'use strict';

/**
 * Module dependencies
 */
import * as mongo from 'mongodb';
import Favorite from '../../models/favorite';
import Post from '../../models/post';

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

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

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

		// if already favorited
		const exist = await Favorite.findOne({
			post_id: post._id,
			user_id: user._id
		});

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

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

		// Send response
		res();
	});
