mivita/app/Services/Payment/Stripe/StripeWebhookHandler.php

<?php

namespace App\Services\Payment\Stripe;

use App\Models\ShoppingOrder;
use App\Models\ShoppingPayment;
use App\Models\StripeWebhookEvent;
use App\Models\UserAbo;
use App\Services\AboPaymentMethodService;
use App\Services\CheckoutFunnelTracker;
use App\Services\Payment;
use App\Services\Payment\Stripe\DTOs\StripeWebhookResult;
use App\Services\ShoppingUserService;
use App\Services\Util;
use Illuminate\Database\QueryException;
use Illuminate\Support\Facades\DB;
use Illuminate\Support\Facades\Log;
use Stripe\Event;
use Stripe\Exception\SignatureVerificationException;
use Stripe\Webhook;

/**
 * Verarbeitet Stripe-Webhooks: Signaturprüfung, Idempotenz über die
 * Event-ID (stripe_webhook_events), Transaktions-Protokollierung und der
 * Paid-Pfad. Muster: PayoneWebhookHandler (txaction-Priorität, DB-Lock,
 * zentrale Persistenz, Betragsabgleich).
 */
class StripeWebhookHandler
{
    public const HANDLED_TYPES = [
        'checkout.session.completed',
        'checkout.session.expired',
        'payment_intent.succeeded',
        'payment_intent.processing',
        'payment_intent.payment_failed',
        'charge.succeeded',
        'charge.refunded',
        'charge.dispute.created',
        'setup_intent.succeeded',
    ];

    /**
     * Gleiche txaction-Taxonomie wie PAYONE, damit alle nachgelagerten
     * Ansichten/Services (Order-Status, Abo-Logik) unverändert funktionieren.
     *
     * @var array<string, int>
     */
    private const TXACTION_PRIORITY = [
        'appointed' => 1,
        'pending' => 2,
        'failed' => 3,
        'paid' => 10,
    ];

    public function handle(string $payload, ?string $signatureHeader): StripeWebhookResult
    {
        $secret = (string) config('stripe.webhook_secret');
        if (trim($secret) === '') {
            Log::channel('stripe')->error('Stripe-Webhook empfangen, aber STRIPE_WEBHOOK_SECRET ist nicht gesetzt.');

            return StripeWebhookResult::notConfigured();
        }

        try {
            $event = Webhook::constructEvent($payload, (string) $signatureHeader, $secret);
        } catch (SignatureVerificationException|\UnexpectedValueException $e) {
            Log::channel('stripe')->warning('Stripe-Webhook abgewiesen (Signatur/Payload): '.$e->getMessage());

            return StripeWebhookResult::invalidSignature($e->getMessage());
        }

        /*
         * Idempotenz: Ein Event gilt als Duplikat, wenn es bereits VOLLSTÄNDIG
         * verarbeitet wurde (processed_at) oder sein Typ keine Verarbeitung braucht.
         * Ein gespeichertes, aber unverarbeitetes Event (Crash mitten in der
         * Verarbeitung → non-2xx → Stripe-Retry) wird erneut verarbeitet.
         */
        $storedEvent = StripeWebhookEvent::where('event_id', $event->id)->first();
        if ($storedEvent && ($storedEvent->processed_at !== null || ! in_array($event->type, self::HANDLED_TYPES, true))) {
            Log::channel('stripe')->info("Stripe-Webhook-Duplikat ignoriert: {$event->id} ({$event->type})");

            return StripeWebhookResult::duplicate($event->id, $event->type);
        }

        $object = $event->data->object->toArray();

        if (! $storedEvent) {
            try {
                $storedEvent = StripeWebhookEvent::create([
                    'event_id' => $event->id,
                    'type' => $event->type,
                    'api_version' => $event->api_version,
                    'payload' => StripeTransactionRecorder::redactPayload($object),
                ]);
            } catch (QueryException) {
                // Unique-Verletzung: paralleler Retry hat das Event gerade angelegt.
                return StripeWebhookResult::duplicate($event->id, $event->type);
            }
        }

        if (! in_array($event->type, self::HANDLED_TYPES, true)) {
            Log::channel('stripe')->info("Stripe-Webhook protokolliert, Typ nicht behandelt: {$event->id} ({$event->type})");

            return StripeWebhookResult::ignored($event->id, $event->type);
        }

        if (! $this->dispatchEvent($event->id, $event->type, $object)) {
            return StripeWebhookResult::paymentNotYetVisible($event->id, $event->type);
        }

