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'use strict';
/**
* Module dependencies
*/
import validate from '../../validator';
import Post from '../../models/post';
import serialize from '../../serializers/post';
/**
* Show a context of a post
*
* @param {any} params
* @param {any} user
* @return {Promise<any>}
*/
module.exports = (params, user) =>
new Promise(async (res, rej) =>
{
// Get 'post_id' parameter
const [postId, postIdErr] = validate(params.post_id, 'id', true);
if (postIdErr) return rej('invalid post_id');
// Get 'limit' parameter
let [limit, limitErr] = validate(params.limit, 'number');
if (limitErr) return rej('invalid limit');
if (limit !== null) {
// From 1 to 100
if (!(1 <= limit && limit <= 100)) {
return rej('invalid limit range');
}
} else {
limit = 10;
}
// Get 'offset' parameter
let offset = params.offset;
if (offset !== undefined && offset !== null) {
offset = parseInt(offset, 10);
} else {
offset = 0;
}
// Lookup post
const post = await Post.findOne({
_id: new mongo.ObjectID(postId)
});
if (post === null) {
return rej('post not found', 'POST_NOT_FOUND');
}
const context = [];
let i = 0;
async function get(id) {
i++;
const p = await Post.findOne({ _id: id });
if (i > offset) {
context.push(p);
}
if (context.length == limit) {
return;
}
if (p.reply_to_id) {
await get(p.reply_to_id);
}
}
if (post.reply_to_id) {
await get(post.reply_to_id);
}
// Serialize
res(await Promise.all(context.map(async post =>
await serialize(post, user))));
});
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