<?php 
class ImageHelper extends Helper {

    var $helpers = array('Html');
	
	var $cacheDir = 'imagecache'; // relative to IMAGES_URL path
	
/**
 * Automatically resizes an image and returns formatted IMG tag
 *
 * @param string $path Path to the image file, relative to the webroot/img/ directory.
 * @param integer $width Image of returned image
 * @param integer $height Height of returned image
 * @param boolean $aspect Maintain aspect ratio (default: true)
 * @param array	$htmlAttributes Array of HTML attributes.
 * @param boolean $return Wheter this method should return a value or output it. This overrides AUTO_OUTPUT.
 * @return mixed	Either string or echos the value, depends on AUTO_OUTPUT and $return.
 * @access public
 */
	function resize($path, $width, $height, $aspect = true, $htmlAttributes = array(), $return = false) {
		
		$types = array(1 => "gif", "jpeg", "png", "swf", "psd", "wbmp"); // used to determine image type
		
		$fullpath = ROOT.DS.APP_DIR.DS.WEBROOT_DIR.DS.$this->themeWeb.IMAGES_URL;
	
		$url = $fullpath.$path;
		
		if (!($size = getimagesize($url))) 
			return; // image doesn't exist
			
		if ($aspect) { // adjust to aspect.
			if (($size[1]/$height) > ($size[0]/$width))  // $size[0]:width, [1]:height, [2]:type
				$width = ceil(($size[0]/$size[1]) * $height);
			else 
				$height = ceil($width / ($size[0]/$size[1]));
		}
		
		
		$relfile = $this->webroot.$this->themeWeb.IMAGES_URL.$this->cacheDir.'/'.$width.'x'.$height.'_'.basename($path); // relative file
		$cachefile = $fullpath.$this->cacheDir.DS.$width.'x'.$height.'_'.basename($path);  // location on server
		
		if (file_exists($cachefile)) {
			$csize = getimagesize($cachefile);
			$cached = ($csize[0] == $width && $csize[1] == $height); // image is cached
			if (@filemtime($cachefile) < @filemtime($url)) // check if up to date
				$cached = false;
		} else {
			$cached = false;
		}
		
		if (!$cached) {
			$resize = ($size[0] > $width || $size[1] > $height) || ($size[0] < $width || $size[1] < $height);
		} else {
			$resize = false;
		}
		
		if ($resize) {
			$image = call_user_func('imagecreatefrom'.$types[$size[2]], $url);
			if (function_exists("imagecreatetruecolor") && ($temp = imagecreatetruecolor ($width, $height))) {
				imagecopyresampled ($temp, $image, 0, 0, 0, 0, $width, $height, $size[0], $size[1]);
	  		} else {
				$temp = imagecreate ($width, $height);
				imagecopyresized ($temp, $image, 0, 0, 0, 0, $width, $height, $size[0], $size[1]);
			}
			call_user_func("image".$types[$size[2]], $temp, $cachefile);
			imagedestroy ($image);
			imagedestroy ($temp);
		} 		
		
		return $this->output(sprintf($this->Html->tags['image'], $relfile, $this->Html->parseHtmlOptions($htmlAttributes, null, '', ' ')), $return);
	}
?>