user registration, bal, change_bal, transfer

commands/change_bal.ts

@@ -0,0 +1,34 @@
+import type { ChatInputCommandInteraction } from "discord.js";
+
+import type { CommandData } from "./index";
+import type { User } from "../db";
+import { get_user, add_balance, sub_balance } from "../db";
+import { BotError } from "./error";
+
+async function run(interaction: ChatInputCommandInteraction, _user: User) {
+  const options = interaction.options;
+  const target_id: string = (await options.get("target")).user.id;
+  const amount: number = (await options.get("amount")).value as number;
+  const negative_allowed: boolean = ((await options.get("negative_allowed"))?.value ?? false) as boolean;
+  let change_user = await get_user(target_id);
+  if (!change_user) throw new BotError("Target is not registered");
+  if (amount >= 0) {
+    await add_balance(target_id, amount);
+  } else {
+    const success = await sub_balance(target_id, -amount, negative_allowed);
+    if (!success) throw new BotError("Failed because would make target balance negative, so `negative_allowed` must be true to do this");
+  }
+  return await interaction.editReply(`Changed <@${target_id}> balance by ${amount}`);
+}
+
+const data: CommandData = {
+  name: "change_bal",
+  description: "Change a user's balance",
+  registered_only: true,
+  ephemeral: false,
+  admin_only: true,
+  run,
+};
+
+export default data;
+