import { Router, Request, Response } from "express";
import { Guild, Member, Snowflake } from "@fosscord/util";
import { LessThan, IsNull } from "typeorm";
import { route } from "@fosscord/api";
const router = Router();

//Returns all inactive members, respecting role hierarchy
export const inactiveMembers = async (guild_id: string, user_id: string, days: number, roles: string[] = []) => {
	let date = new Date();
	date.setDate(date.getDate() - days);
	//Snowflake should have `generateFromTime` method? Or similar?
	let minId = BigInt(date.valueOf() - Snowflake.EPOCH) << BigInt(22);

	/**
	idea: ability to customise the cutoff variable
	possible candidates: public read receipt, last presence, last VC leave
	**/
	let members = await Member.find({
		where: [
			{
				guild_id,
				last_message_id: LessThan(minId.toString())
			},
			{
				last_message_id: IsNull()
			}
		],
		relations: ["roles"]
	});
	console.log(members);
	if (!members.length) return [];

	//I'm sure I can do this in the above db query ( and it would probably be better to do so ), but oh well.
	if (roles.length && members.length) members = members.filter((user) => user.roles?.some((role) => roles.includes(role.id)));

	const me = await Member.findOneOrFail({ where: { id: user_id, guild_id }, relations: ["roles"] });
	const myHighestRole = Math.max(...(me.roles?.map((x) => x.position) || []));

	const guild = await Guild.findOneOrFail({ where: { id: guild_id } });

	members = members.filter(
		(member) =>
			member.id !== guild.owner_id && //can't kick owner
			member.roles?.some(
				(role) =>
					role.position < myHighestRole || //roles higher than me can't be kicked
					me.id === guild.owner_id //owner can kick anyone
			)
	);

	return members;
};

router.get("/", route({}), async (req: Request, res: Response) => {
	const days = parseInt(req.query.days as string);

	let roles = req.query.include_roles;
	if (typeof roles === "string") roles = [roles]; //express will return array otherwise

	const members = await inactiveMembers(req.params.guild_id, req.user_id, days, roles as string[]);

	res.send({ pruned: members.length });
});

router.post("/", route({ permission: "KICK_MEMBERS", right: "KICK_BAN_MEMBERS" }), async (req: Request, res: Response) => {
	const days = parseInt(req.body.days);

	let roles = req.query.include_roles;
	if (typeof roles === "string") roles = [roles];

	const { guild_id } = req.params;
	const members = await inactiveMembers(guild_id, req.user_id, days, roles as string[]);

	await Promise.all(members.map((x) => Member.removeFromGuild(x.id, guild_id)));

	res.send({ purged: members.length });
});

export default router;