var tag_ctrl = require('./tag');
var user_ctrl = require('./user');
var topic_ctrl = require('./topic');

var config = require('../config').config;
var EventProxy = require('eventproxy').EventProxy;

var sanitize = require('validator').sanitize;

exports.index = function(req,res,next){
  var page = Number(req.query.page) || 1;
  var keyword = req.query.q || ''; // in-site search
  keyword = keyword.trim();
  var limit = config.list_topic_count;

  var render = function(tags,topics,hot_topics,stars,tops,no_reply_topics,pages){
    var all_tags = tags.slice(0);

    // 计算最热标签
    tags.sort(function(tag_a,tag_b){
      if(tag_a.topic_count == tag_b.topic_count) return 0;
      if(tag_a.topic_count > tag_b.topic_count) return -1;
      if(tag_a.topic_count < tag_b.topic_count) return 1;
    });
    var hot_tags = tags.slice(0,5); 

    // 计算最新标签
    tags.sort(function(tag_a,tag_b){
      if(tag_a.create_at == tag_b.create_at) return 0;
      if(tag_a.create_at > tag_b.create_at) return -1;
      if(tag_a.create_at < tag_b.create_at) return 1;
    });
    var recent_tags = tags.slice(0,5);
    res.render('index', {
      tags: all_tags,
      topics: topics,
      current_page: page,
      list_topic_count: limit,
      recent_tags: recent_tags,
      hot_topics: hot_topics,
      stars: stars,
      tops: tops,
      no_reply_topics: no_reply_topics,
      pages: pages,
      keyword: keyword
    });
  };  
  
  var proxy = new EventProxy();
  proxy.assign('tags','topics','hot_topics','stars','tops','no_reply_topics','pages',render);
  
  tag_ctrl.get_all_tags(function(err,tags){
    if(err) return next(err);
    proxy.trigger('tags',tags);
  });

  var opt = {skip:(page-1)*limit, limit:limit, sort:[['top','desc'],['last_reply_at','desc']]};
  var query = {};
  if (keyword) {
    keyword = keyword.replace(/[\*\^\&\(\)\[\]\+\?\\]/g, '');
    query.title = new RegExp(keyword, 'i');
  }
  topic_ctrl.get_topics_by_query(query, opt,function(err,topics){
    if(err) return next(err);
    proxy.trigger('topics',topics);
  });
  opt = {limit:5, sort:[['visit_count','desc']]};
  topic_ctrl.get_topics_by_query({},opt,function(err,hot_topics){
    if(err) return next(err);
    proxy.trigger('hot_topics',hot_topics);
  });
  opt = {limit:5};
  user_ctrl.get_users_by_query({is_star:true},opt,function(err,users){
    if(err) return next(err);
    proxy.trigger('stars',users);
  }); 
  opt = {limit:10, sort:[['score','desc']]};
  user_ctrl.get_users_by_query({},opt,function(err,tops){
    if(err) return next(err);
    proxy.trigger('tops',tops);
  });
  opt = {limit:5, sort:[['create_at','desc']]};
  topic_ctrl.get_topics_by_query({reply_count:0},opt,function(err,no_reply_topics){
    if(err) return next(err);
    proxy.trigger('no_reply_topics',no_reply_topics);
  });
  topic_ctrl.get_count_by_query(query,function(err,all_topics_count){
    if(err) return next(err);
    var pages = Math.ceil(all_topics_count/limit);
    proxy.trigger('pages',pages);
  });
};