/**
  * @data 文章發布
  *    文章詳情散列表中遞增ID，講文章發布者ID寫入投票用戶集合中，設置投票時間為一周
  *    講文章內容寫入文章散列中，講文章寫入文章評分有序集合和文章發布有序集合中
  * @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);

    //文章已投票用戶名單
    $voted = "voted:".$article_id;
    $this->redis->sadd($voted,$user,$key);
    //設置過期時間(為1周)
    $this->redis->expipre($voted,$ONE_WEEK_IN_SECONDS,$key);

    //獲取現在的時間
    $now =time();
    $article = "article:".$article_id;
    $data = ['title'=>'測試1','link'=>'www.hahaha.com','poster'=>$user,'tine'=>$now,'votes'=>1];
    //$data = json_encode($data);
    $redis -> hmset($article,$data,$key);

    //將文章添加到根據時間排序有序集合和根據評分排序有序結合中
    $this -> redis -> zadd("score:",1,$article,$key);
    $this -> redis -> zadd("time:",$now,$article,$key);

    $redis -> exec($key);
  }

/**
  * @data 用戶投票
  *    獲取文章的ID，用戶ID，判斷該篇文章是否已經過了投票時間，再判斷用戶是否已經投過票
  *    寫入文章對應投票用戶表中(voted:文章ID),對應的文章評分加，文章詳情內容中的votes統計加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() - $ONE_WEEK_IN_SECONDS;
    //文章發布時間和投票截止日期對比
    if($redis->zscore('time:',$article,$key) < $cutoff){
      var_dump("該文章已過投票時間!");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("您已經投過票了!");exit;
    }
  }

/**
  * @data 文章列表分頁
  *    對文章評分有序集合或者時間發布有序集合做分頁處理，獲取文章ID后，去文章詳情散列表中查詢該文章詳情
  * @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 文章添加組和移除組
  *    講該文章加入不同的分組中，或者從個分組中移除該篇文章
  * @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 組集合中的文章根據評分或者時間分頁排序
  *    
  * @author Lorne
  * @date 2017-03-03
  */
  public function get_grouop_articles($orders = "time:"){
    $redis = $this -> redis;
    $db = "queue";
    $group = '開發';
    $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);
  }