<?php

namespace Webkul\BagistoApi\Services;

use Illuminate\Support\Facades\DB;
use Illuminate\Support\Facades\Event;
use Illuminate\Support\Facades\Log;
use Webkul\BagistoApi\Dto\PaymentCallbackInput;
use Webkul\BagistoApi\Dto\PaymentInitiateInput;
use Webkul\BagistoApi\Dto\PaymentReplayInput;
use Webkul\BagistoApi\Exception\OperationFailedException;
use Webkul\BagistoApi\Exception\ResourceNotFoundException;
use Webkul\BagistoApi\Jobs\ReconcilePendingPaymentJob;
use Webkul\BagistoApi\Models\PaymentAttempt;
use Webkul\BagistoApi\Repositories\PaymentAttemptRepository;
use Webkul\BagistoApi\Transformers\ExpressOrderResource;
use Webkul\Checkout\Facades\Cart;
use Webkul\Checkout\Repositories\CartRepository;
use Webkul\Paypal\Payment\SmartButton;
use Webkul\Sales\Models\Order;
use Webkul\Sales\Models\OrderProxy;
use Webkul\Sales\Repositories\InvoiceRepository;
use Webkul\Sales\Repositories\OrderRepository;
use Webkul\Sales\Repositories\OrderTransactionRepository;
use Webkul\Sales\Transformers\OrderResource;

/**
 * Single source of truth for the BagistoApi payment lifecycle:
 *
 * - initiate()  : create order (express or standard) + gateway order
 * - callback()  : handle success / cancel / failure from the gateway
 * - replay()    : issue a new gateway order id for a still-pending order
 * - cancelPayment(): close out a pending payment per cart-token strategy
 *
 * The matching ProcessorInterface implementations are thin wrappers so
 * GraphQL resolvers stay testable in isolation.
 */
class PaymentService
{
    public function __construct(
        protected OrderRepository $orderRepository,
        protected CartRepository $cartRepository,
        protected CartTokenService $cartTokenService,
        protected InvoiceRepository $invoiceRepository,
        protected OrderTransactionRepository $orderTransactionRepository,
        protected PaymentAttemptRepository $paymentAttemptRepository,
    ) {}

    /*
    |--------------------------------------------------------------------------
    | Initiate payment (= create order + gateway order)
    |--------------------------------------------------------------------------
    */

    /**
     * Initiate a payment on the supplied cart.
     *
     * Returns an associative array: [
     *   'order' => OrderModel,
     *   'gatewayOrderId' => ?string,
     *   'newCartToken' => ?string,
     *   'express' => bool,
     * ]
     */
    public function initiate($cart, PaymentInitiateInput $input): array
    {
        $express = (bool) $input->expressCheckout;

        if ($express && ! config('bagistoapi.express_checkout.enabled', true)) {
            throw new OperationFailedException(__('bagistoapi::app.graphql.payment.express-disabled'));
        }

        if (! $cart || $cart->items()->count() === 0) {
            throw new OperationFailedException(__('bagistoapi::app.graphql.checkout.cart-empty'));
        }

        Cart::setCart($cart);

        if ($express) {
            $this->validateExpressInitiation($cart, $input);
        } else {
            if(!$cart->shipping_method){

                if ($input->shippingMethod) {

                    if (! \Webkul\Shipping\Facades\Shipping::isMethodCodeExists($input->shippingMethod)) {
                        throw new OperationFailedException(__('bagistoapi::app.graphql.checkout.invalid-shipping-method'));
                    }
                    \Webkul\Shipping\Facades\Shipping::collectRates();

                    if (! Cart::saveShippingMethod($input->shippingMethod)) {
                        throw new OperationFailedException(__('bagistoapi::app.graphql.checkout.shipping-method-save-failed'));
                    }
                }
            }
            $this->validateStandardInitiation($cart, $input);
            Cart::collectTotals();
            $cart = Cart::getCart();
        }


        if (! $input->paymentMethod && ! $cart->payment?->method) {
            throw new OperationFailedException(__('bagistoapi::app.graphql.checkout.payment-method-required'));
        }

        if ($input->paymentMethod) {
            if (! Cart::savePaymentMethod(['method' => $input->paymentMethod])) {
                throw new OperationFailedException(__('bagistoapi::app.graphql.checkout.payment-method-save-failed'));
            }
            // Cart::collectTotals();
            $cart = Cart::getCart();
        }

