<?php
declare(strict_types=1);

namespace Esun\Reward\Observer;

use Esun\Reward\Model\BalanceManager;
use Esun\Reward\Model\Config;
use Magento\Framework\App\ResourceConnection;
use Magento\Framework\Event\Observer;
use Magento\Framework\Event\ObserverInterface;
use Magento\Customer\Api\CustomerRepositoryInterface;

class AwardFirstAddressPoints implements ObserverInterface
{
    public function __construct(
        private readonly BalanceManager $balanceManager,
        private readonly Config $config,
        private readonly ResourceConnection $resource,
        private readonly CustomerRepositoryInterface $customers
    ) {}

    public function execute(Observer $observer): void
    {
        $address = $observer->getEvent()->getCustomerAddress();
        $customerId = (int)($address?->getCustomerId() ?? 0);
        if (!$this->config->isEnabled() || $customerId <= 0 || !$this->isComplete($address)) { return; }
        $connection = $this->resource->getConnection();
        $count = (int)$connection->fetchOne($connection->select()->from($this->resource->getTableName('customer_address_entity'), ['COUNT(*)'])->where('parent_id = ?', $customerId));
        if ($count > 1) { return; }
        $websiteId = (int)$this->customers->getById($customerId)->getWebsiteId();
        $rule = $this->config->earningRule('first_shipping_address');
        $this->balanceManager->change($customerId, $websiteId, (int)$rule['points'], 'first_shipping_address', 'first_shipping_address:' . $customerId, [
            'reference_type' => 'customer_address', 'reference_id' => (int)$address->getId(), 'reason' => (string)__($rule['reason'])
        ]);
    }

    private function isComplete(mixed $address): bool
    {
        return $address && trim((string)$address->getCountryId()) !== '' && trim((string)$address->getCity()) !== ''
            && trim((string)$address->getPostcode()) !== '' && trim((string)$address->getTelephone()) !== ''
            && count(array_filter((array)$address->getStreet(), static fn ($value) => trim((string)$value) !== '')) > 0;
    }
}