<?php

namespace App\Services\Asteria;

use Illuminate\Database\Query\Builder;
use Illuminate\Database\Query\Expression;
use Illuminate\Support\Collection;
use Illuminate\Support\Facades\DB;

/**
 * Reads Magento 1 catalog products, EAV attributes, images, stock, categories,
 * and custom options from the Asteria connection (SELECT only).
 *
 * Output rows match the shape previously produced by Asteria's
 * shell/migrate_to_bagisto.php export, so Bagisto can persist them as
 * flexible_variant products.
 */
class Magento1ProductReader
{
    private Magento1Schema $schema;

    /** @var array<string, mixed> */
    private array $config;

    /** @var array<string, object>|null */
    private ?array $productAttributeMap = null;

    /** @var array<int, array<int, string>> */
    private array $optionLabelCache = [];

    /** @var array<int, string>|null */
    private ?array $variantOptionTitles = null;

    public function __construct(private string $connection = 'asteria', ?array $config = null)
    {
        $this->schema = new Magento1Schema($connection);
        $this->config = array_merge(self::defaultConfig(), $config ?? (array) config('asteria.products', []));
    }

    /**
     * @return array<string, mixed>
     */
    public static function defaultConfig(): array
    {
        return [
            'media_base_url'         => 'https://img.asteriahair.com/media/catalog/product',
            'store_media_url'        => 'https://img.asteriahair.com/media/',
            'channel'                => '',
            'channels'               => [],
            'locale'                 => 'en',
            'locales'                => [],
            'attribute_family'       => 'wigs',
            'base_attributes'        => [
                'name', 'short_description', 'description',
                'price', 'special_price', 'cost', 'weight',
                'meta_title', 'meta_keyword', 'meta_description',
                'url_key', 'status',
            ],
            'include_eav_attributes' => [
                'feature', 'gmc_color', 'gmc_product_type',
                'hair_closure', 'hair_colorr', 'hair_density',
                'hair_wavy', 'human_hair_type',
                'lace_color', 'lace_sizes',
                'sale_num', 'texturee',
                'video', 'alone',
            ],
            'variant_option_titles'  => [],
            'skip_option_titles'     => [
                'Lace', 'Wig Type', 'Shipping Option', 'Construction', 'Free Gift',
                'Headband Color', 'Color', 'Customized Product', 'X-Mas Gift Random?',
                'Custom Item', 'Hair Type', 'Layering Option', '4C Hairline', 'Customize Item',
                'Free Headband', 'Hair Parting Styles', 'Limited Design',
                'Mannequin Head', 'Texture', 'Time', 'Trim the Ends (Optional)', 'U Part Open Size',
                'Wig Color', 'Wig Style',
            ],
            'max_variants_warn'      => 500,
            // Magento status attribute value for "Enabled". Used when only_enabled=true.
            'enabled_status'         => 1,
            // false = also import disabled Magento products (status mapped to 0) so
            // reviews / orders can still match by SKU. Stock is not an import filter;
            // Out of Stock (is_in_stock=0) still forces Bagisto status=0.
            'only_enabled'           => false,
        ];
    }

    /**
     * Attribute definitions for include_eav_attributes (Bagisto-shaped).
     *
     * @return Collection<int, array<string, mixed>>
     */
    public function fetchAttributeDefinitions(): Collection
    {
        $codes = array_values(array_filter(array_map(
            'strval',
            $this->config['include_eav_attributes'] ?? []
        )));

        if ($codes === [] || ! $this->schema->hasTable('eav_attribute')) {
            return collect();
        }

        $query = DB::connection($this->connection)
            ->table('eav_attribute as ea')
            ->select($this->attributeSelectColumns())
            ->whereIn('ea.attribute_code', $codes);

        $typeId = $this->entityTypeId('catalog_product');

        if ($typeId) {
            $query->where('ea.entity_type_id', $typeId);
        }

        if ($this->schema->hasTable('catalog_eav_attribute')) {
            $query->leftJoin('catalog_eav_attribute as cea', 'cea.attribute_id', '=', 'ea.attribute_id');
        }

