<?php

namespace addons\Seckill\common\logic;

use common\enums\AddonsEnum;
use common\enums\RedisKeyEnum;
use common\traits\ErrorTrait;
use Yii;
use Exception;
use addons\Seckill\common\models\SeckillActivity;

class ActivityLogic
{

    private static function getStockKey($activity_id)
    {
        $key = RedisKeyEnum::suffix(RedisKeyEnum::SECKILL_ACTIVITY_STOCK, $activity_id, true);
        return $key;
    }

    public static function getNowStock($activity_id)
    {
        $key = self::getStockKey($activity_id);
        $redis = Yii::$app->redis;
        $stock = $redis->get($key);

        return $stock;
    }

    /**
     * 设置活动缓存[当缓存不存在时有效]
     * @param $activity_id
     * @param $activity_stock
     * @return
     */
    public static function setStock($activity_id,$activity_stock,$force=false)
    {
        $key = self::getStockKey($activity_id);
        $redis = Yii::$app->redis;
        if($force){
            $res = $redis->set($key,$activity_stock);
        }else{
            $res = $redis->setnx($key,$activity_stock);
        }
        return $res;
    }

    /**
     * 库存减1操作
     * @param $activity_id
     * @return bool
     */
    public static function decrStock($activity_id)
    {
        $key = self::getStockKey($activity_id);
        $redis = Yii::$app->redis;
        $result = $redis->decr($key);
        if($result >= 0){
            return true;
        }
        return false;
    }

    /**
     * 库存减1操作
     * @param $activity_id
     * @return bool
     */
    public static function incrStock($activity_id)
    {
        $key = self::getStockKey($activity_id);
        $redis = Yii::$app->redis;
        $result = $redis->incr($key);
        if($result >= 0){
            return true;
        }
        return false;
    }

}