<?php

class GatewayAnswer
{
    private $con;

    public function __construct($con)
    {
        $this->con = $con;
    }

    public function addAnswer($answer)
    {
        $query = "insert into Answers(id,content) values (:id,:content);";
        $this->con->executeQuery(
            $query,
            array(
                ':id' => array($answer->getId(), PDO::PARAM_INT),
                ':content' => array($answer->getContent(), PDO::PARAM_STR)
            )
        );
    }

    public function getAnswerByIDQuestions($idQuestions)
    {
        $query = "SELECT * FROM Answers, Questions WHERE questions.id = :idQuestions;";
        $this->con->executeQuery($query, array(':idQuestions' => array($idQuestions, PDO::PARAM_INT)));
        $results = $this->con->getResults();
        if ($results == NULL) {
            return false;
        }
        return new Answer($results[0]['id'], $results[0]['content']);
    }

    public function updateAnswer($answer)
    {
        $query = "UPDATE Answers SET content = :content WHERE id = :id;";
        $this->con->executeQuery(
            $query,
            array(
                ':id' => array($answer->getId(), PDO::PARAM_INT),
                ':content' => array($answer->getContent(), PDO::PARAM_STR)
            )
        );
    }

    public function deleteAnswer($id)
    {
        $query = "DELETE FROM Answers WHERE id = :id;";
        $this->con->executeQuery($query, array(':id' => array($id, PDO::PARAM_INT)));
    }
}