        $rows = $query->orderBy('ea.attribute_code')->get();

        if ($rows->isEmpty()) {
            return collect();
        }

        $optionsByAttr = $this->loadAttributeOptions(
            $rows->pluck('attribute_id')->map(fn ($id) => (int) $id)->all()
        );

        return $rows->map(function ($row) use ($optionsByAttr) {
            $attributeId = (int) $row->attribute_id;

            return [
                'code'            => (string) $row->attribute_code,
                'name'            => (string) ($row->frontend_label ?: $row->attribute_code),
                'type'            => $this->magentoInputToBagistoType((string) ($row->frontend_input ?? 'text')),
                'magento_input'   => (string) ($row->frontend_input ?? ''),
                'is_required'     => (bool) (int) ($row->is_required ?? 0),
                'is_unique'       => false,
                'is_filterable'   => (bool) (int) ($row->is_filterable ?? 0),
                'is_searchable'   => (bool) (int) ($row->is_searchable ?? 0),
                'is_comparable'   => (bool) (int) ($row->is_comparable ?? 0),
                'is_configurable' => (bool) (int) ($row->is_configurable ?? 0),
                'position'        => (int) ($row->position ?? 0),
                'options'         => $optionsByAttr[$attributeId] ?? [],
            ];
        })->values();
    }

    /**
     * Enabled Magento products after $afterEntityId, hydrated for Bagisto persist.
     *
     * @return Collection<int, array<string, mixed>>
     */
    public function fetchProducts(int $afterEntityId, int $limit, ?string $sku = null): Collection
    {
        if (! $this->schema->hasTable('catalog_product_entity')) {
            return collect();
        }

        $staticColumns = $this->schema->existingColumns('catalog_product_entity', [
            'entity_id',
            'sku',
            'type_id',
            'attribute_set_id',
            'created_at',
            'updated_at',
        ]);

        if ($staticColumns === [] || ! in_array('entity_id', $staticColumns, true)) {
            return collect();
        }

        $query = DB::connection($this->connection)
            ->table('catalog_product_entity as pe')
            ->select(array_map(fn (string $column) => 'pe.'.$column, $staticColumns))
            ->where('pe.entity_id', '>', $afterEntityId)
            ->orderBy('pe.entity_id')
            ->limit($limit);

        if (is_string($sku) && $sku !== '') {
            $query->where('pe.sku', $sku);
        }

        if ($this->onlyEnabled()) {
            $this->applyEnabledStatusFilter($query);
        }

        $rows = $query->get();

        if ($rows->isEmpty()) {
            return collect();
        }

        $entityIds = $rows->pluck('entity_id')->map(fn ($id) => (int) $id)->all();
        $eav = $this->loadEavValues($entityIds);
        $images = $this->loadImages($entityIds);
        $categories = $this->loadCategories($entityIds);
        $stock = $this->loadStock($entityIds);
        $customOptions = $this->loadCustomOptions($entityIds);
        $variantTitles = array_flip($this->variantOptionTitles());

        return $rows->map(function ($row) use ($eav, $images, $categories, $stock, $customOptions, $variantTitles) {
            $id = (int) $row->entity_id;

            return $this->assembleProduct(
                (array) $row,
                $eav[$id] ?? [],
                $images[$id] ?? ['base' => '', 'additional' => []],
                $categories[$id] ?? [],
                $stock[$id] ?? ['qty' => 0, 'is_in_stock' => null],
                $customOptions[$id] ?? [],
                $variantTitles
            );
        })->values();
    }

    private function onlyEnabled(): bool
    {
        return (bool) ($this->config['only_enabled'] ?? false);
    }

    /**
     * @param  Builder  $query
     */
    private function applyEnabledStatusFilter($query): void
    {
        $status = $this->productAttributes()['status'] ?? null;

        if (! $status || ! $this->schema->hasTable('catalog_product_entity_int')) {
            return;
        }

        $query->join('catalog_product_entity_int as st', function ($join) use ($status) {
            $join->on('st.entity_id', '=', 'pe.entity_id')
                ->where('st.attribute_id', (int) $status->attribute_id)
                ->where('st.value', (int) ($this->config['enabled_status'] ?? 1));

            if (in_array('store_id', $this->schema->columnListing('catalog_product_entity_int'), true)) {
                $join->where('st.store_id', 0);
            }
        });
    }

    /**
     * @param  array<string, mixed>  $entity
     * @param  array<string, mixed>  $eav
     * @param  array{base: string, additional: array<int, string>}  $images
     * @param  array<int, string>  $categories
     * @param  array{qty: mixed, is_in_stock: mixed}  $stock
     * @param  array<string, array<string, mixed>>  $customOptions
     * @param  array<string, int>  $variantTitles
     * @return array<string, mixed>
     */
    private function assembleProduct(
        array $entity,
        array $eav,
        array $images,
        array $categories,
        array $stock,
        array $customOptions,
        array $variantTitles
    ): array {
        $sku = trim((string) ($entity['sku'] ?? ''));
        $name = (string) ($eav['name'] ?? $sku);
        $urlKey = trim((string) ($eav['url_key'] ?? ''));

        if ($urlKey === '') {
            $urlKey = $this->generateUrlKey($name, $sku);
        }