        $oldCartId = $cart->id;
        $oldCartToken = $cart->guest_cart_token ?? null;

        $orderData = $express
            ? (new ExpressOrderResource($cart))->jsonSerialize()
            : (new OrderResource($cart))->jsonSerialize();

        $order = null;
        $gatewayOrderId = null;

        DB::transaction(function () use (
            &$order,
            &$gatewayOrderId,
            $cart,
            $input,
            $express,
            $orderData,
            $oldCartId,
            $oldCartToken
        ) {
            $order = $this->orderRepository->create($orderData);

            if (! $order || ! data_get($order, 'id')) {
                throw new OperationFailedException(__('bagistoapi::app.graphql.checkout.order-creation-failed'));
            }

            $order = $this->orderRepository->find($order->id);

            $gatewayOrderId = $this->createGatewayOrder($cart, $order, $input, $express);

            $this->stampPaymentAdditional($order, $gatewayOrderId, $express, $oldCartId, $oldCartToken);

            $this->recordAttempt([
                'order_id'         => $order->id,
                'cart_id'          => $oldCartId,
                'payment_method'   => $order->payment?->method,
                'gateway_order_id' => $gatewayOrderId,
                'action'           => PaymentAttempt::ACTION_INITIATE,
                'status'           => $gatewayOrderId ? PaymentAttempt::STATUS_REDIRECTED : PaymentAttempt::STATUS_CREATED,
                'amount'           => (float) ($order->grand_total ?? 0),
                'currency'         => $order->order_currency_code ?? $order->cart_currency_code,
                'express'          => $express,
            ]);
        });

        Cart::deActivateCart();
        $newCartToken = $this->cartTokenService->issueFreshCart($cart->customer_id);

        Event::dispatch('order.created.after', $order);
        Event::dispatch('bagistoapi.payment.initiated', $order);

        $this->scheduleReconciliation($order);

        return [
            'order'          => $order,
            'gatewayOrderId' => $gatewayOrderId,
            'newCartToken'   => $newCartToken,
            'express'        => $express,
        ];
    }

    /*
    |--------------------------------------------------------------------------
    | Callback (success / cancel / failure)
    |--------------------------------------------------------------------------
    */

    /**
     * Returns the persisted order plus a status string for the resolver.
     *
     * The cancel branch is handled here for the case where the frontend
     * lands on the cancel URL right after the gateway redirect. The
     * separate CancelOrderProcessor mutation handles user-initiated
     * cancels from the order list.
     */
    public function callback(PaymentCallbackInput $input): array
    {
        if (! $input->orderId) {
            throw new OperationFailedException(__('bagistoapi::app.graphql.payment.order-id-required'));
        }

        $order = $this->orderRepository->find($input->orderId);

        if (! $order) {
            throw new ResourceNotFoundException(__('bagistoapi::app.graphql.payment.order-not-found', ['id' => $input->orderId]));
        }

        $status = strtolower((string) $input->status);

        return match ($status) {
            'success' => $this->handleSuccess($order, $input),
            'cancel'  => $this->handleCancel($order, 'cancelled'),
            'failure' => $this->handleCancel($order, 'failed'),
            default   => throw new OperationFailedException(__('bagistoapi::app.graphql.payment.invalid-status', ['status' => $status])),
        };
    }

    /*
    |--------------------------------------------------------------------------
    | Replay (re-issue gateway order for pending Bagisto order)
    |--------------------------------------------------------------------------
    */

    public function replay(PaymentReplayInput $input, $customer = null): array
    {
        if (! $input->orderId) {
            throw new OperationFailedException(__('bagistoapi::app.graphql.payment.order-id-required'));
        }

        $order = $this->orderRepository->find($input->orderId);

        if (! $order) {
            throw new ResourceNotFoundException(__('bagistoapi::app.graphql.payment.order-not-found', ['id' => $input->orderId]));
        }

        if ($customer && $order->customer_id !== $customer->id) {
            throw new OperationFailedException(__('bagistoapi::app.graphql.payment.replay-not-allowed'));
        }

        if (! in_array($order->status, [Order::STATUS_PENDING, Order::STATUS_PENDING_PAYMENT], true)) {
            throw new OperationFailedException(__('bagistoapi::app.graphql.payment.not-pending', ['status' => $order->status]));
        }

        if ($input->paymentMethod) {
            if(!$order->payment->method!=$input->paymentMethod){

