<?php
class App_Questioner
{
	/**
	 * @var array
	 */
	protected $_askedQuestions = array();

	public function getAskedQuestions()
	{
		return $this->_askedQuestions;
	}

	public function setAskedQuestions(array $questions)
	{
		$this->_askedQuestions = $questions;
	}

	/**
	 * Returns a not asked random question
	 * @return Quiz_Question
	 */
	public function getRandomQuestion()
	{
		$askedIds = array();
		foreach($this->_askedQuestions as $a)
			$askedIds[] = $a['id'];

		$dao = App_DaoFactory::getFactory()->getQuestionDao();
		return $dao->fetchRandomQuestionNotIn($askedIds);
	}

	public function getBestAnswer()
	{
		if(count($this->_askedQuestions) === 0)
			throw new App_Questioner_Exception('No asked questions set, cant provide best answer');

		$iterations = array();
		$qaDao = App_DaoFactory::getFactory()->getQuestionAnswerDao();
		foreach($this->_askedQuestions as $q)
		{
			$qa = new Quiz_QuestionAnswer();
			$qa->setQuestionId($q['id']);
			$qa->setChoice($q['choice']);

			$prevIterAnswers = array();
			if(count($iterations) > 0)
				$prevIterAnswers = $iterations[ count($iterations) - 1 ];

			$possibleAnswers = array();
			if(count($prevIterAnswers) > 0)
			{				
				foreach($prevIterAnswers as $a)
					$possibleAnswers[] = $a['answer_id'];
			}

			$iterations[] = $qaDao->fetchAnswersTo($qa, $possibleAnswers);
		}

		$iterations = array_reverse($iterations);
		foreach($iterations as $i)
		{
			if(count($i) > 0)
			{
				$dao = App_DaoFactory::getFactory()->getAnswerDao();
				return $dao->findAnswer($i[0]);
			}
		}

		return null;
	}
}