        $variantOptions = [];

        foreach ($customOptions as $title => $option) {
            if (! isset($variantTitles[$title])) {
                continue;
            }

            if (! in_array($option['type'], ['drop_down', 'radio', 'checkbox', 'multiple'], true)) {
                continue;
            }

            $variantOptions[$title] = $option;
        }

        $basePrice = (float) ($eav['price'] ?? 0);
        $superAttributes = [];

        foreach (array_keys($variantOptions) as $title) {
            $superAttributes[] = $this->sanitizeAttributeCode($title);
        }

        $options = [];

        foreach ($variantOptions as $title => $option) {
            $options[] = $this->optionPayload($title, $option);
        }

        $combinations = $variantOptions === [] ? [] : $this->cartesianProduct($variantOptions);
        $variants = $this->buildVariants($sku, $stock, $variantOptions, $basePrice, $combinations);

        $row = [
            'entity_id'             => (int) $entity['entity_id'],
            'sku'                   => $sku,
            'type_id'               => (string) ($entity['type_id'] ?? 'simple'),
            'type'                  => 'flexible_variant',
            'name'                  => $name,
            'url_key'               => $urlKey,
            'short_description'     => $this->htmlToText((string) ($eav['short_description'] ?? '')),
            'description'           => $this->replaceMediaDirectives((string) ($eav['description'] ?? '')),
            'price'                 => $eav['price'] ?? '',
            'special_price'         => $eav['special_price'] ?? '',
            'cost'                  => $eav['cost'] ?? '',
            'weight'                => $eav['weight'] ?? '',
            // Magento: 1=Enabled, 2=Disabled. Out of Stock forces Bagisto status=0.
            'status'                => $this->resolveBagistoStatus($eav['status'] ?? 1, $stock),
            'featured'              => 0,
            'new'                   => 0,
            'guest_checkout'        => 1,
            'visible_individually'  => 1,
            'manage_stock'          => 1,
            'qty'                   => $stock['qty'] ?? 0,
            'in_stock'              => $stock['is_in_stock'] ?? 0,
            'base_image'            => $images['base'] ?? '',
            'additional_images'     => implode('|', $images['additional'] ?? []),
            'categories'            => $categories,
            'super_attributes'      => implode(',', $superAttributes),
            'options'               => $options,
            'variants'              => $variants,
            'meta_title'            => $eav['meta_title'] ?? '',
            'meta_keywords'         => $eav['meta_keyword'] ?? '',
            'meta_description'      => $eav['meta_description'] ?? '',
            'created_at'            => $entity['created_at'] ?? null,
        ];

        foreach ($this->config['include_eav_attributes'] ?? [] as $code) {
            if (array_key_exists($code, $row)) {
                continue;
            }

            $row[$code] = $eav[$code] ?? '';
        }

        return $row;
    }

    /**
     * Bagisto status is 0 when Magento stock availability is Out of Stock.
     * A missing stock row keeps the Magento enabled/disabled mapping.
     *
     * @param  array{qty?: mixed, is_in_stock?: mixed}  $stock
     */
    private function resolveBagistoStatus(mixed $magentoStatus, array $stock): int
    {
        if ($this->isExplicitlyOutOfStock($stock)) {
            return 0;
        }

        return $this->mapMagentoStatus($magentoStatus);
    }

    /**
     * Magento cataloginventory_stock_item.is_in_stock: 1 = In Stock, 0 = Out of Stock.
     *
     * @param  array{qty?: mixed, is_in_stock?: mixed}  $stock
     */
    private function isExplicitlyOutOfStock(array $stock): bool
    {
        if (! array_key_exists('is_in_stock', $stock) || $stock['is_in_stock'] === null || $stock['is_in_stock'] === '') {
            return false;
        }

        return (int) $stock['is_in_stock'] !== 1;
    }

    /**
     * Magento 1 product status: 1=Enabled, 2=Disabled. Bagisto uses 1/0.
     */
    private function mapMagentoStatus(mixed $value): int
    {
        $enabled = (int) ($this->config['enabled_status'] ?? 1);

        if (is_numeric($value)) {
            return (int) $value === $enabled ? 1 : 0;
        }

        $normalized = strtolower(trim((string) $value));

        if (in_array($normalized, ['1', 'enabled', 'enable', 'yes', 'true'], true)) {
            return 1;
        }

        return 0;
    }

    /**
     * @param  array<int, int>  $entityIds
     * @return array<int, array<string, mixed>>
     */
    private function loadEavValues(array $entityIds): array
    {
        $attributes = $this->productAttributes();

        if ($entityIds === [] || $attributes === []) {
            return [];
        }

        $byType = [];

        foreach ($attributes as $code => $attribute) {
            $type = $attribute->backend_type ?? 'varchar';

            if ($type === 'static' || $type === '') {
                continue;
            }

