<?php
/**************************************
 seesaw associates | http://seesaw.net
 
 client: 		general
 file: 			class.paging.php
 description: 	handles mysql paging
 
 Copyright (C) 2008 Matt Kenefick(.com)
**************************************/
 
 
class paging{
 
	var $sql_results;
	var $sql_query;
 
	var $display_offset;
	var $display_limit;
	var $display_limit_URI;
	var $display_currentpage;
	var $display_totalpages;
	var $alt_content_count;
 
	var $display_offset_var;
	var $display_limit_var;
 
	var $display_mid_offset;
	var $display_link_first;
	var $display_link_prev;
	var $display_link_next;
	var $display_link_last;
 
	var $page_filename;
	var $page_uri;
 
	var $content;
	var $content_type;
	var $content_count;
 
	## CONSTRUCTOR
	function paging($offsetVar='offset',$limit=10,$midOffset=2){
		$this->display_offset 		= isset($_REQUEST[$offsetVar])?$_REQUEST[$offsetVar]:0;
		$this->display_limit 		= is_numeric($limit)?$limit:10;
		$this->display_mid_offset 	= $midOffset;
		$this->display_offset_var 	= $offsetVar;
		$this->display_currentpage	= ceil($this->display_offset / $this->display_limit);
	}
 
	## HANDLE DATA
	function setContent($content){
		if( is_array($content) )
			$this->content_type = 'array';
 
		$this->content = $content;
		$this->private_contentDetails();
		$this->getLinks();
	}
 
	function private_contentDetails(){
		if( $this->content_type == 'array' )
			$this->content_count = count($this->content);
	}
 
	function getContent(){
		$returnAry = array();
		for(
			$i=$this->display_offset; 
			$i< min( $this->content_count, $this->display_offset+$this->display_limit );
			 ++$i
			)
			array_push($returnAry,$this->content[$i]);
 
		return $returnAry;
	}
 
	## LINKS TO NAVIGATE
	function getLinks(){
		$this->getNextLink('');
		$this->getFirstLink('');
		$this->getLastLink('');
		$this->getPrevLink('');		
	}
 
	function getNext(){
		return $this->display_link_next;
	}
 
	function getPrev(){
		return $this->display_link_prev;
	}
 
	function getFirst(){
		return $this->display_link_first;
	}
 
	function getLast(){
		return $this->display_link_last;
	}
 
	function getNextLink($caption){
		// Check if we're counting content or the alternate user provided count
		if( $this->alt_content_count )
			$count = $this->alt_content_count;
		else
			$count = $this->content_count;
 
		if( $this->display_offset+$this->display_limit-$count >=0 ){
 
			$this->display_link_next = $this->display_offset;
		}else{
			$this->display_link_next = min(
					$count-1, 
					$this->display_offset+$this->display_limit
					);
		}
		return $this->buildLink( $this->buildNewURI( $this->display_link_next), $caption );
	}
 
	function getPrevLink($caption){	
		$this->display_link_prev = max(
				0,
				$this->display_offset-$this->display_limit
				);
		return $this->buildLink( $this->buildNewURI( $this->display_link_prev), $caption );
	}
 
	function getFirstLink($caption){
		$this->display_link_first = 0;
		return $this->buildLink( $this->buildNewURI( $this->display_link_first), $caption );
	}
 
	function getLastLink($caption){
		$this->display_link_last = $this->content_count-$this->display_limit;
		return $this->buildLink( $this->buildNewURI( $this->display_link_last), $caption );
	}
 
	## NUMBERS
	function getPageCount(){
		if( $this->alt_content_count )
			$count = $this->alt_content_count;
		else
			$count = $this->content_count;
 
		$this->display_totalpages = ceil( 
								$count / $this->display_limit 
								);
		return $this->display_totalpages;
	}
 
	function getPageNumbers(){
 
		// define variables
		$midOffset 	= $this->display_mid_offset;
		$firstLink 	= $this->display_link_first;
		$pageCount 	= $this->getPageCount();
		$thisPage 	= $this->display_currentpage;
		$limit	 	= $this->display_limit;
		$displayed	=	$midOffset*2+1;
		$returnAry	=	array();
 
		// dots
		$returnAry['afterdot'] = '';
		$returnAry['beforedot'] = '';
 
 
		// if two times and center the number is less than all the pages together
		if( ($midOffset*2+1) < $pageCount ){
			$min = max($firstLink,$thisPage-$midOffset);
			$max = min($pageCount,$thisPage+$midOffset+1);
			$total = $max-$min;
 
			// this keeps x amount of pages displayed even if
			// you're not in mid cause of page 1 or 2
			if($total<$displayed){
 
				if($min==0){
					$max+=$displayed-$total;
				}
				if($max==$pageCount){
					$min-=$displayed-$total;
				}
			}
 