        $storedEvent->update(['processed_at' => now()]);

        return StripeWebhookResult::processed($event->id, $event->type);
    }

    /**
     * Verarbeitet ein gespeichertes, noch unverarbeitetes Event nach
     * (stripe:process-pending-events): z. B. wenn der Webhook die Cron-
     * DB-Transaktion überholt hat (503) und kein Stripe-Retry kommt
     * (Stripe CLI leitet non-2xx nicht erneut zu). Die Signatur wurde
     * bereits beim Empfang geprüft; der Payload liegt redaktiert vor.
     *
     * @return bool true = verarbeitet (processed_at gesetzt), false = weiterhin nicht zuordenbar
     */
    public function processStoredEvent(StripeWebhookEvent $storedEvent): bool
    {
        if ($storedEvent->processed_at !== null || ! in_array($storedEvent->type, self::HANDLED_TYPES, true)) {
            return false;
        }

        if (! $this->dispatchEvent($storedEvent->event_id, $storedEvent->type, $storedEvent->payload ?? [])) {
            return false;
        }

        $storedEvent->update(['processed_at' => now()]);

        return true;
    }

    /**
     * @param  array<string, mixed>  $object
     * @return bool false = Zahlung mit unserer Metadata (noch) nicht sichtbar → Stripe-Retry anfordern
     */
    private function dispatchEvent(string $eventId, string $eventType, array $object): bool
    {
        /*
         * Setup-Flow "Zahlungsart ändern" (Plan S5): trägt keine Zahlung,
         * sondern ein Abo in der Metadata — vor der Zahlungs-Auflösung behandeln.
         */
        if ($eventType === 'setup_intent.succeeded') {
            $this->handleSetupIntentSucceeded($eventId, $object);

            return true;
        }
        if ($eventType === 'checkout.session.completed' && ($object['mode'] ?? null) === 'setup') {
            Log::channel('stripe')->info("Setup-Session abgeschlossen (Verankerung via setup_intent.succeeded): {$eventId}");

            return true;
        }

        $payment = $this->resolveShoppingPayment($object);

        if (! $payment) {
            /*
             * Trägt das Event unsere Metadata, existiert die Zahlung sicher —
             * sie ist nur noch nicht sichtbar (Cron bucht innerhalb einer
             * DB-Transaktion ab, der Webhook kann den Commit überholen).
             * Dann Retry anfordern statt das Event als verarbeitet zu begraben.
             */
            if (! empty($object['metadata']['shopping_payment_id'])) {
                Log::channel('stripe')->warning(sprintf(
                    'Stripe-Webhook: Zahlung aus metadata.shopping_payment_id=%s (noch) nicht auffindbar — Retry angefordert: %s (%s)',
                    $object['metadata']['shopping_payment_id'],
                    $eventId,
                    $eventType,
                ));

                return false;
            }

            Log::channel('stripe')->warning(sprintf(
                'Stripe-Webhook ohne zuordenbare Zahlung: %s (%s, object %s)',
                $eventId,
                $eventType,
                $object['id'] ?? '?',
            ));

            return true;
        }

        StripeTransactionRecorder::recordFromStripeObject($payment, $eventType, $object);

        $this->rememberPaymentIntentReference($payment, $object);

        match ($eventType) {
            'checkout.session.completed' => $this->handleSessionCompleted($payment, $object),
            'checkout.session.expired' => $this->handleSessionExpired($payment),
            'payment_intent.succeeded' => $this->markPaid($payment, $object),
            'payment_intent.processing' => $this->markPending($payment),
            'payment_intent.payment_failed' => $this->markFailed($payment),
            'charge.succeeded' => $this->storePaymentMethodDetails($payment, $object),
            // charge.refunded / dispute / setup_intent → Business-Logik folgt in S5–S7 bzw. S9.
            default => Log::channel('stripe')->info("Stripe-Webhook protokolliert (Verarbeitung folgt in späterer Phase): {$eventType}"),
        };

        return true;
    }

    /**
     * Setup-Flow "Zahlungsart ändern" (Plan S5.2): neue PaymentMethod am Abo
     * verankern. Sicherheitsnetz zum Return-Pfad — die Verankerung selbst
     * (AboPaymentMethodService::applyStripePaymentMethod) ist idempotent.
     *
     * @param  array<string, mixed>  $object
     */
    private function handleSetupIntentSucceeded(string $eventId, array $object): void
    {
        $userAboId = (int) ($object['metadata']['user_abo_id'] ?? 0);
        if ($userAboId <= 0) {
            Log::channel('stripe')->info("SetupIntent ohne Abo-Metadata protokolliert: {$eventId}");

            return;
        }

        $userAbo = UserAbo::find($userAboId);
        $paymentMethodId = is_string($object['payment_method'] ?? null) ? $object['payment_method'] : null;
        $customerId = is_string($object['customer'] ?? null) ? $object['customer'] : null;

