<?php
###################################
# Pagination - постраничная навигация
###################################
class Pagination {
	
		public $total;
		public $limit;
		
		
		public $_html = '';
		public $limitstart;
	
	// @ total - общее кол-во записей
	// @ limit - кол-во записей на странице
	function __construct($total, $limit = NULL, $options = array())
	{
		$options += array(
			'limitstartVar' => 'page', // название GET переменной хранящей значение страницы
			'showAnyway' => false, // показывать навигацию даже если в ней только одна страница
			'showPages' => 0 // кол-во страниц которые будут показаны в ряд ЕСЛИ "0" будут выведены все страницы
		);
		$options['showPages'] = max($options['showPages'], 0);
		
		$this->total = max((int)$total/*-$this->limit*/, 0);
		$this->limit = max((int)$limit, 0);
		
		if($this->total < 1 || $this->limit < 1)
			return null;
		
		if($this->limit > $this->total)
			$this->limit = $total;
		
		$maxpage = ceil($this->total/$this->limit);
		
		$page = (int)@$_REQUEST[$options['limitstartVar']];
		$page = max($page, 1);
		$page = min($page, $maxpage);
		
		if($this->limit == $this->total) {
			$this->limitstart = 0;
		} else {
			$this->limitstart = max($page*$this->limit-$this->limit, 0);
		}
		//vd($this->limitstart);
		
		//if($this->limitstart >= $this->total)
		//	$this->limitstart = $this->total-1;
		
		//vd($this->limitstart);
		
		// вырубаемся если у нас только одна страница
		if(!$options['showAnyway'] && $this->total == $this->limit)
			return false;
		
		$prevpage = $page - 1;
		$prevpage = max($prevpage, 1);
		
		$nextpage = $page + 1;
		$nextpage = min($nextpage, $maxpage);
		
		//////////////////
		$items = array();
		if($this->limitstart == 0) {
			$items['start'] = $this->_renderItem('item_unactive',
				array('key' => 'start', 'text'=>'&laquo;&nbsp;'.$this->getText('pagination_start'), 'current' => false)
			);
			$items['prev'] = $this->_renderItem('item_unactive',
				array('key' => 'prev', 'text'=>'<&nbsp;'.$this->getText('pagination_previous'), 'current' => false)
			);
		} else {
			$items['start'] = $this->_renderItem('item_active',
				array('key' => 'start', 'text'=>'&laquo;&nbsp;'.$this->getText('pagination_start'), 'current' => false, 'link' => $this->setLink($options['limitstartVar'], 1))
			);
			$items['prev'] = $this->_renderItem('item_active',
				array('key' => 'prev', 'text'=>'<&nbsp;'.$this->getText('pagination_previous'), 'current' => false, 'link' => $this->setLink($options['limitstartVar'], $prevpage))
			);
		}
		$items['pages'] = array();
		$start = $options['showPages']? max($page - (int)(($options['showPages']-1)/2), 1) : 1;
		$end = $options['showPages']? min($page + (int)($options['showPages']/2), $maxpage) : $maxpage;
		
		for($i = $start; $i <= $end; $i+=1) {
			if($i == $page) {
				$items['pages'][] = $this->_renderItem('item_unactive',
					array('key' => 'page', 'text'=>$i, 'current' => true)
				);
			} else {
				$items['pages'][] = $this->_renderItem('item_active',
					array('key' => 'page', 'text'=>$i, 'current' => false, 'link' => $this->setLink($options['limitstartVar'], $i))
				);
			}
		}
		if($page >= $maxpage) {
			$items['end'] = $this->_renderItem('item_unactive',
				array('key' => 'end', 'text'=>$this->getText('pagination_end').'&nbsp;&raquo;', 'current'=>false)
			);
			$items['next'] = $this->_renderItem('item_unactive',
				array('key' => 'next', 'text'=>$this->getText('pagination_next').'&nbsp;>', 'current'=>false)
			);
		} else {
			$items['end'] = $this->_renderItem('item_active',
				array('key' => 'end', 'text'=>$this->getText('pagination_end').'&nbsp;&raquo;', 'current' => false, 'link' => $this->setLink($options['limitstartVar'], $maxpage))
			);
			$items['next'] = $this->_renderItem('item_active',
				array('key' => 'next', 'text'=>$this->getText('pagination_next').'&nbsp;>', 'current' => false, 'link' => $this->setLink($options['limitstartVar'], $nextpage))
			);
		}
		$this->_html = $this->_renderItem('items_render', $items);
		
	}
	
	function getText($varName)
	{
		return $varName;
	}
	
	function setLink($var, $val)
	{
		$q = $_SERVER['QUERY_STRING'];
		parse_str($q, $q);
		$q[$var] = $val;
		$ru = $_SERVER['REQUEST_URI'];
		$ru = preg_replace('#\?.*$#s', '', $ru);
		$ru .= '?'.http_build_query($q);
		return $ru;
	}
	
	function _renderItem($itemName, $param = array())
	{
		if(function_exists('pagination_'.$itemName)) {
			return call_user_func('pagination_'.$itemName, $param);
		}
		return call_user_func(array($this, '_'.$itemName), $param);
	}
	
	function _item_active($item)
	{
		$html = '<a href="'.$item['link'].'" class="item">'.$item['text'].'</a>';
		return $html;
	}
	function _item_unactive($item)
	{
		$html = '<span class="item'.($item['current']?' current' : '').'">'.$item['text'].'</span>';
		return $html;
	}
	function _items_render($items)
	{
		$html = '<div class="pagination">';
		$html .= $items['start'];
		$html .= $items['prev'];
		foreach($items['pages'] as $page) {
			$html .= $page;
		}
		$html .= $items['next'];
		$html .= $items['end'];
		$html .= '</div>';
		return $html;
	}
	
	// вернуть хтмл код
	function getHtml()
	{
		return $this->_html;
	}
	// вернуть стартовый лимит
	function getLimitstart()
	{
		return $this->limitstart;
	}
		
}
?>