/**
  * @data 文章发布
  *    文章详情散列表中递增ID，讲文章发布者ID写入投票用户集合中，设置投票时间为一周
  *    讲文章内容写入文章散列中，讲文章写入文章评分有序集合和文章发布有序集合中
  * @author Lorne
  * @date 2017-03-03
  */
  public function post_article($user){
    $VOTE_SCORE = 24;
    $redis = $this -> redis;
    $key= "queue";
    $ONE_WEEK_IN_SECONDS= 7*86400;
    $redis -> multi($key);
    //生成新的文章id
    $article_id = $redis -> incr("article:",$key);

    //文章已投票用户名单
    $voted = "voted:".$article_id;
    $this->redis->sadd($voted,$user,$key);
    //设置过期时间(为1周)
    $this->redis->expipre($voted,$ONE_WEEK_IN_SECONDS,$key);

    //获取现在的时间
    $now =time();
    $article = "article:".$article_id;
    $data = ['title'=>'测试1','link'=>'www.hahaha.com','poster'=>$user,'tine'=>$now,'votes'=>1];
    //$data = json_encode($data);
    $redis -> hmset($article,$data,$key);

    //将文章添加到根据时间排序有序集合和根据评分排序有序结合中
    $this -> redis -> zadd("score:",1,$article,$key);
    $this -> redis -> zadd("time:",$now,$article,$key);

    $redis -> exec($key);
  }

/**
  * @data 用户投票
  *    获取文章的ID，用户ID，判断该篇文章是否已经过了投票时间，再判断用户是否已经投过票
  *    写入文章对应投票用户表中(voted:文章ID),对应的文章评分加，文章详情内容中的votes统计加1
  * @author Lorne
  * @date 2017-03-03
  */
  public function article_vote(){
    $ONE_WEEK_IN_SECONDS= 7*86400;
    $article = "article:3";
    $user = "user:7777";

    $redis = $this -> redis;
    $key= "queue";
    $cutoff = time() - $ONE_WEEK_IN_SECONDS;
    //文章发布时间和投票截止日期对比
    if($redis->zscore('time:',$article,$key) < $cutoff){
      var_dump("该文章已过投票时间!");exit;
    }
    $article_id = explode(':',$article)['1'];
    if($redis->sadd('voted:'.$article_id,$user,$key)){
      $redis -> zincrby('score:',$article,1,$key);
      $redis -> hincrby($article,'votes',1,$key);
    }else{
      var_dump("您已经投过票了!");exit;
    }
  }

/**
  * @data 文章列表分页
  *    对文章评分有序集合或者时间发布有序集合做分页处理，获取文章ID后，去文章详情散列表中查询该文章详情
  * @author Lorne
  * @date 2017-03-03
  */
  public function get_articles($page =1,$orders =''){
    $redis = $this->redis;
    $db = "queue";
    //$orders = "time:";
    $per_page = 3;
    $start = ($page-1)*$per_page;
    $end = $start + $per_page -1;
    $ids = $redis -> zrevrange($orders,$start,$end,$db);
    foreach($ids as $key=>$val){
      $data = $redis -> hgetall($val,$db);
      $data['id'] = $val;
      $articles[] = $data;
    }
    return $articles;
  }

/**
  * @data 文章添加组和移除组
  *    讲该文章加入不同的分组中，或者从个分组中移除该篇文章
  * @author Lorne
  * @date 2017-03-03
  */
  public function add_remove_group($article_id,$to_add = [],$to_remove = []){
    $redis = $this->redis;
    $db = "queue";
    $article = "article:".$article_id;
    foreach($to_add as $key=>$val){
      $redis -> sadd('group:'.$val,$article,$db);
    }
    foreach($to_remove as $key=>$val){
      $redis -> srem('grouo:'.$val,$article,$db);
    }
  }

/**
  * @data 组集合中的文章根据评分或者时间分页排序
  *    
  * @author Lorne
  * @date 2017-03-03
  */
  public function get_grouop_articles($orders = "time:"){
    $redis = $this -> redis;
    $db = "queue";
    $group = '开发';
    $key = $orders.$group;
    if($redis -> exists($key,$db)){
      $argument = 2;
      $data = $redis -> zinterstore($key,$argument,['group:'.$group,$orders],$db);
      //$this -> expire($key,60,$db);
    }
    return $this->get_articles(2,$key);
  }