                $paymentMethodConfig = config('payment_methods.'.$input->paymentMethod);
                if (! $paymentMethodConfig || ! isset($paymentMethodConfig['class'])) {
                    throw new OperationFailedException(__('bagistoapi::app.graphql.checkout.invalid-payment-method'));
                }

                if (! $order->payment) {
                    throw new OperationFailedException(__('bagistoapi::app.graphql.checkout.payment-method-required'));
                }
                $order->payment->method = $input->paymentMethod;
                $order->payment->method_title = core()->getConfigData('sales.payment_methods.'.$input->paymentMethod.'.title');
                $order->payment->save();
                $order->refresh();

            }

        }

        $gatewayOrderId = $this->createGatewayOrderForOrder($order);

        $this->writeGatewayOrderId($order, $gatewayOrderId);

        $this->recordAttempt([
            'order_id'         => $order->id,
            'cart_id'          => $this->resolveOldCartId($order),
            'payment_method'   => $order->payment?->method,
            'gateway_order_id' => $gatewayOrderId,
            'action'           => PaymentAttempt::ACTION_REPLAY,
            'status'           => $gatewayOrderId ? PaymentAttempt::STATUS_REDIRECTED : PaymentAttempt::STATUS_CREATED,
            'amount'           => (float) ($order->grand_total ?? 0),
            'currency'         => $order->order_currency_code ?? $order->cart_currency_code,
            'express'          => $this->expressFlag($order),
        ]);

        $this->scheduleReconciliation($order);

        Event::dispatch('bagistoapi.payment.replayed', $order);

        return [
            'order'          => $order->fresh(),
            'gatewayOrderId' => $gatewayOrderId,
        ];
    }

    /*
    |--------------------------------------------------------------------------
    | Cancel strategy (used by CancelOrderProcessor)
    |--------------------------------------------------------------------------
    */

    /**
     * Decide what to do with a pending order when the cancel mutation
     * is invoked. Returns an array describing the action so the caller
     * can report it back to the client.
     */
    public function decideCancelStrategy($order, bool $isGuest): array
    {
        $hasShippingAddress = (bool) $order->shipping_address && ! $this->isPlaceholderAddress($order->shipping_address);

        if ($isGuest) {
            return [
                'action'   => 'cancel',
                'reason'   => 'guest',
                'reactivate_cart' => $this->resolveOldCartId($order),
            ];
        }

        if ($hasShippingAddress) {
            return [
                'action' => 'keep_pending',
                'reason' => 'customer_has_shipping_address',
            ];
        }

        $strategy = (string) config('bagistoapi.express_checkout.cancel_without_address', 'cancel');

        Event::dispatch('bagistoapi.express.cancel.no-address', [
            'order'    => $order,
            'strategy' => $strategy,
        ]);

        return [
            'action' => $strategy === 'keep_pending' ? 'keep_pending' : 'cancel',
            'reason' => 'customer_no_shipping_address',
        ];
    }

    /*
    |--------------------------------------------------------------------------
    | Internals
    |--------------------------------------------------------------------------
    */

    /**
     * Express validations: just the bare minimum to avoid cart/empty
     * orders. Address, email and shipping checks are skipped on
     * purpose - those come from the gateway success callback.
     */
    protected function validateExpressInitiation($cart, PaymentInitiateInput $input): void
    {
        if (auth()->guard('customer')->check()) {
            $customer = auth()->guard('customer')->user();
            if ($customer && $customer->is_suspended) {
                throw new OperationFailedException(__('bagistoapi::app.graphql.checkout.account-suspended'));
            }
            if ($customer && ! $customer->status) {
                throw new OperationFailedException(__('bagistoapi::app.graphql.checkout.account-inactive'));
            }
        }

        $minimumOrderAmount = core()->getConfigData('sales.order_settings.minimum_order.minimum_order_amount') ?: 0;
        if (! Cart::haveMinimumOrderAmount()) {
            throw new OperationFailedException(__('bagistoapi::app.graphql.checkout.minimum-order-not-met', ['amount' => core()->currency($minimumOrderAmount)]));
        }
    }

    /**
     * Mirror the existing CheckoutProcessor::validateOrderCreation but
     * scoped to initiate. Keeps strict parity with the legacy mutation.
     */
    protected function validateStandardInitiation($cart, PaymentInitiateInput $input): void
    {
        if (auth()->guard('customer')->check()) {
            $customer = auth()->guard('customer')->user();
            if ($customer && $customer->is_suspended) {
                throw new OperationFailedException(__('bagistoapi::app.graphql.checkout.account-suspended'));
            }
            if ($customer && ! $customer->status) {
                throw new OperationFailedException(__('bagistoapi::app.graphql.checkout.account-inactive'));
            }
        }

