<?php

namespace app\common\service;

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

/**
 * 订单商品服务 by wes
 * Class ShopOrderGoodsService
 * @package app\common\service
 */
class ShopOrderGoodsService
{
    protected static $instance = null;
    protected $model = null;

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

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

        return self::$instance;
    }

    /**
     * 用户购买过该商品的数量统计
     * @param $uid 用户ID
     * @param int $goodsId 商品ID，0表示用户购买的所有商品数量统计
     * @return array|mixed
     */
    public function getCountByUserAndGoods($uid, $goodsSn='0')
    {
        $cacheKey = "caches:orders:goodsCount:{$uid}_{$goodsSn}";
        $data = RedisCache::get($cacheKey);
        if($data){
            return $data;
        }

        $where = ['og.uid'=>$uid];
        if($goodsSn){
            $where['g.goods_sn'] = $goodsSn;
        }
        $data = $this->model->alias('og')
                ->leftJoin('shop_order o', 'o.order_id = og.order_id')
                ->leftJoin('shop_goods g', 'og.goods_id = g.goods_id')
                ->where('o.status', 'in', [1, 2, 4])
                ->where($where)
                ->count('og.og_id');
        if($data){
            RedisCache::set($cacheKey, $data, rand(3,5));
        }

        return $data;
    }
}