            $byType[$type][(int) $attribute->attribute_id] = $code;
        }

        $values = [];

        foreach ($byType as $type => $idToCode) {
            $table = 'catalog_product_entity_'.$type;

            if (! $this->schema->hasTable($table)) {
                continue;
            }

            $columns = ['entity_id', 'attribute_id', 'value'];

            if (in_array('store_id', $this->schema->columnListing($table), true)) {
                $columns[] = 'store_id';
            }

            $rows = DB::connection($this->connection)
                ->table($table)
                ->select($columns)
                ->whereIn('entity_id', $entityIds)
                ->whereIn('attribute_id', array_keys($idToCode))
                ->get();

            foreach ($rows as $row) {
                $code = $idToCode[(int) $row->attribute_id] ?? null;

                if ($code === null || $row->value === null || $row->value === '') {
                    continue;
                }

                $entityId = (int) $row->entity_id;
                $storeId = (int) ($row->store_id ?? 0);

                if (! isset($values[$entityId][$code]) || $storeId === 0) {
                    $values[$entityId][$code] = $row->value;
                }
            }
        }

        foreach ($attributes as $code => $info) {
            $input = (string) ($info->frontend_input ?? '');

            // Magento status is a select (1=Enabled, 2=Disabled). Keep the numeric
            // value so mapMagentoStatus can map it; converting to "Enabled" makes (int) 0.
            if ($code === 'status' || ! in_array($input, ['select', 'multiselect'], true)) {
                continue;
            }

            foreach ($values as $entityId => $row) {
                if (! isset($row[$code])) {
                    continue;
                }

                $optionIds = array_filter(explode(',', (string) $row[$code]), 'is_numeric');
                $labels = $this->optionLabels((int) $info->attribute_id, $optionIds);
                $values[$entityId][$code] = implode(',', $labels);
            }
        }

        return $values;
    }

    /**
     * @param  array<int, int>  $entityIds
     * @return array<int, array{base: string, additional: array<int, string>}>
     */
    private function loadImages(array $entityIds): array
    {
        if ($entityIds === [] || ! $this->schema->hasTable('catalog_product_entity_media_gallery')) {
            return [];
        }

        $query = DB::connection($this->connection)
            ->table('catalog_product_entity_media_gallery as mg')
            ->select('mg.entity_id', 'mg.value');

        if ($this->schema->hasTable('catalog_product_entity_media_gallery_value')) {
            $query->leftJoin('catalog_product_entity_media_gallery_value as mgv', function ($join) {
                $join->on('mgv.value_id', '=', 'mg.value_id');

                if (in_array('store_id', $this->schema->columnListing('catalog_product_entity_media_gallery_value'), true)) {
                    $join->where('mgv.store_id', 0);
                }
            });

            $query->addSelect('mgv.position', 'mgv.disabled');
            $query->orderBy('mg.entity_id')->orderByRaw('COALESCE(mgv.position, 999) asc');
        } else {
            $query->orderBy('mg.entity_id');
        }

        $rows = $query->whereIn('mg.entity_id', $entityIds)->get();
        $baseUrl = rtrim((string) ($this->config['media_base_url'] ?? ''), '/');
        $grouped = [];

        foreach ($rows as $row) {
            if ((int) ($row->disabled ?? 0) === 1) {
                continue;
            }

            $path = (string) ($row->value ?? '');

            if ($path === '' || $path === 'no_selection') {
                continue;
            }

            $grouped[(int) $row->entity_id][] = $this->absoluteMediaUrl($baseUrl, $path);
        }

        $result = [];

        foreach ($grouped as $entityId => $urls) {
            $urls = array_values(array_unique($urls));
            $result[$entityId] = [
                'base'        => $urls[0] ?? '',
                'additional'  => array_slice($urls, 1),
            ];
        }

        return $result;
    }

    /**
     * @param  array<int, int>  $entityIds
     * @return array<int, array<int, string>>
     */
    private function loadCategories(array $entityIds): array
    {
        if (
            $entityIds === []
            || ! $this->schema->hasTable('catalog_category_product')
            || ! $this->schema->hasTable('catalog_category_entity')
            || ! $this->schema->hasTable('catalog_category_entity_varchar')
        ) {
            return [];
        }

