<?php

class Image {

	private $originalWidth = -1;
	private $originalHeight = -1;
	private $originalImage = null;
	private $image = null;
	private $filename = null;

	public function __construct($filename, $keepOriginal = false) {
		if (!file_exists($filename)) return false;
		$img_info = getimagesize($filename);
		$this->originalWidth = $img_info[0];
		$this->originalHeight = $img_info[1];
		$this->filename = $filename;
		
		
		switch(exif_imagetype($filename)){
			case IMAGETYPE_JPEG:
				$this->image = imagecreatefromjpeg($filename);
				break;
			case IMAGETYPE_PNG:
				$this->image = imagecreatefrompng($filename);
				break;
			case IMAGETYPE_GIF:
				$this->image = imagecreatefromgif($filename);
				break;
		}
		if($keepOriginal){
			$this->originalImage = clone $this->image;
		}
	}

	public function resetImage(){
		if($this->originalImage != null){
			$this->image = clone $this->originalImage;
		}
	}
	
	public function exifRotate(){
		$exif = @exif_read_data($this->filename);
		if(isset($exif) && !empty($exif['Orientation'])) {
			switch($exif['Orientation']) {
				case 2:
					imageflip($this->image, IMG_FLIP_VERTICAL);
					break;
				case 3:
					$this->image = imagerotate($this->image,180,0);
					break;
				case 4:
					imageflip($this->image, IMG_FLIP_HORIZONTAL);
					break;
				case 5:
					$this->image = imagerotate($this->image,-90,0);
					imageflip($this->image, IMG_FLIP_HORIZONTAL);
					break;
				case 6:
					$this->image = imagerotate($this->image,-90,0);
					break;
				case 7:
					$this->image = imagerotate($this->image,-90,0);
					imageflip($this->image, IMG_FLIP_VERTICAL);
					break;
				case 8:
					$this->image = imagerotate($this->image,90,0);
					break;
			}
		}
	}

	public function cover($targetSize){
	
		if($this->getWidth() > $this->getHeight()){
			$targetW = $targetSize / $this->getHeight() * $this->getWidth();
			$targetH = $targetSize;
		}else{
			$targetW = $targetSize;
			$targetH = $targetSize / $this->getWidth() * $this->getHeight();
		}
		
		$imageNew = imagecreatetruecolor($targetW, $targetH);
		
		imagecopyresampled ( $imageNew , $this->image , 0 , 0 , 0 , 0 , $targetW , $targetH , $this->getWidth() , $this->getHeight() );
		
		$this->image = $imageNew;
	}
	
	public function contain($targetSize){
	
		if($this->getWidth() < $this->getHeight()){
			$targetW = $targetSize / $this->getHeight() * $this->getWidth();
			$targetH = $targetSize;
		}else{
			$targetW = $targetSize;
			$targetH = $targetSize / $this->getWidth() * $this->getHeight();
		}
		
		$imageNew = imagecreatetruecolor($targetW, $targetH);
		
		imagecopyresampled ( $imageNew , $this->image , 0 , 0 , 0 , 0 , $targetW , $targetH , $this->getWidth() , $this->getHeight() );
		
		$this->image = $imageNew;
	}

	public function smartFaceCrop($targetSize = -1){
		if($targetSize != -1){
			$this->cover($targetSize);
		}
		
		if($this->getWidth() > $this->getHeight()){
			$x = ( $this->getWidth() - $targetSize) / 2;
			$y = 0;
		}else{
			$x = 0;
			$y = 0;
		}
		
		$imageNew = imagecreatetruecolor($targetSize, $targetSize);
		imagecopyresized ( $imageNew , $this->image , 0 , 0 , $x , $y , $targetSize ,$targetSize , $targetSize , $targetSize );
		$this->image = $imageNew;
		
	}
	
	public function getWidth(){
		return imagesx($this->image);
	}
	
	public function getHeight(){
		return imagesy($this->image);
	}
	
	public function getOriginalWidth(){
		return $this->originalWidth;
	}
	
	public function getOriginalHeight(){
		return $this->originalHeight;
	}
	
	public function outputImageFile($type = IMAGETYPE_JPEG, $quality = 100, $fileName = null){
		switch($type){
			case IMAGETYPE_JPEG:
				imagejpeg($this->image, $fileName, $quality);
				break;
			case IMAGETYPE_PNG:
				imagepng($this->image, $fileName, 9 - (($quality / 100) * 9), PNG_ALL_FILTERS);
				break;
			case IMAGETYPE_GIF:
				imagegif($this->image, $fileName);
				break;
		}
	}
	
	public function getImageObject(){
		return $this->image;
	}
}

?>