import { useState, useCallback, useRef } from 'react';
import { fetchSessionId } from '../services/chatService';

export function useChatSession(apiUrl?: string) {
  const [sessionId, setSessionId] = useState('');
  const [loading, setLoading] = useState(false);
  const fetchedRef = useRef(false);

  const ensureSession = useCallback(async (): Promise<string> => {
    if (sessionId) return sessionId;
    if (fetchedRef.current) return '';
    fetchedRef.current = true;
    setLoading(true);
    try {
      const id = await fetchSessionId(apiUrl);
      setSessionId(id);
      return id;
    } catch {
      return '';
    } finally {
      setLoading(false);
    }
  }, [sessionId, apiUrl]);

  const resetSession = useCallback(() => {
    setSessionId('');
    fetchedRef.current = false;
  }, []);

  return { sessionId, loading, ensureSession, resetSession };
}