        $nameAttr = $this->attributeByCode('catalog_category', 'name');

        if (! $nameAttr) {
            return [];
        }

        $query = DB::connection($this->connection)
            ->table('catalog_category_product as ccp')
            ->join('catalog_category_entity as cc', 'cc.entity_id', '=', 'ccp.category_id')
            ->join('catalog_category_entity_varchar as ccv', function ($join) use ($nameAttr) {
                $join->on('ccv.entity_id', '=', 'cc.entity_id')
                    ->where('ccv.attribute_id', (int) $nameAttr->attribute_id);

                if (in_array('store_id', $this->schema->columnListing('catalog_category_entity_varchar'), true)) {
                    $join->where('ccv.store_id', 0);
                }
            })
            ->whereIn('ccp.product_id', $entityIds)
            ->select('ccp.product_id', 'ccv.value as category_name', 'cc.path');

        if (in_array('path', $this->schema->columnListing('catalog_category_entity'), true)) {
            $query->orderByRaw('LENGTH(cc.path) desc');
        }

        $result = [];

        foreach ($query->get() as $row) {
            $name = trim((string) ($row->category_name ?? ''));

            if ($name === '') {
                continue;
            }

            $productId = (int) $row->product_id;

            if (! isset($result[$productId]) || ! in_array($name, $result[$productId], true)) {
                $result[$productId][] = $name;
            }
        }

        return $result;
    }

    /**
     * @param  array<int, int>  $entityIds
     * @return array<int, array{qty: mixed, is_in_stock: mixed}>
     */
    private function loadStock(array $entityIds): array
    {
        if ($entityIds === [] || ! $this->schema->hasTable('cataloginventory_stock_item')) {
            return [];
        }

        $columns = $this->schema->existingColumns('cataloginventory_stock_item', [
            'product_id',
            'qty',
            'is_in_stock',
            'stock_id',
        ]);

        if ($columns === [] || ! in_array('product_id', $columns, true)) {
            return [];
        }

        $query = DB::connection($this->connection)
            ->table('cataloginventory_stock_item')
            ->select($columns)
            ->whereIn('product_id', $entityIds);

        if (in_array('stock_id', $columns, true)) {
            $query->where('stock_id', 1);
        }

        $result = [];

        foreach ($query->get() as $row) {
            $result[(int) $row->product_id] = [
                'qty'         => $row->qty ?? 0,
                'is_in_stock' => $row->is_in_stock ?? 0,
            ];
        }

        return $result;
    }

    /**
     * @param  array<int, int>  $entityIds
     * @return array<int, array<string, array<string, mixed>>>
     */
    private function loadCustomOptions(array $entityIds): array
    {
        if (
            $entityIds === []
            || ! $this->schema->hasTable('catalog_product_option')
            || ! $this->schema->hasTable('catalog_product_option_title')
        ) {
            return [];
        }

        $query = DB::connection($this->connection)
            ->table('catalog_product_option as o')
            ->leftJoin('catalog_product_option_title as ot', function ($join) {
                $join->on('ot.option_id', '=', 'o.option_id');

                if (in_array('store_id', $this->schema->columnListing('catalog_product_option_title'), true)) {
                    $join->where('ot.store_id', 0);
                }
            })
            ->whereIn('o.product_id', $entityIds)
            ->select(
                'o.product_id',
                'o.option_id',
                'o.type',
                'o.sort_order as option_sort_order',
                'o.is_require',
                'ot.title as option_title'
            )
            ->orderBy('o.product_id')
            ->orderBy('o.sort_order');

        if ($this->schema->hasTable('catalog_product_option_type_value')) {
            $query->leftJoin('catalog_product_option_type_value as otv', 'otv.option_id', '=', 'o.option_id')
                ->addSelect('otv.option_type_id', 'otv.sku as value_sku', 'otv.sort_order as value_sort_order')
                ->orderBy('otv.sort_order');

            if ($this->schema->hasTable('catalog_product_option_type_price')) {
                $query->leftJoin('catalog_product_option_type_price as otp', function ($join) {
                    $join->on('otp.option_type_id', '=', 'otv.option_type_id');

                    if (in_array('store_id', $this->schema->columnListing('catalog_product_option_type_price'), true)) {
                        $join->where('otp.store_id', 0);
                    }
                })->addSelect('otp.price', 'otp.price_type');
            }

            if ($this->schema->hasTable('catalog_product_option_type_title')) {
                $query->leftJoin('catalog_product_option_type_title as ott', function ($join) {
                    $join->on('ott.option_type_id', '=', 'otv.option_type_id');

                    if (in_array('store_id', $this->schema->columnListing('catalog_product_option_type_title'), true)) {
                        $join->where('ott.store_id', 0);
                    }
                })->addSelect('ott.title as value_title');
            }
        }

