<?php

namespace App\Services;

use Modules\SystemTool\Models\SysFileModel;

/**
 * 商品快照首图解析：从明细 image_ids 批量解析文件 URL（门店订单列表/详情、采购单元格下钻共用）
 */
class ItemImageResolver
{
    /**
     * @param array<int, array<string, mixed>> $items 明细数组（引用修改：写入 image，移除 image_ids）
     */
    public function resolve(array &$items): void
    {
        $fileIds = [];
        foreach ($items as $line) {
            foreach ((array) ($line['image_ids'] ?? []) as $fileId) {
                if ($fileId !== '' && $fileId !== null) {
                    $fileIds[] = (int) $fileId;
                }
            }
        }
        $fileUrls = [];
        if ($fileIds !== []) {
            foreach (SysFileModel::query()->whereIn('id', array_unique($fileIds))->get() as $file) {
                $fileUrls[$file->id] = $file->preview_url;
            }
        }
        foreach ($items as &$product) {
            $product['image'] = '';
            foreach ((array) ($product['image_ids'] ?? []) as $fileId) {
                if ($fileId !== '' && $fileId !== null && isset($fileUrls[(int) $fileId])) {
                    $product['image'] = $fileUrls[(int) $fileId];
                    break;
                }
            }
            unset($product['image_ids']);
        }
    }
}