<?php

namespace Deploymentcenter\Core;

use PDO;
use PDOException;

class Db
{
    private static ?PDO $instance = null;

    public static function init(array $config): PDO
    {
        if (self::$instance === null) {
            $dbCfg = isset($config['db']) ? $config['db'] : $config;
            $dsn = sprintf('mysql:host=%s;dbname=%s;charset=%s', $dbCfg['host'], $dbCfg['dbname'], $dbCfg['charset'] ?? 'utf8mb4');
            
            $options = [
                PDO::ATTR_ERRMODE            => PDO::ERRMODE_EXCEPTION,
                PDO::ATTR_DEFAULT_FETCH_MODE => PDO::FETCH_ASSOC,
                PDO::ATTR_EMULATE_PREPARES   => false,
            ];

            try {
                self::$instance = new PDO($dsn, $dbCfg['username'], $dbCfg['password'], $options);
            } catch (PDOException $e) {
                throw new \Exception('Database connection failed: ' . $e->getMessage());
            }
        }
        return self::$instance;
    }

    public static function connect(array $config): PDO
    {
        return self::init($config);
    }

    public static function getInstance(): PDO
    {
        if (self::$instance === null) {
            $config = require __DIR__ . '/../../config/config.php';
            return self::init($config);
        }
        return self::$instance;
    }
}