MemberCount/index.js

require("dotenv").config();
const Discord = require("discord.js");
const colors = require("colors");
const sqlite3 = require("sqlite3").verbose();

const db = new sqlite3.Database("./database.db", (err) => {
	if (err) {
		console.error(err.message);
	}
	console.log(`${colors.cyan("[INFO]")} Connected to the database!`);
});

db.on("open", () => {
	db.run("CREATE TABLE IF NOT EXISTS guilds (guild_id TEXT PRIMARY KEY, channel_id TEXT UNIQUE);");
})

const client = new Discord.Client({
	intents: [
		"Guilds",
		"GuildMembers"
	]
});
function updateChannels() {
	// Get all channels from the database, loop through them and check if each exists, ones that dont, remove them, ones that do, update their name to `Member Count: ${client.guilds.cache.get(row.guild_id).members.cache.filter(member => !member.user.bot).size}`. Do one at a time with a 1 second delay between each.
	db.all("SELECT * FROM guilds;", (err, rows) => {
		if (err) {
			console.error(err.message);
		}
		var delay = 0;
		rows.forEach((row) => {
			setTimeout(async () => {
				const channel = client.channels.cache.get(row.channel_id);
				if (!channel) {
					db.run("DELETE FROM guilds WHERE guild_id = ?;", [row.guild_id], (err) => {
						if (err) {
							console.error(err.message);
						}
					});
				} else {
					await client.guilds.cache.get(row.guild_id).members.fetch();
					console.log(`${colors.cyan("[INFO]")} Updating channel ${channel.name} in guild ${client.guilds.cache.get(row.guild_id).name} (${row.guild_id})`);
					channel.setName(`Member Count: ${client.guilds.cache.get(row.guild_id).members.cache.filter(member => !member.user.bot).size}`).catch(err => {
						console.log(`${colors.red("[ERROR]")} Cannot update channel name. ID: ${channel.id} | Error: ${err}`);
						db.run("DELETE FROM guilds WHERE guild_id = ?;", [row.guild_id], (err) => {
							if (err) {
								console.error(err.message);
							}
						});
					});;
				}
				delay++;
			}, delay * 1000)
		});
	});
}

function updateChannel(guild_id) {
	db.get("SELECT * FROM guilds WHERE guild_id = ?;", [guild_id], (err, row) => {
		if (err) {
			console.error(err.message);
		}
		client.channels.fetch(row.channel_id).then(async channel => {
			console.log(channel.name)
			if (!channel) {
				db.run("DELETE FROM guilds WHERE guild_id = ?;", [guild_id], (err) => {
					if (err) {
						console.error(err.message);
					}
				});
			} else {
				await client.guilds.cache.get(guild_id).members.fetch();
				console.log(`${colors.cyan("[INFO]")} Updating channel ${channel.name} in guild ${client.guilds.cache.get(row.guild_id).name} (${row.guild_id})`);
				channel.setName(`Member Count: ${client.guilds.cache.get(guild_id).members.cache.filter(member => !member.user.bot).size}`).catch(err => {
					console.log(`${colors.red("[ERROR]")} Cannot update channel name. ID: ${channel.id} | Error: ${err}`);
					db.run("DELETE FROM guilds WHERE guild_id = ?;", [guild_id], (err) => {
						if (err) {
							console.error(err.message);
						}
					});
				});
			}
		})
	});
};

client.on("ready", async () => {
	console.log(`${colors.cyan("[INFO]")} Logged in as ${client.user.displayName}!`);

	// Register slash commands
	const commands = await require("./commands.json");
	await (async () => {
		try {
			console.log(`${colors.cyan("[INFO]")} Registering Commands...`)
			//Global
			const rest = await new Discord.REST({ version: "10" }).setToken(client.token);
			await rest.put(Discord.Routes.applicationCommands(client.user.id), { body: commands })
			console.log(`${colors.cyan("[INFO]")} Successfully registered commands.`);
		} catch (error) {
			console.error(error);
		}
	})();
	updateChannels();
	setInterval(updateChannels, 60000);
});

client.on("interactionCreate", async (interaction) => {
	if (!interaction.isCommand()) return;
	switch (interaction.commandName) {
		case "setchannel":
			// Check if the user has manage channels
			if (!interaction.member.permissions.has("MANAGE_CHANNELS")) {
				return interaction.reply({ content: "You do not have permission to use this command!", ephemeral: true });
			}

			const channel = interaction.options.getChannel("channel");
			// Check that the channel is in the same guild as the command interaction
			if (channel.guild.id !== interaction.guild.id) {
				return interaction.reply({ content: "The channel must be in the same guild as the command interaction!", ephemeral: true });
			}
			console.log(channel.id)
			// All is well, set the channel in the database
			db.run("INSERT OR REPLACE INTO guilds (guild_id, channel_id) VALUES (?, ?);", [interaction.guild.id, channel.id], (err) => {
				if (err) {
					console.error(err.message);
					return interaction.reply({ content: "An error occurred while setting the channel!", ephemeral: true });
				}
				interaction.reply({ content: `Set the channel to <#${channel.id}>!`, ephemeral: true });
				updateChannel(interaction.guild.id);
			});
			break;
	}
});

client.on("guildMemberAdd", (member) => {
	updateChannel(member.guild.id);
});

client.on("guildMemberRemove", (member) => {
	updateChannel(member.guild.id);
});

client.login(process.env.TOKEN);