        if (! $userAbo || ! $paymentMethodId || ! $customerId) {
            Log::channel('stripe')->warning("SetupIntent nicht anwendbar (Abo/PaymentMethod/Customer fehlt): {$eventId}", [
                'user_abo_id' => $userAboId,
                'payment_method' => $paymentMethodId,
                'customer' => $customerId,
            ]);

            return;
        }

        $source = trim((string) ($object['metadata']['source'] ?? ''));

        app(AboPaymentMethodService::class)->applyStripePaymentMethod(
            $userAbo,
            $customerId,
            $paymentMethodId,
            $source !== '' ? $source : 'stripe-webhook',
        );
    }

    /**
     * Merkt sich die PaymentIntent-ID an der Zahlung, sobald sie bekannt ist.
     * Charge-Events tragen keine Metadata — sie werden über
     * external_reference = PaymentIntent-ID zugeordnet.
     *
     * @param  array<string, mixed>  $object
     */
    private function rememberPaymentIntentReference(ShoppingPayment $payment, array $object): void
    {
        $paymentIntentId = match ($object['object'] ?? null) {
            'payment_intent' => $object['id'] ?? null,
            default => $object['payment_intent'] ?? null,
        };

        if ($paymentIntentId && $payment->external_reference !== $paymentIntentId) {
            $payment->external_reference = $paymentIntentId;
            $payment->save();
        }
    }

    /**
     * Session abgeschlossen: bei `paid` sofort der Paid-Pfad; bei asynchronen
     * Methoden (SEPA & Co., payment_status=unpaid) ist die Bestellung platziert
     * und wartet auf payment_intent.succeeded → Status "appointed" wie PAYONE.
     *
     * @param  array<string, mixed>  $object
     */
    private function handleSessionCompleted(ShoppingPayment $payment, array $object): void
    {
        if (($object['payment_status'] ?? null) === 'paid') {
            $this->markPaid($payment, $object);

            return;
        }

        $order = $payment->shopping_order;
        $this->upgradeTxaction($order, $payment, 'appointed');
        $order->setUserHistoryValue(['status' => 7]);
        ShoppingUserService::snycOrdersByShoppingOrder($order);
        Util::setInstanceStatusByPayment($payment, 4);

        CheckoutFunnelTracker::confirmedPayment(
            shoppingPaymentId: $payment->id,
            txaction: 'appointed',
            metadata: ['provider' => 'stripe', 'session' => $object['id'] ?? null],
        );

        Payment::paymentStatusSendMail($order, $payment, [
            'txaction' => 'appointed',
            'mode' => $payment->mode,
            'send_link' => false,
        ]);
    }

    /**
     * @param  array<string, mixed>  $object
     */
    private function markPaid(ShoppingPayment $payment, array $object): void
    {
        if (! $this->amountMatches($payment, $object)) {
            return;
        }

        $this->captureOffSessionPaymentMethod($payment, $object);

        $order = $payment->shopping_order;
        $this->upgradeTxaction($order, $payment, 'paid');

        $sendLink = false;
        $sendMail = true;

        DB::beginTransaction();
        try {
            $lockedOrder = ShoppingOrder::where('id', $order->id)->lockForUpdate()->first();
            if (! $lockedOrder->paid) {
                $sendLink = Payment::paymentStatusPaidAction($lockedOrder, true, $payment);
                DB::commit();
            } else {
                $sendMail = false;
                DB::commit();
            }
        } catch (\Exception $e) {
            DB::rollBack();
            Log::channel('stripe')->error('Stripe-Paid-Pfad fehlgeschlagen (Stripe stellt erneut zu): '.$e->getMessage(), [
                'shopping_order_id' => $order->id,
                'shopping_payment_id' => $payment->id,
            ]);
            throw $e;
        }

        CheckoutFunnelTracker::confirmedPayment(
            shoppingPaymentId: $payment->id,
            txaction: 'paid',
            metadata: ['provider' => 'stripe', 'object' => $object['id'] ?? null, 'mode' => $payment->mode],
        );

        if ($sendMail) {
            Payment::paymentStatusSendMail($order, $payment, [
                'txaction' => 'paid',
                'mode' => $payment->mode,
                'send_link' => $sendLink,
            ]);
        }

