<?php

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if ( ! defined( 'ABSPATH' ) ) {

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exit;

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}

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/**

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* Class: To enable Infinite Scroll in AMP

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* Note: For performance reasons the component will render a maximum of three documents (total) on screen at one time. This limit may be changed or removed in the future.

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* Read more about it here: https://www.ampproject.org/docs/reference/components/amp-next-page

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*/

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if( ! class_exists('AMPforWP_Infinite_Scroll') ) {

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class AMPforWP_Infinite_Scroll

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{

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private $paged;

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private $is_single = false;

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private $is_loop = false;

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function __construct()

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{

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$this->is_single = true == $this->is_single() ? $this->is_single() : $this->is_single;

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$this->is_loop = true == $this->is_loop() ? $this->is_loop() : $this->is_loop;

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$this->paged = $this->paged();

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if ( $this->is_single && 'page' != get_post_type(ampforwp_get_the_ID()) ){

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// amp-next-page experiment meta tag

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add_action('amp_experiment_meta', array( $this, 'amp_experiment_meta') );

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// amp-next-page script

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add_filter('ampforwp_post_template_data', array( $this , 'amp_infinite_scroll_script') );

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// amp-next-page tag

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if ( 4 != ampforwp_get_setting('amp-design-selector') || (class_exists('AmpforwpAmpLayouts')) && 3 == ampforwp_get_setting('single-design-type') )

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add_action('ampforwp_above_related_post', array( $this , 'amp_next_page') );

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else {

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if (true == ampforwp_get_setting('ampforwp-infinite-scroll-new-features')) {

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add_action('ampforwp_global_after_footer', array( $this , 'amp_next_page') );

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}else{

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add_action('ampforwp_single_design_type_handle', array( $this , 'amp_next_page') );

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}

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}

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}

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if ( $this->is_loop ) {

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// amp-next-page experiment meta tag

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add_action('amp_experiment_meta', array( $this, 'amp_experiment_meta') );

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// amp-next-page script

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add_filter('ampforwp_post_template_data', array( $this , 'amp_infinite_scroll_script') );

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// amp-next-page tag

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add_action('ampforwp_loop_before_pagination', array( $this , 'amp_next_page') );

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// Next Posts Link

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add_filter('ampforwp_next_posts_link', array( $this , 'next_posts_link') , 10 , 2 );

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}

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}

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public function is_single() {

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if ( is_single() && true == ampforwp_get_setting('ampforwp-infinite-scroll-single') ) {

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return true;

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}

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return false;

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}

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public function is_loop() {

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$script = true;

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if ( (ampforwp_is_home() || is_archive()) && (true == ampforwp_get_setting('ampforwp-infinite-scroll-home') || true == ampforwp_get_setting('ampforwp-wcp-infinite-scroll') ) ) {

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if( function_exists('is_product_category') && is_product_category() || function_exists('is_product_tag') && is_product_tag() || function_exists('is_shop') && is_shop()){

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$script = false;

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}

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$script = apply_filters('ampforwp_modify_infinite_scroll_script', $script);

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return $script;

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}

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return false;

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}

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public function paged() {

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$paged = get_query_var( 'paged' );

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$page = get_query_var( 'page' );

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if ( $paged ) {

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return intval($paged);

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} elseif ( $page ) {

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return intval($page);

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} else {

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return 1;

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}

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}

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public function amp_experiment_meta() {

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echo '<meta name="amp-experiments-opt-in" content="amp-next-page">';

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}

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public function amp_infinite_scroll_script( $data ) {

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if ( empty( $data['amp_component_scripts']['amp-next-page'] ) ) {

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if (true == ampforwp_get_setting('ampforwp-infinite-scroll-new-features')) {

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$data['amp_component_scripts']['amp-next-page'] = 'https://cdn.ampproject.org/v0/amp-next-page-latest.js';

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}else{

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$data['amp_component_scripts']['amp-next-page'] = 'https://cdn.ampproject.org/v0/amp-next-page-0.1.js';

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}

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}

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return $data;

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}

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public function amp_next_page() {

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$loop_link = $first_url = $first_title = $first_image = $second_url = $second_image = $second_title ='';

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$single_links = $single_titles = $single_images = $classes = $pages = array();

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if ( $this->is_loop ) {

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$loop_link = $this->loop_link();

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$loop_link1 = $loop_link2 = '';

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$loop_link1 = $loop_link.($this->paged+1);

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$loop_link2 = $loop_link.($this->paged+2);

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if ( true == ampforwp_get_setting('amp-core-end-point') ) {

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$loop_link1 = ampforwp_url_controller($loop_link1);

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$loop_link2 = ampforwp_url_controller($loop_link2);

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}

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if (true == ampforwp_get_setting('ampforwp-infinite-scroll-new-features')) {

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$pages[] = array('title'=>'','image'=>'','url'=>$loop_link1);

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}else{

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$pages[] = array('title'=>'','image'=>'','ampUrl'=>$loop_link1);

