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<?php
/**
 * 用于获取远程文件并缓存
 * CurlCache v1.0
 * Created by cr.
 * Date: 2015/12/03
 */

//namespace vendor\core;


class CurlCache
{
    /**
     * 请求地址
     * @var string
     */
    protected $url;

    /**
     * 缓存生存期
     * @var int
     */
    protected $expires;

    /**
     * 请求超时
     * @var int
     */
    protected $timeOut;

    /**
     * 是否开启缓存
     * @var int
     */
    protected $cacheEna;

    /**
     * 是否显示debug信息
     * @var bool
     */
    protected $debug;

    /**
     * 其他不用配置的内部属性
     */
    protected $path;

    protected $filename;

    protected $curlData;

    protected $curlHeader;

    protected $curlError;

    protected $cacheData;

    public $data;
    /**
     * CurlCache constructor.
     * @param int $expires
     * @param int $timeOut
     * @param bool|true $cacheEna
     * @param bool|false $debug
     */
    public function __construct($expires=3600, $timeOut=30, $cacheEna=true, $debug=false)
    {
        $this->expires=$expires;
        $this->timeOut=$timeOut;
        $this->cacheEna=$cacheEna;
        $this->debug=$debug;
    }

    /**
     * 检测并创建目录
     * @return bool
     */
    public function mkdirs(){
        if(is_dir($this->path)){
            return true;
        }else{
            return mkdir($this->path, 777, true);
        }
    }

    /**
     * 设置缓存文件相关信息
     * @param $url
     */
    public function setCacheFileInfo($url){
        $this->url=$url;
        $this->path=dirname(__FILE__).'/cache/';
        $this->filename=$this->url?md5($this->url):'null';
    }

    /**
     * 主方法，取得数据
     * @param $url
     * @return bool|string
     */
    public function get($url){
        $this->setCacheFileInfo($url);
        if($this->cacheEna) $this->data=unserialize($this->getCache($url));
        if(!$this->data) $this->data=$this->curlGet($url);
        if($this->data && $this->cacheEna) $this->setCache($url,serialize($this->data));
        return $this->data->contents;
    }

    /**
     * curl GET 请求数据
     * @param $url
     * @return string
     */
    public function curlGet($url){
        if($this->debug && $url=='') echo('请求URL为空，请检查');
        $return=new stdClass();
        $ch = curl_init ();
        curl_setopt($ch, CURLOPT_URL,$url );
        curl_setopt($ch, CURLOPT_TIMEOUT, $this->timeOut);
        curl_setopt($ch, CURLOPT_HEADER, 0 );
        curl_setopt($ch, CURLOPT_RETURNTRANSFER, 1 );
        curl_setopt($ch, CURLOPT_FOLLOWLOCATION, 1);
        $this->curlData=curl_exec($ch);
        $this->curlHeader=curl_getinfo($ch);
        $this->curlError=curl_error($ch);
        $return->header=$this->curlHeader;
        $return->contents=$this->curlData;
        curl_close($ch);
        if((!$this->curlData || $this->curlHeader['http_code'] != '200') && $this->debug ) echo '请求失败，错误信息：'.$this->curlError;
        else return $return;
    }

    /**
     * 取得缓存数据
     * @param $url
     * @return bool|string
     */
    public function getCache($url){
        $this->setCacheFileInfo($url);
        if(file_exists($this->path.$this->filename)){
            if(time() - filemtime($this->path.$this->filename) < $this->expires) $this->cacheData=file_get_contents($this->path.$this->filename);
            else if($this->debug) echo '缓存文件已过期';
            if($this->cacheData) return $this->cacheData;else if($this->debug) echo '缓存文件内容为空';
        }else{
            //if($this->debug) echo '缓存文件不存在';
            return false;
        }
    }

    /**
     * 写入缓存数据
     * @param $url
     * @param $data
     */
    public function setCache($url,$data){
        $this->setCacheFileInfo($url);
        if(!$this->mkdirs() && $this->debug) echo('创建缓存目录失败:'.$this->path);
        if($data){
            if(!file_put_contents($this->path.$this->filename,$data) && $this->debug){
                echo '写入缓存失败 File:'.$this->path.$this->filename;
            }
        }else{
            if($this->debug) echo '数据为空，不写入缓存';
        }
    }



}