import { useEffect, useState } from 'react';
import { useAppSelector } from './useAppDispatch';
import { isStreamCached } from '../lib/sw';
import { getStreamUrl } from '../api/endpoints/streaming';

/**
 * Whether the given track is available from the offline audio cache (Tier 3).
 * Drives the player-bar source indicator (local vs streaming). Returns false
 * until the service worker is controlling and confirms a hit.
 */
export function useStreamCached(trackId: string | undefined): boolean {
  const token = useAppSelector((s) => s.auth.accessToken);
  const [cached, setCached] = useState(false);

  useEffect(() => {
    if (!trackId || !token) {
      setCached(false);
      return;
    }
    let active = true;
    void isStreamCached(getStreamUrl(trackId, token)).then((hit) => {
      if (active) setCached(hit);
    });
    return () => {
      active = false;
    };
  }, [trackId, token]);

  return cached;
}