<?php

/**
 * Checkout Endpoint for Agentic Commerce.
 *
 * POST /api/paypal/v1/merchant-cart/{cartId}/checkout
 *
 * @package WooCommerce\PayPalCommerce\StoreSync\Endpoint
 */
declare (strict_types=1);
namespace WooCommerce\PayPalCommerce\StoreSync\Endpoint;

use WC_Order;
use WP_Error;
use WP_REST_Request;
use WP_REST_Response;
use WooCommerce\PayPalCommerce\Vendor\Psr\Log\LoggerInterface;
use WooCommerce\PayPalCommerce\StoreSync\Errors\AgenticError;
use WooCommerce\PayPalCommerce\StoreSync\Errors\Http\InternalServerError;
use WooCommerce\PayPalCommerce\StoreSync\Validation\Context\PaymentErrorContext;
use WooCommerce\PayPalCommerce\StoreSync\Validation\StoreValidation;
use WooCommerce\PayPalCommerce\StoreSync\Validation\ValidationIssue;
use WooCommerce\PayPalCommerce\StoreSync\Schema\PaymentMethod;
use WooCommerce\PayPalCommerce\StoreSync\Helper\AgenticSessionManager;
use WooCommerce\PayPalCommerce\StoreSync\Helper\AgenticCheckoutProcessor;
use WooCommerce\PayPalCommerce\StoreSync\Helper\PayPalOrderManager;
use WooCommerce\PayPalCommerce\StoreSync\CartValidation\CartValidationProcessor;
use WooCommerce\PayPalCommerce\StoreSync\Auth\AuthServiceProvider;
use WooCommerce\PayPalCommerce\StoreSync\Session\AgenticSessionHandler;
use WooCommerce\PayPalCommerce\StoreSync\Response\ResponseFactory;
use WooCommerce\PayPalCommerce\StoreSync\StoreData\StoreData;
use WooCommerce\PayPalCommerce\StoreSync\StoreData\StorePayPalCart;
/**
 * Checkout REST endpoint.
 */
class CheckoutEndpoint extends \WooCommerce\PayPalCommerce\StoreSync\Endpoint\AgenticRestEndpoint
{
    /**
     * The endpoint path following PayPal specs.
     */
    protected const PATH = 'merchant-cart/(?P<cart_id>[a-zA-Z0-9_-]+)/checkout';
    /**
     * The expected HTTP method.
     */
    protected const METHOD = 'POST';
    protected AgenticCheckoutProcessor $checkout_processor;
    public function __construct(AuthServiceProvider $auth_provider, AgenticSessionHandler $session_handler, AgenticSessionManager $session_manager, ResponseFactory $response_factory, CartValidationProcessor $validation_processor, LoggerInterface $logger, PayPalOrderManager $order_manager, StoreData $store_data, AgenticCheckoutProcessor $checkout_processor)
    {
        parent::__construct($auth_provider, $session_handler, $session_manager, $response_factory, $validation_processor, $logger, $order_manager, $store_data);
        $this->checkout_processor = $checkout_processor;
    }
    /**
     * Register REST API routes.
     *
     * @return void
     */
    public function register_routes(): void
    {
        register_rest_route(self::NAMESPACE, self::PATH, array('methods' => self::METHOD, 'callback' => fn($request) => $this->with_session(fn() => $this->complete_checkout($request)), 'permission_callback' => fn($request) => $this->check_permission($request), 'args' => array('cart_id' => $this->get_cart_id_arg())));
    }
    /**
     * Complete the checkout process.
     *
     * @param WP_REST_Request $request The REST request.
     * @return WP_REST_Response The REST response.
     */
    public function complete_checkout(WP_REST_Request $request): WP_REST_Response
    {
        $cart_id = $request->get_param('cart_id');
        $data = $this->parse_json_body($request);
        if ($data instanceof AgenticError) {
            return $this->error($data);
        }
        // TODO: Move this into a validator to add a PAYMENT_ERROR, which we can check here.
        $pm_validation = new StoreValidation();
        $payment_method = PaymentMethod::from_array((array) ($data['payment_method'] ?? array()), $pm_validation);
        if (!$pm_validation->is_empty()) {
            return $this->error(new InternalServerError('Payment method is required for checkout', $pm_validation->all()));
        }
        $session = $this->get_stored_cart($cart_id);
        if ($session instanceof AgenticError) {
            return $this->error($session);
        }
        // Parse the incoming cart data.
        $store_cart = $this->get_cart_from_request($request);
        if ($store_cart instanceof AgenticError) {
            return $this->error($store_cart);
        }
        $store_cart->set_paypal_order($session['ec_token']);
        $validation = $store_cart->validation();
        // If the cart has _any_ validation issue, stop here.
        if (!$validation->is_empty()) {
            return $this->cart_details($this->response_factory->from_cart($store_cart, $cart_id), 200);
        }
        $order = $this->create_wc_order($store_cart, $payment_method, $session['ec_token']);
        if (is_wp_error($order)) {
            // TODO: Refactor this to use $validation->add_payment_error().
            $issue = ValidationIssue::create_payment_error($order->get_error_message())->add_context(PaymentErrorContext::create_payment_declined()->decline_reason((string) $order->get_error_code()));
            $validation->add($issue);
            return $this->cart_details($this->response_factory->from_cart($store_cart, $cart_id), 200);
        }
        $this->flush_local_cart($cart_id);
        $response = $this->response_factory->from_order($order, $store_cart, $cart_id);
        return $this->cart_details($response, 200);
    }
    /**
     * Create a WooCommerce order from the cart data.
     *
     * Delegates to the AgenticCheckoutProcessor service which handles:
     * 1. Fetching the PayPal Order using the token (order ID)
     * 2. Translating PayPalCart to WC_Cart
     * 3. Creating WooCommerce order
     * 4. Linking PayPal and WC orders
     * 5. Capturing payment
     * 6. Cleaning up temporary cart
     *
     * @param StorePayPalCart $store_cart      The enriched cart data.
     * @param PaymentMethod   $payment_method  The payment method data.
     * @param string          $paypal_order_id The PayPal Order ID (ec_token).
     * @return WC_Order|WP_Error The created order or error.
     */
    private function create_wc_order(StorePayPalCart $store_cart, PaymentMethod $payment_method, string $paypal_order_id)
    {
        return $this->checkout_processor->process($store_cart, $payment_method, $paypal_order_id);
    }
}