        $options = [];

        foreach ($query->get() as $row) {
            $title = (string) ($row->option_title ?? '');

            if ($title === '') {
                continue;
            }

            $productId = (int) $row->product_id;

            if (! isset($options[$productId][$title])) {
                $options[$productId][$title] = [
                    'option_id'  => (int) $row->option_id,
                    'type'       => (string) ($row->type ?? ''),
                    'is_require' => (int) ($row->is_require ?? 0),
                    'sort_order' => (int) ($row->option_sort_order ?? 0),
                    'values'     => [],
                ];
            }

            if (! empty($row->option_type_id)) {
                $sort = (int) ($row->value_sort_order ?? 0);
                $options[$productId][$title]['values'][$sort] = [
                    'id'         => (int) $row->option_type_id,
                    'title'      => (string) ($row->value_title ?? ''),
                    'sku'        => (string) ($row->value_sku ?? ''),
                    'price'      => (float) ($row->price ?? 0),
                    'price_type' => (string) ($row->price_type ?? 'fixed'),
                    'sort_order' => $sort,
                ];
            }
        }

        foreach ($options as &$productOptions) {
            foreach ($productOptions as &$option) {
                ksort($option['values']);
            }
        }
        unset($productOptions, $option);

        return $options;
    }

    /**
     * @return array<int, string>
     */
    private function variantOptionTitles(): array
    {
        if ($this->variantOptionTitles !== null) {
            return $this->variantOptionTitles;
        }

        if (! empty($this->config['variant_option_titles'])) {
            return $this->variantOptionTitles = array_values(array_map(
                'strval',
                $this->config['variant_option_titles']
            ));
        }

        $skip = array_flip(array_map('strval', $this->config['skip_option_titles'] ?? []));

        if (
            ! $this->schema->hasTable('catalog_product_option')
            || ! $this->schema->hasTable('catalog_product_option_title')
        ) {
            return $this->variantOptionTitles = [];
        }

        $query = DB::connection($this->connection)
            ->table('catalog_product_option as o')
            ->join('catalog_product_option_title as ot', function ($join) {
                $join->on('ot.option_id', '=', 'o.option_id');

                if (in_array('store_id', $this->schema->columnListing('catalog_product_option_title'), true)) {
                    $join->where('ot.store_id', 0);
                }
            })
            ->whereIn('o.type', ['drop_down', 'radio'])
            ->distinct()
            ->orderBy('ot.title')
            ->select('ot.title');

        $titles = [];

        foreach ($query->pluck('title') as $title) {
            $title = (string) $title;

            if ($title === '' || isset($skip[$title])) {
                continue;
            }

            $titles[] = $title;
        }

        return $this->variantOptionTitles = $titles;
    }

    /**
     * @param  array<string, array<string, mixed>>  $options
     * @return array<int, array<string, array<string, mixed>>>
     */
    private function cartesianProduct(array $options): array
    {
        $sets = [];
        $titles = [];

        foreach ($options as $title => $option) {
            if (empty($option['values'])) {
                continue;
            }

            $titles[] = $title;
            $sets[] = array_values($option['values']);
        }

        if ($sets === []) {
            return [];
        }

        $result = [[]];

        foreach ($sets as $idx => $valueList) {
            $title = $titles[$idx];
            $next = [];

            foreach ($result as $existing) {
                foreach ($valueList as $value) {
                    $next[] = array_merge($existing, [$title => $value]);
                }
            }

            $result = $next;
        }

        return $result;
    }

    /**
     * @param  array{qty: mixed, is_in_stock: mixed}  $stock
     * @param  array<string, array<string, mixed>>  $variantOptions
     * @param  array<int, array<string, array<string, mixed>>>  $combinations
     * @return array<int, array<string, mixed>>
     */
    private function buildVariants(
        string $parentSku,
        array $stock,
        array $variantOptions,
        float $basePrice,
        array $combinations
    ): array {
        if ($combinations === []) {
            return [];
        }

        $variants = [];

        foreach ($combinations as $combo) {
            $skuParts = [];
            $price = $basePrice;
            $variant = [
                'sku'      => '',
                'price'    => '',
                'qty'      => (float) ($stock['qty'] ?? 0),
                'in_stock' => (int) ($stock['is_in_stock'] ?? 0),
            ];

            foreach ($combo as $optTitle => $valueInfo) {
                $skuParts[] = $this->variantSkuPart($valueInfo);
                $price += (float) ($valueInfo['price'] ?? 0);
                $label = (string) ($valueInfo['title'] ?? '');
                $variant[$optTitle] = $label;
                $variant[$this->sanitizeAttributeCode($optTitle)] = $label;
            }

