<?php
/**
 * @Class			Resize
 * @Author			Ravi Khare
 * @Version			1.0
 * @Date			
 * @Purpose   		Resizes and saves image
 * @Requires		Requires PHP5, GD library.
 * @Usage Example	include("catabatic/imageresize.php");
 *                  $ResizeObj = new resize('images/temp/input.jpg');
 *                  $ResizeObj -> resizeImage(150, 100, 0);
 *                  $ResizeObj -> saveImage('images/upload/output.jpg', 100);
 */
 
class Catabatic_Imageresize extends Zend_Controller_Plugin_Abstract 
{
	#Class variables
	private $image;
	private $width;
	private $height;
	private $imageResized;
	
	/**
	 * Class constructor
	 * @param	string	fileName
	 * @param	void
	 */
	function __construct($fileName)
	{ 
            //echo $fileName;exit;
            #Open up the file
            $this->image = $this->openImage($fileName);

            #Get width and height
            $this->width  = imagesx($this->image);
            $this->height = imagesy($this->image);
	}
	
	/**
	 * This function is used to create image
	 * @param	string	file
	 * @param	resource
	 */
	private function openImage($file)
	{
            #Get extension
            $extension = strtolower(strrchr($file, '.'));

            switch($extension)
            {
                case '.jpg':
                case '.jpeg':
                        $img = @imagecreatefromjpeg($file);
                        break;
                case '.gif':
                        $img = @imagecreatefromgif($file);
                        break;
                case '.png':
                        $img = @imagecreatefrompng($file);
                        break;
                default:
                        $img = false;
                        break;
            }
            return $img;
	}
	
	/**
	 * This function is used to resize the image
	 * @param	integer		newWidth
	 * @param	integer		newHeight
	 * @param	string		option
	 * @return	void
	 */
	public function resizeImage($newWidth, $newHeight, $option="auto")
	{
            #Get optimal width and height - based on $option
            $optionArray = $this->getDimensions($newWidth, $newHeight, $option);

            $optimalWidth  = $optionArray['optimalWidth'];
            $optimalHeight = $optionArray['optimalHeight'];


            #Resample - create image canvas of x, y size
            $this->imageResized = imagecreatetruecolor($optimalWidth, $optimalHeight);
            imagecopyresampled($this->imageResized, $this->image, 0, 0, 0, 0, $optimalWidth, $optimalHeight, $this->width, $this->height);


            #If option is 'crop', then crop too
            if ($option == 'crop') {
                    $this->crop($optimalWidth, $optimalHeight, $newWidth, $newHeight);
            }
	}
	
	/**
	 * This function is used to create new dimension of an image
	 * @param	integer		newWidth
	 * @param	integer		newHeight
	 * @param	string		option
	 * @return	array
	 */
	private function getDimensions($newWidth, $newHeight, $option)
	{
	   switch ($option)
            {
                case 'exact':
                        $optimalWidth = $newWidth;
                        $optimalHeight= $newHeight;
                        break;
                case 'portrait':
                        $optimalWidth = $this->getSizeByFixedHeight($newHeight);
                        $optimalHeight= $newHeight;
                        break;
                case 'landscape':
                        $optimalWidth = $newWidth;
                        $optimalHeight= $this->getSizeByFixedWidth($newWidth);
                        break;
                case 'auto':
                        $optionArray = $this->getSizeByAuto($newWidth, $newHeight);
                        $optimalWidth = $optionArray['optimalWidth'];
                        $optimalHeight = $optionArray['optimalHeight'];
                        break;
                case 'crop':
                        $optionArray = $this->getOptimalCrop($newWidth, $newHeight);
                        $optimalWidth = $optionArray['optimalWidth'];
                        $optimalHeight = $optionArray['optimalHeight'];
                        break;
            }
            return array('optimalWidth' => $optimalWidth, 'optimalHeight' => $optimalHeight);
	}
	
	/**
	 * This function is used to get width according to fix height 
	 * @param	integer		newHeight
	 * @return	integer		newWidth
	 */
	private function getSizeByFixedHeight($newHeight)
	{
            $ratio = $this->width / $this->height;
            $newWidth = $newHeight * $ratio;
            return $newWidth;
	}
	
