<?php

namespace app\common\Service;

use app\common\model\SkuSpec as SkuSpecModel;
use think\Db;

class SkuSpec
{
    /**
     * 获取指定商品的SKU信息
     * @param int $goods_id 商品ID
     * @return array
     */
    public static function getGoodsSkuSpec($goods_id,$nType = 1)
    {
        $list = (new SkuSpecModel())
             ->field('MIN(`id`) AS `id`, MIN(`goods_id`) AS `goods_id`, `spec_id`')
             ->where('type', $nType)
             ->where('goods_id', $goods_id)            
             ->with([
                'Spec',
                'SkuValue' => function ($query) use ($goods_id) {
                    $query->where('goods_id', $goods_id)
                    ->field('id,goods_id,spec_id,spec_value_id')
                    ->with(['SpecValue']);
                }
            ])->group('spec_id')->select();

        $list = collection($list)->toArray();
        return $list;
    }

    /**
     * 批量获取SKU规格属性字符串
     * @param array $sku_ids SKU ID数组
     * @return array 返回 [sku_id => 'spec_name:spec_value,spec_name:spec_value'] 格式
     */
    public static function getSkuAttrs($sku_ids)
    {
        if (empty($sku_ids)) {
            return [];
        }

        // 通过shop_goods_sku表的spec_value_ids字段来查询规格信息
        $list = Db::name('shop_goods_sku')
            ->alias('sku')
            ->field('sku.id, GROUP_CONCAT(sp.name,":",sv.value ORDER BY sp.id asc) as sku_attr')
            ->join('shop_goods_sku_spec gss', "FIND_IN_SET(gss.id, sku.spec_value_ids)", 'LEFT')
            ->join('shop_spec sp', 'sp.id = gss.spec_id', 'LEFT')
            ->join('shop_spec_value sv', 'sv.id = gss.spec_value_id', 'LEFT')
            ->where('sku.id', 'in', $sku_ids)
            ->group('sku.id')
            ->select();

        $result = [];
        foreach ($list as $item) {
            $result[$item['id']] = $item['sku_attr'] ?: '';
        }

        return $result;
    }
}