            $variant['sku'] = $parentSku.'-'.implode('-', $skuParts);
            $variant['price'] = number_format($price, 2, '.', '');
            $variants[] = $variant;
        }

        return $variants;
    }

    /**
     * Magento option-value SKU. Fall back to the value title, then sort order,
     * when that SKU is empty.
     *
     * @param  array<string, mixed>  $valueInfo
     */
    private function variantSkuPart(array $valueInfo): string
    {
        $part = trim((string) ($valueInfo['sku'] ?? ''));

        if ($part === '') {
            $part = trim((string) ($valueInfo['title'] ?? ''));
        }

        if ($part === '') {
            $part = (string) ($valueInfo['sort_order'] ?? '');
        }

        return $part;
    }

    /**
     * @param  array<string, mixed>  $option
     * @return array<string, mixed>
     */
    private function optionPayload(string $title, array $option): array
    {
        $values = [];

        foreach ($option['values'] as $value) {
            $values[] = [
                'title'      => $value['title'],
                'price'      => $value['price'],
                'price_type' => $value['price_type'],
                'sku'        => $value['sku'],
                'sort_order' => (int) $value['sort_order'],
            ];
        }

        return [
            'title'      => $title,
            'type'       => $option['type'],
            'is_require' => (bool) $option['is_require'],
            'sort_order' => (int) $option['sort_order'],
            'values'     => $values,
        ];
    }

    /**
     * @return array<string, object>
     */
    private function productAttributes(): array
    {
        if ($this->productAttributeMap !== null) {
            return $this->productAttributeMap;
        }

        $codes = array_values(array_unique(array_merge(
            $this->config['base_attributes'] ?? [],
            $this->config['include_eav_attributes'] ?? [],
            ['status', 'url_key']
        )));

        return $this->productAttributeMap = $this->attributeMap('catalog_product', $codes);
    }

    /**
     * @param  array<int, string>  $codes
     * @return array<string, object>
     */
    private function attributeMap(string $entityTypeCode, array $codes): array
    {
        if ($codes === [] || ! $this->schema->hasTable('eav_attribute')) {
            return [];
        }

        $select = $this->schema->existingColumns('eav_attribute', [
            'attribute_id',
            'attribute_code',
            'backend_type',
            'frontend_input',
            'frontend_label',
            'is_required',
        ]);

        if ($select === []) {
            return [];
        }

        $query = DB::connection($this->connection)
            ->table('eav_attribute')
            ->select($select)
            ->whereIn('attribute_code', $codes);

        $typeId = $this->entityTypeId($entityTypeCode);

        if ($typeId) {
            $query->where('entity_type_id', $typeId);
        }

        $map = [];

        foreach ($query->get() as $attribute) {
            $input = (string) ($attribute->frontend_input ?? '');

            if (in_array($input, ['media_image', 'gallery'], true)) {
                continue;
            }

            $map[$attribute->attribute_code] = $attribute;
        }

        return $map;
    }

    private function attributeByCode(string $entityTypeCode, string $code): ?object
    {
        return $this->attributeMap($entityTypeCode, [$code])[$code] ?? null;
    }

    private function entityTypeId(string $code): ?int
    {
        if (! $this->schema->hasTable('eav_entity_type')) {
            return null;
        }

        $id = DB::connection($this->connection)
            ->table('eav_entity_type')
            ->where('entity_type_code', $code)
            ->value('entity_type_id');

        return $id ? (int) $id : null;
    }

    /**
     * @return array<int, string|Expression>
     */
    private function attributeSelectColumns(): array
    {
        $columns = [
            'ea.attribute_id',
            'ea.attribute_code',
            'ea.backend_type',
        ];

        $listing = array_fill_keys(array_map('strtolower', $this->schema->columnListing('eav_attribute')), true);

        foreach (['frontend_label', 'frontend_input', 'is_required', 'is_user_defined'] as $column) {
            if (isset($listing[$column])) {
                $columns[] = 'ea.'.$column;
            }
        }

        if ($this->schema->hasTable('catalog_eav_attribute')) {
            $cea = array_fill_keys(array_map('strtolower', $this->schema->columnListing('catalog_eav_attribute')), true);

            foreach (['is_searchable', 'is_filterable', 'is_comparable', 'is_configurable', 'position'] as $column) {
                if (isset($cea[$column])) {
                    $columns[] = DB::raw('IFNULL(cea.'.$column.', 0) as '.$column);
                }
            }
        }

        return $columns;
    }

    /**
     * @param  array<int, int>  $attributeIds
     * @return array<int, array<int, array<string, mixed>>>
     */
    private function loadAttributeOptions(array $attributeIds): array
    {
        if (
            $attributeIds === []
            || ! $this->schema->hasTable('eav_attribute_option')
            || ! $this->schema->hasTable('eav_attribute_option_value')
        ) {
            return [];
        }

