import { useCallback, useEffect, useState } from 'react';

import { knowledgeBaseApi } from '@/api';
import type { DimensionPolicy, KbEmbeddingProvider } from '@/api';

/**
 * Fetches the list of embedding models a user can pick at KB-creation
 * time. Server-side already filtered by the manager's
 * :class:`DimensionPolicy`; the UI just renders.
 *
 * Refetches when ``refetchTrigger`` changes (e.g. after a credential
 * was created), mirroring the contract used by other selectors.
 */
export function useKbEmbeddingModels(refetchTrigger?: number) {
	const [providers, setProviders] = useState<KbEmbeddingProvider[]>([]);
	const [policy, setPolicy] = useState<DimensionPolicy | null>(null);
	const [loading, setLoading] = useState(false);
	const [error, setError] = useState<Error | null>(null);

	const refetch = useCallback(async () => {
		setLoading(true);
		setError(null);
		try {
			const res = await knowledgeBaseApi.listEmbeddingModels();
			setProviders(res.providers);
			setPolicy(res.policy);
		} catch (e) {
			setError(e as Error);
		} finally {
			setLoading(false);
		}
	}, []);

	useEffect(() => {
		refetch();
	}, [refetch, refetchTrigger]);

	return { providers, policy, loading, error, refetch };
}