<?php

/*=========================================================
  
 Pagination
 ----------
  
 =======================================================*/
 
	
	function mk_round_num($num, $to_nearest) {
	   /*Round fractions down (http://php.net/manual/en/function.floor.php)*/
	   return floor($num/$to_nearest)*$to_nearest;
	}
	 
	/* Function that performs a Boxed Style Numbered Pagination (also called Page Navigation). */
	if (!function_exists('mk_pagenavi')) { 
		function mk_pagenavi($query, $before = '', $after = '') {
		    
		    wp_reset_query();
		    global $wpdb, $paged;
		    
		    $pagenavi_options = array();
		    //$pagenavi_options['pages_text'] = ('Page %CURRENT_PAGE% of %TOTAL_PAGES%:');
		    $pagenavi_options['pages_text'] = ('');
		    $pagenavi_options['current_text'] = '%PAGE_NUMBER%';
		    $pagenavi_options['page_text'] = '%PAGE_NUMBER%';
		    $pagenavi_options['first_text'] = __('First Page', 'mk');
		    $pagenavi_options['last_text'] = __('Last Page', 'mk');
		    $pagenavi_options['next_text'] = __("Next", "mk");
		    $pagenavi_options['prev_text'] = __("Prev", "mk");
		    $pagenavi_options['dotright_text'] = '...';
		    $pagenavi_options['dotleft_text'] = '...';
		    $pagenavi_options['num_pages'] = 5; //continuous block of page numbers
		    $pagenavi_options['always_show'] = 0;
		    $pagenavi_options['num_larger_page_numbers'] = 0;
		    $pagenavi_options['larger_page_numbers_multiple'] = 5;
		 
		 	$output = "";
		 	
		    //If NOT a single Post is being displayed
		    /*http://codex.wordpress.org/Function_Reference/is_single)*/
		    if (!is_single()) {
		        $request = $query->request;
		        //intval - Get the integer value of a variable
		        /*http://php.net/manual/en/function.intval.php*/
		        $posts_per_page = intval(get_query_var('posts_per_page'));
		        //Retrieve variable in the WP_Query class.
		        /*http://codex.wordpress.org/Function_Reference/get_query_var*/
		        if ( get_query_var('paged') ) {
		        $paged = get_query_var('paged');
		        } elseif ( get_query_var('page') ) {
		        $paged = get_query_var('page');
		        } else {
		        $paged = 1;
		        }
		        $numposts = $query->found_posts;
		        $max_page = $query->max_num_pages;
		 
		        //empty - Determine whether a variable is empty
		        /*http://php.net/manual/en/function.empty.php*/
		        if(empty($paged) || $paged == 0) {
		            $paged = 1;
		        }
		 
		        $pages_to_show = intval($pagenavi_options['num_pages']);
		        $larger_page_to_show = intval($pagenavi_options['num_larger_page_numbers']);
		        $larger_page_multiple = intval($pagenavi_options['larger_page_numbers_multiple']);
		        $pages_to_show_minus_1 = $pages_to_show - 1;
		        $half_page_start = floor($pages_to_show_minus_1/2);
		        //ceil - Round fractions up (http://us2.php.net/manual/en/function.ceil.php)
		        $half_page_end = ceil($pages_to_show_minus_1/2);
		        $start_page = $paged - $half_page_start;
		 
		        if($start_page <= 0) {
		            $start_page = 1;
		        }
		 
		        $end_page = $paged + $half_page_end;
		        if(($end_page - $start_page) != $pages_to_show_minus_1) {
		            $end_page = $start_page + $pages_to_show_minus_1;
		        }
		        if($end_page > $max_page) {
		            $start_page = $max_page - $pages_to_show_minus_1;
		            $end_page = $max_page;
		        }
		        if($start_page <= 0) {
		            $start_page = 1;
		        }
		 
		        $larger_per_page = $larger_page_to_show*$larger_page_multiple;
		        //mk_round_num() custom function - Rounds To The Nearest Value.
		        $larger_start_page_start = (mk_round_num($start_page, 10) + $larger_page_multiple) - $larger_per_page;
		        $larger_start_page_end = mk_round_num($start_page, 10) + $larger_page_multiple;
		        $larger_end_page_start = mk_round_num($end_page, 10) + $larger_page_multiple;
		        $larger_end_page_end = mk_round_num($end_page, 10) + ($larger_per_page);
		 
