<?php

/**
 * Description of Survey
 *
 * @author jkraaijeveld
 */
class Survey extends ResearchToolObject{
    public $title;
    public $description;
    public $creator;
    public $questions;
    
    public function __construct($uid = null, $title = null, $description = null, $creator = null, $questions = null) {
        if(!isset($uid))
        {
            $uid = md5(uniqid(rand(), true));
        }
        $this->uid = $uid;
        $this->title = $title;
		$this->description = $description;
		$this->creator = $creator;
        $this->questions = $questions;
	}

	/**
	 * function evaluate()
	 * Evaluates the references
	 */
	public function evaluate()
	{
		$dbi = new DatabaseInterface();
		if(is_string($this->creator))
		{
			$result = $dbi->get("user", array("uid" => $this->creator));	
			if(!isset($result[0]))
				return false;
			$this->creator = $result[0];
		}

		if(!empty($this->questions) && is_string($this->questions[0]))
		{
			$newQuestions = array();
			foreach($this->questions as $question)
			{
				$result = $dbi->get("question", array("uid" => $question));
				if(!isset($result[0]))
					return false;
				$newQuestions[] = $result[0];			
			}
			$this->questions = newQuestions;
		}
		return true;
	}
}

?>