<?php
namespace common\services;

use Yii;
use common\components\dict;

class baseService{
    /**
     * 通过主键Id从数据库取数据并生成缓存 (非强制更新缓存时（$forceUpdate=false），此缓存键必须不存在，否则报错--键已存在!)
     * @param $id       表主键ID
     * @param $model    表对应的模型
     * @param string $cacheKey      缓存键
     * @param int $expire           过期时间（默认无过期）
     * @param bool $forceUpdate     是否强制从数据库里取，并更新缓存数据（false:默认在键不存时设置缓存; true:强制从数据库取数据更新缓）
     * @return mixed
     */
    public static function setCacheById($id, $model, $cacheKey = '', $expire = 0, $forceUpdate = false){
        $fresh = false;//是否更新缓存

        if(empty($cacheKey)){
            $preKey	= dict::getCacheKey($model);
            if(empty($preKey)){
                throw new \Exception('get' . $model . 'model cache key fail from dict::getCacheKey');
            }
            $cacheKey = $preKey.$id;
        }

        $class = "\common\models\\$model";
        //是否存在此键值
        $exist = Yii::$app->redis->executeCommand('EXISTS', [$cacheKey]);
        if(!$exist){//不存在 此键值
            $data = $class::find()->where(['id' => $id])->asArray()->one();
            $fresh = empty($data) ? false : true;
        }else{//存在 此键值(是否强制从数据库里取，并更新缓存数据)
            if($forceUpdate){
                $data = $class::find()->where(['id' => $id])->asArray()->one();
                $fresh = empty($data) ? false : true;
            }else{
                throw new \Exception('Cache Key: '. $cacheKey . ' is existed');
            }
        }

        if($fresh){
            Yii::$app->redis->executeCommand('DEL', [$cacheKey]);//先删除
            $params	= [$cacheKey];

            if(!empty($data)){
                foreach($data as $key => $val){
                    $params[] = $key;
                    $params[] = $val;
                }
            }
            Yii::$app->redis->executeCommand('HMSET', $params);
            if($expire > 0){
                Yii::$app->redis->executeCommand('EXPIRE', [$cacheKey, $expire]);
            }
        }

        return $data;
    }

    /**
     * 传数组数据更新缓存
     * @param $data     数据
     * @param string $cacheKey  缓存键
     * @param int $expire   过期时间（默认无过期）
     * @return bool
     * @throws \Exception
     */
    public static function setCacheByData(array $data, $model, $cacheKey = '', $expire = 0){
        $fresh = false;//是否更新缓存

        if(empty($cacheKey)){
            $preKey	= dict::getCacheKey($model);
            if(empty($preKey)){
                throw new \Exception('get ' . $model . ' model cache key fail from dict::getCacheKey');
            }
            if(!isset($data['id'])){
                throw new \Exception('parameter data array not exist key id');
            }
            $cacheKey = $preKey.$data['id'];
        }

        //是否存在 此键值
        $exist = Yii::$app->redis->executeCommand('EXISTS', [$cacheKey]);
        if(!$exist){//不存在 此键值

        }

        $fresh = (!empty($data)) ? true : false;//是数组且不为空

        if($fresh){
            $params	= [$cacheKey];

            foreach($data as $key => $val){
                $params[] = $key;
                $params[] = $val;
            }

            Yii::$app->redis->executeCommand('HMSET', $params);
            if($expire > 0){
                Yii::$app->redis->executeCommand('EXPIRE', [$cacheKey, $expire]);
            }
            return true;
        }

        return false;
    }

    /**
     * 传数组数据更新缓存(此缓存键必须存在，否则报错--键不存在! ///- 安全起见，只能函数setCacheById、setCacheByData生成新键 -///)
     * @param $data     数据
     * @param string $cacheKey  缓存键
     * @param int $expire   过期时间（默认无过期）
     * @return bool
     * @throws \Exception
     */
    public static function updateCacheByData(array $data, $model, $cacheKey = '', $expire = 0){
        $fresh = false;//是否更新缓存

        if(empty($cacheKey)){
            $preKey	= dict::getCacheKey($model);
            if(empty($preKey)){
                throw new \Exception('get ' . $model . ' model cache key fail from dict::getCacheKey');
            }
            if(!isset($data['id'])){
                throw new \Exception('parameter data array not exist key id');
            }
            $cacheKey = $preKey.$data['id'];
        }

        //是否存在 此键值
        $exist = Yii::$app->redis->executeCommand('EXISTS', [$cacheKey]);
        if(!$exist){//不存在 此键值
            throw new \Exception('Cache Key: '. $cacheKey . ' is not existed');
        }

        $fresh = (!empty($data)) ? true : false;//是数组且不为空

        if($fresh){
            $params	= [$cacheKey];

            foreach($data as $key => $val){
                $params[] = $key;
                $params[] = $val;
            }

            Yii::$app->redis->executeCommand('HMSET', $params);
            if($expire > 0){
                Yii::$app->redis->executeCommand('EXPIRE', [$cacheKey, $expire]);
            }
            return true;
        }

        return false;
    }

    /**
     * 获取Hgetall(哈希表)缓存
     * @param $cacheKey
     * @return array
     */
    public static function  getCache($cacheKey){
        $cacheData = Yii::$app->redis->executeCommand('HGETALL', [$cacheKey]);
        //$cacheData = Yii::$app->redis->hGetAll($key);
        if(!empty($cacheData)){
            $arr = [];
            $i = 0;
            $x = 0;
            foreach($cacheData as $key => $val){
                $i++;
                if($i%2 == 0){
                    $arr[$x]['value'] = $val;
                    $x++;
                }else{
                    $arr[$x]['key'] = $val;
                }
            }

            $cacheDataArr = [];
            foreach($arr as $key => $val){
                $cacheDataArr[$val['key']] = $val['value'];
            }

            return $cacheDataArr;
        }

        return false;
    }
}