Add fm set username command

Beginning of the command. Can't do anything other than setting and
updating your lastfm username.

commands/misc/fm.js

@@ -0,0 +1,21 @@
+const fmlogin = require("../../util/lastfm/fmlogin");
+
+module.exports = {
+    name: 'fm',
+    description: 'Last fm commands. See `<prefix>help fm` for more info.',
+    moreHelp: ["Set username: `<prefix>fm set <lastfm_username>`",],
+    async execute({ message, args }) {
+        let sendText = "Something went wrong.";
+        switch (args[0]) {
+            case "help":
+                sendText = this.moreHelp;
+                break;
+            case "set":
+                sendText = await fmlogin(message.author.id, args[1]);
+                break;
+            default:
+                break;
+        }
+        message.channel.send(sendText);
+    }
+};

server.js

@@ -17,6 +17,8 @@ async function checkAndConvertJSONToSQL(){
 	}
 }
 const createDatabaseTables = require('./server/createDatabaseTables');
+const createLastfmTable = require('./server/createLastfmTable');
+createLastfmTable();
 checkAndConvertJSONToSQL();
 const Discord = require('discord.js');
 const client = new Discord.Client({ intents: [Discord.Intents.FLAGS.GUILDS, Discord.Intents.FLAGS.GUILD_MESSAGES, Discord.Intents.FLAGS.GUILD_PRESENCES] });

server/createLastfmTable.js

@@ -0,0 +1,21 @@
+const sqlite3 = require('sqlite3').verbose();
+module.exports = async function () { 
+    const db = new sqlite3.Database('data/database.db');
+    return new Promise ((resolve, reject)=>{
+        db.run(
+            `CREATE TABLE IF NOT EXISTS lastfm (
+                        userID INTEGER PRIMARY KEY, 
+                        lastfmUsername TEXT)`,
+            (err) => {
+                if (err) {
+                    console.error(`Error while creating table 'lastfm': ${err}`);
+                    reject(err);
+                } else {
+                    console.log("Table 'lastfm' created successfully.");
+                    resolve();
+                }
+                db.close();
+            }
+        );
+    })
+}

util/lastfm/fmlogin.js

@@ -0,0 +1,65 @@
+const sqlite3 = require('sqlite3').verbose();
+module.exports = async function(userID, lastfmUsername) {
+    let sendText = "";
+    // If the user already has a last.fm username set, just update it.
+    let entryExists = await new Promise((resolve, reject)=>{
+        const db = new sqlite3.Database('data/database.db');
+        db.get(
+            `SELECT * FROM lastfm WHERE userID = ?`,
+            [userID],
+            (error, row) => {
+                if (error) {
+                    console.error(error);
+                    reject(error);
+                } else {
+                    resolve(row);
+                }
+                db.close();
+            }
+        );
+    });
+    if (!entryExists) {
+
+        sendText = await new Promise((resolve, reject)=>{
+            const db = new sqlite3.Database('data/database.db');
+            
+            db.run(
+                `INSERT INTO lastfm (userID, lastfmUsername) VALUES (?, ?)`,
+                [userID, lastfmUsername],
+                function (error) {
+                    if (error) {
+                        console.error(error);
+                        let sendText = "Error while adding last.fm username. Check console.";
+                        reject(sendText);
+                    } else {
+                        let sendText = `Your last.fm username has been set to '${lastfmUsername}'.`;
+                        console.log(sendText);
+                        resolve(sendText);
+                    }
+                    db.close();
+                }
+            );
+        });
+    }else {
+        sendText = await new Promise((resolve, reject)=>{
+            const db = new sqlite3.Database('data/database.db');
+            db.run(
+                `UPDATE lastfm SET lastfmUsername = ? WHERE userID = ?`,
+                [lastfmUsername, userID],
+                function (error) {
+                    if (error) {
+                        console.error(error);
+                        let sendText = "Error while updating last.fm username. Check console.";
+                        reject(sendText);
+                    } else {
+                        let sendText = `Your last.fm username has been updated to '${lastfmUsername}'.`;
+                        console.log(sendText);
+                        resolve(sendText);
+                    }
+                    db.close();
+                }
+            );
+        });
+    }
+    return sendText;
+}