        $minimumOrderAmount = core()->getConfigData('sales.order_settings.minimum_order.minimum_order_amount') ?: 0;
        if (! Cart::haveMinimumOrderAmount()) {
            throw new OperationFailedException(__('bagistoapi::app.graphql.checkout.minimum-order-not-met', ['amount' => core()->currency($minimumOrderAmount)]));
        }

        $hasBillingAddress = $input->billingAddress || $cart->billing_address()->exists();
        if (! $hasBillingAddress) {
            throw new OperationFailedException(__('bagistoapi::app.graphql.checkout.billing-address-required'));
        }

        $hasShippingAddress = $input->shippingAddress || $input->useForShipping || $cart->shipping_address()->exists();
        if (! $hasShippingAddress && $cart->haveStockableItems()) {
            throw new OperationFailedException(__('bagistoapi::app.graphql.checkout.shipping-address-required'));
        }

        $hasEmail = $cart->customer_email || $input->billingEmail || ($cart->billing_address && $cart->billing_address->email);
        if (! $hasEmail) {
            throw new OperationFailedException(__('bagistoapi::app.graphql.checkout.email-required'));
        }

        if ($cart->haveStockableItems()) {
            $hasShippingMethod = $input->shippingMethod || $cart->shipping_method;
            if (! $hasShippingMethod) {
                throw new OperationFailedException(__('bagistoapi::app.graphql.checkout.shipping-method-required'));
            }

            if (! $cart->selected_shipping_rate) {
                throw new OperationFailedException(__('bagistoapi::app.graphql.checkout.invalid-shipping-method'));
            }
        }
    }

    /**
     * Currently we only know how to create a PayPal smart-button order.
     * Returning null is fine - other gateways may have a redirect-only
     * flow that does not need a pre-flight order id.
     */
    protected function createGatewayOrder($cart, $order, PaymentInitiateInput $input, bool $express): ?string
    {
        $method = $cart->payment?->method ?? $order->payment?->method;
        $gatewayHandler = $this->resolveGatewayHandler($method, $order, $input);
        if ($gatewayHandler) {
           return $gatewayHandler->createGatewayOrder();
        } else {
            if ($method !== 'paypal_smart_button') {
                return null;
            }

            $smartButton = app(SmartButton::class);
            $amount = $express
                ? max(0, (float) ($cart->sub_total ?? 0) - (float) ($cart->discount_amount ?? 0))
                : (float) ($order->grand_total ?? $cart->sub_total ?? 0);

            $response = $smartButton->createOrder([
                'intent'         => 'CAPTURE',
                'purchase_units' => [[
                    'reference_id' => (string) $cart->id,
                    'amount'       => [
                        'currency_code' => $cart->cart_currency_code,
                        'value'         => $smartButton->formatCurrencyValue($amount),
                    ],
                ]],
            ]);

            $gatewayOrderId = $response->result->id ?? null;

            if (! $gatewayOrderId) {
                throw new OperationFailedException(__('bagistoapi::app.graphql.payment.gateway-create-failed'));
            }

            return (string) $gatewayOrderId;
        }
    }
    /**
     * Variant used by replay() where there's no Cart - amount comes
     * straight from the existing order.
     */
    protected function createGatewayOrderForOrder($order): ?string
    {
        $method = $order->payment?->method;
        $gatewayHandler = $this->resolveGatewayHandler($method, $order);
        if ($gatewayHandler) {
            return $gatewayHandler->createGatewayOrder();
        } else {
            if ($method !== 'paypal_smart_button') {
                return null;
            }

            $smartButton = app(SmartButton::class);

            $response = $smartButton->createOrder([
                'intent'         => 'CAPTURE',
                'purchase_units' => [[
                    'reference_id' => (string) $order->id,
                    'amount'       => [
                        'currency_code' => $order->cart_currency_code ?? $order->order_currency_code,
                        'value'         => $smartButton->formatCurrencyValue((float) $order->grand_total),
                    ],
                ]],
            ]);

