/*
	Spacebar: A FOSS re-implementation and extension of the Discord.com backend.
	Copyright (C) 2023 Spacebar and Spacebar Contributors
	
	This program is free software: you can redistribute it and/or modify
	it under the terms of the GNU Affero General Public License as published
	by the Free Software Foundation, either version 3 of the License, or
	(at your option) any later version.
	
	This program is distributed in the hope that it will be useful,
	but WITHOUT ANY WARRANTY; without even the implied warranty of
	MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
	GNU Affero General Public License for more details.
	
	You should have received a copy of the GNU Affero General Public License
	along with this program.  If not, see <https://www.gnu.org/licenses/>.
*/

import { route } from "@spacebar/api";
import {
	DiscordApiErrors,
	emitEvent,
	getPermission,
	Guild,
	Invite,
	InviteDeleteEvent,
	PublicInviteRelation,
	User,
} from "@spacebar/util";
import { Request, Response, Router } from "express";
import { HTTPError } from "lambert-server";

const router: Router = Router();

router.get(
	"/:code",
	route({
		responses: {
			"200": {
				body: "Invite",
			},
			404: {
				body: "APIErrorResponse",
			},
		},
	}),
	async (req: Request, res: Response) => {
		const { code } = req.params;

		const invite = await Invite.findOneOrFail({
			where: { code },
			relations: PublicInviteRelation,
		});

		res.status(200).send(invite);
	},
);

router.post(
	"/:code",
	route({
		right: "USE_MASS_INVITES",
		responses: {
			"200": {
				body: "Invite",
			},
			401: {
				body: "APIErrorResponse",
			},
			403: {
				body: "APIErrorResponse",
			},
			404: {
				body: "APIErrorResponse",
			},
		},
	}),
	async (req: Request, res: Response) => {
		if (req.user_bot) throw DiscordApiErrors.BOT_PROHIBITED_ENDPOINT;

		const { code } = req.params;
		const { guild_id } = await Invite.findOneOrFail({
			where: { code: code },
		});
		const { features } = await Guild.findOneOrFail({
			where: { id: guild_id },
		});
		const { public_flags } = await User.findOneOrFail({
			where: { id: req.user_id },
		});

		if (
			features.includes("INTERNAL_EMPLOYEE_ONLY") &&
			(public_flags & 1) !== 1
		)
			throw new HTTPError(
				"Only intended for the staff of this server.",
				401,
			);
		if (features.includes("INVITES_DISABLED"))
			throw new HTTPError("Sorry, this guild has joins closed.", 403);

		const invite = await Invite.joinGuild(req.user_id, code);

		res.json(invite);
	},
);

// * cant use permission of route() function because path doesn't have guild_id/channel_id
router.delete(
	"/:code",
	route({
		responses: {
			"200": {
				body: "Invite",
			},
			401: {
				body: "APIErrorResponse",
			},
			404: {
				body: "APIErrorResponse",
			},
		},
	}),
	async (req: Request, res: Response) => {
		const { code } = req.params;
		const invite = await Invite.findOneOrFail({ where: { code } });
		const { guild_id, channel_id } = invite;

		const permission = await getPermission(
			req.user_id,
			guild_id,
			channel_id,
		);

		if (
			!permission.has("MANAGE_GUILD") &&
			!permission.has("MANAGE_CHANNELS")
		)
			throw new HTTPError(
				"You missing the MANAGE_GUILD or MANAGE_CHANNELS permission",
				401,
			);

		await Promise.all([
			Invite.delete({ code }),
			emitEvent({
				event: "INVITE_DELETE",
				guild_id: guild_id,
				data: {
					channel_id: channel_id,
					guild_id: guild_id,
					code: code,
				},
			} as InviteDeleteEvent),
		]);

		res.json({ invite: invite });
	},
);

export default router;
