<?php
declare(strict_types=1);

namespace Esun\CustomerCoupon\Controller\Adminhtml\Customer;

use Magento\Backend\App\Action;
use Magento\Backend\App\Action\Context;
use Magento\Customer\Model\ResourceModel\Customer\CollectionFactory;
use Magento\Framework\Controller\Result\Json;
use Magento\Framework\Controller\Result\JsonFactory;
use Magento\SalesRule\Model\RuleFactory;

class Search extends Action
{
    public const ADMIN_RESOURCE = 'Magento_SalesRule::quote';

    public function __construct(
        Context $context,
        private readonly JsonFactory $jsonFactory,
        private readonly CollectionFactory $customerCollectionFactory,
        private readonly RuleFactory $ruleFactory
    ) {
        parent::__construct($context);
    }

    public function execute(): Json
    {
        $searchKey = trim((string)$this->getRequest()->getParam('searchKey', ''));
        $page = max(1, (int)$this->getRequest()->getParam('page', 1));
        $limit = min(50, max(1, (int)$this->getRequest()->getParam('limit', 20)));
        $ruleId = (int)$this->getRequest()->getParam('rule_id');

        $collection = $this->customerCollectionFactory->create();
        $collection->addAttributeToSelect(['firstname', 'lastname', 'email']);

        if ($ruleId) {
            $rule = $this->ruleFactory->create()->load($ruleId);
            if ($rule->getId()) {
                $collection->addFieldToFilter('website_id', ['in' => array_map('intval', $rule->getWebsiteIds())]);
                $collection->addFieldToFilter('group_id', ['in' => array_map('intval', $rule->getCustomerGroupIds())]);
            }
        }

        if ($searchKey !== '') {
            $like = '%' . addcslashes($searchKey, '%_') . '%';
            $conditions = [
                ['attribute' => 'email', 'like' => $like],
                ['attribute' => 'firstname', 'like' => $like],
                ['attribute' => 'lastname', 'like' => $like],
            ];
            if (ctype_digit($searchKey)) {
                $conditions[] = ['attribute' => 'entity_id', 'eq' => (int)$searchKey];
            }
            $collection->addAttributeToFilter($conditions, null, 'left');
        }

        $collection->setOrder('entity_id', 'DESC')->setPageSize($limit)->setCurPage($page);
        $options = [];
        foreach ($collection as $customer) {
            $name = trim((string)$customer->getFirstname() . ' ' . (string)$customer->getLastname());
            $options[] = [
                'value' => (int)$customer->getId(),
                'label' => sprintf('%s <%s> (#%d)', $name ?: __('Customer'), $customer->getEmail(), $customer->getId()),
                'path' => '',
                'level' => 0,
            ];
        }

        return $this->jsonFactory->create()->setData([
            'options' => $options,
            'total' => (int)$collection->getSize(),
        ]);
    }
}