            $gatewayOrderId = $response->result->id ?? null;

            if (! $gatewayOrderId) {
                throw new OperationFailedException(__('bagistoapi::app.graphql.payment.gateway-create-failed'));
            }

            return (string) $gatewayOrderId;
        }
    }
    protected function resolveGatewayHandler(string $method, $order = null, PaymentInitiateInput $input = null): ?object
    {
        $config = config("payment_methods.{$method}");

        if (! $config || ! isset($config['class'])) {
            return null;
        }
        try {
            $handler = app($config['class']);
            if (method_exists($handler, 'setOrder')) {
                $handler->setOrder($order);
            }
            if (method_exists($handler, 'setInput')) {
                $handler->setInput($input);
            }
            if (! method_exists($handler, 'createGatewayOrder')) {
                Log::warning('Payment handler does not implement createGatewayOrder', [
                    'method' => $method,
                    'class'  => $config['class'],
                ]);
                return null;
            }
            return $handler;
        } catch (\Throwable $e) {
            Log::error('Failed to instantiate payment handler', [
                'method' => $method,
                'class'  => $config['class'] ?? null,
                'error'  => $e->getMessage(),
            ]);

            return null;
        }
    }

    /**
     * Persist the gateway order id + express flag + old cart id onto
     * order_payment.additional so callbacks/reconciliation have all the
     * context they need.
     */
    protected function stampPaymentAdditional($order, ?string $gatewayOrderId, bool $express, int $oldCartId, ?string $oldCartToken): void
    {
        if (! $order->payment) {
            return;
        }

        $additional = $order->payment->additional ?? [];

        if ($gatewayOrderId) {
            $additional['paypal_order_id'] = $gatewayOrderId;
            $additional['gateway_order_id'] = $gatewayOrderId;
        }

        $additional['express'] = $express;
        $additional['cart_id'] = $oldCartId;

        if ($oldCartToken) {
            $additional['cart_token'] = $oldCartToken;
        }

        $order->payment->additional = $additional;
        $order->payment->save();
    }

    protected function writeGatewayOrderId($order, ?string $gatewayOrderId): void
    {
        if (! $order->payment || ! $gatewayOrderId) {
            return;
        }

        $additional = $order->payment->additional ?? [];
        $additional['paypal_order_id'] = $gatewayOrderId;
        $additional['gateway_order_id'] = $gatewayOrderId;
        $order->payment->additional = $additional;
        $order->payment->save();
    }

    protected function scheduleReconciliation($order): void
    {
        if (! config('bagistoapi.reconcile.enabled', true)) {
            return;
        }

        $delay = (int) config('bagistoapi.reconcile.delay_minutes', 15);
        $queue = (string) config('bagistoapi.reconcile.queue', 'payment-reconcile');

        try {
            $job = (new ReconcilePendingPaymentJob($order->id))
                ->onQueue($queue)
                ->delay(now()->addMinutes($delay));

            dispatch($job);
        } catch (\Throwable $e) {
            Log::warning('Failed to enqueue ReconcilePendingPaymentJob: '.$e->getMessage(), [
                'order_id' => $order->id,
            ]);
        }
    }

    /**
     * Success branch: capture the gateway order, verify the captured
     * amount, fill in express addresses, flip the order to processing
     * and generate the invoice + settled transaction record.
     *
     * Idempotent: a second (possibly concurrent) success callback for an
     * order that is already past pending short-circuits to success
     * without re-capturing. Concurrency is serialized via a row lock.
     */
    protected function handleSuccess($order, PaymentCallbackInput $input): array
    {
        if (! $this->isPending($order)) {
            return $this->successResponse($order, 'already_processed');
        }

        $additional = $order->payment?->additional ?? [];
        $isExpress = ! empty($additional['express']);
        $method = $order->payment?->method;
        $gatewayOrderId = $input->gatewayOrderId ?: ($additional['paypal_order_id'] ?? null);

        try {
            $result = DB::transaction(function () use ($order, $input, $isExpress, $method, $gatewayOrderId) {
                /*
                 * Lock the order row so concurrent success callbacks
                 * serialize here; the second one will see PROCESSING
                 * after acquiring the lock and short-circuit below.
                 */
                $orderModelClass = OrderProxy::modelClass();
                $orderModelClass::query()->whereKey($order->id)->lockForUpdate()->first();

                $order->refresh();

                if (! $this->isPending($order)) {
                    return ['skipped' => true, 'capture' => null, 'response' => $this->successResponse($order, 'already_processed')];
                }

                $capture = null;

                if ($method === 'paypal_smart_button') {
                    if (! $gatewayOrderId) {
                        throw new OperationFailedException(__('bagistoapi::app.graphql.payment.gateway-order-id-required'));
                    }

