import { useCallback, useEffect, useRef, useState } from "react";
import { fetchInboxLanes, type InboxLanes } from "@/lib/inbox-api";

/** Default poll interval. Tail-integration (T19) will replace this. */
const POLL_INTERVAL_MS = 5_000;

export function useInboxLanes() {
  const [lanes, setLanes] = useState<InboxLanes>({
    rejected: [],
    candidates: [],
    unmatched: [],
    done_today: [],
  });
  const [loading, setLoading] = useState(true);
  const [error, setError] = useState<Error | null>(null);
  const pollRef = useRef<ReturnType<typeof setInterval> | null>(null);

  const refetch = useCallback(async () => {
    try {
      const next = await fetchInboxLanes();
      setLanes(next);
      setError(null);
    } catch (e) {
      setError(e as Error);
    } finally {
      setLoading(false);
    }
  }, []);

  useEffect(() => {
    void refetch();
    pollRef.current = setInterval(() => {
      void refetch();
    }, POLL_INTERVAL_MS);
    return () => {
      if (pollRef.current) clearInterval(pollRef.current);
    };
  }, [refetch]);

  return { lanes, loading, error, refetch };
}