simply-xp/src/addXP.js

A Simple, Easy and Beginner Friendly XP System

const levels = require("../src/models/level.js");
let {roleSetup} = require("../simplyxp");

/**
 * @param {Discord.Message} message
 * @param {string} userID
 * @param {string} guildID
 * @param {number} xp
 */

async function addXP(message, userID, guildID, xp) {
	if (!userID) throw new Error("[XP] User ID was not provided.");

	if (!guildID) throw new Error("[XP] Guild ID was not provided.");

	if (!xp) throw new Error("[XP] XP amount is not provided.");

	let {client} = message;

	let min;
	let max;
	if (xp.min) {
		if (!xp.max)
			throw new Error(
				"[XP] XP min amount is provided but max amount is not provided."
			);

		min = Number(xp.min);

		if (Number(xp.min).toString() === "NaN")
			throw new Error("[XP] XP amount (min) is not a number.");
	}

	if (xp.max) {
		if (!xp.min)
			throw new Error(
				"[XP] XP max amount is provided but min amount is not provided."
			);

		max = Number(xp.max);

		if (Number(xp.max).toString() === "NaN")
			throw new Error("[XP] XP amount (max) is not a number.");
	}

	if (xp.min && xp.max) {
		xp = Math.floor(Math.random() * (max - min) + min);
	}

	const user = await levels.findOne({user: userID, guild: guildID});

	let lvl = Math.floor(0.1 * Math.sqrt(xp));

	// TODO: FIX THIS xp = xp & level = lvl
	if (!user) {
		const newUser = new levels({
			user: userID,
			guild: guildID,
			xp: xp,
			level: lvl
		});

		await newUser.save().catch(() => console.log("[XP] Failed to save new user to database"));

		return {
			level: 0,
			exp: 0
		};
	}
	let level1 = user.level;

	user.xp += parseInt(xp, 10);
	user.level = Math.floor(0.1 * Math.sqrt(user.xp));

	await user.save().catch((e) => console.log(`[XP] Failed to add XP | User: ${userID} | Err: ${e}`));

	let level = user.level;

	xp = user.xp;

	if (user.xp === 0 || Math.sign(user.xp) === -1) {
		xp = 0;
	}

	if (level1 !== level) {
		let data = {
			xp,
			level,
			userID,
			guildID
		};

		let role = await roleSetup.find(client, guildID, level);

		client.emit("levelUp", message, data, role);
	}

	return {
		level,
		xp
	};
}

module.exports = addXP;