<?php
/**
 * Name: SVG File Handler
 * Author: Shish <webmaster@shishnet.org>
 * Description: Handle SVG files
 */

class SVGFileHandler extends Extension {
	var $theme;

	public function receive_event($event) {
		if(is_null($this->theme)) $this->theme = get_theme_object("handle_svg", "SVGFileHandlerTheme");

		if(($event instanceof DataUploadEvent) && $this->supported_ext($event->type) && $this->check_contents($event->tmpname)) {
			$hash = $event->hash;
			$ha = substr($hash, 0, 2);
			if(!move_upload_to_archive($event)) return;
			send_event(new ThumbnailGenerationEvent($event->hash, $event->type));
			$image = $this->create_image_from_data("images/$ha/$hash", $event->metadata);
			if(is_null($image)) {
				$event->veto("SVG Handler failed to create image object from data");
				return;
			}
			send_event(new ImageAdditionEvent($event->user, $image));
		}

		if(($event instanceof ThumbnailGenerationEvent) && $this->supported_ext($event->type)) {
			$hash = $event->hash;
			$ha = substr($hash, 0, 2);

			global $config;

//			if($config->get_string("thumb_engine") == "convert") {
//				$w = $config->get_int("thumb_width");
//				$h = $config->get_int("thumb_height");
//				$q = $config->get_int("thumb_quality");
//				$mem = $config->get_int("thumb_max_memory") / 1024 / 1024; // IM takes memory in MB
//
//				exec("convert images/{$ha}/{$hash}[0] -geometry {$w}x{$h} -quality {$q} jpg:thumbs/{$ha}/{$hash}");
//			}
//			else {
				// FIXME: scale image, as not all boards use 192x192
				copy("ext/handle_svg/thumb.jpg", "thumbs/$ha/$hash");
//			}
		}

		if(($event instanceof DisplayingImageEvent) && $this->supported_ext($event->image->ext)) {
			$this->theme->display_image($event->page, $event->image);
		}
		
		if(($event instanceof PageRequestEvent) && ($event->page_name == "get_svg")) {
			global $database;
			$id = int_escape($event->get_arg(0));
			$image = $database->get_image($id);
			$hash = $image->hash;
			$ha = substr($hash, 0, 2);
			
			$event->page->set_type("image/svg+xml");
			$event->page->set_mode("data");
			$event->page->set_data(file_get_contents("images/$ha/$hash"));
		}
	}

	private function supported_ext($ext) {
		$exts = array("svg");
		return array_contains($exts, strtolower($ext));
	}

	private function create_image_from_data($filename, $metadata) {
		global $config;

		$image = new Image();

		$msp = new MiniSVGParser($filename);
		$image->width = $msp->width;
		$image->height = $msp->height;
		
		$image->filesize  = $metadata['size'];
		$image->hash      = $metadata['hash'];
		$image->filename  = $metadata['filename'];
		$image->ext       = $metadata['extension'];
		$image->tag_array = tag_explode($metadata['tags']);
		$image->source    = $metadata['source'];

		return $image;
	}

	private function check_contents($file) {
		if(!file_exists($file)) return false;
		
		$msp = new MiniSVGParser($file);
		return $msp->valid;
	}
}

class MiniSVGParser {
	var $valid=false, $width=0, $height=0;

	function MiniSVGParser($file) {
		$xml_parser = xml_parser_create();
		xml_set_element_handler($xml_parser, array($this, "startElement"), array($this, "endElement"));
		$this->valid = xml_parse($xml_parser, file_get_contents($file), true);
		xml_parser_free($xml_parser);
	}

	function startElement($parser, $name, $attrs) {
		if($name == "SVG") {
			$this->width = int_escape($attrs["WIDTH"]);
			$this->height = int_escape($attrs["HEIGHT"]);
		}
	}

	function endElement($parser, $name) {
	}
}

add_event_listener(new SVGFileHandler());
?>