                    $capture = $this->captureAndVerify($order, $gatewayOrderId);
                }

                if ($isExpress) {
                    $this->fillAddressesFromCallback($order, $input);
                }

                if ($capture && ! empty($capture['transaction_id'])) {
                    $this->writeTransactionId($order, (string) $capture['transaction_id']);
                }

                $this->orderRepository->updateOrderStatus($order, Order::STATUS_PROCESSING);

                $invoice = $this->createInvoiceIfPossible($order);

                if ($capture) {
                    $this->recordOrderTransaction($order, $invoice, $capture);
                }

                $order->refresh();

                return ['skipped' => false, 'capture' => $capture, 'response' => $this->successResponse($order, 'captured')];
            });
        } catch (OperationFailedException $e) {
            /*
             * Recorded outside the rolled-back transaction so the audit
             * trail survives the failure.
             */
            $this->recordAttempt([
                'order_id'         => $order->id,
                'cart_id'          => $this->resolveOldCartId($order),
                'payment_method'   => $method,
                'gateway_order_id' => $gatewayOrderId,
                'action'           => PaymentAttempt::ACTION_CALLBACK,
                'status'           => PaymentAttempt::STATUS_FAILED,
                'amount'           => (float) ($order->grand_total ?? 0),
                'currency'         => $order->order_currency_code ?? $order->cart_currency_code,
                'express'          => $isExpress,
                'response_payload' => ['error' => $e->getMessage()],
            ]);

            throw $e;
        }

        if (empty($result['skipped'])) {
            $this->recordAttempt([
                'order_id'         => $order->id,
                'cart_id'          => $this->resolveOldCartId($order),
                'payment_method'   => $method,
                'gateway_order_id' => $gatewayOrderId,
                'action'           => PaymentAttempt::ACTION_CALLBACK,
                'status'           => PaymentAttempt::STATUS_CAPTURED,
                'amount'           => (float) ($order->grand_total ?? 0),
                'currency'         => $order->order_currency_code ?? $order->cart_currency_code,
                'express'          => $isExpress,
                'idempotency_key'  => $gatewayOrderId ? 'capture:'.$gatewayOrderId : null,
                'response_payload' => $result['capture'] ?? null,
            ]);

            Event::dispatch('bagistoapi.payment.success', $result['response']['order']);
        }

        return $result['response'];
    }

    /**
     * Cancel/failure branch: keep the order in PENDING and let the
     * caller decide whether to actually cancel it via the dedicated
     * cancelOrder mutation. This keeps cancel logic in one place.
     */
    protected function handleCancel($order, string $reason): array
    {
        $this->recordAttempt([
            'order_id'         => $order->id,
            'cart_id'          => $this->resolveOldCartId($order),
            'payment_method'   => $order->payment?->method,
            'gateway_order_id' => $this->gatewayOrderIdFromOrder($order),
            'action'           => PaymentAttempt::ACTION_CALLBACK,
            'status'           => $reason === 'cancelled' ? PaymentAttempt::STATUS_CANCELLED : PaymentAttempt::STATUS_FAILED,
            'amount'           => (float) ($order->grand_total ?? 0),
            'currency'         => $order->order_currency_code ?? $order->cart_currency_code,
            'express'          => $this->expressFlag($order),
        ]);

        Event::dispatch('bagistoapi.payment.cancelled', ['order' => $order, 'reason' => $reason]);

        return [
            'order'         => $order,
            'status'        => $reason,
            'gatewayStatus' => $reason,
            'message'       => __('bagistoapi::app.graphql.payment.'.$reason),
        ];
    }

    /**
     * Capture the PayPal order then assert the gateway reported a
     * completed capture whose amount/currency match the Bagisto order.
     * Returns a normalized capture array for persistence/audit.
     */
    protected function captureAndVerify($order, string $gatewayOrderId): array
    {
        try {
            $response = app(SmartButton::class)->captureOrder($gatewayOrderId);
        } catch (\Throwable $e) {
            Log::error('PayPal capture failed: '.$e->getMessage(), [
                'order_id'         => $order->id,
                'gateway_order_id' => $gatewayOrderId,
            ]);

            throw new OperationFailedException(__('bagistoapi::app.graphql.payment.gateway-capture-failed'));
        }

        $capture = $this->extractCapture($response);

        $orderStatus = strtoupper((string) ($capture['order_status'] ?? ''));
        $captureStatus = strtoupper((string) ($capture['capture_status'] ?? ''));

