<?php

namespace CommerceGuys\Addressing\Formatter;

use CommerceGuys\Addressing\AddressFormat\AddressField;
use CommerceGuys\Addressing\AddressFormat\AddressFormat;
use CommerceGuys\Addressing\AddressFormat\AddressFormatRepositoryInterface;
use CommerceGuys\Addressing\AddressInterface;
use CommerceGuys\Addressing\Country\CountryRepositoryInterface;
use CommerceGuys\Addressing\Subdivision\SubdivisionRepositoryInterface;

/**
 * Formats an address for a postal/shipping label.
 *
 * Takes care of uppercasing fields where required by the format (to facilitate
 * automated mail sorting).
 *
 * Requires specifying the origin country code, allowing it
 * to differentiate between domestic and international mail.
 * In case of domestic mail, the country name is not displayed at all.
 * In case of international mail:
 * 1. The postal code is prefixed with the destination's postal code prefix.
 * 2. The country name is added to the formatted address, in both the
 *    current locale and English. This matches the recommendation given by
 *    the Universal Postal Union, to avoid difficulties in countries of transit.
 */
class PostalLabelFormatter extends DefaultFormatter implements PostalLabelFormatterInterface
{
	/**
	 * The default options.
	 *
	 * @var array
	 */
	protected $defaultOptions = [
	    'locale' => 'en',
	    'html' => false,
	    'html_tag' => 'p',
	    'html_attributes' => ['translate' => 'no'],
	    'origin_country' => '',
	];


	/**
	 * Creates a PostalFormatter instance.
	 *
	 * @param AddressFormatRepositoryInterface $addressFormatRepository
	 * @param CountryRepositoryInterface       $countryRepository
	 * @param SubdivisionRepositoryInterface   $subdivisionRepository
	 * @param array                            $defaultOptions
	 */
	public function __construct(
		AddressFormatRepositoryInterface $addressFormatRepository,
		CountryRepositoryInterface $countryRepository,
		SubdivisionRepositoryInterface $subdivisionRepository,
		array $defaultOptions = [],
	) {
		parent::__construct($addressFormatRepository, $countryRepository, $subdivisionRepository, $defaultOptions);

		if (!function_exists('mb_strtoupper')) {
		    throw new \RuntimeException('The "mbstring" extension is required by this class.');
		}
	}


	/**
	 * {@inheritdoc}
	 */
	protected function buildView(AddressInterface $address, AddressFormat $addressFormat, array $options): array
	{
		if (empty($options['origin_country'])) {
		    throw new \InvalidArgumentException("The origin_country option can't be empty.");
		}

		$view = parent::buildView($address, $addressFormat, $options);
		// Uppercase fields where required by the format.
		$uppercaseFields = $addressFormat->getUppercaseFields();
		foreach ($uppercaseFields as $uppercaseField) {
		    if (isset($view[$uppercaseField])) {
		        $view[$uppercaseField]['value'] = mb_strtoupper($view[$uppercaseField]['value'] ?? '', 'utf-8');
		    }
		}
		// Handle international mailing.
		if ($address->getCountryCode() != $options['origin_country']) {
		    // Prefix the postal code.
		    $field = AddressField::POSTAL_CODE;
		    if (isset($view[$field])) {
		        $view[$field]['value'] = $addressFormat->getPostalCodePrefix() . $view[$field]['value'];
		    }

		    // Universal Postal Union says: "The name of the country of
		    // destination shall be written preferably in the language of the
		    // country of origin. To avoid any difficulty in the countries of
		    // transit, it is desirable for the name of the country of
		    // destination to be added in an internationally known language.
		    $country = $view['country']['value'];
		    $englishCountries = $this->countryRepository->getList('en');
		    $englishCountry = $englishCountries[$address->getCountryCode()];
		    if ($country != $englishCountry) {
		        $country .= ' - ' . $englishCountry;
		    }
		    $view['country']['value'] = mb_strtoupper($country, 'utf-8');
		} else {
		    // The country is not written in case of domestic mailing.
		    $view['country']['value'] = '';
		}

		return $view;
	}
}
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