return `{}` when no phone number could be parsed from the input.
  if (!input.phone) {
    return;
  }
  return _getNumberType(input, options, metadata);
}

// Sort out arguments
export function normalizeArguments(args) {
  // This line of code appeared to not work correctly with `babel`/`istanbul`:
  // for some weird reason, it caused coverage less than 100%.
  // That's because `babel`/`istanbul`, for some weird reason,
  // apparently doesn't know how to properly exclude Babel polyfills from code coverage.
  //
  // const [arg_1, arg_2, arg_3, arg_4] = Array.prototype.slice.call(args)

  const arg_1 = args[0];
  const arg_2 = args[1];
  const arg_3 = args[2];
  const arg_4 = args[3];
  let input;
  let options = {};
  let metadata;

  // If the phone number is passed as a string.
  // `getNumberType('88005553535', ...)`.
  if (typeof arg_1 === 'string') {
    // If "default country" argument is being passed
    // then convert it to an `options` object.
    // `getNumberType('88005553535', 'RU', metadata)`.
    if (!isObject(arg_2)) {
      if (arg_4) {
        options = arg_3;
        metadata = arg_4;
      } else {
        metadata = arg_3;
      }

      // `parse` extracts phone numbers from raw text,
      // therefore it will cut off all "garbage" characters,
      // while this `validate` function needs to verify
      // that the phone number contains no "garbage"
      // therefore the explicit `isViablePhoneNumber` check.
      if (isViablePhoneNumber(arg_1)) {
        input = parse(arg_1, {
          defaultCountry: arg_2
        }, metadata);
      } else {
        input = {};
      }
    }
    // No "resrict country" argument is being passed.
    // International phone number is passed.
    // `getNumberType('+78005553535', metadata)`.
    else {
      if (arg_3) {
        options = arg_2;
        metadata = arg_3;
      } else {
        metadata = arg_2;
      }

      // `parse` extracts phone numbers from raw text,
      // therefore it will cut off all "garbage" characters,
      // while this `validate` function needs to verify
      // that the phone number contains no "garbage"
      // therefore the explicit `isViablePhoneNumber` check.
      if (isViablePhoneNumber(arg_1)) {
        input = parse(arg_1, undefined, metadata);
      } else {
        input = {};
      }
    }
  }
  // If the phone number is passed as a parsed phone number.
  // `getNumberType({ phone: '88005553535', country: 'RU' }, ...)`.
  else if (isObject(arg_1)) {
    input = arg_1;
    if (arg_3) {
      options = arg_2;
      metadata = arg_3;
    } else {
      metadata = arg_2;
    }
  } else throw new TypeError('A phone number must either be a string or an object of shape { phone, [country] }.');
  return {
    input,
    options,
    metadata
  };
}
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