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<?php
error_reporting(E_ALL | E_STRICT);
ini_set('display_errors', true);

// <title>Navigatie Klasse</title>

include("phphulp/config.php");


class Navigation {
    // current page, total pages and pagination pages amount.
    protected $iCurrent;
    protected $iTotal;
    
    // limitation vars
    protected $iStart;
    protected $iShowRecords;
    protected $iShowNumbers;
    
    // query vars by using setQuery and setQueryCountField()
    protected $sCountQuery;
    protected $sQueryCountField = 'aantal';
    
    // query vars by using setQueryTable and setQueryWhereStatement()
    protected $sTable;
    protected $sWhereStatement;
    
    // parameter var
    protected $sGetParameter;
    
    // output vars
    protected $aPagination = array();
    protected $aToStringReplacements = array();
    protected $aWords = array('first'=>'First','prev'=>'Previous','next'=>'Next','last'=>'Last');
    protected $sToStringRegex;
    protected $aToCurrentReplacements = array('[*c]', '*c');
    protected $sSpace = '...';
    
    // construction
    public function __construct($iCurrent, $iShowRecords = 20, $iShowNumbers = 6, $sGetParameter) {
        $this->iCurrent = ($iCurrent > 1) ? (int)$iCurrent : 1;
        $this->iShowRecords = ($iShowRecords > 0) ? (int)$iShowRecords : 20;
        $this->iShowNumbers = ($iShowRecords > 0) ? (int)$iShowNumbers : 6;
        $this->iStart = ($iCurrent-1) * $iShowRecords;
        $this->sGetParameter = (string)trim($sGetParameter);
    }
    
    public function setCurrentStringRegex($sRegex, $sReplace) {
        $this->aToCurrentReplacements = array($sRegex, $sReplace);
    }
    
    // set style for the toString function.
    public function setToStringRegex($sRegex, $aReplacements) {
        $this->sToStringRegex = (string)trim($sRegex);
        $this->aToStringReplacements = $aReplacements;
    }
    
    // set ...
    public function setSpace($sString) {
        $this->sSpace = (string)trim($sString);    
    }
    
    // set words, first, next, previous, last.
    public function setWord($sEnglishWord, $sWord) {
        if($sEnglishWord == 'first') {
            $sArrayKey = 'first';        
        } else {
            $sArrayKey = substr($sEnglishWord, 0, 4);
        }
        
        $this->aWords[$sArrayKey] = trim($sWord);
    }
    
    // fill array and vars
    public function doExecute() {
        $oDatabase = new NavigationDatabase($this);
        
        if(empty($this->sCountQuery)) {
            if(!empty($this->sTable)) {
                $oDatabase->createQuery();
            } else {
                throw new Exception('First enter a table to be searched in.');
            }
        }
        
        $oDatabase->calculateTotalPages();
        $this->setNavigation();    
    }
    
    // set next page in the pagination array.
    protected function setNext() {
        if($this->iCurrent == $this->iTotal) {
            $this->aPagination['next'] = false;
        } else {
            $this->aPagination['next'] = $this->iCurrent+1;
        }
    }
    
    // set last page in the pagination array.
    protected function setLast() {
        if($this->iCurrent == $this->iTotal) {
            $this->aPagination['last'] = false;
        } else {
            $this->aPagination['last'] = $this->iTotal;
        }
    }
    
    // set previous page in the pagination array.
    protected function setPrevious() {
        if($this->iCurrent <= 1) {
            $this->aPagination['prev'] = false;
        } else {
            $this->aPagination['prev'] = $this->iCurrent-1;
        }
    }
    
    // set first page in the pagination array.
    protected function setFirst() {
        if($this->iCurrent <= 1) {
            $this->aPagination['first'] = false;
        } else {
            $this->aPagination['first'] = 1;
        }
    }
    
    // set points in the pagination array.
    protected function setSpaces() {
        $iNumbersRound = ceil($this->iShowNumbers / 2);
        
        if(($this->iCurrent - $iNumbersRound) <= 1) {
            $this->aPagination['space_before'] = false;
        } else {
            $this->aPagination['space_before'] = $this->sSpace;
        }
        
        if(($this->iCurrent + $iNumbersRound) >= $this->iTotal) {
            $this->aPagination['space_after'] = false;
        } else {
            $this->aPagination['space_after'] = $this->sSpace;
        }
    }
    
    // set the pagination numbers in the pagination array.
    protected function setNumbers() {
        $iNumbersRound = floor($this->iShowNumbers / 2);
        
        $iStart = ($this->iCurrent - $iNumbersRound) <= 1 ? 1 : ($this->iCurrent - $iNumbersRound);
        $iEnd = ($this->iCurrent + $iNumbersRound) >= $this->iTotal ? $this->iTotal : ($this->iCurrent + $iNumbersRound);
        
        for($i=$iStart;$i<=$iEnd;$i++) {
            if($i == $this->iCurrent)
                $this->aPagination['current'] = $i;
            
