<?php

namespace app\common\service;
use app\common\model\ShopGoodsSpec;
use utils\RedisCache;

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

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

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

        return self::$instance;
    }

    /**
     * 获取规格列表数据
     * @param $goodsId 商品ID
     * @param string $field 返回字段
     * @param string $cache 是否缓存
     * @return array|mixed
     * @throws \think\db\exception\DataNotFoundException
     * @throws \think\db\exception\DbException
     * @throws \think\db\exception\ModelNotFoundException
     */
    public function getListByGoods($goodsId, $field='', $cache=false)
    {
        if($goodsId<=0){
            return false;
        }

        $cacheKey = "caches:goodsSpec:list_{$goodsId}".($field? '_'.md5($field):'');
        $data = RedisCache::get($cacheKey);
        if($data && $cache){
            return $data;
        }

        $where = ['goods_id'=> $goodsId];
        $field = $field? $field : 'spec_ids,spec_text,original_price,price,picture,stock';
        $data = $this->model->where($where)->field($field)->select();
        $data = $data? $data->toArray():[];
        if($data && $cache){
            RedisCache::set($cacheKey, $data, rand(3, 5));
        }

        return $data;
    }

    /**
     * 获取商品规格库存
     * @param $goodsSn 商品编号
     * @param $specIds
     * @return array|mixed
     */
    public function getStock($goodsSn, $specIds)
    {
        $cacheKey = "caches:goodsSpec:stock:{$goodsSn}_".md5($specIds);
        $data = RedisCache::get($cacheKey);
        if($data){
            return $data;
        }

        $data = $this->model->where(['goods_sn'=> $goodsSn,'spec_ids'=> $specIds])->value('stock');
        if($data){
            RedisCache::set($cacheKey, $data, rand(3,5));
        }

        return $data;
    }

    /**
     * 获取商品规格数据
     * @param $goodsId
     * @param $specIds
     * @param string $field
     * @param bool $cache
     * @return array|false|mixed
     * @throws \think\db\exception\DataNotFoundException
     * @throws \think\db\exception\DbException
     * @throws \think\db\exception\ModelNotFoundException
     */
    public function getDataByGoods($goodsId, $specIds, $field='', $cache=true)
    {
        if($goodsId<=0){
            return false;
        }

        $cacheKey = "caches:goodsSpec:list_{$goodsId}".($specIds? '_'.md5(json_encode($specIds, 256)):'');
        $data = RedisCache::get($cacheKey);
        if($data && $cache){
            return $data;
        }

        $where = ['goods_id'=> $goodsId];
        $field = $field? $field : 'goods_spec_id,spec_ids,spec_text,original_price,price,rebate_score,weight,picture,stock';
        $data = $this->model->where($where)->field($field)->find();
        $data = $data? $data->toArray():[];
        if($data && $cache){
            RedisCache::set($cacheKey, $data, rand(3, 5));
        }

        return $data;
    }
}