<?php
/**
 * @package Polylang
 */

/**
 * Links model for use when using one domain per language
 * for example mysite.com/sth and mysite.fr/qqch
 * implements the "links_model interface"
 *
 * @since 1.2
 */
class PLL_Links_Domain extends PLL_Links_Abstract_Domain {

	/**
	 * An array with language code as keys and the host as values.
	 *
	 * @var string[]
	 */
	protected $hosts;

	/**
	 * Constructor
	 *
	 * @since 1.8
	 *
	 * @param object $model PLL_Model instance
	 */
	public function __construct( &$model ) {
		parent::__construct( $model );

		$this->hosts = $this->get_hosts();

		// Filter the site url ( mainly to get the correct login form )
		add_filter( 'site_url', array( $this, 'site_url' ) );
	}


	/**
	 * Adds the language code in url
	 * links_model interface
	 *
	 * @since 1.2
	 *
	 * @param string       $url  The url to modify.
	 * @param PLL_Language $lang The language object.
	 * @return string Modified url.
	 */
	public function add_language_to_link( $url, $lang ) {
		if ( ! empty( $lang ) && ! empty( $this->hosts[ $lang->slug ] ) ) {
			$url = preg_replace( '#://(' . wp_parse_url( $this->home, PHP_URL_HOST ) . ')($|/.*)#', '://' . $this->hosts[ $lang->slug ] . '$2', $url );
		}
		return $url;
	}

	/**
	 * Returns the url without language code
	 * links_model interface
	 *
	 * @since 1.2
	 *
	 * @param string $url url to modify
	 * @return string modified url
	 */
	public function remove_language_from_link( $url ) {
		if ( ! empty( $this->hosts ) ) {
			$url = preg_replace( '#://(' . implode( '|', $this->hosts ) . ')($|/.*)#', '://' . wp_parse_url( $this->home, PHP_URL_HOST ) . '$2', $url );
		}
		return $url;
	}

	/**
	 * Returns the home url in a given language.
	 * links_model interface.
	 *
	 * @since 1.3.1
	 *
	 * @param PLL_Language $lang PLL_Language object.
	 * @return string
	 */
	public function home_url( $lang ) {
		return trailingslashit( empty( $this->options['domains'][ $lang->slug ] ) ? $this->home : $this->options['domains'][ $lang->slug ] );
	}

	/**
	 * Get hosts managed on the website.
	 *
	 * @since 1.5
	 *
	 * @return string[] List of hosts.
	 */
	public function get_hosts() {
		$hosts = array();
		foreach ( $this->options['domains'] as $lang => $domain ) {
			$host = wp_parse_url( $domain, PHP_URL_HOST );
			// idn_to_ascii is much faster than the WordPress method.
			if ( function_exists( 'idn_to_ascii' ) ) {
				// The use of the constant is mandatory in PHP 7.2 and PHP 7.3 to avoid a deprecated notice.
				$hosts[ $lang ] = defined( 'INTL_IDNA_VARIANT_UTS46' ) ? idn_to_ascii( $host, 0, INTL_IDNA_VARIANT_UTS46 ) : idn_to_ascii( $host );
			} else {
				$hosts[ $lang ] = Requests_IDNAEncoder::encode( $host );
			}
		}

		return $hosts;
	}
}