<?php 
App::import('Vendor', 'phpThumb', array('file' => 'phpThumb'.DS.'phpthumb.class.php'));

class ThumbnailHelper extends Helper	{
	
	private $php_thumb;
	private $options;
	private $tag_options;
	private $file_extension;
	private $cache_filename;
	private $error;
	
	private function init($options = array(), $tag_options = array())	{
		$this->options = $options;
		$this->tag_options = $tag_options;
		$this->set_file_extension();
		$this->set_cache_filename();
		$this->error = '';
	}
	
	private function set_file_extension()	{
		$this->file_extension = substr($this->options['src'], strrpos($this->options['src'], '.'), strlen($this->options['src']));
	}
	
	private function set_cache_filename()	{
		ksort($this->options);
		$filename_parts = array();
		$cacheable_properties = array('src', 'new', 'w', 'h', 'wp', 'hp', 'wl', 'hl', 'ws', 'hs', 'f', 'q', 'sx', 'sy', 'sw', 'sh', 'zc', 'bc', 'bg', 'fltr');
		foreach($this->options as $key => $value)	{
			if(in_array($key, $cacheable_properties))	{
				$filename_parts[$key] = $value;
			}
		}
		
		$this->cache_filename = '';
		foreach($filename_parts as $key => $value)	{
			$this->cache_filename .= $key . $value;
		}
		$this->cache_filename = $this->options['save_path'] . DS . md5($this->cache_filename) . $this->file_extension;
	}
	
	private function image_is_cached()	{
		if(is_file($this->cache_filename))	{
			return true;
		} else	{
			return false;
		}
	}
	
	private function create_thumb()	{
		$this->php_thumb = new phpThumb();
		foreach($this->php_thumb as $var => $value) {
			if(isset($this->options[$var]))	{
				$this->php_thumb->setParameter($var, $this->options[$var]);
			}
		}
		if($this->php_thumb->GenerateThumbnail()) {
			$this->php_thumb->RenderToFile($this->cache_filename);
		} else {
			$this->error = ereg_replace("[^A-Za-z0-9\/: .]", "", $this->php_thumb->fatalerror);
			$this->error = str_replace('phpThumb v1.7.8200709161750', '', $this->error);
		}
	}
	
	private function show_image_tag()	{
		if($this->error != '')	{
			$src = $this->options['error_image_path'];
			$this->tag_options['alt'] = $this->error;
		} else	{
			$src = $this->options['display_path'] . '/' . substr($this->cache_filename, strrpos($this->cache_filename, DS) + 1, strlen($this->cache_filename));
		}
		$img_tag = '<img src="' . $src . '"';
		if(isset($this->options['w']))	{
			$img_tag .= ' width="' . $this->options['w'] . '"';
		}
		if(isset($this->options['h']))	{
			$img_tag .= ' height="' .  $this->options['h'] . '"';
		}
		foreach($this->tag_options as $key => $value)	{
			$img_tag .= ' ' . $key . '="' . $value . '"';
		}
		$img_tag .=  ' />';
		
		echo $img_tag;
	}
	
	public function show($options = array(), $tag_options = array())	{
		$this->init($options, $tag_options);
		if($this->image_is_cached())	{
			$this->show_image_tag();
		} else	{
			$this->create_thumb();
			$this->show_image_tag();
		}
	}
	
}
?>