<?php

class ApolloClient
{
    protected $configServer; //apollo服务端地址
    protected $appId; //apollo配置项目的appid
    protected $cluster = 'default';
    protected $clientIp = '127.0.0.1'; //绑定IP做灰度发布用
    protected $notifications = array();
    protected $pullTimeout = 10; //获取某个namespace配置的请求超时时间
    protected $intervalTimeout = 10; //每次请求获取apollo配置变更时的超时时间
    public $save_dir; //配置保存目录
    public $publicConfigDir;   //公用部分配置路径

    private $checkNotificationsId=array();      //用于读取本地配置版本号，和线上对比（直接使用$notifications，发现读取接口超慢，所以另存一个变量）

    public $replaceValueArr=array();

    /**
     * ApolloClient constructor.
     * @param string $configServer apollo服务端地址
     * @param string $appId apollo配置项目的appid
     * @param array $namespaces apollo配置项目的namespace
     *  @param string $cluster 集群名，和项目的testing,dev等环境变量相同
     *  @param string $configFile 生成的配置文件地址
     *  @param string $config 本地公共的配置文件地址（不需要放到配置中心的本地配置项，一般为不需要变更的配置）
     */
    public function __construct($configServer, $appId, array $namespaces,$cluster,$configFile,$config='')
    {
        $this->configServer = $configServer;
        $this->appId = $appId;
        $this->cluster=$cluster;
        $configFiles=array();
        foreach ($namespaces as $namespace) {
            $this->notifications[$namespace] = array('namespaceName' => $namespace, 'notificationId' => -1);
            $configFiles[$namespace]=$this->getConfigFileNameSpace($cluster,$namespace);
        }
        $this->save_dir = $configFile;
        $this->publicConfigDir=$config;

        //读取配置的版本号

        if($configFiles){
            foreach ($configFiles as $namespace=>$file){

                $filePath= $this->publicConfigDir.$this->getConfigFileNameSpace($cluster,$namespace,1);
                if(file_exists($filePath)){
                    $configValues=require $filePath;
                    if(isset($configValues['params']['notification'][$namespace])){
                        $this->checkNotificationsId[$namespace] = array('namespaceName' => $namespace, 'notificationId' => $configValues['params']['notification'][$namespace]);
                    }
                    unset($configValues);
                }
            }
        }


    }

    public function setCluster($cluster)
    {
        $this->cluster = $cluster;
    }

    public function setClientIp($ip)
    {
        $this->clientIp = $ip;
    }

    public function setPullTimeout($pullTimeout) {
        $pullTimeout = intval($pullTimeout);
        if ($pullTimeout < 1 || $pullTimeout > 300) {
            return;
        }
        $this->pullTimeout = $pullTimeout;
    }

    public function setIntervalTimeout($intervalTimeout) {
        $intervalTimeout = intval($intervalTimeout);
        if ($intervalTimeout < 1 || $intervalTimeout > 300) {
            return;
        }
        $this->intervalTimeout = $intervalTimeout;
    }

    private function _getReleaseKey($config_file) {
        $releaseKey = '';
        if (file_exists($config_file)) {
            $last_config = require $config_file;
            is_array($last_config) && isset($last_config['releaseKey']) && $releaseKey = $last_config['releaseKey'];
        }
        return $releaseKey;
    }

    //获取单个namespace的配置文件路径
    public function getConfigFile($cluster) {
        return $this->save_dir.DIRECTORY_SEPARATOR.'main.'.$cluster.'.php';
    }

    //获取单个namespace/集群文件名
    public function getConfigFileNameSpace($cluster,$nameSpace,$public=0){
        $fileFirstName='';

        $nameSpace=substr($nameSpace, 0,strrpos($nameSpace, '.'));

        if($nameSpace=='application'){
            $fileFirstName='main';
        }else{
            $fileFirstName=$nameSpace;
        }
        if($cluster=='default'){
            $cluster='production';
        }
        if(!$public){
            return $this->save_dir.DIRECTORY_SEPARATOR.$fileFirstName.'.'.$cluster.'.php';
        }else{
            return $fileFirstName.'.'.$cluster.'.php';
        }