        $this->backfillPaymentMethodDetails($payment);
    }

    /**
     * Abo-/Recovery-Zahlungen (Plan S4): Customer- und PaymentMethod-ID an der
     * Zahlung persistieren, BEVOR der Paid-Pfad läuft — createNewAbo() bzw.
     * advanceAboAfterRecoveryPayment() übernehmen sie von dort ans Abo.
     * Session-Events tragen keine payment_method: dann aus dem Event-Store
     * (PaymentIntent-/Charge-Event) nachschlagen, als letzter Ausweg per API.
     *
     * @param  array<string, mixed>  $object
     */
    private function captureOffSessionPaymentMethod(ShoppingPayment $payment, array $object): void
    {
        $order = $payment->shopping_order;
        if (! $order->is_abo && empty($order->recovery_user_abo_id)) {
            return;
        }
        if (! empty($payment->stripe_customer_id) && ! empty($payment->stripe_payment_method_id)) {
            return;
        }

        $customerId = is_string($object['customer'] ?? null) ? $object['customer'] : null;
        $paymentMethodId = ($object['object'] ?? null) === 'payment_intent' && is_string($object['payment_method'] ?? null)
            ? $object['payment_method']
            : null;

        $paymentIntentId = ($object['object'] ?? null) === 'payment_intent'
            ? ($object['id'] ?? null)
            : ($object['payment_intent'] ?? $payment->external_reference);

        if (! $paymentMethodId && $paymentIntentId) {
            $storedEvent = StripeWebhookEvent::where('type', 'payment_intent.succeeded')
                ->where('payload->id', $paymentIntentId)
                ->latest('id')
                ->first()
                ?? StripeWebhookEvent::where('type', 'charge.succeeded')
                    ->where('payload->payment_intent', $paymentIntentId)
                    ->latest('id')
                    ->first();

            if ($storedEvent) {
                $payload = $storedEvent->payload ?? [];
                $paymentMethodId = is_string($payload['payment_method'] ?? null) ? $payload['payment_method'] : null;
                $customerId = $customerId ?: (is_string($payload['customer'] ?? null) ? $payload['customer'] : null);
            }
        }

        if ((! $paymentMethodId || ! $customerId) && $paymentIntentId) {
            try {
                $paymentIntent = app(StripeClientWrapper::class)->client()->paymentIntents->retrieve($paymentIntentId);
                $paymentMethodId = $paymentMethodId ?: (is_string($paymentIntent->payment_method) ? $paymentIntent->payment_method : ($paymentIntent->payment_method->id ?? null));
                $customerId = $customerId ?: (is_string($paymentIntent->customer) ? $paymentIntent->customer : ($paymentIntent->customer->id ?? null));
            } catch (\Throwable $e) {
                Log::channel('stripe')->error('PaymentIntent-Nachladen für Abo-Zahlungsmittel fehlgeschlagen: '.$e->getMessage(), [
                    'shopping_payment_id' => $payment->id,
                    'payment_intent' => $paymentIntentId,
                ]);
            }
        }

        if ($customerId || $paymentMethodId) {
            $payment->stripe_customer_id = $payment->stripe_customer_id ?: $customerId;
            $payment->stripe_payment_method_id = $payment->stripe_payment_method_id ?: $paymentMethodId;
            $payment->save();
        }
    }

    /**
     * Speichert womit gezahlt wurde (Kartenmarke/letzte 4/Wallet, PayPal, Klarna …)
     * aus den payment_method_details des Charge-Objekts in carddata — für die
     * Anzeige in Bestellungen/Mails (ShoppingPayment::getPaymentType()).
     *
     * @param  array<string, mixed>  $chargeObject
     */
    private function storePaymentMethodDetails(ShoppingPayment $payment, array $chargeObject): void
    {
        $summary = self::paymentMethodSummary($chargeObject);

        if ($summary !== null && empty($payment->carddata)) {
            $payment->carddata = $summary;
            $payment->save();
        }
    }

    /**
     * Webhook-Reihenfolge ist nicht garantiert: Kam charge.succeeded VOR dem
     * PaymentIntent-Event, war es noch keiner Zahlung zuordenbar — es liegt
     * aber im Event-Store. Von dort nachziehen, ganz ohne API-Call.
     */
    private function backfillPaymentMethodDetails(ShoppingPayment $payment): void
    {
        if (! empty($payment->carddata) || empty($payment->external_reference)) {
            return;
        }

        $chargeEvent = StripeWebhookEvent::where('type', 'charge.succeeded')
            ->where('payload->payment_intent', $payment->external_reference)
            ->latest('id')
            ->first();

        if ($chargeEvent) {
            $this->storePaymentMethodDetails($payment, $chargeEvent->payload ?? []);
        }
    }

