<?php

/*
	Handles all tasks regarding the cropping and recreating of an image
*/

class Image_Cropper
{
	private $_src,
			$_name,
			$_uploadTarget,
			$_manual,
	
			$_trgtW,
			$_trgtH,
	
			$_srcW,
			$_srcH,
			$_srcX,
			$_srcY, 
	
			$_dstW,
			$_dstH,
			$_dstX,
			$_dstY;
	
	public function __construct($src, $name, $manual = FALSE)
	{
		$this->_src = $src;
		$this->_name = $name;
		$this->_manual = $manual;
		
		list($this->_srcW, $this->_srcH) = getimagesize($this->_src);
		$this->_uploadTarget = DOCUMENT_UPLOADS_ROOT;

		$this->_srcX = $this->_srcY = $this->_dstX = $this->_dstY = $this->_dstW = $this->_dstH = 0;
	}
	

	/*
		
		GET / SET
	
	*/
	
	
	/**
	* Sets the name of the image
	*
	* @access public
	* @param string
	* @return null
	*/
	public function setName($input)
	{
		if(is_string($input))
		{
			$this->_name = $input;
		}
	}
	
	/**
	* Sets the variable to crop manual or automatic
	*
	* @access public
	* @param boolean
	* @return null
	*/
	public function setManual($input)
	{
		if(is_bool($input))
		{
			$this->_manual = $input;
		}
	}
	
	/**
	* Sets the width and height of the destination image
	*
	* @access public
	* @param int, int
	* @return null
	*/
	public function setSides($intW, $intH)
	{
		$this->_trgtW = $intW;
		$this->_trgtH = $intH;
	}
	
	public function setSrcSides($intW, $intH)
	{
		$this->_srcW = $intW;
		$this->_srcH = $intH;
	}
	
	/**
	* Sets the x and y of the source image
	*
	* @access public
	* @param int, int
	* @return null
	*/
	public function setSrcPosition($intX, $intY)
	{
		if(is_numeric($intX) && is_numeric($intY))
		{
			$this->_srcX = $intX;
			$this->_srcY = $intY;
		}
	}
	
	/**
	* Sets the x and y of the destination image
	*
	* @access public
	* @param int, int
	* @return null
	*/
	public function setDstPosition($intX, $intY)
	{
		if(is_numeric($intX) && is_numeric($intY))
		{
			$this->_dstX = $intX;
			$this->_dstY = $intY;
		}
	}
	
	
	/*
		
		IMAGE HANDLING
	
	*/
	
	
	/**
	* Creates the image
	*
	* @access public 
	* @param  
	* @return string
	*/
	public function createImage()
	{		
		if( ! $this->_manual){
			$this->calculateCrop();
		}
		else{
			$this->_dstW = $this->_trgtW;
			$this->_dstH = $this->_trgtH;
		}
		
		$temp = explode('.', $this->_src);
		$fileExt = strtolower($temp[(count($temp) - 1)]);
			
		switch($fileExt){
			case 'jpg':	
			case 'jpeg':	
				$img_raw = imagecreatefromjpeg($this->_src); 
			break;
			case 'png':	
				$img_raw = imagecreatefrompng($this->_src); 
			break;
			case 'gif':	
				$img_raw = imagecreatefromgif($this->_src); 
			break;
		}		
			
		$dst_r = imagecreatetruecolor($this->_trgtW, $this->_trgtH);
		imagealphablending($dst_r, FALSE);
		imagesavealpha($dst_r, TRUE);	
		
		//echo $dst_r.', '.$img_raw.', dstX:'. $this->_dstX.', dstY:'. $this->_dstY.', srcX:'. $this->_srcX.', srcY:'. $this->_srcY.', dstW:'. $this->_dstW.', dstH:'. $this->_dstH.', srcW:'. $this->_srcW.', srcH:'. $this->_srcH; 
		
		imagecopyresampled($dst_r, $img_raw, $this->_dstX, $this->_dstY, $this->_srcX, $this->_srcY, $this->_dstW, $this->_dstH, $this->_srcW, $this->_srcH ); 
		