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$pages[] = array('title'=>'','image'=>'','ampUrl'=>$loop_link2);

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}

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}

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if ( $this->is_single ) {

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$pages = $this->single_post();

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}

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$classes = $this->hide();

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?>

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<amp-next-page>

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<script type="application/json">

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<?php

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if (true == ampforwp_get_setting('ampforwp-infinite-scroll-new-features')) {

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echo wp_json_encode($pages);

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}else{

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?>

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{

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"pages": <?php echo wp_json_encode($pages);?>,

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"hideSelectors": <?php echo ampforwp_css_sanitizer($classes);?>

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}

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<?php } ?>

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</script>

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</amp-next-page>

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<?php }

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public function single_post() {

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global $post;

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$pages = array();

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$exclude_ids = ampforwp_exclude_posts();

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$exclude_ids[] = $post->ID;

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$query_args = array(

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'post_type' => get_post_type(),

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'orderby' => 'date',

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'ignore_sticky_posts' => 1,

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'paged' => esc_attr($this->paged),

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'post__not_in' => $exclude_ids,

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'has_password' => false ,

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'post_status'=> 'publish',

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'posts_per_page' => 2,

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'no_found_rows' => true

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);

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if (ampforwp_get_setting('ampforwp-infinite-scroll-single') && ampforwp_get_setting('ampforwp-infinite-scroll-single-category')){

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$categories = get_the_category($post->ID);

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$category_ids = array();

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if ($categories) {

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foreach($categories as $individual_category){

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$category_ids[] = $individual_category->cat_ID;

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}

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if(class_exists( 'WPSEO_Options' )){

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$primary_cat = get_post_meta(ampforwp_get_the_ID(), '_yoast_wpseo_primary_category', true);

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if (isset($primary_cat)) {

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$primary_cat = explode( " ", $primary_cat);

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$category_ids = array_intersect($category_ids,

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$primary_cat);

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}

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}

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}

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$query_args['category__in'] = $category_ids;

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}

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if (ampforwp_get_setting('ampforwp-infinite-scroll-single') && ampforwp_get_setting('ampforwp-infinite-scroll-single-tag')){

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$tags = get_the_tags(ampforwp_get_the_ID());

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if ($tags) {

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$tags_ids = array();

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foreach($tags as $individual_tag){

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$tags_ids[] = $individual_tag->term_id;

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}

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}

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$query_args['tag__in'] = $tags_ids;

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}

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$query_args = apply_filters('ampforwp_infinite_scroll_query_args', $query_args);

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$query = new WP_Query( $query_args );

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while ($query->have_posts()) {

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$query->the_post();

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if (true == ampforwp_get_setting('ampforwp-infinite-scroll-new-features')) {

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$pages[] = array('title'=>get_the_title(),'image'=>ampforwp_get_post_thumbnail('url', 'full'),'url'=>ampforwp_url_controller( get_permalink() ));

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}else{

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$pages[] = array('title'=>get_the_title(),'image'=>ampforwp_get_post_thumbnail('url', 'full'),'ampUrl'=>ampforwp_url_controller( get_permalink() ));

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}

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}

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wp_reset_postdata();

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return $pages;

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}

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public function loop_link() {

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global $wp;

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$amp_url = trailingslashit(home_url($wp->request));

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if( $this->paged < 2 ) {

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$amp_url = trailingslashit($amp_url.'page');

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}

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else

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$amp_url = str_replace('/'.$this->paged, '', $amp_url);

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return $amp_url;

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}

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public function hide() {

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$classes = array();

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$design = ampforwp_get_setting('amp-design-selector');

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if ( 1 == $design ) {

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$classes = array("#pagination",".related_posts", ".amp-wp-footer",".amp-wp-header",".f-w");

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}

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if ( 2 == $design ) {

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$classes = array("#headerwrap","#pagination","#footer",".nav_container",".related_posts",".f-w");

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}

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if ( 3 == $design ) {

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$classes = array("#headerwrap",".relatedpost",".footer_wrapper",".pagination-holder",".f-w");

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}

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if ( 4 == $design ) {

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$classes = array(".p-m-fl",".loop-pagination",".footer",".r-pf",".srp ul",".srp h3","#pagination",".h_m_w", ".f-w");

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}

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$classes = (array) apply_filters('ampforwp_infinite_scroll_exclude_items', $classes);

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return wp_json_encode($classes);

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}

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public function next_posts_link( $next_link , $paged ) {

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// Change the next link to paged+3

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// reason: amp-next-page will show the results for 3 pages

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$next_link = preg_replace('/'.($paged+1).'/', ($paged+3), $next_link);

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//Pagination + infinite scroll creates 404 links #5167

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preg_match_all('/<a href="(.*?)"(.*?)<\/a>/', $next_link, $match);

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$url = $match[1][0];

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$headers = get_headers($url, 1);

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if(isset($headers[0]) && !stripos($headers[0], "200 OK")){

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return;

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}

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return $next_link;

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}

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}

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// Initiate the Class

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new AMPforWP_Infinite_Scroll();

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}

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