        $completed = in_array($orderStatus, ['COMPLETED', 'CAPTURED'], true)
            || in_array($captureStatus, ['COMPLETED', 'CAPTURED'], true);

        if (! $completed) {
            Event::dispatch('bagistoapi.payment.capture-not-completed', ['order' => $order, 'capture' => $capture]);

            Log::error('PayPal capture not completed', [
                'order_id'       => $order->id,
                'order_status'   => $orderStatus,
                'capture_status' => $captureStatus,
            ]);

            throw new OperationFailedException(__('bagistoapi::app.graphql.payment.capture-not-completed'));
        }

        $this->assertAmountMatches($order, $capture);

        return $capture;
    }

    /**
     * Normalize a PayPal capture response into a flat array.
     */
    protected function extractCapture($response): array
    {
        $data = json_decode(json_encode($response), true) ?: [];
        $result = $data['result'] ?? [];

        $purchaseUnit = $result['purchase_units'][0] ?? [];
        $captureNode = $purchaseUnit['payments']['captures'][0] ?? [];

        $amount = $captureNode['amount']['value'] ?? $purchaseUnit['amount']['value'] ?? null;
        $currency = $captureNode['amount']['currency_code'] ?? $purchaseUnit['amount']['currency_code'] ?? null;

        return [
            'transaction_id'   => $captureNode['id'] ?? $result['id'] ?? null,
            'gateway_order_id' => $result['id'] ?? null,
            'order_status'     => $result['status'] ?? null,
            'capture_status'   => $captureNode['status'] ?? null,
            'intent'           => $result['intent'] ?? 'CAPTURE',
            'amount'           => $amount !== null ? (float) $amount : null,
            'currency'         => $currency,
            'raw'              => $result,
        ];
    }

    /**
     * Guard against an under-payment / wrong-currency capture before we
     * mark the order as paid.
     */
    protected function assertAmountMatches($order, array $capture): void
    {
        $expected = round((float) ($order->grand_total ?? 0), 2);
        $captured = isset($capture['amount']) && $capture['amount'] !== null
            ? round((float) $capture['amount'], 2)
            : null;

        $expectedCurrency = strtoupper((string) ($order->order_currency_code ?? $order->cart_currency_code ?? ''));
        $capturedCurrency = strtoupper((string) ($capture['currency'] ?? ''));

        $amountOk = $captured !== null && abs($captured - $expected) < 0.01;
        $currencyOk = $capturedCurrency === '' || $expectedCurrency === '' || $capturedCurrency === $expectedCurrency;

        if ($amountOk && $currencyOk) {
            return;
        }

        Event::dispatch('bagistoapi.payment.amount-mismatch', [
            'order'    => $order,
            'expected' => $expected,
            'captured' => $captured,
            'capture'  => $capture,
        ]);

        Log::error('PayPal capture amount mismatch', [
            'order_id'          => $order->id,
            'expected'          => $expected,
            'captured'          => $captured,
            'expected_currency' => $expectedCurrency,
            'captured_currency' => $capturedCurrency,
        ]);

        throw new OperationFailedException(__('bagistoapi::app.graphql.payment.amount-mismatch'));
    }

    /**
     * Create the invoice for a fully-captured order, mirroring the
     * native PayPal SmartButtonController behaviour.
     */
    protected function createInvoiceIfPossible($order)
    {
        if (! $order->canInvoice()) {
            return null;
        }

        $invoiceData = ['order_id' => $order->id];

        foreach ($order->items as $item) {
            $invoiceData['invoice']['items'][$item->id] = $item->qty_to_invoice;
        }

        return $this->invoiceRepository->create($invoiceData);
    }

    /**
     * Persist the settled transaction. Unlike payment_attempts, this row
     * is tied to an invoice and represents money actually received.
     */
    protected function recordOrderTransaction($order, $invoice, array $capture): void
    {
        if (! $invoice || empty($capture['transaction_id'])) {
            return;
        }

        try {
            $this->orderTransactionRepository->create([
                'transaction_id' => (string) $capture['transaction_id'],
                'status'         => $capture['capture_status'] ?? $capture['order_status'] ?? null,
                'type'           => $capture['intent'] ?? 'CAPTURE',
                'amount'         => $capture['amount'] ?? $order->grand_total,
                'payment_method' => $order->payment?->method,
                'order_id'       => $order->id,
                'invoice_id'     => $invoice->id,
                'data'           => json_encode($capture['raw'] ?? $capture),
            ]);
        } catch (\Throwable $e) {
            Log::warning('Failed to record order transaction: '.$e->getMessage(), [
                'order_id' => $order->id,
            ]);
        }
    }

