<?php

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class WPML_SEO_HeadLangs {

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private $sitepress;

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/**

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* @var WPML_Queried_Object_Factory

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*/

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private $queried_object_factory;

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/**

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* WPML_SEO_HeadLangs constructor.

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*

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* @param SitePress $sitepress

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* @param WPML_Queried_Object_Factory $queried_object_factory

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*/

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public function __construct( SitePress $sitepress, WPML_Queried_Object_Factory $queried_object_factory ) {

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$this->sitepress = $sitepress;

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$this->queried_object_factory = $queried_object_factory;

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}

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private function get_seo_settings() {

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$seo_settings = $this->sitepress->get_setting( 'seo', array() );

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if ( ! array_key_exists( 'head_langs', $seo_settings ) ) {

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$seo_settings['head_langs'] = 1;

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}

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if ( ! array_key_exists( 'head_langs_priority', $seo_settings ) ) {

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$seo_settings['head_langs_priority'] = 1;

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}

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return $seo_settings;

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}

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public function init_hooks() {

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if ( $this->sitepress->get_wp_api()->is_front_end() ) {

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$seo_settings = $this->get_seo_settings();

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$head_langs = $seo_settings['head_langs'];

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if ( $head_langs ) {

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$priority = $seo_settings['head_langs_priority'];

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add_action( 'wp_head', array( $this, 'head_langs' ), (int) $priority );

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}

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}

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}

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function head_langs() {

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$languages = $this->sitepress->get_ls_languages( array( 'skip_missing' => true ) );

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/**

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* @since 3.4.0

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*/

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$languages = apply_filters( 'wpml_head_langs', $languages );

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if ( $this->must_render( $languages ) ) {

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$hreflang_items = array();

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foreach ( $languages as $lang ) {

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/**

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* @since 3.3.7

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*/

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$alternate_hreflang = apply_filters( 'wpml_alternate_hreflang', $lang['url'], $lang['code'] );

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$hreflang_code = $this->get_hreflang_code( $lang );

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if ( $hreflang_code ) {

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$hreflang_items[ $hreflang_code ] = str_replace( '&amp;', '&', $alternate_hreflang );

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}

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}

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$hreflang_items = apply_filters( 'wpml_hreflangs', $hreflang_items );

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$hreflang = '';

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if ( is_array( $hreflang_items ) ) {

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foreach ( $hreflang_items as $hreflang_code => $hreflang_url ) {

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$hreflang .= '<link rel="alternate" hreflang="' . esc_attr( $hreflang_code ) . '" href="' . esc_url( $hreflang_url ) . '" />' . PHP_EOL;

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}

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echo apply_filters( 'wpml_hreflangs_html', $hreflang );

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}

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}

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}

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function render_menu() {

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$seo = $this->get_seo_settings();

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$options = array();

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foreach ( array( 1, 10 ) as $priority ) {

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$label = __( 'As early as possible', 'sitepress' );

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if ( $priority > 1 ) {

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$label = sprintf( esc_html__( 'Later in the head section (priority %d)', 'sitepress' ), $priority );

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}

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$options[ $priority ] = array(

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'selected' => ( $priority == $seo['head_langs_priority'] ),

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'label' => $label,

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);

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}

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?>

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<div class="wpml-section wpml-section-seo-options" id="lang-sec-9-5">

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<div class="wpml-section-header">

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<h3><?php esc_html_e( 'SEO Options', 'sitepress' ); ?></h3>

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</div>

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<div class="wpml-section-content">

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<form id="icl_seo_options" name="icl_seo_options" action="">

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<?php wp_nonce_field( 'icl_seo_options_nonce', '_icl_nonce' ); ?>

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<p>

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<input type="checkbox" id="icl_seo_head_langs" name="icl_seo_head_langs"

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<?php

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if ( $seo['head_langs'] ) {

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echo 'checked="checked"';

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}

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?>

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value="1"/>

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<label for="icl_seo_head_langs"><?php esc_html_e( 'Display alternative languages in the HEAD section.', 'sitepress' ); ?></label>

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</p>

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<p>

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<label for="wpml-seo-head-langs-priority"><?php esc_html_e( 'Position of hreflang links', 'sitepress' ); ?></label>

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<select name="wpml_seo_head_langs_priority" id="wpml-seo-head-langs-priority"

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<?php

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if ( ! $seo['head_langs'] ) {

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echo 'disabled="disabled"';

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}

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?>

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>

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<?php

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foreach ( $options as $priority => $option ) {

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?>

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<option value="<?php echo esc_html( $priority ); ?>" <?php echo $option['selected'] ? 'selected="selected"' : ''; ?>><?php echo esc_html( $option['label'] ); ?></option>

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<?php

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}

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?>

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</select>

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</p>

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<p class="buttons-wrap">

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<span class="icl_ajx_response" id="icl_ajx_response_seo"> </span>

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<input class="button button-primary" name="save" value="<?php esc_attr_e( 'Save', 'sitepress' ); ?>" type="submit"/>

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</p>

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</form>

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</div>

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</div>

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<?php

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}

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private function must_render( $languages ) {

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$must_render = false;

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$wpml_queried_object = $this->queried_object_factory->create();

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$has_languages = is_array( $languages ) && count( $languages ) > 0;

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if (

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$wpml_queried_object->has_object()

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&& $has_languages

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&& ! $this->sitepress->get_wp_api()->is_paged()

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) {

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if ( $wpml_queried_object->is_instance_of_post() ) {

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/** @var WP_Post $queried_object */

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$post_id = $wpml_queried_object->get_id();

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$is_single_or_page = $this->sitepress->get_wp_api()->is_single() || $this->sitepress->get_wp_api()->is_page();

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$is_published = $is_single_or_page

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&& $post_id

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&& $this->sitepress->get_wp_api()->get_post_status( $post_id ) === 'publish';

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$must_render = $this->sitepress->is_translated_post_type( $wpml_queried_object->get_post_type() )

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&& ( $is_published || $this->is_home_front_or_archive_page() );

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}

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if ( $wpml_queried_object->is_instance_of_taxonomy() ) {

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/** @var WP_Term $queried_object */

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$must_render = $this->sitepress->is_translated_taxonomy( $wpml_queried_object->get_taxonomy() );

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}

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if ( $wpml_queried_object->is_instance_of_post_type() ) {

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/** @var WP_Post_Type $queried_object */

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$must_render = $this->sitepress->is_translated_post_type( $wpml_queried_object->get_post_type_name() );

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}

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}

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return $must_render;

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}

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/**

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* @return bool

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*/

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private function is_home_front_or_archive_page() {

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return $this->sitepress->get_wp_api()->is_home()

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|| $this->sitepress->get_wp_api()->is_front_page()

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|| $this->sitepress->get_wp_api()->is_archive();

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}

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/**

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* @param array $lang

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*

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* @return string

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*/

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private function get_hreflang_code( $lang ) {

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$ordered_keys = [ 'tag', 'default_locale' ];

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$hreflang_code = '';

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foreach ( $ordered_keys as $key ) {

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if ( array_key_exists( $key, $lang ) && trim( $lang[ $key ] ) ) {

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$hreflang_code = $lang[ $key ];

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break;

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}

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}

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$hreflang_code = strtolower( str_replace( '_', '-', $hreflang_code ) );

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if ( $this->is_valid_hreflang_code( $hreflang_code ) ) {

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return trim( $hreflang_code );

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}

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return '';

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}

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private function is_valid_hreflang_code( $code ) {

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return strlen( trim( $code ) ) >= 2;

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}

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}

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