		$path = $this->_uploadTarget.urlencode($this->_name);
		
		$valid = FALSE;
		if($fileExt == 'png' || $fileExt == 'gif')
		{
			if(imagepng($dst_r, $path, 8))
			{ 
				$valid = TRUE; 
			}
		}
		else if(imagejpeg($dst_r, $path, 90))
		{
			$valid = TRUE; 
		}
		
		return $valid;
	}
	
	private function calculateCrop()
	{
		// option 1; crop by width and height
	
		if( ! empty($this->_trgtW) && ! empty($this->_trgtH))
		{
			if( ($this->_srcW / $this->_srcH) > ($this->_trgtW / $this->_trgtH) )
			{
				// dst image is less wide then src image
				if($this->_trgtH <= $this->_srcH){ 
					$this->_dstH = $this->_trgtH;
					$this->_dstW = ceil(($this->_dstH * $this->_srcW) / $this->_srcH);
				}
				else{
					// if target is larger then source, don't scale up
				 
				 	// don't scale height
					$this->_dstH = $this->_trgtH = $this->_srcH; 
					
					if($this->_trgtW > $this->_srcW){
						// don't scale with
						$this->_dstW = $this->_trgtW = $this->_srcW;
					}
					else{ 
						$this->_dstW = ceil( ($this->_dstH * $this->_srcW) / $this->_srcH );
					}
				}
				$this->_dstX = ceil( ($this->_dstW - $this->_trgtW) / -2 );
				$this->_dstY = 0;
			}
			else{
			
				// dst image is wider then src image
			
				if($this->_trgtW <= $this->_srcW){ 
					$this->_dstW = $this->_trgtW; 
					$this->_dstH = ceil( ($this->_dstW * $this->_srcH) / $this->_srcW );
				}
				else{ 
					// if target is larger then source, don't scale up
					
					// don't scale width
					$this->_dstW = $this->_trgtW = $this->_srcW;
					
					if($this->_trgtH > $this->_srcH){
						// don't scale height
						$this->_dstH = $this->_trgtH = $this->_srcH;
					}
					else{
						$this->_dstH = ceil( ($this->_dstW * $this->_srcH) / $this->_srcW );
					}
				}
								
				$this->_dstX = 0;
				$this->_dstY = ceil( ( $this->_dstH - $this->_trgtH ) / -2); 
			}
		}
		
		// option 2; crop by width
		
		else if ( ! empty($this->_trgtW) && empty($this->_trgtH))
		{
			if($this->_trgtW <= $this->_srcW) 
			{ 
				$this->_dstW = $this->_trgtW; 
			}
			else
			{ 
				$this->_dstW = $this->_trgtW = $this->_srcW;
			}
			$this->_dstH = $this->_trgtH = ceil( ($this->_dstW * $this->_srcH) / $this->_srcW); 
			
			$this->_dstX = 0;
			$this->_dstY = 0;	
		}
		
		// option 3; crop by height
		
		else if (empty($this->_trgtW) && ! empty($this->_trgtH))
		{
			if($this->_trgtH <= $this->_srcH) 
			{ 
				$this->_dstH = $this->_trgtH; 
			}
			else
			{ 
				$this->_dstH = $this->_trgtH = $this->_srcH;
			}
			
			$this->_dstW = $this->_trgtW = ceil( ($this->_dstH * $this->_srcW) / $this->_srcH);
			$this->_dstX = 0;
			$this->_dstY = 0;	
		}
		
		// option 4; don't crop
		
		else if (empty($this->_trgtW) && empty($this->_trgtH))
		{
			$this->_dstW = $this->_trgtW = $this->_srcW;
			$this->_dstH = $this->_trgtH = $this->_srcH;
			$this->_dstX = 0;
			$this->_dstY = 0;	
		}	
	}	
}