    /**
     * Store the gateway transaction id on order_payment.additional for
     * later refunds (avoids a round-trip to re-fetch the capture id).
     */
    protected function writeTransactionId($order, string $transactionId): void
    {
        if (! $order->payment) {
            return;
        }

        $additional = $order->payment->additional ?? [];
        $additional['transaction_id'] = $transactionId;
        $order->payment->additional = $additional;
        $order->payment->save();
    }

    /**
     * Persist a payment_attempts row. Never let an audit-write failure
     * break the payment flow.
     */
    protected function recordAttempt(array $data): ?PaymentAttempt
    {
        try {
            return $this->paymentAttemptRepository->create($data);
        } catch (\Throwable $e) {
            Log::warning('Failed to record payment attempt: '.$e->getMessage(), [
                'order_id' => $data['order_id'] ?? null,
                'action'   => $data['action'] ?? null,
            ]);

            return null;
        }
    }

    protected function isPending($order): bool
    {
        return in_array($order->status, [Order::STATUS_PENDING, Order::STATUS_PENDING_PAYMENT], true);
    }

    protected function successResponse($order, string $gatewayStatus): array
    {
        return [
            'order'         => $order,
            'status'        => 'success',
            'gatewayStatus' => $gatewayStatus,
            'message'       => __('bagistoapi::app.graphql.payment.success'),
        ];
    }

    protected function gatewayOrderIdFromOrder($order): ?string
    {
        $additional = $order->payment?->additional ?? [];

        return $additional['paypal_order_id'] ?? $additional['gateway_order_id'] ?? null;
    }

    protected function expressFlag($order): bool
    {
        $additional = $order->payment?->additional ?? [];

        return ! empty($additional['express']);
    }

    /**
     * Replace the placeholder addresses with the real ones we got back
     * from the gateway. Only used for express orders.
     */
    protected function fillAddressesFromCallback($order, PaymentCallbackInput $input): void
    {
        $billing = $this->buildAddressPayloadFromCallback($input, 'billing');
        $shipping = $this->buildAddressPayloadFromCallback($input, 'shipping');

        if ($shipping) {
            $order->shipping_address?->update($shipping);
        }

        if ($billing) {
            $order->billing_address?->update($billing);
        }

        if (! empty($billing['email'])) {
            $order->customer_email = $billing['email'];
        }
        if (! empty($billing['first_name'])) {
            $order->customer_first_name = $billing['first_name'];
        }
        if (! empty($billing['last_name'])) {
            $order->customer_last_name = $billing['last_name'];
        }

        $order->save();
    }

    /**
     * Pull billing/shipping fields off the callback DTO and translate
     * them to the snake_case column names used by OrderAddress.
     */
    protected function buildAddressPayloadFromCallback(PaymentCallbackInput $input, string $type): array
    {
        $fields = [
            'first_name' => $type.'FirstName',
            'last_name'  => $type.'LastName',
            'email'      => $type.'Email',
            'address'    => $type.'Address',
            'country'    => $type.'Country',
            'state'      => $type.'State',
            'city'       => $type.'City',
            'postcode'   => $type.'Postcode',
            'phone'      => $type.'PhoneNumber',
        ];

        $payload = [];
        foreach ($fields as $column => $property) {
            $value = $input->{$property} ?? null;
            if ($value !== null && $value !== '') {
                $payload[$column] = $value;
            }
        }

        return $payload;
    }

    /**
     * Heuristic check: the placeholder city/postcode is unlikely to
     * collide with a real address; we use this to decide whether the
     * express order really has a usable shipping address.
     */
    protected function isPlaceholderAddress($address): bool
    {
        $placeholder = (array) config('bagistoapi.express_checkout.placeholder_address', []);

        if (empty($placeholder)) {
            return false;
        }

        return ($address->city ?? null) === ($placeholder['city'] ?? null)
            && ($address->postcode ?? null) === ($placeholder['postcode'] ?? null);
    }

    protected function resolveOldCartId($order): ?int
    {
        $additional = $order->payment?->additional ?? [];

        $cartId = $additional['cart_id'] ?? null;

        return $cartId ? (int) $cartId : null;
    }
}