import { Router, Response, Request } from "express";
import {
	Channel,
	Config,
	emitEvent,
	getPermission,
	getRights,
	MessageDeleteBulkEvent,
	Message,
} from "@fosscord/util";
import { HTTPError } from "lambert-server";
import { route } from "@fosscord/api";

const router: Router = Router();

export default router;

// should users be able to bulk delete messages or only bots? ANSWER: all users
// should this request fail, if you provide messages older than 14 days/invalid ids? ANSWER: NO
// https://discord.com/developers/docs/resources/channel#bulk-delete-messages
router.post(
	"/",
	route({ body: "BulkDeleteSchema" }),
	async (req: Request, res: Response) => {
		const { channel_id } = req.params;
		const channel = await Channel.findOneOrFail({
			where: { id: channel_id },
		});
		if (!channel.guild_id)
			throw new HTTPError("Can't bulk delete dm channel messages", 400);

		const rights = await getRights(req.user_id);
		rights.hasThrow("SELF_DELETE_MESSAGES");

		let superuser = rights.has("MANAGE_MESSAGES");
		const permission = await getPermission(
			req.user_id,
			channel?.guild_id,
			channel_id,
		);

		const { maxBulkDelete } = Config.get().limits.message;

		const { messages } = req.body as { messages: string[] };
		if (messages.length === 0)
			throw new HTTPError("You must specify messages to bulk delete");
		if (!superuser) {
			permission.hasThrow("MANAGE_MESSAGES");
			if (messages.length > maxBulkDelete)
				throw new HTTPError(
					`You cannot delete more than ${maxBulkDelete} messages`,
				);
		}

		await Message.delete(messages);

		await emitEvent({
			event: "MESSAGE_DELETE_BULK",
			channel_id,
			data: { ids: messages, channel_id, guild_id: channel.guild_id },
		} as MessageDeleteBulkEvent);

		res.sendStatus(204);
	},
);
