import { ChannelCreateEvent, Channel, ChannelType, emitEvent, getPermission, Snowflake } from "@fosscord/util";
import { HTTPError } from "lambert-server";

// TODO: DM channel
export async function createChannel(
	channel: Partial<Channel>,
	user_id: string = "0",
	opts?: {
		keepId?: boolean;
		skipExistsCheck?: boolean;
	}
) {
	// Always check if user has permission first
	const permissions = await getPermission(user_id, channel.guild_id);
	permissions.hasThrow("MANAGE_CHANNELS");

	switch (channel.type) {
		case ChannelType.GUILD_TEXT:
		case ChannelType.GUILD_VOICE:
			if (channel.parent_id && !opts?.skipExistsCheck) {
				const exists = await Channel.findOneOrFail({ id: channel.parent_id });
				if (!exists) throw new HTTPError("Parent id channel doesn't exist", 400);
				if (exists.guild_id !== channel.guild_id) throw new HTTPError("The category channel needs to be in the guild");
			}
			break;
		case ChannelType.GUILD_CATEGORY:
			break;
		case ChannelType.DM:
		case ChannelType.GROUP_DM:
			throw new HTTPError("You can't create a dm channel in a guild");
		// TODO: check if guild is community server
		case ChannelType.GUILD_STORE:
		case ChannelType.GUILD_NEWS:
		default:
			throw new HTTPError("Not yet supported");
	}

	if (!channel.permission_overwrites) channel.permission_overwrites = [];
	// TODO: auto generate position

	channel = await new Channel({
		...channel,
		...(!opts?.keepId && { id: Snowflake.generate() }),
		created_at: new Date(),
		// @ts-ignore
		recipient_ids: null
	}).save();

	await emitEvent({ event: "CHANNEL_CREATE", data: channel, guild_id: channel.guild_id } as ChannelCreateEvent);

	return channel;
}