<?php
namespace TestProject;

/*
 * Question class
 */
class Question extends Item {
	private const tb_str      = 'question';
	private const resulTb_str = 'question_result';

	private $text_str;
	private $answers_arr;

	/**
	 * Load question
	 *
	 * @param int $id_int ID of question to load
	 */
	public function __construct( int $id_int ){
		$db = DB::getDB();

		$rows_arr = $db->select( self::tb_str, array(), array( 'id' => $id_int ) );

		if ( empty( $rows_arr ) ){
			throw new \RuntimeException( 'Invalid question ID' );
		}

		$this->id_int   = $rows_arr[0]['id'];
		$this->text_str = $rows_arr[0]['text'];

		$answerID_arr = Answer::getList( $this->id_int );
		$this->answers_arr = array();

		foreach( $answerID_arr as $answerID_int ){
			$this->answers_arr[] = new Answer( $answerID_int );
		}
	}

	/**
	 * Get a list of question IDs for a quiz
	 *
	 * @param int $quizID_int ID of quiz to load questions for
	 *
	 * @return int[] Array of question IDs
	 */
	public static function getList( int $quizID_int ){
		$db = DB::getDB();

		$rows_arr = $db->select( self::tb_str, array( 'id' ), array( 'quiz' => $quizID_int ) );

		$id_arr = array();
		foreach( $rows_arr as $row_arr ){
			$id_arr[] = $row_arr['id'];
		}

		return $id_arr;
	}

	/**
	 * Get question text
	 *
	 * @return string Question text
	 */
	public function getText(){
		return $this->text_str;
	}

	/**
	 * Get Answers for question
	 *
	 * @return TestProject\Answer[] Array of answer objects
	 */
	public function getAnswers(){
		return $this->answers_arr;
	}
}