    /**
     * @param  array<string, mixed>  $chargeObject
     * @return array<string, mixed>|null
     */
    public static function paymentMethodSummary(array $chargeObject): ?array
    {
        $details = $chargeObject['payment_method_details'] ?? null;
        $type = $details['type'] ?? null;

        if (! $type) {
            return null;
        }

        $summary = ['type' => $type];

        if ($type === 'card') {
            $summary['brand'] = $details['card']['brand'] ?? null;
            $summary['last4'] = $details['card']['last4'] ?? null;
            $summary['wallet'] = $details['card']['wallet']['type'] ?? null;
            $summary['exp'] = isset($details['card']['exp_month'], $details['card']['exp_year'])
                ? sprintf('%02d/%d', $details['card']['exp_month'], $details['card']['exp_year'])
                : null;
        }

        if ($type === 'sepa_debit') {
            $summary['last4'] = $details['sepa_debit']['last4'] ?? null;
        }

        return $summary;
    }

    /**
     * Asynchrone Zahlung unterwegs (SEPA & Co.). Kein Mailversand — die
     * Bestellbestätigung ging bereits bei checkout.session.completed raus.
     */
    private function markPending(ShoppingPayment $payment): void
    {
        $this->upgradeTxaction($payment->shopping_order, $payment, 'pending');
    }

    /**
     * Fehlgeschlagener Zahlungsversuch. Bewusst KEINE Mail: Auf der Hosted
     * Checkout Session kann der Kunde direkt erneut zahlen — jeder Fehlversuch
     * feuert dieses Event, eine Mail pro Versuch wäre Spam. Endgültiges
     * Scheitern zeigt sich als checkout.session.expired bzw. Cancel-Return.
     */
    private function markFailed(ShoppingPayment $payment): void
    {
        $order = $payment->shopping_order;
        $this->upgradeTxaction($order, $payment, 'failed');
        $order->setUserHistoryValue(['status' => 6]);
        Util::setInstanceStatusByPayment($payment, 5);
    }

    /**
     * Session nach 24 h abgelaufen, ohne Zahlung: Vorgang als abgebrochen
     * markieren (wie Cancel-Return), Bestellstatus bleibt unangetastet.
     */
    private function handleSessionExpired(ShoppingPayment $payment): void
    {
        if ($payment->shopping_order->paid) {
            return;
        }

        $payment->status = 'expired';
        $payment->save();
        $payment->shopping_order->setUserHistoryValue(['status' => 22]);
        Util::setInstanceStatusByPayment($payment, 6);
    }

    /**
     * Betragsabgleich (Pendant zum PAYONE-Guard 2006): Der bestätigte Betrag
     * muss dem initiierten entsprechen, sonst keine Paid-Verarbeitung.
     *
     * @param  array<string, mixed>  $object
     */
    private function amountMatches(ShoppingPayment $payment, array $object): bool
    {
        $confirmed = $object['amount_total'] ?? $object['amount_received'] ?? $object['amount'] ?? null;

        if ($confirmed === null || (int) $confirmed !== (int) $payment->amount) {
            Log::channel('stripe')->error('Stripe-Webhook Betragsabweichung — Paid-Verarbeitung verweigert.', [
                'shopping_payment_id' => $payment->id,
                'expected_cents' => (int) $payment->amount,
                'confirmed_cents' => $confirmed,
                'object' => $object['id'] ?? null,
            ]);

            return false;
        }

        return true;
    }

    private function upgradeTxaction(ShoppingOrder $order, ShoppingPayment $payment, string $txaction): void
    {
        $currentPriority = self::TXACTION_PRIORITY[$order->txaction] ?? 0;
        $newPriority = self::TXACTION_PRIORITY[$txaction] ?? 0;

        if ($newPriority > $currentPriority) {
            $order->txaction = $txaction;
            $order->save();
            $payment->txaction = $txaction;
            $payment->save();
        }
    }

    /**
     * Ordnet ein Stripe-Objekt einer Zahlung zu: über die von uns gesetzte
     * Metadata (shopping_payment_id, Session UND PaymentIntent tragen sie)
     * oder über external_reference (Session-/PaymentIntent-ID).
     *
     * @param  array<string, mixed>  $object
     */
    private function resolveShoppingPayment(array $object): ?ShoppingPayment
    {
        $metadataId = $object['metadata']['shopping_payment_id'] ?? null;
        if ($metadataId && ($payment = ShoppingPayment::find((int) $metadataId))) {
            return $payment;
        }

        $references = array_filter([
            $object['id'] ?? null,
            $object['payment_intent'] ?? null,
        ]);
        foreach ($references as $reference) {
            $payment = ShoppingPayment::where('external_reference', $reference)->first();
            if ($payment) {
                return $payment;
            }
        }

        return null;
    }
}