<?php

namespace App\Utils;

use PDO;
use PDOException;

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

    private function __construct()
    {
        $config = require __DIR__ . '/../../config/database.php';

        $dsn = sprintf(
            "mysql:host=%s;port=%s;dbname=%s;charset=%s",
            $config['host'],
            $config['port'],
            $config['database'],
            $config['charset']
        );

        try {
            $this->connection = new PDO(
                $dsn,
                $config['username'],
                $config['password'],
                $config['options']
            );
        } catch (PDOException $e) {
            throw new \Exception("数据库连接失败: " . $e->getMessage());
        }
    }

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

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