<?php

namespace App\Config;

use PDO;
use PDOException;

class Database
{
    private static $instance = null;
    private $conn;

    private function __construct()
    {
        $host = $_ENV['DB_HOST'] ?? getenv('DB_HOST') ?: 'localhost';
        $name = $_ENV['DB_NAME'] ?? getenv('DB_NAME') ?: 'dnsblock';
        $user = $_ENV['DB_USER'] ?? getenv('DB_USER') ?: 'root';
        $pass = $_ENV['DB_PASS'] ?? getenv('DB_PASS') ?: '';
        $port = $_ENV['DB_PORT'] ?? getenv('DB_PORT') ?: '3306';

        try {
            $this->conn = new PDO("mysql:host=$host;port=$port;dbname=$name;charset=utf8mb4", $user, $pass);
            $this->conn->setAttribute(PDO::ATTR_ERRMODE, PDO::ERRMODE_EXCEPTION);
            $this->conn->setAttribute(PDO::ATTR_DEFAULT_FETCH_MODE, PDO::FETCH_ASSOC);
        } catch (PDOException $e) {
            die("Connection failed: " . $e->getMessage());
        }
    }

    public static function getInstance()
    {
        if (self::$instance == null) {
            self::$instance = new Database();
        }
        return self::$instance;
    }

    public function getConnection()
    {
        return $this->conn;
    }
}