<?php
namespace ToDownload\Gateways;

if ( ! defined( 'ABSPATH' ) ) {
	exit;
}

final class GatewayRegistry {
    private static ?GatewayRegistry $instance = null;

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

    private array $gateways = [];

    private function __construct() {
        add_action('init', [$this, 'register_defaults'], 5);
    }

    public function register(string $id, GatewayInterface $gateway): void {
        $this->gateways[$id] = $gateway;
    }

    public function get(string $id): ?GatewayInterface {
        return $this->gateways[$id] ?? null;
    }

    public function all(): array {
        return $this->gateways;
    }

    public function register_defaults(): void {
        $this->register('hosted_checkout', new HostedCheckoutGateway());
    }
}