		        if($larger_start_page_end - $larger_page_multiple == $start_page) {
		            $larger_start_page_start = $larger_start_page_start - $larger_page_multiple;
		            $larger_start_page_end = $larger_start_page_end - $larger_page_multiple;
		        }
		        if($larger_start_page_start <= 0) {
		            $larger_start_page_start = $larger_page_multiple;
		        }
		        if($larger_start_page_end > $max_page) {
		            $larger_start_page_end = $max_page;
		        }
		        if($larger_end_page_end > $max_page) {
		            $larger_end_page_end = $max_page;
		        }
		        if($max_page > 1 || intval($pagenavi_options['always_show']) == 1) {
		            /*http://php.net/manual/en/function.str-replace.php */
		            /*number_format_i18n(): Converts integer number to format based on locale (wp-includes/functions.php*/
		            $pages_text = str_replace("%CURRENT_PAGE%", number_format_i18n($paged), $pagenavi_options['pages_text']);
		            $pages_text = str_replace("%TOTAL_PAGES%", number_format_i18n($max_page), $pages_text);
		            $output .= $before.'<div class="pagination pagination-centered">'."\n";
		            $output .= $before.'<ul class="pageNavi">'."\n";
		 
		            if(!empty($pages_text)) {
		                $output .= '<li><span class="pages">'.$pages_text.'</span></li>';
		            }
		            //Displays a link to the previous post which exists in chronological order from the current post.
		            /*http://codex.wordpress.org/Function_Reference/previous_post_link*/
		            if ($paged > 1) {
		            $output .= '<li class="prev">' . get_previous_posts_link($pagenavi_options['prev_text']) . '</li>';
		 			}
		 			
		            if ($start_page >= 2 && $pages_to_show < $max_page) {
		                $first_page_text = str_replace("%TOTAL_PAGES%", number_format_i18n($max_page), $pagenavi_options['first_text']);
		                //esc_url(): Encodes < > & " ' (less than, greater than, ampersand, double quote, single quote).
		                /*http://codex.wordpress.org/Data_Validation*/
		                //get_pagenum_link():(wp-includes/link-template.php)-Retrieve get links for page numbers.
		                $output .= '<li><a href="'.esc_url(get_pagenum_link()).'" class="first" title="'.$first_page_text.'">1</a></li>';
		                if(!empty($pagenavi_options['dotleft_text'])) {
		                    $output .= '<li><span class="expand">'.$pagenavi_options['dotleft_text'].'</span></li>';
		                }
		            }
		 
		            if($larger_page_to_show > 0 && $larger_start_page_start > 0 && $larger_start_page_end <= $max_page) {
		                for($i = $larger_start_page_start; $i < $larger_start_page_end; $i+=$larger_page_multiple) {
		                    $page_text = str_replace("%PAGE_NUMBER%", number_format_i18n($i), $pagenavi_options['page_text']);
		                    $output .= '<li><a href="'.esc_url(get_pagenum_link($i)).'" class="single_page" title="'.$page_text.'">'.$page_text.'</a></li>';
		                }
		            }
		 
		            for($i = $start_page; $i  <= $end_page; $i++) {
		                if($i == $paged) {
		                    $current_page_text = str_replace("%PAGE_NUMBER%", number_format_i18n($i), $pagenavi_options['current_text']);
		                    $output .= '<li><span class="current">'.$current_page_text.'</span></li>';
		                } else {
		                    $page_text = str_replace("%PAGE_NUMBER%", number_format_i18n($i), $pagenavi_options['page_text']);
		                    $output .= '<li><a href="'.esc_url(get_pagenum_link($i)).'" class="single_page" title="'.$page_text.'">'.$page_text.'</a></li>';
		                }
		            }
		 
		            if ($end_page < $max_page) {
		                if(!empty($pagenavi_options['dotright_text'])) {
		                    $output .= '<li><span class="expand">'.$pagenavi_options['dotright_text'].'</span></li>';
		                }
		                $last_page_text = str_replace("%TOTAL_PAGES%", number_format_i18n($max_page), $pagenavi_options['last_text']);
		                $output .= '<li><a href="'.esc_url(get_pagenum_link($max_page)).'" class="last" title="'.$last_page_text.'">'.$max_page.'</a></li>';
		            }
		            $output .= '<li class="next">' . get_next_posts_link($pagenavi_options['next_text'], $max_page) . '</li>';
		 
		            if($larger_page_to_show > 0 && $larger_end_page_start < $max_page) {
		                for($i = $larger_end_page_start; $i <= $larger_end_page_end; $i+=$larger_page_multiple) {
		                    $page_text = str_replace("%PAGE_NUMBER%", number_format_i18n($i), $pagenavi_options['page_text']);
		                    $output .= '<li><a href="'.esc_url(get_pagenum_link($i)).'" class="single_page" title="'.$page_text.'">'.$page_text.'</a></li>';
		                }
		            }
		            $output .= '</ul>'.$after."\n";
		            $output .= '</div>'.$after."\n";
		        }
		    }
		    
		    return $output;
		}
	}