    }
    //获取单个namespace的配置-无缓存的方式
    public function pullConfig($namespaceName) {
        $base_api = rtrim($this->configServer, '/').'/configs/'.$this->appId.'/'.$this->cluster.'/';
        $api = $base_api.$namespaceName;

        $args = array();
        $args['ip'] = $this->clientIp;
        $config_file = $this->getConfigFile($this->cluster);
        $args['releaseKey'] = $this->_getReleaseKey($config_file);

        $api .= '?' . http_build_query($args);

        $ch = curl_init($api);
        curl_setopt($ch, CURLOPT_TIMEOUT, $this->pullTimeout);
        curl_setopt($ch, CURLOPT_HEADER, false);
        curl_setopt($ch, CURLOPT_RETURNTRANSFER, 1);

        $body = curl_exec($ch);
        $httpCode = curl_getinfo($ch, CURLINFO_HTTP_CODE);
        $error = curl_error($ch);
        curl_close($ch);

        if ($httpCode == 200) {
            $result = json_decode($body, true);
            $content = '<?php return ' . var_export($result, true) . ';';
            file_put_contents($config_file, $content);
        }elseif ($httpCode != 304) {
            echo $body ?: $error."\n";
            return false;
        }
        return true;
    }

    //获取多个namespace的配置-无缓存的方式
    public function pullConfigBatch(array $namespaceNames) {
        if (! $namespaceNames) return array();
        $multi_ch = curl_multi_init();
        $request_list = array();
        $base_url = rtrim($this->configServer, '/').'/configs/'.$this->appId.'/'.$this->cluster.'/';
        $query_args = array();
        $query_args['ip'] = $this->clientIp;
        foreach ($namespaceNames as $namespaceName=>$notificationId) {
            $request = array();
            $request_url = $base_url.$namespaceName;
           // $query_args['releaseKey'] = $this->_getReleaseKey($config_file);
           // print_r($query_args['releaseKey']);exit;
            $query_string = '?'.http_build_query($query_args);
            $request_url .= $query_string;
            $ch = curl_init($request_url);
            curl_setopt($ch, CURLOPT_TIMEOUT, $this->pullTimeout);
            curl_setopt($ch, CURLOPT_HEADER, false);
            curl_setopt($ch, CURLOPT_RETURNTRANSFER, 1);
            $request['ch'] = $ch;
            $request['notificationId'] = $notificationId;
            $request_list[$namespaceName] = $request;

            curl_multi_add_handle($multi_ch, $ch);
        }

        $active = null;
        // 执行批处理句柄
        do {
            $mrc = curl_multi_exec($multi_ch, $active);
        } while ($mrc == CURLM_CALL_MULTI_PERFORM);

        while ($active && $mrc == CURLM_OK) {
            if (curl_multi_select($multi_ch) == -1) {
                usleep(100);
            }
            do {
                $mrc = curl_multi_exec($multi_ch, $active);
            } while ($mrc == CURLM_CALL_MULTI_PERFORM);
            
        }

        // 获取结果
        $response_list = array();
        foreach ($request_list as $namespaceName => $req) {
            $response_list[$namespaceName] = true;
            $result = curl_multi_getcontent($req['ch']);
            $code = curl_getinfo($req['ch'], CURLINFO_HTTP_CODE);
            $error = curl_error($req['ch']);
            curl_multi_remove_handle($multi_ch,$req['ch']);
            curl_close($req['ch']);

            if ($code == 200) {
                $result = json_decode($result,true);
                $result=$this->YamalParseConfigData($result,$namespaceName,$req);

                $configFile=$this->getConfigFileNameSpace($this->cluster,$namespaceName);


                file_put_contents($configFile, $result);
            }elseif ($code != 304) {
                echo 'pull config of namespace['.$namespaceName.'] error:'.($result ?: $error)."\n";

                $response_list[$namespaceName] = false;
            }
        }
        curl_multi_close($multi_ch);
        return $response_list;
    }
    //格式化处理配置参数,合并公用配置
    protected function formatConfigData($result,$namespaceName){
        if(!$result || !is_array($result)) return null;
        $config=array();

