<?php
declare(strict_types=1);

namespace Esun\Reward\Plugin\Checkout;

use Amasty\CheckoutCore\Block\Onepage\LayoutProcessor;

/**
 * Places checkout promotions inside Order Summary, directly before totals.
 */
class SummaryLayoutProcessorPlugin
{
    public function afterProcess(LayoutProcessor $subject, array $jsLayout): array
    {
        $checkout = &$jsLayout['components']['checkout']['children'];
        $sidebar = &$checkout['sidebar']['children'];
        $summary = &$sidebar['summary']['children'];

        if (!is_array($summary)) {
            return $jsLayout;
        }

        $summary['cart_items']['sortOrder'] = 10;

        // Amasty moves Magento's coupon component to summary_additional, which
        // renders after totals. Move that same component above totals instead.
        $additional = &$sidebar['summary_additional']['children'];
        if (isset($additional['discount']) && is_array($additional['discount'])) {
            $discount = $additional['discount'];
            unset($additional['discount']);
            $discount['sortOrder'] = 20;
            $discount['config']['template'] = 'Magento_SalesRule/payment/discount';
            $summary['discount-code'] = $discount;
        }

        // Depending on Amasty configuration, third-party payment additions can
        // be moved or renamed before this processor finishes. Extract the
        // component wherever it ended up; create it when Amasty removed it.
        $reward = $this->extractComponent(
            $checkout,
            'Esun_Reward/js/view/payment/reward'
        ) ?? [
            'component' => 'Esun_Reward/js/view/payment/reward'
        ];
        $reward['sortOrder'] = 21;
        $summary['esun-reward'] = $reward;

        // Amasty supplies an expandable details template. Use the theme's
        // always-open Magento template so product options display immediately.
        if (isset($summary['cart_items']['children']['details'])) {
            $summary['cart_items']['children']['details']['config']['template'] =
                'Magento_Checkout/summary/item/details';
        }

        $summary['totals']['sortOrder'] = 30;

        return $jsLayout;
    }

    private function extractComponent(array &$node, string $component): ?array
    {
        foreach (array_keys($node) as $key) {
            if (!isset($node[$key]) || !is_array($node[$key])) {
                continue;
            }

            if (($node[$key]['component'] ?? null) === $component) {
                $result = $node[$key];
                unset($node[$key]);
                return $result;
            }

            $result = $this->extractComponent($node[$key], $component);
            if ($result !== null) {
                return $result;
            }
        }

        return null;
    }
}