<?php
/**
 * Core API file, includes pagination utility
 * 
 * © Copyright 2021  Website Experts Inc./ DBA Buy Now Depot®
 * Trademark Registered Number:  5,442,029
 * @author BuyNowDepot
 * @link              https://buynowdepot.com
 * @since             1.0.0
 * @package           Bnd_Flex_Order_Delivery/api
 */

// page given in URL parameter, default page is one
$page = isset($_GET['page']) ? sanitize_text_field($_GET['page']) : 1;
// set number of records per page
$records_per_page = 25;
// calculate for the query LIMIT clause
$from_record_num = ($records_per_page * $page) - $records_per_page;

class Utilities{
    
    public function getPaging($page, $total_rows, $records_per_page, $page_url){
        
        // paging array
        $paging_arr=array();
        
        // button for first page
        $paging_arr["first"] = $page>1 ? "{$page_url}page=1" : "";
        
        // count all products in the database to calculate total pages
        $total_pages = ceil($total_rows / $records_per_page);
        
        // range of links to show
        $range = 2;
        
        // display links to 'range of pages' around 'current page'
        $initial_num = $page - $range;
        $condition_limit_num = ($page + $range)  + 1;
        
        $paging_arr['pages']=array();
        $page_count=0;
        
        for($x=$initial_num; $x<$condition_limit_num; $x++){
            // be sure '$x is greater than 0' AND 'less than or equal to the $total_pages'
            if(($x > 0) && ($x <= $total_pages)){
                $paging_arr['pages'][$page_count]["page"]=$x;
                $paging_arr['pages'][$page_count]["url"]="{$page_url}page={$x}";
                $paging_arr['pages'][$page_count]["current_page"] = $x==$page ? "yes" : "no";
                
                $page_count++;
            }
        }
        
        // button for last page
        $paging_arr["last"] = $page<$total_pages ? "{$page_url}page={$total_pages}" : "";
        
        // json format
        return $paging_arr;
    }
    
}
?>