<?php


class Question
{
	private $id;
	private $from;
	private $to;
	private $problem;
	private $number;
	private $question;
	private $attached_file;

	private function __construct()
	{
	}

	public static function fromId($id)
	{
		global $DB;

		$req = $DB->prepare("SELECT * FROM `questions` WHERE `id` = ?;");
		$req->execute(htmlspecialchars($id));
		$data = $req->fetch();

		if ($data === false)
			return null;

		$question = new Question();
		$question->fill($data);
		return $question;
	}

	public static function fromAttachedFile($attached_file)
	{
		global $DB;

		$req = $DB->prepare("SELECT * FROM `questions` WHERE `attached_file` = ?;");
		$req->execute([htmlspecialchars($attached_file)]);
		$data = $req->fetch();

		if ($data === false)
			return null;

		$question = new Question();
		$question->fill($data);
		return $question;
	}

	public function fill($data)
	{
		foreach ($data as $key => $value)
			$this->$key = $value;
	}

	public static function getQuestions(Team $from, Team $to)
	{
		global $DB;

		ensure($from->getProblem() == $to->getProblem(), "Les deux équipes doivent travailler sur le même problème.");

		$req = $DB->prepare("SELECT * FROM `questions` WHERE `from` = ? AND `to` = ?;");
		$req->execute([$from->getId(), $to->getId()]);

		$questions = [];

		while (($data = $req->fetch()) !== false) {
			$question = new Question();
			$question->fill($data);
			$questions[] = $question;
		}

		if (sizeof($questions) == 0) {
			$default_questions = ["Comment avez-vous obtenu vos résultats ?",
				"Peut-on rendre votre algorithme plus efficace ? Pourquoi ?",
				"Comment élargir vos travaux ?",
				null,
				null,
				null];
			for ($_ = 0; $_ < 6; ++$_) {
				$req = $DB->prepare("INSERT INTO `questions`(`from`, `to`, `problem`, `question`) VALUES (?, ?, ?, ?);");
				$req->execute([$from->getId(), $to->getId(), $from->getProblem(), $default_questions[$_]]);
			}
			return self::getQuestions($from, $to);
		}

		return $questions;
	}

	public static function getQuestionsTo(Team $to)
	{
		global $DB, $YEAR;
		$id = $to->getId();
		$req = $DB->query("SELECT `id` from `teams` WHERE (`video_team1` = $id OR `video_team2` = $id) AND `year` = $YEAR;");

		$questions = [];

		while (($data = $req->fetch()) !== false)
			$questions[] = self::getQuestions(Team::fromId($data["id"]), $to);

		return $questions;
	}

	public function getId()
	{
		return $this->id;
	}

	public function getFrom()
	{
		return $this->from;
	}

	public function getTo()
	{
		return $this->to;
	}

	public function getProblem()
	{
		return $this->problem;
	}

	public function getNumber()
	{
		return $this->number;
	}

	public function getQuestion()
	{
		return $this->question;
	}

	public function setQuestion($question)
	{
		global $DB;
		$this->question = $question;
		$req = $DB->prepare("UPDATE `questions` SET `question` = ? WHERE `id` = ?;");
		$req->execute([$question, $this->id]);
	}

	public function getAttachedFile()
	{
		return $this->attached_file;
	}

	public function setAttachedFile($attached_file)
	{
		global $DB;
		$this->attached_file = $attached_file;
		$req = $DB->prepare("UPDATE `questions` SET `attached_file` = ? WHERE `id` = ?;");
		$req->execute([$attached_file, $this->id]);
	}
}