            $this->aPagination['numbers'][] = $i;
        }
    }
    
    // set everything by using the six functions above.
    protected function setNavigation() {
        $this->setFirst();
        $this->setLast();
        $this->setNext();
        $this->setPrevious();
        $this->setSpaces();
        $this->setNumbers();
    }
    
    // zip everything to a string, can be used by the inexperienced programmer.
    // there is also an expert version; use the stringReplacement methods to set up your own style.
    public function __toString() {
        if(!empty($this->sToStringRegex)) {
            $sString = $this->sToStringRegex;
            foreach($this->aToStringReplacements as $sRegex => $sReplace) {
                $sString = str_replace($sRegex, $sReplace, $sString);
            }
        } else {
            $aPags = NavigationOutput::getNavigation();
            $sString = '';
            
            if(is_bool(NavigationOutput::getFirst()))
                $sString .= $aWords['first'];
            else
                $sString .= '<a href="?'.$this->sGetParameter.'='.$aPags['first'].'">'.$aWords['first'].'</a> | ';
            
            if(is_bool(NavigationOutput::getPrevious()))
                $sString .= $aWords['prev'];
            else
                $sString .= '<a href="?'.$this->sGetParameter.'='.$aPags['prev'].'">'.$aWords['prev'].'</a> | ';
            
            $sString .= NavigationOutput::getSpaceBefore();
            
            foreach($aPags['numbers'] as $iNum) {
                if($iNum == NavigationOutput::getCurrent()) {
                    $sString .= ' ['.$iNum.'] ';
                } else {
                    $sString .= ' <a href="?'.$this->sGetParameter.'='.$iNum.'">'.$iNum.'</a> ';
                }
            }
            
            $sString .= NavigationOutput::getSpaceAfter();
            
            if(is_bool(NavigationOutput::getNext()))
                $sString .= $aWords['next'];
            else
                $sString .= ' | <a href="?'.$this->sGetParameter.'='.$aPags['next'].'">'.$aWords['next'].'</a>';
            
            if(is_bool(NavigationOutput::getLast()))
                $sString .= $aWords['last'];
            else
                $sString .= ' | <a href="?'.$this->sGetParameter.'='.$aPags['last'].'">'.$aWords['last'].'</a>';
        }
        
        return $sString;
    }
}

class NavigationDatabase extends Navigation {
    protected $oParent;
    
    public function __construct($oNavigation) {
        $this->oParent = $oNavigation;
    }
    
    // only use setQuery() and setQueryCountField()...
    public function setQuery($sQuery) {
        $this->oParent->sCountQuery = trim($sQuery);
    }
    
    // set fieldname which contains the query count result, standard value: aantal.
    public function setQueryCountField($sField) {
        $this->oParent->sQueryCountField = trim($sField);    
    }
    
    // ...or setQueryTable() and setQueryWhereStatement()
    public function setQueryTable($sTable) {
        $this->oParent->sTable = trim($sTable);
    }
    
    // set where statement for the query to be created with createQuery. If there's anything elses like JOINs used in the query, please use setQuery instead of these, cause setQuery is much more flexible to use with that kinds of queries.
    public function setQueryWhereStatement($sWhere) {
        $this->oParent->sWhereStatement = trim($sWhere);    
    }
    
    // only execute when setQuery() isn't used.
    protected function createQuery() {
        $this->oParent->sCountQuery = "SELECT COUNT(*) AS ".$this->oParent->sQueryCountField." FROM ".$this->oParent->sTable;
        
        if(!empty($this->oParent->sWhereStatement)) {
            $this->oParent->sCountQuery .= " WHERE ".$this->oParent->sWhereStatement;
        }
    }
    
    // calculate total pages amount.
    protected function calculateTotalPages() {
        $sResult = mysql_query($this->oParent->sCountQuery);
        if($sResult) {
            if(mysql_num_rows($sResult) > 0) {
                $sRij = mysql_fetch_assoc($sResult);
                
                $this->oParent->iTotal = ceil($sRij[$this->oParent->sQueryCountField]/$this->oParent->iShowRecords);
            } else {
                $this->oParent->iTotal = 0;            
            }
        } else {
            $this->oParent->iTotal = 0;
        }
    }
    
    // return the array, if everything completes, containing the results of the query of the showed page.
    public function getQueryResult($sQuery) {
        $sResult = mysql_query($sQuery);
        if($sResult) {
            $aReturnArray = array();
            if(mysql_num_rows($sResult) > 0) {
                while($sRij = mysql_fetch_assoc($sResult)) {
                    $aReturnArray[] = $sRij;                
                }
            }
        } else {
            throw new Exception(mysql_error().' in query: '.$sQuery);        
        }
        
        return $aReturnArray;
    }
    
    // when you create the query by your own, but not knowing how to use the LIMIT-statement, we make it for you.
    public function getLimit() {
        return ' LIMIT '.$this->oParent->iStart.','.$this->oParent->iShowRecords;
    }
}

class NavigationOutput extends Navigation {
    protected $oParent;
    
    public function __construct($oNavigation) {
        $this->oParent = $oNavigation;
    }
    
