<?php
abstract class img
{
	public static function getcoverpreview($ID,$bookpath,$comicpath)
	{
		global $_SESSION;
		if(DB::Setting("ShowCovers",$_SESSION['UID'])!=1)
		{
			return false;
		}
		$fullbookpath = $bookpath . "/$ID.jpg";
		if(!file_exists($fullbookpath))
		{
			
			$pagelist = img::pagelist($comicpath);
			
			
				if(isset($pagelist[0]->name))
				{
					$firstpage = $pagelist[0]['name'];
				}
				else
				{
					foreach($pagelist as $key=>$value)
					{
						$firstpage = $value;
						break;
					}
				}
				try{
					$fullbookpath = img::extractfrombook($comicpath,$firstpage,$bookpath,"$ID.jpg");
					$image = img::coverresize($fullbookpath,100);
					imagejpeg($image,$fullbookpath);
				}
				catch(Exception $ex)
				{
					return '<img src=\'img/nocover.png\' width = \'100px\'>';
				}
		}
		
		return "<img src='covers/$ID.jpg' width='100px' />";	
	}
	/**
 * Resizes an image if width of image is bigger than the maximum width
 * @return array the imageinfo of the resized image
 * @param $filename String The path where the image is located
 * @param $maxwidth String[optional] The maximum width the image is allowed to be
 */
	public static function resize($filename,$maxwidth="1024")
	{
		$inputfunctions = array('image/jpeg'=>'imagecreatefromjpeg',
			'image/png'=>'imagecreatefrompng',
			'image/gif'=>'imagecreatefromgif');
		$outputfunctions = array('image/jpeg'=>'imagejpeg','image/png'=>'imagepng','image/gif'=>'imagegif');
		$imageinfo = getimagesize($filename);
		$img = $inputfunctions[$imageinfo['mime']]($filename);
		$currentwidth = $imageinfo[0];
		$currentheight = $imageinfo[1];
		//$mimetype = image_type_to_mime_type(exif_imagetype($file));
		if($currentwidth < $maxwidth)
		{
			return $img;
		}
		//$img = $inputfunctions[$imageinfo['mime']]($filename);
		$newwidth = $maxwidth;
		$newheight = ($currentheight/$currentwidth)*$newwidth;
		$newimage = imagecreatetruecolor($newwidth,$newheight);
		imagecopyresampled($newimage,$img,0,0,0,0,$newwidth,$newheight,$currentwidth,$currentheight);
		return $newimage;
	}
	public static function coverresize($filename,$maxwidth="100")
	{
		$inputfunctions = array('image/jpeg'=>'imagecreatefromjpeg',
			'image/png'=>'imagecreatefrompng',
			'image/gif'=>'imagecreatefromgif');
		$outputfunctions = array('image/jpeg'=>'imagejpeg','image/png'=>'imagepng','image/gif'=>'imagegif');
		$imageinfo = getimagesize($filename);
		$currentwidth = $imageinfo[0];
		$currentheight = $imageinfo[1];
		
		$img = $inputfunctions[$imageinfo['mime']]($filename);	
		$newwidth = $maxwidth;
		$newheight = $maxheight;
		$newheight = ($currentheight/($currentwidth))*$newwidth;		
		if($currentwidth / $currentheight > 0.68)
		{
			//accomodate for crop
			$hwidth = $currentheight *0.68;
			$newheight = ($currentheight/$hwidth)*($newwidth);
			$newimage = imagecreatetruecolor($newwidth,$newheight);
			imagecopyresampled($newimage,$img,0,0,$currentwidth-$hwidth,0,$newwidth,$newheight,$hwidth,$currentheight);
		}
		else
		{
			$newimage = imagecreatetruecolor($newwidth,$newheight);
			imagecopyresampled($newimage,$img,0,0,0,0,$newwidth,$newheight,$currentwidth,$currentheight);
		}
		return $newimage;
	}
	public static function pagelist($filename)
	{
		if ((preg_match('/cbr$/i',$filename)) || (preg_match('/rar$/i',$filename))) 
		{
			$rar_file = rar_open($filepath.$filename);
			$list = rar_list($rar_file);
			sort($list);
			$new = array();
			foreach ($list as $file) 
			{				
				if (($file->unpacked_size > 0) && preg_match('/jpg|gif|png/i',$file->name)) 
				{
					$new[$file->name] = $file->name;
					//unset($list->$file);
				}
			}
			return $new;
		}
		elseif ((preg_match('/cbz$/i',$filename))||(preg_match('/zip$/i',$filename))) 
		{
			$zip = new ZipArchive();
			$zip->open($filename) or die("cannot open $filename!\n");
			if($zip->numFiles != 0)
			{
				$filelist = array();
				for ($i = 0; $i < $zip->numFiles; $i++) {
					$entry = $zip->statIndex($i);
					if (preg_match('/(jpg|png|gif)$/i',$entry['name'])) 
					{
						$filelist[$entry['name']] = $i;
					}
				}
				
				ksort($filelist);
				$zip->close();
				return $filelist;
			}
		}
		return array();
	}
	public static function extractfrombook($comicname,$pagename,$extracttopath,$extracttofile = NULL)
	{
		if($extracttofile == NULL)
		{
			$extracttofile = $pagename;
		}
		$extractto = $extracttopath . '/' . rawurlencode($extracttofile);
		
		if ((preg_match('/cbr$/i',$comicname))||(preg_match('/rar$/i',$comicname))) 
		{
			$rar_file = $pagename;
			if(!rar_open($comicname))
			{
				throw new Exception();
			}
			$rar_file = rar_open($comicname);		
			$entry = rar_entry_get($rar_file,$pagename);
			$entry->extract(false,$extractto);
			rar_close($rar_file);
		}
		elseif ((preg_match('/cbz$/i',$comicname))||(preg_match('/zip$/i',$comicname))) 
		{
			$index = $pagename;
			$zip = new ZipArchive();
			if ($zip->open($comicname) === TRUE) 
			{
				$entry = $zip->statIndex($index);
				file_put_contents($extractto,$zip->getFromIndex($index));
				$zip->close();
			}
		}	 
		else 
		{
			return false;
		}
		return $extractto;
	}
}
?>