<?php

require_once ('php/vn/error.php');

class JsonError
{
	var $domain;
	var $code;
	var $message;
}

class JsonData
{
	var $data;
}

class JsonReply
{
	var $error = NULL;
	var $warnings = array ();
	var $data = NULL;
}

class JsonLib
{
	const ENCODING_JSON = 0;
	const ENCODING_HTML = 1;

	private static $reply = NULL;
	static $encoding = self::ENCODING_JSON;
	
	static function init ()
	{
		self::$reply = new JsonReply ();
		Error::setHandler ('JsonLib::errorHandler');
	}
	
	static function setData ($data)
	{
		self::$reply->data = $data;
	}

	static function setError ($domain, $code, $message)
	{
		if (!isset (self::$reply->error))
		{
			$error = new JsonError ();
			$error->domain = $domain;
			$error->code = $code;
			$error->message = $message;
			self::$reply->error = $error;
		}
	}
	
	static function addWarning ($str)
	{
		self::$reply->warnings[] = $str;
	}
	
	static function errorHandler ($domain, $code, $message)
	{
		self::setError ($domain, $code, $message); 
	}

	static function sendReply ()
	{
		switch (self::$encoding)
		{
			case self::ENCODING_HTML:
				if (self::$reply->error != NULL)
					print (self::$reply->error->message);
				else
					print (self::$reply->data);
				break;
			default:
				header ('Content-Type: application/json;charset=utf-8');
				print ('(' . json_encode (self::$reply) . ')');
		}
	}
}

?>