<?php

namespace Source\Core;
use PDO;
use PDOException;

/**
 * FSPHP | Class Connect [ Singleton Pattern ]
 *
 * @author Robson V. Leite <cursos@upinside.com.br>
 * @package Source\Core
 */
class Connect
{
    /** @const array */
    private const OPTIONS = [
        PDO::MYSQL_ATTR_INIT_COMMAND => "SET NAMES utf8",
        PDO::ATTR_ERRMODE => PDO::ERRMODE_EXCEPTION,
        PDO::ATTR_DEFAULT_FETCH_MODE => PDO::FETCH_OBJ,
        PDO::ATTR_CASE => PDO::CASE_NATURAL
    ];

    /** @var PDO */
    private static $instance;

    /**
     * @return PDO
     */
    public static function getInstance(): ?PDO
    {
        if (empty(self::$instance)) {
            try {
                self::$instance = new PDO(
                    "mysql:host=" . CONF_DB_HOST . ";dbname=" . CONF_DB_NAME,
                    CONF_DB_USER,
                    CONF_DB_PASS,
                    self::OPTIONS
                );
            } catch (PDOException $exception) {
                redirect("/ops/problemas");
            }
        }

        return self::$instance;
    }

    /**
     * Connect constructor.
     */
    private function __construct()
    {
    }

    /**
     * Connect clone.
     */
    private function __clone()
    {
    }
}