<?php

namespace utils;

use think\facade\Cache;

/**
 * Redis 缓存封装 by wes
 * Class RedisCache
 * @package utils
 */
class RedisCache
{
    public static function get($key)
    {
        $redis = Cache::store('redis')->handler();
        $data = $redis->get($key);
        $jsonData = $data? json_decode($data, true) : [];
        return $jsonData? $jsonData : $data;
    }

    /**
     * 设置缓存
     * @param $key 键名
     * @param $data 数据：数组和字符串，数组自动转化JSON
     * @param int $expire 有效期：0为永久
     * @return mixed
     */
    public static function set($key, $data, $expire =null)
    {
        $expire = $expire !=null ? $expire : config('cache.stores.redis.expire', 24 * 3600);
        $data = is_array($data) && !empty($data)? json_encode($data, 256) : $data;
        $data = !empty($data)? $data : null;
        $redis = Cache::store('redis')->handler();
        if ($expire > 0) {
            return $redis->setex($key, $expire, $data);
        } else {
            return $redis->set($key, $data);
        }
    }

    /**
     * 键名是否存在
     * @param $key
     * @param $expire
     * @return mixed
     */
    public static function exists($key){
        $redis = Cache::store('redis')->handler();
        return $redis->exists($key);
    }

    /**
     * 递增
     * @param $key
     * @return bool
     */
    public static function incr($key, $step=1){
        $redis = Cache::store('redis')->handler();
        return $redis->incrby($key, $step);
    }

    /**
     * 递减
     * @param $key
     * @return bool
     */
    public static function decr($key, $step=1){
        $redis = Cache::store('redis')->handler();
        return $redis->decrby($key, $step);
    }

    /**
     * 进队列缓存
     * @param $key 键名
     * @param $data 队列数据
     * @param bool $clear 是否清除之前数据
     * @return mixed
     */
    public static function rPush($key, $data, $clear = false)
    {
        $redis = Cache::store('redis')->handler();
        if ($clear) {
            $redis->del($key);
        }
        $data = is_array($data) ? json_encode($data, 256) : $data;
        return $redis->rpush($key, $data);

    }

    /**
     * 出队列
     * @param $key 键名
     * @return array|mixed
     */
    public static function lPop($key)
    {
        $redis = Cache::store('redis')->handler();
        $data = $redis->lpop($key);
        $jsonData = $data ? json_decode($data, true) : [];
        return $jsonData ? $jsonData : $data;
    }

    /**
     * 清除缓存
     * @param $key 键名
     * @return mixed
     */
    public static function clear($key)
    {
        $redis = Cache::store('redis')->handler();
        return $redis->del($key);
    }

    /**
     * 按键名匹配删除
     * @param $key
     * @return bool
     */
    public static function keyDel($key){
        $redis = Cache::store('redis')->handler();
        $keys = $redis->keys($key);
        foreach($keys as $key){
            $redis->del($key);
        }

        return true;
    }

    /**
     * 有效期设置
     * @param $key
     * @param $expire
     * @return mixed
     */
    public static function expire($key, $expire){
        $redis = Cache::store('redis')->handler();
        return $redis->expire($key, $expire);
    }

    /**
     * 原子锁
     * @param $key
     * @param $value
     * @param int $expire
     * @return mixed
     */
    public static function setnx($key, $value, $expire=0){
        $redis = Cache::store('redis')->handler();
        $res = $redis->setnx($key, $value);
        if($expire){
            $redis->expire($key, $expire);
        }

        return $res;
    }
}