<?php

// Register REST API Route
add_action( 'rest_api_init', function () {
   $namespace = 'ajaxloadmore';
   $endpoint = '/acf';
	register_rest_route( $namespace, $endpoint,
		array(
			'methods' => 'GET',
			'callback' => 'alm_acf_query',
		)
	);
});


/**
 * alm_acf_query
 * Query ACF fields and return data to ALM
 * 
 * @param $req $_GET
 * @since 1.0
 * @return JSON
 */
function alm_acf_query( WP_REST_Request $req ) {
	
	if(!isset($req)){ return false; }
	
	error_reporting(E_ALL|E_STRICT);	  

   $data = (isset($req['acf'])) ? $req['acf'] : ''; // $acf object array

   $repeater = (isset($req['repeater'])) ? $req['repeater'] : 'default';
	$type = alm_get_repeater_type($repeater);
	$theme_repeater = (isset($req['theme_repeater'])) ? $req['theme_repeater'] : 'null';
   $posts_per_page = (isset($req['posts_per_page'])) ? $req['posts_per_page'] : 5;
   $page = (isset($req['page'])) ? $req['page'] : 1;
   $offset = (isset($req['offset'])) ? $req['offset'] : 0;
   $canonical_url = (isset($req['canonical_url'])) ? $req['canonical_url'] : $_SERVER['HTTP_REFERER'];

   // Cache Add-on
   $cache_id = (isset($req['cache_id'])) ? $req['cache_id'] : '';

   // Preload Add-on
	$preloaded = (isset($req['preloaded'])) ? $req['preloaded'] : false;
	$preloaded_amount = (isset($req['preloaded_amount'])) ? $req['preloaded_amount'] : '5';
	if(has_action('alm_preload_installed') && $preloaded === 'true'){
	   // If preload - offset the posts_per_page + preload_amount
	   $old_offset = $preloaded_amount;
	   $offset = $offset + $preloaded_amount;
   }

   // SEO Add-on
	$seo_start_page = (isset($req['seo_start_page'])) ? $req['seo_start_page'] : 1;


   /*
	 *	alm_cache_create_dir
	 *
	 * Cache Add-on hook
	 * Create cache directory + meta .txt file
	 *
	 * @return null
	 */
   if(!empty($cache_id) && has_action('alm_cache_create_dir')){
      apply_filters('alm_cache_create_dir', $cache_id, $canonical_url);
      $page_cache = ''; // set our page cache variable
   }


   if($data){

      $acf_data = '';
      $acf = (isset($data['acf'])) ? $data['acf'] : false; // true / false
		$post_id = (isset($data['post_id'])) ? $data['post_id'] : ''; // Post ID
		$field_type = (isset($data['field_type'])) ? $data['field_type'] : 'repeater'; // ACF Field Type
		$field_name = (isset($data['field_name'])) ? $data['field_name'] : ''; // ACF Field Type

		if(empty($field_name) || empty($post_id)){
			$acf = false; // If field_name and post_id are not set, exit
		}

		if($acf && $post_id){

			// Repeater -OR- Flexible Content
			if($field_type === 'repeater' || $field_type === 'flexible'){

				if( have_rows($field_name, $post_id)){

					$total = count(get_field($field_name, $post_id));
					$per_page = ($posts_per_page * $page) + 1;
					$start = ($posts_per_page * $page) + $offset;
					$end = $start + $posts_per_page;

					$count = 0;
					$row_counter = 0;

					ob_start();

					while (have_rows($field_name, $post_id)) : the_row();

						// Only display rows between the values
						if ($row_counter < $posts_per_page && $count >= $start) {
							$row_counter++;

							// Set ALM Variables
							$alm_found_posts = $total;
							$alm_page = $page + 1;
							$alm_item = $count + 1;
							$alm_current = $row_counter + 1;

							if($theme_repeater != 'null' && has_action('alm_get_theme_repeater')){
								do_action('alm_get_theme_repeater', $theme_repeater, $alm_found_posts, $alm_page, $alm_item, $alm_current); // Theme Repeater
							}else{
								include(alm_get_current_repeater( $repeater, $type )); // Repeater
							}

						}
						$count++;

						if($count >= $end){
							break; // exit
						}

					endwhile;

					$acf_data = ob_get_clean();


               /*
                *	alm_cache_file
                *
                * Cache Add-on hook
                * If Cache is enabled, check the cache file
                *
                * @return null
                */
               if(!empty($cache_id) && has_action('alm_cache_installed') && !empty($acf_data)){
                  apply_filters('alm_cache_file', $cache_id, $page, $seo_start_page, $acf_data, $preloaded);
               }

				}
			}

			// Gallery
			if($field_type === 'gallery'){

				$images = get_field($field_name, $post_id);

				if( $images ) {

					$total = count(get_field($field_name, $post_id));
					$per_page = ($posts_per_page * $page) + 1;
					$start = ($posts_per_page * $page) + $offset;
					$end = $start + $posts_per_page;

					$count = 0;
					$row_counter = 0;

					ob_start();

					foreach( $images as $image ) :

						// Only display rows between the values
						if ($row_counter < $posts_per_page && $count >= $start) {
							$row_counter++;

							// Set ALM Variables
							$alm_found_posts = $total;
							$alm_page = $page + 1;
							$alm_item = $count + 1;
							$alm_current = $row_counter + 1;

							if($theme_repeater != 'null' && has_action('alm_get_acf_gallery_theme_repeater')){
								do_action('alm_get_acf_gallery_theme_repeater', $theme_repeater, $alm_found_posts, $alm_page, $alm_item, $alm_current, $image); // Theme Repeater
							}else{
								include(alm_get_current_repeater( $repeater, $type )); // Repeater
							}

						}
						$count++;

						if($count >= $end){
							break; // exit
						}

					endforeach;

					$acf_data = ob_get_clean();


               /*
                *	alm_cache_file
                *
                * Cache Add-on hook
                * If Cache is enabled, check the cache file
                *
                * @return null
                */
               if(!empty($cache_id) && has_action('alm_cache_installed') && !empty($acf_data)){
                  apply_filters('alm_cache_file', $cache_id, $page, $seo_start_page, $acf_data, $preloaded);
               }

				}
			}


			if($acf_data){
            $return = array(
               'html' => $acf_data,
               'meta'  => array(
                  'postcount' => $row_counter,
                  'totalposts' => $total
               )
            );
         } else{
            $return = array(
               'html' => '',
               'meta'  => array(
                  'postcount' => null,
                  'totalposts' => null
               )
            );

         }

         wp_send_json($return);

		}
	}
	
	wp_die();
		         
}