import flash.external.ExternalInterface;

class ExternalCall
{
	
	/*public function ExternalCall()
	{

	}
	*/
	
	public static function Simple(callback:String):Void {
		ExternalInterface.call(callback);
	}
	public static function FileQueued(callback:String, file_object:Object):Void {
		ExternalInterface.call(callback, EscapeMessage(file_object));
	}
	public static function FileQueueError(callback:String, error_code:Number, file_object:Object, message:String):Void {
		
		ExternalInterface.call(callback, EscapeMessage(file_object), EscapeMessage(error_code), EscapeMessage(message));
		
	}
	public static function FileDialogComplete(callback:String, num_files_selected:Number):Void {
		
		ExternalInterface.call(callback, EscapeMessage(num_files_selected));
		
	}
	
	public static function UploadStart(callback:String, file_object:Object):Void  {
		ExternalInterface.call(callback, EscapeMessage(file_object));
	}
	
	public static function UploadProgress(callback:String, file_object:Object, bytes_loaded:Number, bytes_total:Number):Void {
		
		ExternalInterface.call(callback, EscapeMessage(file_object), EscapeMessage(bytes_loaded), EscapeMessage(bytes_total));
		
	}
	public static function UploadSuccess(callback:String, file_object:Object):Void {
		
		ExternalInterface.call(callback, EscapeMessage(file_object));
		
	}
	public static function UploadError(callback:String, error_code:Number, file_object:Object, message:String):Void {
		
		ExternalInterface.call(callback, EscapeMessage(file_object), EscapeMessage(error_code), EscapeMessage(message));
		
	}
	public static function UploadComplete(callback:String, file_object:Object):Void {
		
		ExternalInterface.call(callback, EscapeMessage(file_object));
		
	}
	public static function Debug(callback:String, message:String):Void {
		
		ExternalInterface.call(callback, EscapeMessage(message));
		
	}
	
	/* Escapes all the backslashes which are not translated correctly in the Flash -> JavaScript Interface
	 * 
	 * These functions had to be developed because the ExternalInterface has a bug that simply places the
	 * value a string in quotes (except for a " which is escaped) in a JavaScript string literal which
	 * is executed by the browser.  These often results in improperly escaped string literals if your
	 * input string has any backslash characters. For example the string:
	 * 		"c:\Program Files\uploadtools\"
	 * is placed in a string literal (with quotes escaped) and becomes:
	 * 		var __flash__temp = "\"c:\Program Files\uploadtools\\"";
	 * This statement will cause errors when executed by the JavaScript interpreter:
	 * 	1) The first \" is succesfully transformed to a "
	 *  2) \P is translated to P and the \ is lost
	 *  3) \u is interpreted as a unicode character and causes an error in IE
	 *  4) \\ is translated to \
	 *  5) leaving an unescaped " which causes an error
	 * 
	 * I fixed this by escaping \ characters in all outgoing strings.  The above escaped string becomes:
	 * 		var __flash__temp = "\"c:\\Program Files\\uploadtools\\\"";
	 * which contains the correct string literal.
	 * 
	 * Note: The "var __flash__temp = " portion of the example is part of the ExternalInterface not part of
	 * my escaping routine.
	 */
	private static function EscapeMessage(message) {
		if (typeof message == "string") {
			message = EscapeString(message);
		}
		else if (typeof message == "array") {
			message = EscapeArray(message);
		}
		else if (typeof message == "object") {
			message = EscapeObject(message);
		}
		
		return message;
	}
	
	private static function EscapeString(message:String):String {
		//var replacePattern:RegExp = /\\/g; //new RegExp("/\\/", "g");
		return message.split("\\").join("\\\\").split("\n").join("\\n").split("\r").join("\\r").split("\f").join("\\f").split("\b").join("\\b");
	}
	private static function EscapeArray(message_array:Array):Array {
		var length:Number = message_array.length;
		var i:Number = 0;
		for (i=0; i < length; i++) {
			message_array[i] = EscapeMessage(message_array[i]);
		}
		return message_array;
	}
	private static function EscapeObject(message_obj:Object):Object {
		for (var name:String in message_obj) {
			message_obj[name] = EscapeMessage(message_obj[name]);
		}
		return message_obj;
	}

}