/*
	GoToSocial
	Copyright (C) GoToSocial Authors admin@gotosocial.org
	SPDX-License-Identifier: AGPL-3.0-or-later

	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 <http://www.gnu.org/licenses/>.
*/

import { useMemo } from "react";

import { useTextInput } from "../../../../lib/form";
import { useListEmojiQuery } from "../../../../lib/query/admin/custom-emoji";

const shortcodeRegex = /^\w{2,30}$/;

export default function useShortcode() {
	const { data: emoji = [] } = useListEmojiQuery({
		filter: "domain:local"
	});

	const emojiCodes = useMemo(() => {
		return new Set(emoji.map((e) => e.shortcode));
	}, [emoji]);

	return useTextInput("shortcode", {
		validator: function validateShortcode(code) {
			// technically invalid, but hacky fix to prevent validation error on page load
			if (code == "") { return ""; }

			if (emojiCodes.has(code)) {
				return "Shortcode already in use";
			}

			if (code.length < 2 || code.length > 30) {
				return "Shortcode must be between 2 and 30 characters";
			}

			if (!shortcodeRegex.test(code)) {
				return "Shortcode must only contain letters, numbers, and underscores";
			}

			return "";
		}
	});
}