        $publicConfig= require  $this->publicConfigDir.$this->getConfigFileNameSpace($this->cluster,$namespaceName,1);

        foreach ($result['configurations'] as $key => $value){
            if(strpos($key,'.')!==false){
                $keyArr=explode('.',$key);
                if($keyArr){
                    $realVal=json_decode($value,true)?json_decode($value,true):$value;
                    $keyStr='$config';
                    for($i=0;$i<count($keyArr);$i++){
                        $keyStr.="['".$keyArr[$i]."']";
                    }
                    $keyStr.='=$realVal;';
                    eval($keyStr);
                }
            }else{
                $realVal=json_decode($value,true)?json_decode($value,true):$value;
                $config[$key]=$realVal;

            }
        }
        $config=array_merge_recursive($publicConfig,$config);

        return $config;
    }
    //格式化处理配置参数,合并公用配置
    protected function YamalParseConfigData($result,$namespaceName,$req){
        if(!$result || !is_array($result)) return null;

        $content='';
        if(isset($result['configurations']) && isset($result['configurations']['content']) && $result['configurations']['content']){
            $config=yaml_parse($result['configurations']['content']);

            $replaceArr=$this->recur($config);
            if(strpos($namespaceName,'qcloud')!==false && isset($config['string'])){
                $content=" <?php \n ".implode("\n",$config['string'])." ";
            }else{
                $config['params']['notification'][$namespaceName]=$req['notificationId'];
                $content=" <?php return ".var_export($config,true)." ;";
                if($replaceArr){
                    $content=str_replace(array_keys($replaceArr),array_values($replaceArr),$content);
                }
            }
        }

        return $content;
    }
    protected function _listenChange(&$ch) {
        $base_url = rtrim($this->configServer, '/').'/notifications/v2?';
        $params = array();
        $params['appId'] = $this->appId;
        $params['cluster'] = $this->cluster;

        $params['notifications'] = json_encode(array_values($this->notifications));

        $query = http_build_query($params);

        curl_setopt($ch, CURLOPT_URL, $base_url.$query);
        $response = curl_exec($ch);
        $httpCode = curl_getinfo($ch,CURLINFO_HTTP_CODE);
        $error = curl_error($ch);

        if ($httpCode == 200) {
            $res = json_decode($response, true);

            $change_list=array();
            foreach ($res as $r) {
                if (!isset($this->checkNotificationsId[$r['namespaceName']]) || $r['notificationId'] != $this->checkNotificationsId[$r['namespaceName']]['notificationId']) {
                    $change_list[$r['namespaceName']] = $r['notificationId'];
                }
            }

            if($change_list){
                $response_list= $this->pullConfigBatch($change_list);

                foreach ($response_list as $name => $value){
                    if(!$value){
                        echo $name.':同步配置失败'.PHP_EOL;
                    }else{
                        echo $name.':同步配置成功'.PHP_EOL;
                    }
                }
            }

        }elseif ($httpCode != 304) {
            throw new \Exception($response ?: $error);
        }

    }

    /**
     * @param $callback 监听到配置变更时的回调处理
     * @return mixed
     */
    public function start() {
        $ch = curl_init();
        curl_setopt($ch, CURLOPT_TIMEOUT, $this->intervalTimeout);
        curl_setopt($ch, CURLOPT_HEADER, false);
        curl_setopt($ch, CURLOPT_RETURNTRANSFER, 1);
        try {
            $this->_listenChange($ch);
        }catch (\Exception $e) {
            curl_close($ch);
            return $e->getMessage();
        }
    }

    public function setReplaceArr($arr){
        $this->replaceValueArr=$arr;
    }
    //查找需要替换的变量
    function recur($array){
        $data = array();
        array_walk_recursive($array, function ($v, $k) use (&$data) {
            if(strpos($v,'////')!==false){
                $data["'".$v."'"]=str_replace('////','',$v);
            }
            if(strpos($k,'////')!==false){
                $data["'".$k."'"]=str_replace('////','',$k);
            }
        });
        return $data;
    }
}