<?php
declare(strict_types=1);

namespace Esun\Reward\Model\Import;

use Esun\Reward\Model\BalanceManager;
use Magento\Framework\App\Config\ScopeConfigInterface;
use Magento\Framework\App\ResourceConnection;
use Magento\Framework\Serialize\Serializer\Json;
use Magento\Framework\Stdlib\StringUtils;
use Magento\ImportExport\Model\Import as ImportModel;
use Magento\ImportExport\Model\Import\AbstractEntity;
use Magento\ImportExport\Model\Import\ErrorProcessing\ProcessingErrorAggregatorInterface;
use Magento\ImportExport\Model\ImportFactory;
use Magento\ImportExport\Model\ResourceModel\Helper;

class Reward extends AbstractEntity
{
    public const ENTITY_CODE = 'esun_reward';
    public const COL_EMAIL = 'email';
    public const COL_TIER = 'member_tier';
    public const COL_POINTS = 'points';
    private const ERROR_EMAIL = 'rewardInvalidEmail';
    private const ERROR_TIER = 'rewardInvalidTier';
    private const ERROR_POINTS = 'rewardInvalidPoints';
    private const ERROR_NOT_FOUND = 'rewardCustomerNotFound';
    private const ERROR_MULTIPLE = 'rewardCustomerMultipleWebsites';
    private const ERROR_DUPLICATE = 'rewardDuplicateEmail';
    private const TIER_MAP = [
        'VIP I' => 'bronze', 'BRONZE MAKER' => 'bronze',
        'VIP II' => 'silver', 'SILVER MAKER' => 'silver',
        'VIP III' => 'gold', 'GOLD MAKER' => 'gold',
    ];

    protected $needColumnCheck = true;
    protected $validColumnNames = [self::COL_EMAIL, self::COL_TIER, self::COL_POINTS];
    protected $_availableBehaviors = [ImportModel::BEHAVIOR_APPEND];
    protected $masterAttributeCode = self::COL_EMAIL;
    private array $seenEmails = [];

    public function __construct(
        StringUtils $string,
        ScopeConfigInterface $scopeConfig,
        ImportFactory $importFactory,
        Helper $resourceHelper,
        ResourceConnection $resource,
        ProcessingErrorAggregatorInterface $errorAggregator,
        private readonly ResourceConnection $rewardResource,
        private readonly BalanceManager $balances,
        array $data = [],
        ?Json $serializer = null
    ) {
        parent::__construct($string, $scopeConfig, $importFactory, $resourceHelper, $resource, $errorAggregator, $data, $serializer);
        $this->addMessageTemplate(self::ERROR_EMAIL, 'Email format is invalid');
        $this->addMessageTemplate(self::ERROR_TIER, 'Member tier is invalid; use VIP I/II/III or Bronze/Silver/Gold Maker');
        $this->addMessageTemplate(self::ERROR_POINTS, 'Points must be a non-negative integer');
        $this->addMessageTemplate(self::ERROR_NOT_FOUND, '未找到该邮箱对应的客户');
        $this->addMessageTemplate(self::ERROR_MULTIPLE, '该邮箱存在于多个 Website，请人工确认归属');
        $this->addMessageTemplate(self::ERROR_DUPLICATE, 'CSV 中邮箱重复');
    }

    public function getEntityTypeCode(): string { return self::ENTITY_CODE; }

    public function validateRow(array $rowData, $rowNumber): bool
    {
        if (isset($this->_validatedRows[$rowNumber])) {
            return !$this->getErrorAggregator()->isRowInvalid($rowNumber);
        }
        $this->_validatedRows[$rowNumber] = true;
        $email = strtolower(trim((string)($rowData[self::COL_EMAIL] ?? '')));
        $tier = $this->normalizeTier((string)($rowData[self::COL_TIER] ?? ''));
        $points = trim((string)($rowData[self::COL_POINTS] ?? ''));
        if (!filter_var($email, FILTER_VALIDATE_EMAIL)) { $this->addRowError(self::ERROR_EMAIL, $rowNumber, self::COL_EMAIL); }
        if ($tier === null) { $this->addRowError(self::ERROR_TIER, $rowNumber, self::COL_TIER); }
        if (!preg_match('/^\d+$/', $points)) { $this->addRowError(self::ERROR_POINTS, $rowNumber, self::COL_POINTS); }
        if ($email !== '') {
            if (isset($this->seenEmails[$email])) { $this->addRowError(self::ERROR_DUPLICATE, $rowNumber, self::COL_EMAIL); }
            $this->seenEmails[$email] = true;
            $count = count($this->findCustomers($email));
            if ($count === 0) { $this->addRowError(self::ERROR_NOT_FOUND, $rowNumber, self::COL_EMAIL); }
            if ($count > 1) { $this->addRowError(self::ERROR_MULTIPLE, $rowNumber, self::COL_EMAIL); }
        }
        return !$this->getErrorAggregator()->isRowInvalid($rowNumber);
    }

    protected function _importData()
    {
        $batchId = 'admin-import-' . gmdate('YmdHis') . '-' . bin2hex(random_bytes(4));
        while ($bunch = $this->_dataSourceModel->getNextUniqueBunch($this->getIds())) {
            foreach ($bunch as $rowNumber => $rowData) {
                if (!$this->validateRow($rowData, $rowNumber)) { continue; }
                $email = strtolower(trim((string)$rowData[self::COL_EMAIL]));
                $customers = $this->findCustomers($email);
                $customer = reset($customers);
                $this->balances->importLegacySnapshot(
                    (int)$customer['entity_id'], (int)$customer['website_id'], (int)$rowData[self::COL_POINTS],
                    (string)$this->normalizeTier((string)$rowData[self::COL_TIER]), $batchId,
                    ['source' => 'admin_import', 'source_row' => $rowNumber, 'source_email' => $email]
                );
                $this->countItemsUpdated++;
            }
        }
        return true;
    }

    private function normalizeTier(string $value): ?string
    {
        $label = strtoupper((string)preg_replace('/\s+/', ' ', trim($value)));
        return self::TIER_MAP[$label] ?? null;
    }

    /** @return array<int,array{entity_id:string,website_id:string}> */
    private function findCustomers(string $email): array
    {
        $table = $this->rewardResource->getTableName('customer_entity');
        return $this->rewardResource->getConnection()->fetchAll(
            $this->rewardResource->getConnection()->select()
                ->from($table, ['entity_id', 'website_id'])
                ->where('LOWER(email) = ?', strtolower(trim($email)))
        );
    }
}