<?php
declare(strict_types=1);

namespace Esun\Catalog\Model;

use Esun\Catalog\Model\ResourceModel\SpecificationFile as SpecificationFileResource;
use Esun\Catalog\Model\ResourceModel\SpecificationFile\CollectionFactory as SpecificationFileCollectionFactory;
use Esun\Catalog\Model\ResourceModel\SpecificationImport\CollectionFactory as SpecificationImportCollectionFactory;
use Magento\Framework\Exception\LocalizedException;

class SpecificationZipImporter
{
    public function __construct(
        private readonly SpecificationMedia $media,
        private readonly SpecificationImportCollectionFactory $importCollectionFactory,
        private readonly SpecificationFileCollectionFactory $fileCollectionFactory,
        private readonly SpecificationImportFactory $importFactory,
        private readonly SpecificationFileFactory $fileFactory,
        private readonly SpecificationFileResource $fileResource
    ) {
    }

    public function import(SpecificationBrand $brand, string $archivePath): SpecificationImport
    {
        if (!class_exists(\ZipArchive::class)) {
            throw new LocalizedException(__('ZIP import requires the PHP ZipArchive extension.'));
        }

        $brandId = (int)$brand->getId();
        if ($brandId <= 0) {
            throw new LocalizedException(__('Please save the brand before importing specifications.'));
        }

        $zip = new \ZipArchive();
        $absoluteArchivePath = $this->media->getAbsolutePath($archivePath);
        if ($zip->open($absoluteArchivePath) !== true) {
            throw new LocalizedException(__('Unable to open the ZIP file.'));
        }

        $this->deleteExistingBrandData($brandId);

        $import = $this->importFactory->create();
        $import->setData([
            'brand_id' => $brandId,
            'archive_file' => $archivePath,
            'file_count' => 0,
            'status' => 1,
        ])->save();

        $brandName = (string)$brand->getData('brand_name');
        $normalizedBrandName = $this->normalizeName($brandName);
        $fileCount = 0;

        for ($index = 0; $index < $zip->numFiles; $index++) {
            $stat = $zip->statIndex($index);
            $entryName = (string)($stat['name'] ?? '');
            if ($this->shouldSkipEntry($entryName)) {
                continue;
            }

            $parts = array_values(array_filter(explode('/', trim($entryName, '/')), static fn (string $part): bool => $part !== ''));
            if (count($parts) < 3) {
                continue;
            }

            $fileName = array_pop($parts);
            $modelName = (string)array_pop($parts);
            $entryBrandName = (string)array_pop($parts);
            if ($this->normalizeName($entryBrandName) !== $normalizedBrandName) {
                continue;
            }

            $contents = $zip->getFromIndex($index);
            if ($contents === false) {
                continue;
            }

            $lowerFileName = strtolower($fileName);
            $relativePath = $this->media->writeSpecificationFile($brandId, $modelName, $lowerFileName, $contents);
            $file = $this->fileFactory->create();
            $file->setData([
                'import_id' => (int)$import->getId(),
                'brand_id' => $brandId,
                'brand_name' => $brandName,
                'brand_logo' => (string)$brand->getData('brand_logo'),
                'model_name' => $modelName,
                'file_name' => $lowerFileName,
                'file_path' => $relativePath,
                'product_name_key' => $this->buildProductNameKey($lowerFileName),
                'is_product_specific' => (int)$brand->getData('is_product_specific') === 1 ? 1 : 0,
                'file_size' => strlen($contents),
                'file_mtime' => !empty($stat['mtime']) ? date('Y-m-d H:i:s', (int)$stat['mtime']) : null,
            ]);
            $this->fileResource->save($file);
            $fileCount++;
        }

        $zip->close();

        $import->setData('file_count', $fileCount)->save();
        if ($fileCount === 0) {
            $import->delete();
            $this->media->deleteBrandParsedFiles($brandId);
            throw new LocalizedException(__('No specification files were found for brand "%1" in this ZIP file.', $brandName));
        }

        return $import;
    }

    public function buildProductNameKey(string $fileName): string
    {
        $withoutExtension = pathinfo(strtolower($fileName), PATHINFO_FILENAME);
        $key = preg_replace('/[^a-z0-9]+/', ' ', $withoutExtension) ?: '';
        $key = preg_replace('/\\s+/', ' ', $key) ?: '';

        return trim($key);
    }

    public function buildProductSearchTokens(string $productName): array
    {
        $normalized = $this->buildProductNameKey($productName);
        $tokens = [];
        if ($normalized !== '') {
            $tokens[$normalized] = $normalized;
            $parts = preg_split('/\\s+/', $normalized) ?: [];
            for ($length = count($parts); $length >= 1; $length--) {
                for ($start = 0; $start <= count($parts) - $length; $start++) {
                    $token = implode(' ', array_slice($parts, $start, $length));
                    if (strlen($token) >= 3) {
                        $tokens[$token] = $token;
                    }
                }
            }
        }

        return array_values($tokens);
    }

    private function deleteExistingBrandData(int $brandId): void
    {
        foreach ($this->importCollectionFactory->create()->addFieldToFilter('brand_id', $brandId) as $import) {
            $import->delete();
        }
        foreach ($this->fileCollectionFactory->create()->addFieldToFilter('brand_id', $brandId) as $file) {
            $file->delete();
        }
        $this->media->deleteBrandParsedFiles($brandId);
    }

    private function shouldSkipEntry(string $entryName): bool
    {
        $entryName = trim($entryName);
        if ($entryName === '' || str_ends_with($entryName, '/')) {
            return true;
        }

        $parts = explode('/', $entryName);
        $basename = end($parts);

        return str_contains($entryName, '__MACOSX/')
            || $basename === '.DS_Store'
            || str_starts_with((string)$basename, '._');
    }

    private function normalizeName(string $value): string
    {
        $value = strtolower(trim($value));
        $value = preg_replace('/[^a-z0-9]+/', '', $value) ?: '';

        return $value;
    }
}