discordeno/plugins/permissions/src/connectToVoiceChannels.ts

import { BotWithCache, ChannelTypes, PermissionStrings } from "../deps.ts";
import { requireBotChannelPermissions } from "./permissions.ts";

export default function connectToVoiceChannel(bot: BotWithCache) {
  const connectToVoiceChannelOld = bot.helpers.connectToVoiceChannel;

  bot.helpers.connectToVoiceChannel = async function (
    guildId,
    channelId,
    options
  ) {
    const channel = await bot.channels.get(channelId);
    if (!channel) throw new Error("CHANNEL_NOT_FOUND");

    if (
      [ChannelTypes.GuildStageVoice, ChannelTypes.GuildVoice].includes(
        channel.type
      )
    )
      throw new Error("INVALID_CHANNEL_TYPE");

    const guild = channel?.guildId && bot.guilds.get(channel.guildId);
    if (!guild) throw new Error("GUILD_NOT_FOUND");

    // Permissions needed for the bot to connect
    // CONNECT is needed
    const permsNeeded: PermissionStrings[] = ["CONNECT"];

    // Check if there is space for the bot if channel has user limit
    // Having MANAGE_CHANNELS permissions bypasses the limit
    // --> Add MANAGE_CHANNELS perm to the check if it is needed
    if (
      channel.userLimit &&
      guild.voiceStates.filter((vs) => vs.channelId === channelId).size >=
        channel.userLimit
    )
      permsNeeded.push("MANAGE_CHANNELS");

    await requireBotChannelPermissions(bot, channel, permsNeeded);

    return connectToVoiceChannelOld(guildId, channelId, options);
  };
}