<?php 
/*
author:vimal peramangalath
email:hide@address.com
*/
class Pagination
{
	private $TotalPages;
	private $TotalRows;
	private	$RowPerPage;
	private $CurrentPage;
	private $Url;

	function pagination($url="#",$total_rows=0,$rowsPerPage=100)
	{
		$this->Url=$url;
		$this->TotalRows=$total_rows;		
		$this->RowPerPage=$rowsPerPage;
		$this->getTotalPages();	

	}

	function displayPageLinks()
	{
		
	$density=$this->findDensity(5);

	$PageLInks="";

	if($density["first_page"])

	$PageLInks.="<a href= \" $this->Url?page= $density[first_page] \" class='button-blue'><span id=\"first_page\">First</span></a> <span>....</span>";		

	

		for($i=(int)$density["start_page"];$i<=(int)$density["end_page"];$i++)
		{
			if($this->CurrentPage == $i)		
			$PageLInks.="<span class='currentpage'>$i</span>";  				
			else
			$PageLInks.="<a href= \" $this->Url?page=$i\"><span>$i</span></a>";  				
	
		}


	if($density["last_page"])
		$PageLInks.="<span>....</span> <a href= \" $this->Url?page= $density[last_page] \" class='button-blue'><span id=\"last_page\">Last</span></a>";		


	return $PageLInks;
	}

	function getCurrentStartRecordNo($pageNo=1)
	{

		if((int)$pageNo < 1)$pageNo=1;
		if((int)$pageNo > $this->TotalPages)$pageNo = $this->TotalPages;
		$this->CurrentPage = $pageNo;//assigning for display links.
		return (int)($this->CurrentPage * $this->RowPerPage) - (int)( $this->RowPerPage);
				
	}

	private function getTotalPages()
	{
		$this->TotalPages = (int)ceil($this->TotalRows/$this->RowPerPage);		

	}
	private function findDensity($densityFactor=5)
	{
		$start = 1;
		$first = $start;
		$last = $this->TotalPages;
		$cur = $this->CurrentPage; 		
		$end = $last;
		
		((int)($cur+intval($densityFactor))>= $end)?$end=$last:$end=(int)$cur+$densityFactor;
		((int)($cur-intval($densityFactor))<= (int)$start)?$start=$first:$start=(int)$cur-$densityFactor;		

		
		($first==$start)?$first=(boolean)false:0;
		($end==$last)?$last=(boolean)false:0;

		return array("first_page"=>$first,"last_page"=>$last,
			     "start_page"=>$start,"end_page"=>$end);
		
	}


}