Sharkey/src/api/endpoints/posts/polls/vote.js

'use strict';

/**
 * Module dependencies
 */
import * as mongo from 'mongodb';
import Vote from '../../../models/poll-vote';
import Post from '../../../models/post';
import notify from '../../../common/notify';

/**
 * Vote poll of a post
 *
 * @param {Object} params
 * @param {Object} user
 * @return {Promise<object>}
 */
module.exports = (params, user) =>
	new Promise(async (res, rej) =>
{
	// Get 'post_id' parameter
	const postId = params.post_id;
	if (postId === undefined || postId === null) {
		return rej('post_id is required');
	}

	// Validate id
	if (!mongo.ObjectID.isValid(postId)) {
		return rej('incorrect post_id');
	}

	// Get votee
	const post = await Post.findOne({
		_id: new mongo.ObjectID(postId)
	});

	if (post === null) {
		return rej('post not found');
	}

	if (post.poll == null) {
		return rej('poll not found');
	}

	// Get 'choice' parameter
	const choice = params.choice;
	if (choice == null) {
		return rej('choice is required');
	}

	// Validate choice
	if (!post.poll.choices.some(x => x.id == choice)) {
		return rej('invalid choice');
	}

	// Check arleady voted
	const exist = await Vote.findOne({
		post_id: post._id,
		user_id: user._id
	});

	if (exist !== null) {
		return rej('already voted');
	}

	// Create vote
	await Vote.insert({
		created_at: new Date(),
		post_id: post._id,
		user_id: user._id,
		choice: choice
	});

	// Send response
	res();

	const inc = {};
	inc[`poll.choices.${ findWithAttr(post.poll.choices, 'id', choice) }.votes`] = 1;

	console.log(inc);

	// Increment likes count
	Post.update({ _id: post._id }, {
		$inc: inc
	});

	// Notify
	notify(post.user_id, user._id, 'poll_vote', {
		post_id: post._id,
		choice: choice
	});
});

function findWithAttr(array, attr, value) {
	for (let i = 0; i < array.length; i += 1) {
		if(array[i][attr] === value) {
			return i;
		}
	}
	return -1;
}