		}else{
			# Just output a set of numbers
			$min = 0;
			$max = $pageCount;
		}
 
		// run pages, check for current page and name it
		for($i=$min;$i<$max;++$i){
			$cp = 'no';
			if($thisPage==$i) 
				$cp = 'yes';
 
			if($max!=$pageCount)
				$returnAry['afterdot'] = '...';
 
			if($min>0)
				$returnAry['beforedot'] = '...';
 
			array_push($returnAry, 
						array(
							'currentPage'	=>	$cp,
							'pageNumber'	=>	($i+1),
							'pageLink'		=>	$this->buildLink( $this->buildNewURI( ($i*$limit) ), ($i+1) )
							)
						);					
		}
 
		return $returnAry;
 
	}
 
	function makePageNumbers($format, $pages,$boldCurrent=true,$separator=' '){
		$retPages = '';
 
	// make actual page numbers
		foreach($pages as $key => $value):
			if(is_numeric($key))
				$retPages .= ('yes'==$value['currentPage'] && $boldCurrent)?'<b>'.$value['pageLink'] .'</b>'.$separator:$value['pageLink'].$separator;
		endforeach;
 
		$format = str_replace( array('{beforedot}',
									'{afterdot}',
									'{pages}',
									'{separator}'),
								array( $pages['beforedot'],
										$pages['afterdot'],
										$retPages),
								$format);
		return $format;
	}
 
	## CHECKS
	function isFirstPage(){
		if($this->display_currentpage==0)
			return true;
		return false;
	}
	function isLastPage(){
		// add one because basis is 0, not 1
		if($this->display_currentpage+1==$this->getPageCount())
			return true;
		return false;
	}
 
	## FUNCTIONS
	function getPageName(){
		$fileName = explode('/',$_SERVER['REQUEST_URI']);
		$fileName = $fileName[count($fileName)-1];
 
		if(strpos($fileName,'?')>0) {
			$fileName = explode('?',$fileName);
			$fileName = $fileName[0];	
		}
 
		return $fileName;
	}
 
	function getCleanURI(){
		$URI = $_SERVER['REQUEST_URI'];
		if(strpos($URI,'?')>0){
			$URI = explode('?',$URI);
			$URI = $URI[1];
 
			$URI = preg_replace('/\b'.$this->display_offset_var.'\b[=0-9&]{2,20}/','',$URI);
			//$URI = preg_replace('/\b'.$this->display_limit_var.'\b[=0-9&]{2,20}/','',$URI);
 
			return $URI;
		}
		return false;
	}
 
	function buildNewURI($offset){
		$newFile = $this->getPageName() . '?' . $this->getCleanURI();
 
		$lastChar = substr($newFile,strlen($newFile)-1,1);
		if( $lastChar != '&' && $lastChar != '?' ) 
			$newFile.='&';
 
		$newFile .= $this->display_offset_var.'='.$offset.'&';
		//$newFile .= $this->display_limit_var.'='.$limit.'&';
 
		return $newFile;
	}
 
	function buildLink( $href, $caption, $target=NULL ){
		if( $target != NULL )
			$target = ' target="'.$target.'"';
		return '<a href="'.$href.'"'.$target.'>'.$caption.'</a>';
	}
 
	function encodeURI($str){
		$salt = 'falaful';
		$str = strrev($salt.$str);
		return base64_encode($str);
	}
 
	function decodeURI($str){
		$salt = 'falaful';
		$str = strrev( base64_decode($str) );
		$str = substr( $str, strlen($salt), strlen($str) );
		return $str;
	}
 
 
 
	##############
	#
	#	These functions are for inputting a query for this
	#	class to execute. The other functions will grab all
	#	x amount of rows then truncate it. These functions will
	#	only limit to whatever amount. This improves performance.
	#	Reason is so you dont grab 1,000,000 rows when you want 3.
	#
	##############
 
	function runWQuery($db, $statement, $table, $where=''){
 
		// get total rows
		$db->query( 'SELECT COUNT(*) AS count FROM '. $table . ' ' . $where );
		$db->movenext();
		$this->alt_content_count = $db->col['count'];
 
		// add limit to query
		$where .= ' LIMIT ' . $this->display_offset .', '.$this->display_limit;
 
		// save query
		$this->sql_query = $statement . ' FROM ' . $table .' '. $where;
 
		// print query
		//echo $this->sql_query;
 
		// run query
		$db->query( $this->sql_query );
		$this->sql_results = array();
 
		// save results
		while($db->movenext()){
			array_push($this->sql_results , $db->col);
		}
 
		return $this->runQueryActions();
	}
 
	function runQueryActions(){
		$this->setContent( $this->sql_results );
 
		$pages = $this->getPageNumbers();
 
		// make actual page numbers
		$retPages = $this->makePageNumbers( '{beforedot} {pages} {afterdot}', $pages, true, ' ' );
 
		// get new display
		return array(
					'content'	=>	$this->sql_results,
					'pages'		=>	$retPages
					);
	}
}
 
?>