buy, use, delete, edit item

commands/buy.ts

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+import type { ChatInputCommandInteraction } from "discord.js";
+
+import type { CommandData } from "./index";
+import type { StoreItem, User } from "../db";
+import { get_item, add_item_to_user, sub_balance } from "../db";
+import { BotError } from "./common/error";
+import { item_name_autocomplete } from "./common/autocompletes";
+import { has_role } from "../util";
+import config from "../config.json";
+
+async function run(interaction: ChatInputCommandInteraction, user: User) {
+  const options = interaction.options;
+  const name: string = (await options.get("name")).value as string;
+  const quantity: number = (await options.get("quantity")).value as number;
+  if (quantity <= 0) throw new BotError("Can't buy 0 or less of an item. Nice try");
+  const item = await get_item(name);
+  if (!item) throw new BotError("Item does not exist");
+  if (item.roles_required.length > 0) {
+    for (const role_id of item.roles_required) {
+      if (!has_role(interaction, role_id)) throw new BotError("Missing one of the required roles to buy this item");
+    }
+  }
+  const total_cost = item.price * quantity;
+  if (!(await sub_balance(user.user, total_cost))) throw new BotError("Not enough balance to buy this item");
+  await add_item_to_user(user.user, item.name, quantity);
+  return await interaction.editReply(`Bought ${quantity} of \`${name}\` for ${total_cost} ${ total_cost === 1 ? config.currency : config.currency_plural }`);
+}
+
+const data: CommandData = {
+  name: "buy",
+  description: "Buy an item from the store",
+  registered_only: true,
+  ephemeral: false,
+  admin_only: false,
+  run,
+  autocomplete: item_name_autocomplete, //autocompletes for the "name" option
+};
+
+export default data;
+
+