<?php
ob_start();
function checkUser()
{
	if (!isset($_SESSION['ch_user_id'])) {
		header('Location: '.WEB_ROOT.'myadmin/login.php');
		exit;
	}
	if (isset($_GET['logout'])) {
		doLogout();
	}
}
function doLogin()
{
	$errorMessage = '';
	$userName = $_POST['uname'];
	$password = $_POST['upass'];
	if ($userName == '') {
		$errorMessage = 'You must enter your User Name';
	} else if ($password == '') {
		$errorMessage = 'You must enter the Password';
	} else {
		$sql = "SELECT * FROM chadmin WHERE User_Name = '$userName' AND User_Password = md5('$password')";
		$result = dbQuery($sql) or die (mysql_error());
		$_SESSION['ch_user_id'] = "no user";
		if (dbNumRows($result) == 1) {
			$row = dbFetchAssoc($result);
			$_SESSION['ch_user_id'] = $row['AID'];
			$ipadd = $_SERVER['REMOTE_ADDR'];
			$sql1 = "UPDATE chadmin SET Last_Log_Date = 'NOW()' WHERE AID='{$row['AID']}'";
			dbQuery($sql1);
			if (isset($_SESSION['login_return_url'])) {
				header('Location:'.$_SESSION['login_return_url']);
				exit;
			} 
			else {
			header('Location: index.php');
			exit;
			}
		} else {
			$errorMessage = 'Wrong username or password';
		}		
	}
return $errorMessage;
}
/*
	Logout a user
*/
function doLogout()
{
	if (isset($_SESSION['ch_user_id'])) {
		unset($_SESSION['chcart_user_id']);
		session_unregister('chcart_user_id');
		unset($_SESSION['ch_user_id']);
		session_unregister($_SESSION['ch_user_id']);
	}
		
	header('Location: login.php');
	exit;
}
/*
	Generate combo box options containing the categories we have.
	if $catId is set then that category is selected
*/
function buildCategoryOptions($catId = 0)
{
	$sql = "SELECT cat_id, cat_parent_id, cat_name
			FROM tbl_category
			ORDER BY cat_id";
	$result = dbQuery($sql) or die('Cannot get Product. ' . mysql_error());
	
	$categories = array();
	while($row = dbFetchArray($result)) {
		list($id, $parentId, $name) = $row;
		
		if ($parentId == 0) {
			// we create a new array for each top level categories
			$categories[$id] = array('name' => $name, 'children' => array());
		} else {
			// the child categories are put int the parent category's array
			$categories[$parentId]['children'][] = array('id' => $id, 'name' => $name);	
		}
	}	
	
	// build combo box options
	$list = '';
	foreach ($categories as $key => $value) {
		$name     = $value['name'];
		$children = $value['children'];
		
		$list .= "<optgroup label=\"$name\">"; 
		
		foreach ($children as $child) {
			$list .= "<option value=\"{$child['id']}\"";
			if ($child['id'] == $catId) {
				$list.= " selected";
			}
			
			$list .= ">{$child['name']}</option>\r\n";
		}
		
		$list .= "</optgroup>";
	}
	
	return $list;
}
/*
	Create a thumbnail of $srcFile and save it to $destFile.
	The thumbnail will be $width pixels.
*/
function createThumbnail($srcFile, $destFile, $width, $quality = 90)
{
	$thumbnail = '';
	if (file_exists($srcFile)  && isset($destFile))
	{
		$size        = getimagesize($srcFile);
		$w           = number_format($width, 0, ',', '');
		$h           = number_format(($size[1] / $size[0]) * $width, 0, ',', '');
		
		$thumbnail =  copyImage($srcFile, $destFile, $w, $h, $quality);
	}
	
	// return the thumbnail file name on sucess or blank on fail
	return basename($thumbnail);
}

/*
	Copy an image to a destination file. The destination
	image size will be $w X $h pixels
*/
function copyImage($srcFile, $destFile, $w, $h, $quality = 90)
{
    $tmpSrc     = pathinfo(strtolower($srcFile));
    $tmpDest    = pathinfo(strtolower($destFile));
    $size       = getimagesize($srcFile);

    if ($tmpDest['extension'] == "gif" || $tmpDest['extension'] == "jpg")
    {
       $destFile  = substr_replace($destFile, 'jpg', -3);
       $dest      = imagecreatetruecolor($w, $h);
       imageantialias($dest, TRUE);
    } elseif ($tmpDest['extension'] == "png") {
       $dest = imagecreatetruecolor($w, $h);
       imageantialias($dest, TRUE);
    } else {
      return false;
    }

    switch($size[2])
    {
       case 1:       //GIF
           $src = imagecreatefromgif($srcFile);
           break;
       case 2:       //JPEG
           $src = imagecreatefromjpeg($srcFile);
           break;
       case 3:       //PNG
           $src = imagecreatefrompng($srcFile);
           break;
       default:
           return false;
           break;
    }

    imagecopyresampled($dest, $src, 0, 0, 0, 0, $w, $h, $size[0], $size[1]);

    switch($size[2])
    {
       case 1:
       case 2:
           imagejpeg($dest,$destFile, $quality);
           break;
       case 3:
           imagepng($dest,$destFile);
    }
    return $destFile;

}

/*
	Create the paging links
*/
function getPagingNav($sql, $pageNum, $rowsPerPage, $queryString = '')
{
	$result  = mysql_query($sql) or die('Error, query failed. ' . mysql_error());
	$row     = mysql_fetch_array($result, MYSQL_ASSOC);
	$numrows = $row['numrows'];
	
	// how many pages we have when using paging?
	$maxPage = ceil($numrows/$rowsPerPage);
	
	$self = $_SERVER['PHP_SELF'];
	
	// creating 'previous' and 'next' link
	// plus 'first page' and 'last page' link
	
	// print 'previous' link only if we're not
	// on page one
	if ($pageNum > 1)
	{
		$page = $pageNum - 1;
		$prev = " <a href=\"$self?page=$page{$queryString}\">[Prev]</a> ";
	
		$first = " <a href=\"$self?page=1{$queryString}\">[First Page]</a> ";
	}
	else
	{
		$prev  = ' [Prev] ';       // we're on page one, don't enable 'previous' link
		$first = ' [First Page] '; // nor 'first page' link
	}
	
	// print 'next' link only if we're not
	// on the last page
	if ($pageNum < $maxPage)
	{
		$page = $pageNum + 1;
		$next = " <a href=\"$self?page=$page{$queryString}\">[Next]</a> ";
	
		$last = " <a href=\"$self?page=$maxPage{$queryString}{$queryString}\">[Last Page]</a> ";
	}
	else
	{
		$next = ' [Next] ';      // we're on the last page, don't enable 'next' link
		$last = ' [Last Page] '; // nor 'last page' link
	}
	
	// return the page navigation link
	return $first . $prev . " Showing page <strong>$pageNum</strong> of <strong>$maxPage</strong> pages " . $next . $last; 
}
ob_flush();
?>