<?php

namespace App\Core;

use PDO;
use PDOException;

final class Database
{
    private ?PDO $pdo = null;

    public function __construct(private readonly array $config)
    {
    }

    public function pdo(): PDO
    {
        if ($this->pdo instanceof PDO) {
            return $this->pdo;
        }

        $dsn = sprintf(
            'mysql:host=%s;port=%d;dbname=%s;charset=%s',
            $this->config['host'],
            $this->config['port'],
            $this->config['name'],
            $this->config['charset']
        );

        try {
            $this->pdo = new PDO($dsn, $this->config['user'], $this->config['pass'], [
                PDO::ATTR_ERRMODE => PDO::ERRMODE_EXCEPTION,
                PDO::ATTR_DEFAULT_FETCH_MODE => PDO::FETCH_ASSOC,
                PDO::ATTR_EMULATE_PREPARES => false,
            ]);
        } catch (PDOException $exception) {
            throw new PDOException(
                'Database connection failed: ' . $exception->getMessage(),
                (int) $exception->getCode(),
                $exception
            );
        }

        return $this->pdo;
    }

    public function isConfigured(): bool
    {
        return $this->config['name'] !== '' && $this->config['user'] !== '';
    }
}