import { UserGroups, UserGroupJoinings } from "@/models/index.js";
import define from "../../../define.js";
import { ApiError } from "../../../error.js";
import { getUser } from "../../../common/getters.js";

export const meta = {
	tags: ["groups", "users"],

	requireCredential: true,

	kind: "write:user-groups",

	description:
		"Removes a specified user from a group. The owner can not be removed.",

	errors: {
		noSuchGroup: {
			message: "No such group.",
			code: "NO_SUCH_GROUP",
			id: "4662487c-05b1-4b78-86e5-fd46998aba74",
		},

		noSuchUser: {
			message: "No such user.",
			code: "NO_SUCH_USER",
			id: "0b5cc374-3681-41da-861e-8bc1146f7a55",
		},

		isOwner: {
			message: "The user is the owner.",
			code: "IS_OWNER",
			id: "1546eed5-4414-4dea-81c1-b0aec4f6d2af",
		},
	},
} as const;

export const paramDef = {
	type: "object",
	properties: {
		groupId: { type: "string", format: "misskey:id" },
		userId: { type: "string", format: "misskey:id" },
	},
	required: ["groupId", "userId"],
} as const;

export default define(meta, paramDef, async (ps, me) => {
	// Fetch the group
	const userGroup = await UserGroups.findOneBy({
		id: ps.groupId,
		userId: me.id,
	});

	if (userGroup == null) {
		throw new ApiError(meta.errors.noSuchGroup);
	}

	// Fetch the user
	const user = await getUser(ps.userId).catch((e) => {
		if (e.id === "15348ddd-432d-49c2-8a5a-8069753becff")
			throw new ApiError(meta.errors.noSuchUser);
		throw e;
	});

	if (user.id === userGroup.userId) {
		throw new ApiError(meta.errors.isOwner);
	}

	// Pull the user
	await UserGroupJoinings.delete({
		userGroupId: userGroup.id,
		userId: user.id,
	});
});
