<?php

declare(strict_types=1);

namespace Abovault;

use Abovault\Dunning\LifecycleScheduler;
use Abovault\Retention\TriggerRegistry;
use Abovault\Retention\ExecutionService;
use Abovault\Gateway\SepaGateway;
use Abovault\Gateway\Stripe\WebhookHandler;
use Abovault\Blocks\SepaBlocksSupport;
use Abovault\Product\SubscriptionProduct;
use Abovault\Admin\SettingsPage;

defined('ABSPATH') || exit;

/**
 * Main plugin orchestrator (singleton). Wires the subsystems onto WordPress/WooCommerce.
 *
 * Subsystems (see MVP-Lastenheft):
 *   - Dunning\LifecycleScheduler  → hourly state-machine (port of processSubscriptionRenewals)
 *   - Retention\TriggerRegistry   → events (payment_failed, period_ending, cancel_requested, anniversary)
 *   - Retention\ExecutionService  → process due enrollments (port of reEngagement engine)
 *   - Gateway\SepaGateway         → SEPA-first payment gateway
 */
final class Plugin
{
    private static ?Plugin $instance = null;

    private function __construct() {}

    public static function instance(): Plugin
    {
        return self::$instance ??= new self();
    }

    public function boot(): void
    {
        // Dunning / lifecycle — the core.
        (new LifecycleScheduler())->register();

        // Retention — the crown jewel (trigger → enrollment → execution).
        TriggerRegistry::instance()->register();
        (new ExecutionService())->register();

        // Payment — SEPA-first (Stripe).
        add_filter('woocommerce_payment_gateways', [$this, 'registerGateways']);

        // Stripe webhook — source of truth for async SEPA outcomes.
        (new WebhookHandler())->register();

        // WooCommerce Blocks (Cart/Checkout block) — the default modern checkout.
        add_action('woocommerce_blocks_payment_method_type_registration', static function ($registry): void {
            if (class_exists(\Automattic\WooCommerce\Blocks\Payments\Integrations\AbstractPaymentMethodType::class)) {
                $registry->register(new SepaBlocksSupport());
            }
        });

        // Product-level subscription config.
        (new SubscriptionProduct())->register();

        // Admin.
        if (is_admin()) {
            (new SettingsPage())->register();
        }
    }

    /**
     * @param array<int, class-string> $gateways
     * @return array<int, class-string>
     */
    public function registerGateways(array $gateways): array
    {
        $gateways[] = SepaGateway::class;
        return $gateways;
    }
}