	/**
	 * This function is used to get height according to fix width 
	 * @param	integer		newWidth
	 * @return	integer		newHeight
	 */
	private function getSizeByFixedWidth($newWidth)
	{
            $ratio = $this->height / $this->width;
            $newHeight = $newWidth * $ratio;
            return $newHeight;
	}	
	
	/**
	 * This function is used to get new widht and height according to width and height
	 * @param	integer		newWidth
	 * @param	integer		newHeight
	 * @return	array
	 */
	private function getSizeByAuto($newWidth, $newHeight)
	{
            if ($this->height < $this->width)
            {
                #Image to be resized is wider (landscape)
                $optimalWidth = $newWidth;
                $optimalHeight= $this->getSizeByFixedWidth($newWidth);
            }
            elseif ($this->height > $this->width)
            {
                #Image to be resized is taller (portrait)
                $optimalWidth = $this->getSizeByFixedHeight($newHeight);
                $optimalHeight= $newHeight;
            }
            else
            {
                #Image to be resizerd is a square
                if ($newHeight < $newWidth) {
                        $optimalWidth = $newWidth;
                        $optimalHeight= $this->getSizeByFixedWidth($newWidth);
                } else if ($newHeight > $newWidth) {
                        $optimalWidth = $this->getSizeByFixedHeight($newHeight);
                        $optimalHeight= $newHeight;
                } else {
                        #Sqaure being resized to a square
                        $optimalWidth = $newWidth;
                        $optimalHeight= $newHeight;
                }
            }

            return array('optimalWidth' => $optimalWidth, 'optimalHeight' => $optimalHeight);
	}
	
	/**
	 * This function is used to return dimension for image cropping
	 * @param	integer		newWidth
	 * @param	integer		newHeight
	 * @return	array
	 */
	private function getOptimalCrop($newWidth, $newHeight)
	{
            $heightRatio = $this->height / $newHeight;
            $widthRatio  = $this->width /  $newWidth;

            if ($heightRatio < $widthRatio) {
                $optimalRatio = $heightRatio;
            } else {
                $optimalRatio = $widthRatio;
            }

            $optimalHeight = $this->height / $optimalRatio;
            $optimalWidth  = $this->width  / $optimalRatio;

            return array('optimalWidth' => $optimalWidth, 'optimalHeight' => $optimalHeight);
	}
	
	/**
	 * This function is used to crop image
	 * @param	integer	optimalWidth
	 * @param	integer	optimalHeight
	 * @param	integer	newWidth
	 * @param	integer	newHeight
	 * @return	void
	 */
	private function crop($optimalWidth, $optimalHeight, $newWidth, $newHeight)
	{
            #Find center - this will be used for the crop
            $cropStartX = ( $optimalWidth / 2) - ( $newWidth /2 );
            $cropStartY = ( $optimalHeight/ 2) - ( $newHeight/2 );

            $crop = $this->imageResized;
            #imagedestroy($this->imageResized);

            #Now crop from center to exact requested size
            $this->imageResized = imagecreatetruecolor($newWidth , $newHeight);
            imagecopyresampled($this->imageResized, $crop , 0, 0, $cropStartX, $cropStartY, $newWidth, $newHeight , $newWidth, $newHeight);
	}
	
	/**
	 * This function is used to save image to destination folder
	 * @param	string	savePath
	 * @param	string	imageQuality
	 * @return	void
	 */
	public function saveImage($savePath, $imageQuality="100")
	{
            #Get extension
            $extension = strrchr($savePath, '.');
            $extension = strtolower($extension);

            switch($extension)
            {
                case '.jpg':
                case '.jpeg':
                    if (imagetypes() & IMG_JPG) {
                            imagejpeg($this->imageResized, $savePath, $imageQuality);
                    }
                    break;

                case '.gif':
                    if (imagetypes() & IMG_GIF) {
                            imagegif($this->imageResized, $savePath);
                    }
                    break;

                case '.png':
                    #Scale quality from 0-100 to 0-9
                    $scaleQuality = round(($imageQuality/100) * 9);

                    #Invert quality setting as 0 is best, not 9
                    $invertScaleQuality = 9 - $scaleQuality;

                    if (imagetypes() & IMG_PNG) {
                             imagepng($this->imageResized, $savePath, $invertScaleQuality);
                    }
                    break;
                default:
                    #No extension - No save.
                    break;
            }
            imagedestroy($this->imageResized);
	}
        
}