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<?php
/*
 * Copyright (c) 2011 - OpenSLX GmbH, RZ Uni Freiburg
 * This program is free software distributed under the GPL version 2.
 * See http://gpl.openslx.org/
 *
 * If you have any feedback please consult http://feedback.openslx.org/ and
 * send your suggestions, praise, or complaints to feedback@openslx.org
 *
 * General information about OpenSLX can be found at http://openslx.org/
 */

class Pbs_Pagination{

	private $element;
	private $perpage;
	private $requestpage;
	private $maxNumber;
	private $numpages;
	private $pageUrl;
	
	public function pagination($url=null,$selected=null,$max=null){
		if($selected == null)
			$selected = $this->requestpage;
		if($max == null)
			$max = $this->numpages;
		if($url == null)
			$url = $this->pageUrl;
			
		#print_a($url,$selected,$max);
		
		$str = "<div class='pbs_pagination'>";
		if ( 1 <= $selected){
			$str .= "<a href='$url/page/0' >&lt;&lt;</a>";
			$str .= "<a href='$url/page/".(($selected)-1)."' rel='next'>&lt;</a>";
		}else{
			 $str .= "<span class='disabled'>&lt;&lt;</span>"; 
			  $str .= "<span class='disabled'>&lt;</span>";  
		}
		
		#
		$rightleft = 2;
		for($i=0;$i<($max);$i++){			
			if($selected == $i)
					$str .= "<a class='active'>".($i+1) ."</a> ";
			else if($i >= $selected -$rightleft && $i <= $selected+$rightleft)
					$str .= "<a href='$url/page/".($i)."'>".($i+1) ."</a> ";
		}	
			
		#
		if ( $max-2 >= $selected){
			$str .= "<a href='$url/page/".(($selected)+1)."'>&gt;</a> ";			
			$str .= "<a href='$url/page/".($max-1)."'>&gt;&gt;</a> ";
		}else{
			$str .= "<span class='disabled'>&gt;</span> ";
			$str .= "<span class='disabled'>&gt;&gt;</span> ";
		}
		
		$str .= "</div>";
		return $str;
	}
	public function setPerPage($perpage){
		$this->perpage = $perpage;
	}
	public function getPerPage(){
		return $this->perpage;
	}
	public function setRequestPage($requestpage){
		if($requestpage < 0 || !is_numeric($requestpage) )
			$requestpage = 0;
		if($requestpage >= $this->numpages)
			$requestpage = $this->numpages-1;
		$this->requestpage = $requestpage;
	}
	public function getRequestPage(){
		return $this->requestpage;
	}
	public function setElement($element){
		$this->element = $element;
		$this->maxNumber = count($element);
		$this->numpages = ceil(count($element)/$this->perpage);
	}
	public function getStartItem(){
		return $this->requestpage * $this->perpage;
	}
	public function getElements(){
		return array_slice($this->element,$this->getStartItem(),$this->getPerPage(),true);
	}
	public function setPageUrl($url){
		$this->pageUrl = $url;
	}
	
}