<?php
	namespace Evilworlds\View\Widgets; 
	use \Evilworlds\Text\Url; 
	
	class Pagination extends \Evilworlds\View\Widget {
		private $page = 1; 
		public function __construct($args = NULL) {
			$this -> set([
				'total'     => 0, 
				'arg_name'  => 'p', 
				'per_page'  => 10, 
				'url'       => '', 
				'neighbors' => 10, 
			]); 
			parent::__construct($args); 
			$this -> page = array_var($_GET, $this -> fields['arg_name'], 0); 
		}
		
		public function getPage() {
			return max(1, min($this -> getTotalPages(), $this -> page)); 
		}
		
		public function getLimit() {
			return $this -> fields['per_page']; 
		}
		
		public function getTotalPages() {
			return ceil($this -> fields['total'] / $this -> fields['per_page']); 
		}
		
		public function getTotal() {
			return $this -> fields['total']; 
		}
		
		public function getOffset() {
			return ($this -> getPage() - 1) * $this -> fields['per_page']; 
		}
		
		public function render() {
			$page = $this -> getPage(); 
			
			$prev_link = new Url($this -> fields['url']); 
			$prev_link[$this -> fields['arg_name']] = $page - 1; 
			
			$page_link = new Url($this -> fields['url']); 
			$pages = []; 
			
			// Ссылка на первую страницу
			if ($page > 1) {
				$page_link[$this -> fields['arg_name']]         = 1; 
				$pages[] = ['name' => 1, 'link' => $page_link -> getUrl()]; 
			}
			
			// Страницы слева активной
			if ($page - 1 > $this -> fields['neighbors'] + 1)
				$pages[] = ['name' => '...']; 
			$min_page = max(2, $page - $this -> fields['neighbors']); 
			for ($i = $min_page; $i < $page; $i++) {
				$page_link[$this -> fields['arg_name']]         = $i; 
				$pages[] = ['name' => $i, 'link' => $page_link -> getUrl()]; 
			}
			
			// Текущая страничка
			$pages[] = ['name' => $page, 'curr' => true]; 
			
			// Страницы справа активной
			$max_page = min($this -> getTotalPages() - 1, $page + $this -> fields['neighbors']); 
			for ($i = $page + 1; $i <= $max_page; $i++) {
				$page_link[$this -> fields['arg_name']]         = $i; 
				$pages[] = ['name' => $i, 'link' => $page_link -> getUrl()]; 
			}
			if ($page < $this -> getTotalPages() - $this -> fields['neighbors'] - 1)
				$pages[] = ['name' => '...']; 
			
			// Ссылка на последнюю страницу
			if ($page < $this -> getTotalPages()) {
				$page_link[$this -> fields['arg_name']] = $this -> getTotalPages(); 
				$pages[] = ['name' => $this -> getTotalPages(), 'link' => $page_link -> getUrl()]; 
			}
			
			$next_link = new Url($this -> fields['url']); 
			$next_link[$this -> fields['arg_name']] = $page + 1; 
			
			$tpl = \Evilworlds\View\Template::getInstance(); 
			$data = $tpl -> render("widgets/pagination.xhtml", [
				'total'     => $this -> getTotalPages(), 
				'curr_page' => $page, 
				'pages'     => $pages, 
				'next_link' => $next_link -> getUrl(), 
				'prev_link' => $prev_link -> getUrl(), 
			]); 
			unset($pages); 
			return $data; 
		}
	}