sendou.ink/discord-bot/commands/access.ts

import { SlashCommandBuilder } from "@discordjs/builders";
import { CacheType, CommandInteraction, GuildMember } from "discord.js";
import ids from "../ids";
import type { BotCommand } from "../types";
import { isPlusTierRoleId, plusTierToRoleId, usersWithAccess } from "../utils";

const COMMAND_NAME = "access";

export const accessCommand: BotCommand = {
  guilds: [ids.guilds.plusServer],
  name: COMMAND_NAME,
  builder: new SlashCommandBuilder()
    .setName(COMMAND_NAME)
    .setDescription(
      "Get the corresponding Plus Server membership role if you have access",
    ),
  execute: async ({ interaction }) => {
    await givePlusRoleToMember({
      interaction,
      member: interaction.member as GuildMember,
    });
  },
};

export async function givePlusRoleToMember({
  interaction,
  member,
}: {
  interaction?: CommandInteraction<CacheType>;
  member: GuildMember;
}) {
  const { users } = await usersWithAccessCached();
  const usersPlusTier = users[member.id];

  if (!usersPlusTier) {
    return interaction?.reply({
      content: "You currently don't have access",
      ephemeral: true,
    });
  }

  const targetRoleId = plusTierToRoleId(usersPlusTier);
  if (!targetRoleId) {
    throw new Error(`No role for plus tier ${usersPlusTier}`);
  }

  const roleManager = member.roles;
  const usersRoleIds = roleManager.cache.map((r) => r.id);
  const alreadyHasRole = usersRoleIds.some((id) => id === targetRoleId);

  if (alreadyHasRole) {
    return interaction?.reply({
      content: `You have access to +${usersPlusTier} and already have the role for it`,
      ephemeral: true,
    });
  }

  const roleIdsToDelete = usersRoleIds.filter(isPlusTierRoleId);

  for (const roleIdToDelete of roleIdsToDelete) {
    await roleManager.remove(roleIdToDelete);
  }

  await roleManager.add(targetRoleId);

  if (interaction) {
    return interaction.reply({
      content: `Gave the role giving access to +${usersPlusTier}`,
      ephemeral: true,
    });
  }
}

let cachedAt: Date | null = null;
let usersWithAccessCache: ReturnType<typeof usersWithAccess> | null = null;
async function usersWithAccessCached() {
  // fetch fresh data every hour because votings end at the hour
  if (
    !cachedAt ||
    !usersWithAccessCache ||
    cachedAt.getHours() !== new Date().getHours()
  ) {
    cachedAt = new Date();
    usersWithAccessCache = usersWithAccess();
  }

  return usersWithAccessCache;
}