<?php

class Qs_Smarty
{
    protected static $_object;
    protected static $_instance;
    protected static $_resourceName = 'Qs';
    protected static $_template = null;
    protected static $_templateName = null;

    public static function getInstance()
    {
        if (null === self::$_instance) {
            self::$_instance = new Qs_Smarty();
        }
        return self::$_instance;
    }

    public static function setObject($object)
    {
        self::$_object = $object;
    }

    /**
     * @return Smarty
     */
    public static function getObject()
    {
        if (null === self::$_object) {
            $doc = Zend_Registry::get('doc');
            self::$_object = $doc->getSmarty();
        }
        return self::$_object;
    }

    public static function setTemplate($template)
    {
        self::$_template = $template;
    }

    public static function setTemplateName($templateName = 'template')
    {
        self::$_templateName = $templateName;
    }

    public static function render($data)
    {
        self::_checkTemplate();

        self::getObject()->register_resource(self::$_resourceName,
            [self::getInstance(), "getTemplate", "getTimestamp", "getSecure", "getTrusted"]);

        self::_assignVariables($data);
        $template = self::getObject()->fetch(self::$_resourceName . ':' . self::$_templateName);
        return $template;
    }

    protected static function _checkTemplate()
    {
        if (is_null(self::$_template)) {
            throw new Qs_Exception('Template was not defined. Use Qs_Smarty::setTemplate method ');
        }
    }

    protected static function _assignVariables($data)
    {
        foreach ($data as $name => $value) {
            self::getObject()->assign($name, $value);
        }
    }

    public function getTemplate($tpl_name, &$tpl_source, &$smarty_obj)
    {
        throw new Qs_Exception(__CLASS__ . '::' . __METHOD__ . ' must be overridden');
    }

    public function getTimestamp($tpl_name, &$tpl_timestamp, &$smarty_obj)
    {
        throw new Qs_Exception(__CLASS__ . '::' . __METHOD__ . ' must be overridden');
    }

    public function getSecure($tpl_name, &$smarty_obj) // no need to override
    {
        return true;
    }

    public function getTrusted($tpl_name, &$smarty_obj) // no need to override
    {
    }
}