<?php
/**
 * Search and reaplace manager
 *
 * Standard: PSR-2
 * @link http://www.php-fig.org/psr/psr-2 Full Documentation
 *
 * @package SC\DUPX\U
 *
 */
defined('ABSPATH') || defined('DUPXABSPATH') || exit;

require_once(DUPX_INIT.'/classes/utilities/template/class.u.template.item.php');

final class DUPX_Template
{

    /**
     *
     * @var DUPX_Template
     */
    private static $instance = null;

    /**
     *
     * @var DUPX_TemplateItem[] 
     */
    private $templates = array();

    /**
     *
     * @var string 
     */
    private $currentTemplate = null;

    /**
     *
     * @return DUPX_Template
     */
    public static function getInstance()
    {
        if (is_null(self::$instance)) {
            self::$instance = new self();
        }

        return self::$instance;
    }

    private function __construct()
    {
        
    }

    /**
     * 
     * @param string $name
     * @return boolean
     * @throws Exception
     */
    public function setTemplate($name)
    {
        if (!isset($this->templates[$name])) {
            throw new Exception('The template '.$name.' don\'t exists');
        }

        $this->currentTemplate = $name;
        return true;
    }

    /**
     * 
     * @param string $name
     * @param srring $mainFolder
     * @param string $parentName
     * @return boolean
     * @throws Exception
     */
    public function addTemplate($name, $mainFolder, $parentName = null)
    {
        if (isset($this->templates[$name])) {
            throw new Exception('The template "'.$name.'" already exists');
        }

        if (is_null($parentName)) {
            $parent = null;
        } else if (isset($this->templates[$parentName])) {
            $parent = $this->templates[$parentName];
        } else {
            throw new Exception('The parent template "'.$parentName.'" don\'t exists');
        }

        $this->templates[$name] = new DUPX_TemplateItem($name, $mainFolder, $parent);
        return true;
    }

    /**
     * 
     * @param string $fileTpl   // template file is a relative path from root template folder
     * @param array $args    // array key / val where key is the var name in template
     * @param bool $echo    // if false return template in string
     * 
     * @return void|string
     */
    public function render($fileTpl, $args = array(), $echo = true)
    {
        return $this->templates[$this->currentTemplate]->render($fileTpl, $args, $echo);
    }

    private function __clone()
    {
        
    }

    private function __wakeup()
    {
        
    }
}

/**
 * 
 * @param string $fileTpl   // template file is a relative path from root template folder
 * @param array $args    // array key / val where key is the var name in template
 * @param bool $echo    // if false return template in string
 * 
 * @return void|string
 */
function dupxTplRender($fileTpl, $args = array(), $echo = true)
{
    static $tplMng = null;

    if (is_null($tplMng)) {
        $tplMng = DUPX_Template::getInstance();
    }

    return $tplMng->render($fileTpl, $args, $echo);
}