signoz/frontend/src/container/CreateAlertV2/CreateAlertHeader/CreateAlertHeader.tsx

import './styles.scss';

import { useQueryBuilder } from 'hooks/queryBuilder/useQueryBuilder';
import { useCallback, useMemo } from 'react';
import { Labels } from 'types/api/alerts/def';

import { useCreateAlertState } from '../context';
import LabelsInput from './LabelsInput';

function CreateAlertHeader(): JSX.Element {
	const { alertState, setAlertState } = useCreateAlertState();

	const { currentQuery } = useQueryBuilder();

	const groupByLabels = useMemo(() => {
		const labels = new Array<string>();
		currentQuery.builder.queryData.forEach((query) => {
			query.groupBy.forEach((groupBy) => {
				labels.push(groupBy.key);
			});
		});
		return labels;
	}, [currentQuery]);

	// If the label key is a group by label, then it is not allowed to be used as a label key
	const validateLabelsKey = useCallback(
		(key: string): string | null => {
			if (groupByLabels.includes(key)) {
				return `Cannot use ${key} as a key`;
			}
			return null;
		},
		[groupByLabels],
	);

	return (
		<div className="alert-header">
			<div className="alert-header__tab-bar">
				<div className="alert-header__tab">New Alert Rule</div>
			</div>
			<div className="alert-header__content">
				<input
					type="text"
					value={alertState.name}
					onChange={(e): void =>
						setAlertState({ type: 'SET_ALERT_NAME', payload: e.target.value })
					}
					className="alert-header__input title"
					placeholder="Enter alert rule name"
				/>
				<LabelsInput
					labels={alertState.labels}
					onLabelsChange={(labels: Labels): void =>
						setAlertState({ type: 'SET_ALERT_LABELS', payload: labels })
					}
					validateLabelsKey={validateLabelsKey}
				/>
			</div>
		</div>
	);
}

export default CreateAlertHeader;