<?php

// +----------------------------------------------------------------------
// | EasyAdmin
// +----------------------------------------------------------------------
// | PHP交流群: 763822524
// +----------------------------------------------------------------------
// | 开源协议  https://mit-license.org 
// +----------------------------------------------------------------------
// | github开源项目：https://github.com/zhongshaofa/EasyAdmin
// +----------------------------------------------------------------------

namespace app\common\service;

use app\common\model\ShopGoodsSpecRelationModel;
use utils\RedisCache;

/**
 * 商品规格关系服务 by wes
 * Class ShopGoodsSpecRelationService
 * @package app\common\service
 */
class ShopGoodsSpecRelationService
{
    protected static $instance = null;
    protected $model = null;

    public function __construct()
    {
        $this->model = new ShopGoodsSpecRelationModel();
    }

    /**
     * 静态化入口
     * @return static|null
     */
    public static function make()
    {
        if(!self::$instance){
            self::$instance = new static();
        }

        return self::$instance;
    }

    /**
     * 获取商品对应数据
     * @param $goodsId 商品ID
     * @param string $field 字段
     * @param $cache 是否缓存数据，默认是
     * @return array|mixed
     * @throws \think\db\exception\DataNotFoundException
     * @throws \think\db\exception\DbException
     * @throws \think\db\exception\ModelNotFoundException
     */
    public function getDataByGoods($goodsId, $field='', $cache=true)
    {
        $cacheKey = "caches:goodsSpec:relation_{$goodsId}".($field? '_'.md5($field):'');
        $list = RedisCache::get($cacheKey);
        if($list && $cache){
            return $list;
        }

        $where = ['goods_id'=> $goodsId];
        $field = $field? $field : 'spec_name,spec_value';
        $data = $this->model->where($where)->field($field)
            ->withAttr('spec_value', function ($value) {
                return json_decode($value, true);
            })->select();
        $data = $data? $data->toArray():[];
        if($data){
            RedisCache::set($cacheKey, $data, rand(5,10));
        }

        return $data;
    }


}