<?php
/**
 * DokuWiki Plugin watermark (Action Component)
 *
 * @license GPL 2 http://www.gnu.org/licenses/gpl-2.0.html
 * @author  Christian Moll <christian@chrmoll.de>
 */
 
if(!defined('DOKU_INC')) define('DOKU_INC',realpath(dirname(__FILE__).'/../../').'/');
if(!defined('DOKU_PLUGIN')) define('DOKU_PLUGIN',DOKU_INC.'lib/plugins/');

// must be run within Dokuwiki
if(!defined('DOKU_INC')) die();

class action_plugin_watermark_watermark extends DokuWiki_Action_Plugin {

    /**
     * Registers a callback function for a given event
     *
     * @param Doku_Event_Handler $controller DokuWiki's event controller object
     * @return void
     */
    public function register(Doku_Event_Handler $controller) {

       $controller->register_hook('MEDIA_UPLOAD_FINISH', 'AFTER', $this, 'handle_media_upload_finish');
   
    }

    /**
     * [Custom event handler which performs action]
     *
     * @param Doku_Event $event  event object by reference
     * @param mixed      $param  [the parameters passed as fifth argument to register_hook() when this
     *                           handler was registered]
     * @return void
     */

    public function handle_media_upload_finish(Doku_Event &$event, $param) {
	// get watermark either out of the template images folder or data/media folder
    $watermarkSize = array();
    $watermarkFile = tpl_getMediaFile(array(':wiki:watermark.png', ':watermark.png'), true, $watermarkSize);
    $watermark = imagecreatefrompng(str_replace(':/','://',str_replace('//','/', $watermarkFile)));
	
	$sourcefile = $event->data[1];
	$fileType = strtolower(substr($sourcefile, strlen($sourcefile)-3));
	$isWatermark = strpos($sourcefile, 'watermark.png');

	if ($isWatermark === false ) {
		switch($fileType) {
			case('gif'):
			$image = imagecreatefromgif($sourcefile);
			break;
		  
			case('png'):
			$image = imagecreatefrompng($sourcefile);
			break;
		  
			default:
			$image = imagecreatefromjpeg($sourcefile);
		}
	
		$watermark_width = imagesx($watermark);  
		$watermark_height = imagesy($watermark);  
	
		$size = getimagesize($sourcefile);
	
		$dest_x = $size[0] - $watermark_width - 5;  
		$dest_y = $size[1] - $watermark_height - 5;  
	
		imagesavealpha($image, true);
		imagealphablending($image, true);
		imagesavealpha($watermark, true);
		imagealphablending($watermark, true);
	
		imagecopy($image, $watermark, $dest_x, $dest_y, 0, 0, $watermark_width, $watermark_height);
	
		switch($fileType) {
	
		  // remember we don't need gif any more, so we use only png or jpeg.
		  // See the upsaple code immediately above to see how we handle gifs
		  case('png'):
			  imagepng($image, $sourcefile, 0);
			  break; 
		  default:
			  imagejpeg($image, $sourcefile, 90);  
		}        
	

		imagedestroy($image);  
		imagedestroy($watermark);  
		}
	}
}

// vim:ts=4:sw=4:et: