import _formatNumber from '../format.js';
import parse from '../parse.js';
import isObject from '../helpers/isObject.js';
export default function formatNumber() {
  const {
    input,
    format,
    options,
    metadata
  } = normalizeArguments(arguments);
  return _formatNumber(input, format, options, metadata);
}

// Sort out arguments
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, arg_5] = 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];
  const arg_5 = args[4];
  let input;
  let format;
  let options;
  let metadata;

  // Sort out arguments.

  // If the phone number is passed as a string.
  // `format('8005553535', ...)`.
  if (typeof arg_1 === 'string') {
    // If country code is supplied.
    // `format('8005553535', 'RU', 'NATIONAL', [options], metadata)`.
    if (typeof arg_3 === 'string') {
      format = arg_3;
      if (arg_5) {
        options = arg_4;
        metadata = arg_5;
      } else {
        metadata = arg_4;
      }
      input = parse(arg_1, {
        defaultCountry: arg_2,
        extended: true
      }, metadata);
    }
    // Just an international phone number is supplied
    // `format('+78005553535', 'NATIONAL', [options], metadata)`.
    else {
      if (typeof arg_2 !== 'string') {
        throw new Error('`format` argument not passed to `formatNumber(number, format)`');
      }
      format = arg_2;
      if (arg_4) {
        options = arg_3;
        metadata = arg_4;
      } else {
        metadata = arg_3;
      }
      input = parse(arg_1, {
        extended: true
      }, metadata);
    }
  }
  // If the phone number is passed as a parsed number object.
  // `format({ phone: '8005553535', country: 'RU' }, 'NATIONAL', [options], metadata)`.
  else if (isObject(arg_1)) {
    input = arg_1;
    format = arg_2;
    if (arg_4) {
      options = arg_3;
      metadata = arg_4;
    } else {
      metadata = arg_3;
    }
  } else throw new TypeError('A phone number must either be a string or an object of shape { phone, [country] }.');

  // Legacy lowercase formats.
  if (format === 'International') {
    format = 'INTERNATIONAL';
  } else if (format === 'National') {
    format = 'NATIONAL';
  }
  return {
    input,
    format,
    options,
    metadata
  };
}
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