        $rows = DB::connection($this->connection)
            ->table('eav_attribute_option as eao')
            ->leftJoin('eav_attribute_option_value as eaov', function ($join) {
                $join->on('eaov.option_id', '=', 'eao.option_id');

                if (in_array('store_id', $this->schema->columnListing('eav_attribute_option_value'), true)) {
                    $join->where('eaov.store_id', 0);
                }
            })
            ->whereIn('eao.attribute_id', $attributeIds)
            ->orderBy('eao.attribute_id')
            ->orderBy('eao.sort_order')
            ->get(['eao.attribute_id', 'eao.option_id', 'eao.sort_order', 'eaov.value as label']);

        $grouped = [];

        foreach ($rows as $row) {
            $grouped[(int) $row->attribute_id][] = [
                'id'         => (int) $row->option_id,
                'label'      => (string) ($row->label ?? ''),
                'sort_order' => (int) ($row->sort_order ?? 0),
            ];
        }

        return $grouped;
    }

    /**
     * @param  array<int, string>  $optionIds
     * @return array<int, string>
     */
    private function optionLabels(int $attributeId, array $optionIds): array
    {
        $this->warmOptionLabels($attributeId);

        $labels = [];

        foreach ($optionIds as $optionId) {
            $id = (int) $optionId;

            if (isset($this->optionLabelCache[$attributeId][$id])) {
                $labels[] = $this->optionLabelCache[$attributeId][$id];
            }
        }

        return $labels;
    }

    private function warmOptionLabels(int $attributeId): void
    {
        if (isset($this->optionLabelCache[$attributeId])) {
            return;
        }

        $this->optionLabelCache[$attributeId] = [];

        foreach ($this->loadAttributeOptions([$attributeId])[$attributeId] ?? [] as $option) {
            $this->optionLabelCache[$attributeId][(int) $option['id']] = (string) $option['label'];
        }
    }

    private function magentoInputToBagistoType(string $frontendInput): string
    {
        return match ($frontendInput) {
            'textarea'               => 'textarea',
            'select'                 => 'select',
            'multiselect'            => 'multiselect',
            'boolean'                => 'boolean',
            'price'                  => 'price',
            'date'                   => 'date',
            'media_image', 'gallery' => 'image',
            default                  => 'text',
        };
    }

    public function sanitizeAttributeCode(string $title): string
    {
        $code = strtolower($title);
        $code = (string) preg_replace('/[^a-z0-9]+/', '_', $code);

        return trim($code, '_');
    }

    private function generateUrlKey(string $name, string $sku): string
    {
        $key = strtolower($name);
        $key = (string) preg_replace('/[^a-z0-9\s-]/', '', $key);
        $key = (string) preg_replace('/[\s]+/', '-', trim($key));
        $key = (string) preg_replace('/-+/', '-', $key);
        $key = trim($key, '-');

        if ($key === '') {
            $key = strtolower((string) preg_replace('/[^a-zA-Z0-9]/', '-', $sku));
        }

        return $key;
    }

    private function htmlToText(string $html): string
    {
        if ($html === '') {
            return '';
        }

        $text = html_entity_decode(strip_tags($html), ENT_QUOTES | ENT_HTML5, 'UTF-8');

        return trim((string) preg_replace('/\s+/', ' ', $text));
    }

    private function replaceMediaDirectives(string $html): string
    {
        $mediaBaseUrl = (string) ($this->config['store_media_url'] ?? '');

        if ($html === '' || $mediaBaseUrl === '') {
            return $html;
        }

        $mediaBaseUrl = rtrim($mediaBaseUrl, '/').'/';

        return (string) preg_replace_callback(
            '/\{\{\s*media\s+url\s*=\s*["\']([^"\']+)["\']\s*\}\}/i',
            fn (array $match) => $mediaBaseUrl.ltrim($match[1], '/'),
            $html
        );
    }

    private function absoluteMediaUrl(string $baseUrl, string $path): string
    {
        if (str_starts_with($path, 'http://') || str_starts_with($path, 'https://')) {
            return $path;
        }

        if ($baseUrl === '') {
            return $path;
        }

        return $baseUrl.'/'.ltrim($path, '/');
    }
}