<?php

/**
 * Class DatabaseConfig
 */
class DatabaseConfig
{
    // to powinno być ładowane z jakiegoś yamla czy czegoś i walidowane
    /**
     * @var array
     */
    private $config = [
        'db_server'   => '127.0.0.1',
        'db_name'     => 'schema',
        'db_user'     => 'user1',
        'db_password' => 'password123',
    ];

    /**
     * @var string
     */
    public $dbServer;

    /**
     * @var string
     */
    public $dbName;

    /**
     * @var string
     */
    public $dbUser;

    /**
     * @var string
     */
    public $dbPassword;

    /**
     * DatabaseConfig constructor.
     * inb4 gettery dla każdego pola
     */
    public function __construct()
    {
        $this->dbName = $this->config['db_name'];
        $this->dbServer = $this->config['db_server'];
        $this->dbUser = $this->config['db_user'];
        $this->dbPassword = $this->config['db_password'];
    }

}

/**
 * Class DatabaseManager
 */
class DatabaseManager
{

    /**
     * @var DatabaseConfig
     */
    protected $dbConfig;

    /**
     * @var PDO
     */
    protected $db;

    /**
     * DatabaseManager constructor.
     *
     * @param DatabaseConfig $config
     */
    public function __construct(DatabaseConfig $config)
    {
        $this->dbConfig = $config;
        $this->db = $this->preparePdo();
    }

    /**
     * @param string $sql
     *
     * @return array
     */
    public function getResults($sql)
    {
        $sql = $this->db->query($sql);
        $result = $sql->fetchAll(PDO::FETCH_ASSOC);

        return $result;
    }


    /**
     * @throws
     * @return PDO
     */
    private function preparePdo()
    {
        try {
            return new PDO(
                'mysql:host='.$this->dbConfig->dbServer.':dbname='.$this->dbConfig->dbName,
                $this->dbConfig->dbUser,
                $this->dbConfig->dbPassword,
                [
                    PDO::ATTR_EMULATE_PREPARES => false,
                    PDO::ATTR_ERRMODE          => PDO::ERRMODE_EXCEPTION,
                ]
            );
        } catch (PDOException $e) {
            throw $e; //todo error handling
        }
    }
}