    // get the pagination array. this can also be used by the user of this class.
    public function getNavigation() {
        return $this->oParent->aPagination;    
    }
    
    public function getCurrent() {
        return str_replace($this->oParent->aToCurrentReplacements[1], $this->oParent->iCurrent, $this->oParent->aToCurrentReplacements[0]);
    }
    
    // get next page in the array.
    public function getNext() {
        if($this->oParent->aPagination['next'] === false) {
            return $this->oParent->aWords['next'];
        } else {
            return '<a href="?'.$this->oParent->sGetParameter.'='.$this->oParent->aPagination['next'].'">'.$this->oParent->aWords['next'].'</a>';        
        }
    }
    
    // get last page in the array.
    public function getLast() {
        if($this->oParent->aPagination['last'] === false) {
            return $this->oParent->aWords['last'];
        } else {
            return '<a href="?'.$this->oParent->sGetParameter.'='.$this->oParent->aPagination['last'].'">'.$this->oParent->aWords['last'].'</a>';        
        }
    }
    
    // get previous page in the array.
    public function getPrevious() {
        if($this->oParent->aPagination['prev'] === false) {
            return $this->oParent->aWords['prev'];
        } else {
            return '<a href="?'.$this->oParent->sGetParameter.'='.$this->oParent->aPagination['prev'].'">'.$this->oParent->aWords['prev'].'</a>';        
        }
    }
    
    // get first page in the array.
    public function getFirst() {
        if($this->oParent->aPagination['first'] === false) {
            return $this->oParent->aWords['first'];
        } else {
            return '<a href="?'.$this->oParent->sGetParameter.'='.$this->oParent->aPagination['first'].'">'.$this->oParent->aWords['first'].'</a>';        
        }
    }
    
    // get the pagination numbers in the array.
    public function getNumbers() {
        if(empty($this->oParent->aPagination['numbers'])) {
            return '';
        } else {
            $sString = '';
            foreach($this->oParent->aPagination['numbers'] as $sKey => $sVal) {
                if($this->oParent->iCurrent == $sVal)
                    $sString .= $this->getCurrent().' ';
                else
                    $sString .= '<a href="?'.$this->oParent->sGetParameter.'='.$sVal.'">'.$sVal.'</a> ';
            }
            return trim($sString);
        }    
    }
    
    // get the points before the numbers in the array.
    public function getSpaceBefore() {
        return $this->oParent->aPagination['space_before'];    
    }
    
    // get the points after the numbers in the array.
    public function getSpaceAfter() {
        return $this->oParent->aPagination['space_after'];    
    }
}

try {
    if(isset($_GET['pag'])) {
        $iPage = (int)$_GET['pag'];
    } else {
        $iPage = 1;
    }
    
    $oPagination = new Navigation($iPage, 5, 4, 'pag');
    $oDatabase = new NavigationDatabase($oPagination);
    $oOutput = new NavigationOutput($oPagination);
    
    $oDatabase->setQueryTable('alfabet');
    $oPagination->doExecute();
    
    $oPagination->setWord('first', 'eerste');
    $oPagination->setWord('previous', 'vorige');
    $oPagination->setWord('next', 'volgende');
    $oPagination->setWord('last', 'laatste');
    
    $oPagination->setCurrentStringRegex('[*c]', '*c');
    $oPagination->setToStringRegex('*f | *p | *sb *n *sa | *x | *l',         
        array(
            '*f'=>$oOutput->getFirst(),
            '*p'=>$oOutput->getPrevious(),
            '*sb'=>$oOutput->getSpaceBefore(),
            '*n'=>$oOutput->getNumbers(),
            '*sa'=>$oOutput->getSpaceAfter(),
            '*x'=>$oOutput->getNext(),
            '*l'=>$oOutput->getLast()
        )
    );
    
    $sQuery = "SELECT * FROM alfabet".$oDatabase->getLimit();
    $sArray = $oDatabase->getQueryResult($sQuery);
    
    if(is_array($sArray)) {
        if(!empty($sArray)) {
            foreach($sArray as $iKey => $aValue) {
                echo $aValue['id'].'. '.$aValue['letter'].'<br />';
            }
            
            echo '<div>'.$oPagination.'</div>';
        } else {
            echo 'Geen records gevonden.';    
        }
    }
} catch(Exception $e) {
    echo $e->getMessage() . $e->getLine();
}
?>

 
 

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