<?php

class DB {
    private static $pdo = null;
    private static $config = null;

    private static function loadConfig() {
        if (self::$config === null) {
            $cfg = require __DIR__ . '/../config/config.php';

            self::$config = [
                'dsn'  => sprintf(
                    'mysql:host=%s;dbname=%s;charset=utf8mb4',
                    $cfg['db']['host'],
                    $cfg['db']['name']
                ),
                'user' => $cfg['db']['user'],
                'pass' => $cfg['db']['pass'],
            ];
        }
    }

    public static function get($forceNew = false) {
        self::loadConfig();

        if (self::$pdo === null || $forceNew) {
            self::$pdo = new PDO(
                self::$config['dsn'],
                self::$config['user'],
                self::$config['pass'],
                [
                    PDO::ATTR_ERRMODE => PDO::ERRMODE_EXCEPTION,
                    PDO::ATTR_TIMEOUT => 3,
                    PDO::ATTR_PERSISTENT => false,
                ]
            );
        }

        return self::$pdo;
    }
}