<?php
/*
 * ImageAdditionEvent:
 *   $user  -- the user adding the image
 *   $image -- the image being added
 *
 * An image is being added to the database
 */
class ImageAdditionEvent extends Event {
	var $user, $image;

	public function ImageAdditionEvent(User $user, Image $image) {
		$this->image = $image;
		$this->user = $user;
	}
}

class ImageAdditionException extends SCoreException {
	var $error;

	public function __construct($error) {
		$this->error = $error;
	}
}

/*
 * ImageDeletionEvent:
 *   $image -- the image being deleted
 *
 * An image is being deleted. Used by things like tags
 * and comments handlers to clean out related rows in
 * their tables
 */
class ImageDeletionEvent extends Event {
	var $image;

	public function ImageDeletionEvent(Image $image) {
		$this->image = $image;
	}
}


/*
 * ThumbnailGenerationEvent:
 * Request a thumb be made for an image
 */
class ThumbnailGenerationEvent extends Event {
	var $hash;
	var $type;

	public function ThumbnailGenerationEvent($hash, $type) {
		$this->hash = $hash;
		$this->type = $type;
	}
}


/*
 * ParseLinkTemplateEvent:
 *   $link     -- the formatted link
 *   $original -- the formatting string, for reference
 *   $image    -- the image who's link is being parsed
 */
class ParseLinkTemplateEvent extends Event {
	var $link, $original;
	var $image;

	public function ParseLinkTemplateEvent($link, Image $image) {
		$this->link = $link;
		$this->original = $link;
		$this->image = $image;
	}

	public function replace($needle, $replace) {
		$this->link = str_replace($needle, $replace, $this->link);
	}
}


/*
 * A class to handle adding / getting / removing image
 * files from the disk
 */
class ImageIO extends SimpleExtension {
	public function onInitExt($event) {
		global $config;
		$config->set_default_int('thumb_width', 192);
		$config->set_default_int('thumb_height', 192);
		$config->set_default_int('thumb_quality', 75);
		$config->set_default_int('thumb_mem_limit', parse_shorthand_int('8MB'));

		$config->set_default_bool('image_show_meta', true);
		$config->set_default_string('image_ilink', '');
		$config->set_default_string('image_tlink', '');
		$config->set_default_string('image_tip', '$tags // $size // $filesize');
		$config->set_default_string('upload_collision_handler', 'error');
	}

	public function onPageRequest($event) {
		$num = $event->get_arg(0);
		$matches = array();
		if(!is_null($num) && preg_match("/(\d+)/", $num, $matches)) {
			$num = $matches[1];

			if($event->page_matches("image")) {
				$this->send_file($num, "image");
			}
			else if($event->page_matches("thumb")) {
				$this->send_file($num, "thumb");
			}
		}
	}

	public function onImageAddition($event) {
		try {
			$this->add_image($event->image);
		}
		catch(ImageAdditionException $e) {
			throw new UploadException($e->error);
		}
	}

	public function onImageDeletion($event) {
		$event->image->delete();
	}

	public function onSetupBuilding($event) {
		$sb = new SetupBlock("Image Options");
		$sb->position = 30;
		// advanced only
		//$sb->add_text_option("image_ilink", "Image link: ");
		//$sb->add_text_option("image_tlink", "<br>Thumbnail link: ");
		$sb->add_text_option("image_tip", "Image tooltip: ");
		$sb->add_choice_option("upload_collision_handler", array('Error'=>'error', 'Merge'=>'merge'), "<br>Upload collision handler: ");
		$sb->add_bool_option("image_show_meta", "<br>Show metadata: ");
		$event->panel->add_block($sb);

		$thumbers = array();
		$thumbers['Built-in GD'] = "gd";
		$thumbers['ImageMagick'] = "convert";

		$sb = new SetupBlock("Thumbnailing");
		$sb->add_choice_option("thumb_engine", $thumbers, "Engine: ");

		$sb->add_label("<br>Size ");
		$sb->add_int_option("thumb_width");
		$sb->add_label(" x ");
		$sb->add_int_option("thumb_height");
		$sb->add_label(" px at ");
		$sb->add_int_option("thumb_quality");
		$sb->add_label(" % quality ");

		$sb->add_shorthand_int_option("thumb_mem_limit", "<br>Max memory use: ");

		$event->panel->add_block($sb);
	}


// add image {{{
	private function add_image($image) {
		global $page;
		global $user;
		global $database;
		global $config;

		/*
		 * Validate things
		 */
		if(strlen(trim($image->source)) == 0) {
			$image->source = null;
		}
		if(!empty($image->source)) {
			if(!preg_match("#^(https?|ftp)://#", $image->source)) {
				throw new ImageAdditionException("Image's source isn't a valid URL");
			}
		}

		/*
		 * Check for an existing image
		 */
		$existing = Image::by_hash($image->hash);
		if(!is_null($existing)) {
			$handler = $config->get_string("upload_collision_handler");
			if($handler == "merge") {
				$merged = array_merge($image->get_tag_array(), $existing->get_tag_array());
				send_event(new TagSetEvent($existing, $merged));
				return null;
			}
			else {
				$error = "Image <a href='".make_link("post/view/{$existing->id}")."'>{$existing->id}</a> ".
						"already has hash {$image->hash}:<p>".Themelet::build_thumb_html($existing);
				throw new ImageAdditionException($error);
			}
		}

		// actually insert the info
		$database->Execute(
				"INSERT INTO images(
					owner_id, owner_ip, filename, filesize,
					hash, ext, width, height, posted, source)
				VALUES (?, ?, ?, ?, ?, ?, ?, ?, now(), ?)",
				array($user->id, $_SERVER['REMOTE_ADDR'], $image->filename, $image->filesize,
						$image->hash, $image->ext, $image->width, $image->height, $image->source));
		$image->id = $database->db->Insert_ID();

		log_info("image", "Uploaded Image #{$image->id} ({$image->hash})");

		send_event(new TagSetEvent($image, $image->get_tag_array()));
	}
// }}}
// fetch image {{{
	private function send_file($image_id, $type) {
		global $config;
		global $database;
		$image = Image::by_id($image_id);

		global $page;
		if(!is_null($image)) {
			$page->set_mode("data");
			if($type == "thumb") {
				$page->set_type("image/jpeg");
				$file = $image->get_thumb_filename();
			}
			else {
				$page->set_type($image->get_mime_type());
				$file = $image->get_image_filename();
			}

			$page->set_data(file_get_contents($file));

			if(isset($_SERVER["HTTP_IF_MODIFIED_SINCE"])) {
				$if_modified_since = preg_replace('/;.*$/', '', $_SERVER["HTTP_IF_MODIFIED_SINCE"]);
			}
			else {
				$if_modified_since = "";
			}
			$gmdate_mod = gmdate('D, d M Y H:i:s', filemtime($file)) . ' GMT';

			// FIXME: should be $page->blah
			if($if_modified_since == $gmdate_mod) {
				header("HTTP/1.0 304 Not Modified");
			}
			else {
				header("Last-Modified: $gmdate_mod");
				header("Expires: Fri, 2 Sep 2101 12:42:42 GMT"); // War was beginning
			}
		}
		else {
			$page->set_title("Not Found");
			$page->set_heading("Not Found");
			$page->add_block(new Block("Navigation", "<a href='".make_link()."'>Index</a>", "left", 0));
			$page->add_block(new Block("Image not in database",
					"The requested image was not found in the database"));
		}
	}
// }}}
}
?>