Use IoC, impliment queue

src/bot.ts

@@ -0,0 +1,86 @@
+import makeDir from 'make-dir';
+import {Client, Message, Collection} from 'discord.js';
+import {inject, injectable} from 'inversify';
+import {TYPES} from './types';
+import {Settings} from './models';
+import {sequelize} from './utils/db';
+import handleGuildCreate from './events/guild-create';
+import container from './inversify.config';
+import Command from './commands';
+
+@injectable()
+export default class {
+  private readonly client: Client;
+  private readonly token: string;
+  private readonly clientId: string;
+  private readonly dataDir: string;
+  private readonly cacheDir: string;
+  private readonly commands!: Collection<string, Command>;
+
+  constructor(@inject(TYPES.Client) client: Client, @inject(TYPES.Config.DISCORD_TOKEN) token: string, @inject(TYPES.Config.DISCORD_CLIENT_ID) clientId: string, @inject(TYPES.Config.DATA_DIR) dataDir: string, @inject(TYPES.Config.CACHE_DIR) cacheDir: string) {
+    this.client = client;
+    this.token = token;
+    this.clientId = clientId;
+    this.dataDir = dataDir;
+    this.cacheDir = cacheDir;
+    this.commands = new Collection();
+  }
+
+  public async listen(): Promise<string> {
+    // Load in commands
+    container.getAll<Command>(TYPES.Command).forEach(command => {
+      this.commands.set(command.name, command);
+    });
+
+    this.client.on('message', async (msg: Message) => {
+      // Get guild settings
+      if (!msg.guild) {
+        return;
+      }
+
+      const settings = await Settings.findByPk(msg.guild.id);
+
+      if (!settings) {
+        // Got into a bad state, send owner welcome message
+        return this.client.emit('guildCreate', msg.guild);
+      }
+
+      const {prefix, channel} = settings;
+
+      if (!msg.content.startsWith(prefix) || msg.author.bot || msg.channel.id !== channel) {
+        return;
+      }
+
+      const args = msg.content.slice(prefix.length).split(/ +/);
+      const command = args.shift()!.toLowerCase();
+
+      if (!this.commands.has(command)) {
+        return;
+      }
+
+      try {
+        const handler = this.commands.get(command);
+
+        handler!.execute(msg, args);
+      } catch (error) {
+        console.error(error);
+        msg.reply('there was an error trying to execute that command!');
+      }
+    });
+
+    this.client.on('ready', async () => {
+      // Create directory if necessary
+      await makeDir(this.dataDir);
+      await makeDir(this.cacheDir);
+
+      await sequelize.sync({});
+
+      console.log(`Ready! Invite the bot with https://discordapp.com/oauth2/authorize?client_id=${this.clientId}&scope=bot`);
+    });
+
+    // Register event handlers
+    this.client.on('guildCreate', handleGuildCreate);
+
+    return this.client.login(this.token);
+  }
+}