/*
 * MHSF, Minehut Server List
 * All external content is rather licensed under the ECA Agreement
 * located here: https://mhsf.app/docs/legal/external-content-agreement
 *
 * All code under MHSF is licensed under the MIT License
 * by open source contributors
 *
 * Copyright (c) 2024 dvelo
 *
 * Permission is hereby granted, free of charge, to any person obtaining a copy
 * of this software and associated documentation files (the "Software"), to
 * deal in the Software without restriction, including without limitation the
 * rights to use, copy, modify, merge, publish, distribute, sublicense, and/or
 * sell copies of the Software, and to permit persons to whom the Software is
 * furnished to do so, subject to the following conditions:
 *
 * The above copyright notice and this permission notice shall be included in all
 * copies or substantial portions of the Software.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
 * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES
 * OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
 * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT
 * HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY,
 * WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
 * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
 * OTHER DEALINGS IN THE SOFTWARE.
 */

import { MongoClient } from "mongodb";
import { NextApiRequest, NextApiResponse } from "next";

export default async function handler(
  req: NextApiRequest,
  res: NextApiResponse
) {
    const client = new MongoClient(process.env.MONGO_DB as string);
    const db = client.db("mhsf").collection("history");
    const server = req.query.server as string;

    const months =  ['January', 'February', 'March', 'April', 'May', 'June', 'July', 'August', 'September', 'October', 'November', 'December']
	const result = await Promise.all([1,2,3,4,5,6,7,8,9,10,11,12].map(async (c) => {
		const results = await db.find({ 
			$and: [
				{ server },
				{ date: { $gte: new Date(new Date().getFullYear(), c - 1, 1), $lt: new Date(new Date().getFullYear(), c, 1) } }
			]
		}).toArray()

		if (results.length !== 0) {
			const averageNums = (results as any as {player_count: number}[]).map((x: {player_count: number}) => x.player_count)
			const average = averageNums.reduce((sum, val) => sum + val, 0) / averageNums.length;

			return { month: months[c - 1], result: Math.floor(average) };
		}
		return undefined;
	}));

	client.close()
	res.send({result: result.filter((c) => c !== undefined)});
}