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/**
* Module dependencies
*/
import $ from 'cafy';
import Post from '../../models/post';
import User from '../../models/user';
import serialize from '../../serializers/user';
module.exports = (params, me) => new Promise(async (res, rej) => {
// Get 'user_id' parameter
const [userId, userIdErr] = $(params.user_id).id().$;
if (userIdErr) return rej('invalid user_id param');
// Get 'limit' parameter
const [limit = 10, limitErr] = $(params.limit).optional.number().range(1, 100).$;
if (limitErr) return rej('invalid limit param');
// Lookup user
const user = await User.findOne({
_id: userId
}, {
fields: {
_id: true
}
});
if (user === null) {
return rej('user not found');
}
// Fetch recent posts
const recentPosts = await Post.find({
user_id: user._id,
reply_id: {
$exists: true,
$ne: null
}
}, {
sort: {
_id: -1
},
limit: 1000,
fields: {
_id: false,
reply_id: true
}
});
// 投稿が少なかったら中断
if (recentPosts.length === 0) {
return res([]);
}
const replyTargetPosts = await Post.find({
_id: {
$in: recentPosts.map(p => p.reply_id)
},
user_id: {
$ne: user._id
}
}, {
fields: {
_id: false,
user_id: true
}
});
const repliedUsers = {};
// Extract replies from recent posts
replyTargetPosts.forEach(post => {
const userId = post.user_id.toString();
if (repliedUsers[userId]) {
repliedUsers[userId]++;
} else {
repliedUsers[userId] = 1;
}
});
// Calc peak
let peak = 0;
Object.keys(repliedUsers).forEach(user => {
if (repliedUsers[user] > peak) peak = repliedUsers[user];
});
// Sort replies by frequency
const repliedUsersSorted = Object.keys(repliedUsers).sort((a, b) => repliedUsers[b] - repliedUsers[a]);
// Extract top replied users
const topRepliedUsers = repliedUsersSorted.slice(0, limit);
// Make replies object (includes weights)
const repliesObj = await Promise.all(topRepliedUsers.map(async (user) => ({
user: await serialize(user, me, { detail: true }),
weight: repliedUsers[user] / peak
})));
// Response
res(repliesObj);
});
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